Control method and control device of wind power converter and wind power converter
阅读说明：本技术 风电变流器的控制方法、控制装置以及风电变流器 (Control method and control device of wind power converter and wind power converter ) 是由 刘佳 马忠宝 吕梁年 于 2018-06-25 设计创作，主要内容包括：本发明提供一种风电变流器的控制方法、控制装置以及风电变流器,所述控制方法包括：响应于来自风电机组的主控制器的投入命令,在第一时刻控制第一变流柜进行预充电；确定第一母线电压是否达到第一预定阈值；当确定第一母线电压达到第一预定阈值时,控制第一滤波电容投切断路器合闸；响应于所述投入命令,在晚于第一时刻的第二时刻控制第二变流柜进行预充电；确定第二母线电压是否达到第二预定阈值；当确定第二母线电压达到第二预定阈值时,控制第二滤波电容投切断路器合闸。本发明的风电变流器的控制方法、控制装置以及风电变流器,通过上述两个变流柜中的滤波电容投切断路器异步合闸,实现风电变流器的滤波电容投切保护。(The invention provides a control method and a control device of a wind power converter and the wind power converter, wherein the control method comprises the following steps: responding to an input command from a main controller of the wind turbine generator, and controlling a first converter cabinet to precharge at a first moment; determining whether the first bus voltage reaches a first predetermined threshold; when the first bus voltage is determined to reach a first preset threshold value, controlling a first filter capacitor switching circuit breaker to switch on; responding to the input command, and controlling the second converter cabinet to precharge at a second moment later than the first moment; determining whether the second bus voltage reaches a second predetermined threshold; and when the second bus voltage is determined to reach a second preset threshold value, controlling the second filter capacitor switching circuit breaker to switch on. According to the control method and the control device for the wind power converter and the wind power converter, the filter capacitors in the two converter cabinets are switched to switch the circuit breakers asynchronously, so that the filter capacitors of the wind power converter are switched to be protected.)
1. A control method of a wind power converter is characterized by comprising the following steps:
responding to an input command from a main controller of the wind turbine generator, and controlling a first converter cabinet of the wind power converter to precharge at a first moment;
determining whether a first bus voltage of a direct current bus in the first converter cabinet reaches a first predetermined threshold;
when the first bus voltage is determined to reach the first preset threshold value, controlling a first filter capacitor switching circuit breaker in the first converter cabinet to switch on;
responding to the input command, and controlling a second converter cabinet of the wind power converter to precharge at a second moment later than the first moment;
determining whether a second bus voltage of a direct current bus in the second converter cabinet reaches a second predetermined threshold;
and when the second bus voltage is determined to reach the second preset threshold value, controlling a second filter capacitor switching circuit breaker in the second converter cabinet to switch on.
2. The control method of claim 1, wherein the step of controlling a first converter cabinet of the wind power converter to precharge at a first time comprises:
controlling a first contactor in the first converter cabinet to be closed so that the power grid voltage pre-charges a power component in the first converter cabinet;
or, the step of controlling a second converter cabinet of the wind power converter to precharge at a second time later than the first time includes:
and controlling a second contactor in the second converter cabinet to be closed so that the power grid voltage pre-charges a power component in the second converter cabinet.
3. The control method according to claim 1, characterized by further comprising:
when the first bus voltage is determined to reach the first preset threshold value, controlling the first converter cabinet to stop precharging;
or, when the second bus voltage is determined to reach the second preset threshold value, controlling the second converter cabinet to stop precharging.
4. The control method of claim 1, wherein the step of controlling the closing of the first filter capacitor switching circuit breaker in the first converter cabinet comprises:
controlling a first network side circuit breaker in the first converter cabinet to switch on, so as to trigger the first filter capacitor switching circuit breaker to switch on;
or the step of controlling the second filter capacitor switching circuit breaker in the second converter cabinet to switch on comprises:
and controlling a second network side circuit breaker in the second converter cabinet to switch on, thereby triggering the second filter capacitor switching circuit breaker to switch on.
5. The control method according to claim 4, wherein the step of controlling the first filter capacitor switching circuit breaker in the first converter cabinet to be switched on further comprises:
when the first network side circuit breaker is switched on, triggering an auxiliary contact in a first switching-on loop of the first network side circuit breaker to be closed, and further triggering an auxiliary contact of a relay in the first switching-on loop to be closed, so that the first switching-on loop is conducted, and the first filter capacitor switching circuit breaker is switched on;
or, the step of controlling the second filter capacitor switching circuit breaker in the second converter cabinet to switch on further includes:
when the second network side circuit breaker is switched on, the auxiliary contact in a second switching-on loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of a relay in the second switching-on loop is triggered to be closed, so that the second switching-on loop is conducted, and the second filter capacitor switching circuit breaker is switched on.
6. The control method according to claim 1, characterized by further comprising:
and responding to a cut-off command from a main controller of the wind turbine generator, controlling the first filter capacitor switching circuit breaker to open and controlling the second filter capacitor switching circuit breaker to open.
7. The control method of claim 6, wherein the step of controlling the opening of the first filter capacitor switching circuit breaker comprises:
controlling a first network side circuit breaker in the first converter cabinet to open a brake, so as to trigger the first filter capacitor to switch the circuit breaker to open the brake;
or, the step of controlling the second filter capacitor switching circuit breaker to open the brake comprises:
and controlling a second network side circuit breaker in the second converter cabinet to open the brake, thereby triggering the second filter capacitor switching circuit breaker to open the brake.
8. The control method of claim 7, wherein the step of controlling the opening of the first filter capacitor switching circuit breaker further comprises:
when the first network side circuit breaker is switched off, triggering an auxiliary contact in a first switching-off loop of the first network side circuit breaker to be closed, further triggering an auxiliary contact of a relay in the first switching-off loop to be closed, and leading the first switching-off loop to be conducted so as to enable the first filter capacitor to switch the switching-off circuit breaker;
or, the step of controlling the second filter capacitor switching circuit breaker to open the brake further comprises:
when the second network side circuit breaker is in opening, the auxiliary contact in the second switch-off loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the second switch-off loop is triggered to be closed, so that the second switch-off loop is conducted, and the second filter capacitor is used for switching the switch-off of the circuit breaker.
9. The control method according to claim 1, characterized by further comprising:
responding to a fault signal sent out due to automatic tripping protection of the first filter capacitor switching circuit breaker, and controlling the wind power converter to stop;
or responding to a fault signal sent out due to automatic tripping protection of the second filter capacitor switching circuit breaker, and controlling the wind power converter to stop.
10. The control method according to claim 1, characterized by further comprising:
detecting the first bus voltage by a first voltage sensor in the first converter cabinet;
alternatively, the second bus voltage is detected by a second voltage sensor in the second converter cabinet.
11. A control device of a wind power converter is characterized in that the control device comprises:
the first pre-charging control module is configured to respond to an input command from a main controller of the wind turbine generator and control a first converter cabinet of the wind power converter to pre-charge at a first moment;
a first determination module configured to determine whether a first bus voltage of a direct current bus in the first converter cabinet reaches a first predetermined threshold;
a first circuit breaker control module configured to control a first filter capacitor switching circuit breaker in the first converter cabinet to switch on when it is determined that the first bus voltage reaches the first predetermined threshold;
a second pre-charging control module configured to control a second converter cabinet of the wind power converter to pre-charge at a second time later than the first time in response to the commissioning command;
a second determination module configured to determine whether a second bus voltage of the dc bus in the second converter cabinet reaches a second predetermined threshold;
and the second circuit breaker control module is configured to control a second filter capacitor switching circuit breaker in the second converter cabinet to be switched on when the second bus voltage is determined to reach the second predetermined threshold value.
12. The control device of claim 11,
the first precharge control module is further configured to: controlling a first contactor in the first converter cabinet to be closed so that the power grid voltage pre-charges a power component in the first converter cabinet;
the second precharge control module is further configured to: and controlling a second contactor in the second converter cabinet to be closed so that the power grid voltage pre-charges a power component in the second converter cabinet.
13. The control device of claim 11,
the first precharge control module is further configured to: when the first bus voltage is determined to reach the first preset threshold value, controlling the first converter cabinet to stop precharging;
the second precharge control module is further configured to: and when the second bus voltage is determined to reach the second preset threshold value, controlling the second converter cabinet to stop precharging.
14. The control device of claim 11,
the first circuit breaker control module is further configured to: controlling a first network side circuit breaker in the first converter cabinet to switch on, so as to trigger the first filter capacitor switching circuit breaker to switch on;
the second circuit breaker control module is further configured to: and controlling a second network side circuit breaker in the second converter cabinet to switch on, thereby triggering the second filter capacitor switching circuit breaker to switch on.
15. The control device of claim 14,
when a first circuit breaker control module controls the first network side circuit breaker to switch on, triggering an auxiliary contact in a first switching-on loop of the first network side circuit breaker to be closed, and further triggering an auxiliary contact of a relay in the first switching-on loop to be closed, so that the first switching-on loop is conducted, and the first filter capacitor switches on the circuit breaker to switch on;
when the second circuit breaker control module switches on the second network side circuit breaker, the auxiliary contact in a second switching-on loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of a relay in the second switching-on loop is triggered to be closed, so that the second switching-on loop is switched on, and the second filter capacitor switches on the circuit breaker.
16. The control device of claim 11,
the first circuit breaker control module is further configured to: responding to a cut-off command from a main controller of the wind turbine generator, and controlling the first filter capacitor switching circuit breaker to open;
the second circuit breaker control module is further configured to: and responding to a cut-off command from a main controller of the wind turbine generator, and controlling the second filter capacitor switching circuit breaker to open.
17. The control apparatus of claim 16, wherein the first circuit breaker control module is further configured to: controlling a first network side circuit breaker in the first converter cabinet to open a brake, so as to trigger the first filter capacitor to switch the circuit breaker to open the brake;
the second circuit breaker control module is further configured to: and controlling a second network side circuit breaker in the second converter cabinet to open the brake, thereby triggering the second filter capacitor switching circuit breaker to open the brake.
18. The control device of claim 17,
when the first circuit breaker control module controls the first network side circuit breaker to open, an auxiliary contact in a first brake opening loop of the first network side circuit breaker is triggered to be closed, and then an auxiliary contact of a relay in the first brake opening loop is triggered to be closed, so that the first brake opening loop is conducted, and the first filter capacitor switches the circuit breaker to open;
when the second circuit breaker control module controls the second grid side circuit breaker to be opened, the auxiliary contact in the second switch-off loop of the second grid side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the second switch-off loop is triggered to be closed, so that the second switch-off loop is conducted, and the second filter capacitor is used for switching the switch-off of the circuit breaker.
19. The control device according to claim 11, characterized in that the control device further comprises:
the control module is configured to respond to a fault signal sent out due to automatic tripping protection of the first filter capacitor switching circuit breaker and control the wind power converter to stop; or responding to a fault signal sent out due to automatic tripping protection of the second filter capacitor switching circuit breaker, and controlling the wind power converter to stop.
20. The control device of claim 11,
the first bus voltage is detected by a first voltage sensor in the first converter cabinet;
the second bus voltage is detected by a second voltage sensor in the second converter cabinet.
21. Wind power converter, characterized in that it comprises a control device of a wind power converter according to any of claims 11 to 20.
Technical Field
The present invention generally relates to the field of wind power technologies, and in particular, to a control method and a control device for a wind power converter, and a wind power converter.
Background
The wind power converter is one of core components of the wind power generation system, can optimize the operation of the wind power generation system and improve the utilization rate of wind energy. Generally, a wind power converter comprises a main cabinet and a slave cabinet with completely identical main circuits, wherein both the main cabinet and the slave cabinet are provided with filter capacitor switching circuit breakers, and energy is required for switching on the filter capacitor switching circuit breakers.
The existing wind power converter generally adopts the following two modes for providing energy for a filter capacitor switching circuit breaker: (1) an Uninterruptible Power Supply (UPS) is used for providing electric energy for the filter capacitor switching circuit breaker. However, the power of the existing uninterruptible power supply is difficult to simultaneously start the filter capacitor switching circuit breakers in the master cabinet and the slave cabinet. Taking the existing 2.5MW wind power converter as an example, the wind power converter simultaneously starts two filter capacitor switching circuit breakers with 1800 vars of power by using an Uninterruptible Power Supply (UPS) with 2000 vars of power, which easily causes that the two filter capacitor switching circuit breakers cannot normally switch on; (2) and the power supply in the wind power converter supplies electric energy to the filter capacitor switching circuit breakers in the main cabinet and the slave cabinet at the same time. However, when complex working conditions such as low voltage ride through occur, the filter capacitor switching circuit breakers in the master cabinet and the slave cabinet cannot be normally switched on.
Disclosure of Invention
The invention aims to provide a control method and a control device of a wind power converter and the wind power converter.
One aspect of the present invention provides a control method for a wind power converter, including: responding to an input command from a main controller of the wind turbine generator, and controlling a first converter cabinet of the wind power converter to precharge at a first moment; determining whether a first bus voltage of a direct current bus in the first converter cabinet reaches a first predetermined threshold; when the first bus voltage is determined to reach the first preset threshold value, controlling a first filter capacitor switching circuit breaker in the first converter cabinet to switch on; responding to the input command, and controlling a second converter cabinet of the wind power converter to precharge at a second moment later than the first moment; determining whether a second bus voltage of a direct current bus in the second converter cabinet reaches a second predetermined threshold; and when the second bus voltage is determined to reach the second preset threshold value, controlling a second filter capacitor switching circuit breaker in the second converter cabinet to switch on.
Optionally, the step of controlling the first converter cabinet of the wind power converter to precharge at the first time includes: controlling a first contactor in the first converter cabinet to be closed so that the power grid voltage pre-charges a power component in the first converter cabinet; or, the step of controlling a second converter cabinet of the wind power converter to precharge at a second time later than the first time includes: and controlling a second contactor in the second converter cabinet to be closed so that the power grid voltage pre-charges a power component in the second converter cabinet.
Optionally, the control method further includes: when the first bus voltage is determined to reach the first preset threshold value, controlling the first converter cabinet to stop precharging; or, when the second bus voltage is determined to reach the second preset threshold value, controlling the second converter cabinet to stop precharging.
Optionally, the step of controlling a first filter capacitor switching circuit breaker in the first converter cabinet to switch on includes: controlling a first network side circuit breaker in the first converter cabinet to switch on, so as to trigger the first filter capacitor switching circuit breaker to switch on; or the step of controlling the second filter capacitor switching circuit breaker in the second converter cabinet to switch on comprises: and controlling a second network side circuit breaker in the second converter cabinet to switch on, thereby triggering the second filter capacitor switching circuit breaker to switch on.
Optionally, the step of controlling a first filter capacitor switching circuit breaker in the first converter cabinet to switch on further includes: when the first network side circuit breaker is switched on, triggering an auxiliary contact in a first switching-on loop of the first network side circuit breaker to be closed, and further triggering an auxiliary contact of a relay in the first switching-on loop to be closed, so that the first switching-on loop is conducted, and the first filter capacitor switching circuit breaker is switched on; or, the step of controlling the second filter capacitor switching circuit breaker in the second converter cabinet to switch on further includes: when the second network side circuit breaker is switched on, the auxiliary contact in a second switching-on loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of a relay in the second switching-on loop is triggered to be closed, so that the second switching-on loop is conducted, and the second filter capacitor switching circuit breaker is switched on.
Optionally, the control method further includes: and responding to a cut-off command from a main controller of the wind turbine generator, controlling the first filter capacitor switching circuit breaker to open and controlling the second filter capacitor switching circuit breaker to open.
Optionally, the step of controlling the first filter capacitor switching circuit breaker to open the brake includes: controlling a first network side circuit breaker in the first converter cabinet to open a brake, so as to trigger the first filter capacitor to switch the circuit breaker to open the brake; or, the step of controlling the second filter capacitor switching circuit breaker to open the brake comprises: and controlling a second network side circuit breaker in the second converter cabinet to open the brake, thereby triggering the second filter capacitor switching circuit breaker to open the brake.
Optionally, the step of controlling the first filter capacitor switching circuit breaker to open the brake further includes: when the first network side circuit breaker is switched off, triggering an auxiliary contact in a first switching-off loop of the first network side circuit breaker to be closed, further triggering an auxiliary contact of a relay in the first switching-off loop to be closed, and leading the first switching-off loop to be conducted so as to enable the first filter capacitor to switch the switching-off circuit breaker; or, the step of controlling the second filter capacitor switching circuit breaker to open the brake further comprises: when the second network side circuit breaker is in opening, the auxiliary contact in the second switch-off loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the second switch-off loop is triggered to be closed, so that the second switch-off loop is conducted, and the second filter capacitor is used for switching the switch-off of the circuit breaker.
Optionally, the control method further includes: responding to a fault signal sent out due to automatic tripping protection of the first filter capacitor switching circuit breaker, and controlling the wind power converter to stop; or responding to a fault signal sent out due to automatic tripping protection of the second filter capacitor switching circuit breaker, and controlling the wind power converter to stop.
Optionally, the control method further includes: detecting the first bus voltage by a first voltage sensor in the first converter cabinet; alternatively, the second bus voltage is detected by a second voltage sensor in the second converter cabinet.
Another aspect of the present invention also provides a control apparatus for a wind power converter, the control apparatus comprising: the first pre-charging control module is configured to respond to an input command from a main controller of the wind turbine generator and control a first converter cabinet of the wind power converter to pre-charge at a first moment; a first determination module configured to determine whether a first bus voltage of a direct current bus in the first converter cabinet reaches a first predetermined threshold; a first circuit breaker control module configured to control a first filter capacitor switching circuit breaker in the first converter cabinet to switch on when it is determined that the first bus voltage reaches the first predetermined threshold; a second pre-charging control module configured to control a second converter cabinet of the wind power converter to pre-charge at a second time later than the first time in response to the commissioning command; a second determination module configured to determine whether a second bus voltage of the dc bus in the second converter cabinet reaches a second predetermined threshold; and the second circuit breaker control module is configured to control a second filter capacitor switching circuit breaker in the second converter cabinet to be switched on when the second bus voltage is determined to reach the second predetermined threshold value.
Optionally, the first precharge control module is further configured to: controlling a first contactor in the first converter cabinet to be closed so that the power grid voltage pre-charges a power component in the first converter cabinet; the second precharge control module is further configured to: and controlling a second contactor in the second converter cabinet to be closed so that the power grid voltage pre-charges a power component in the second converter cabinet.
Optionally, the first precharge control module is further configured to: when the first bus voltage is determined to reach the first preset threshold value, controlling the first converter cabinet to stop precharging; the second precharge control module is further configured to: and when the second bus voltage is determined to reach the second preset threshold value, controlling the second converter cabinet to stop precharging.
Optionally, the first circuit breaker control module is further configured to: controlling a first network side circuit breaker in the first converter cabinet to switch on, so as to trigger the first filter capacitor switching circuit breaker to switch on; the second circuit breaker control module is further configured to: and controlling a second network side circuit breaker in the second converter cabinet to switch on, thereby triggering the second filter capacitor switching circuit breaker to switch on.
Optionally, when a first circuit breaker control module controls the first network side circuit breaker to switch on, triggering an auxiliary contact in a first switching-on loop of the first network side circuit breaker to be closed, and further triggering an auxiliary contact of a relay in the first switching-on loop to be closed, so that the first switching-on loop is conducted, and the first filter capacitor switching circuit breaker is switched on; when the second circuit breaker control module controls the second network side circuit breaker to be switched on, the auxiliary contact in a second switching-on loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of a relay in the second switching-on loop is triggered to be closed, so that the second switching-on loop is switched on, and the second filter capacitor is switched on and switched off to switch on the circuit breaker.
Optionally, the first circuit breaker control module is further configured to: responding to a cut-off command from a main controller of the wind turbine generator, and controlling the first filter capacitor switching circuit breaker to open; the second circuit breaker control module is further configured to: and responding to a cut-off command from a main controller of the wind turbine generator, and controlling the second filter capacitor switching circuit breaker to open.
Optionally, the first circuit breaker control module is further configured to: controlling a first network side circuit breaker in the first converter cabinet to open a brake, so as to trigger the first filter capacitor to switch the circuit breaker to open the brake; the second circuit breaker control module is further configured to: and controlling a second network side circuit breaker in the second converter cabinet to open the brake, thereby triggering the second filter capacitor switching circuit breaker to open the brake.
Optionally, when the first network-side circuit breaker control module controls the first network-side circuit breaker to open, the auxiliary contact in the first switching loop of the first network-side circuit breaker is triggered to close, and then the auxiliary contact of the relay in the first switching loop is triggered to close, so that the first switching loop is conducted, and the first filter capacitor switches the circuit breaker to open; when the second circuit breaker control module controls the second grid side circuit breaker to be opened, the auxiliary contact in the second switch-off loop of the second grid side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the second switch-off loop is triggered to be closed, so that the second switch-off loop is conducted, and the second filter capacitor is used for switching the switch-off of the circuit breaker.
Optionally, the control device further comprises: the control module is configured to respond to a fault signal sent out due to automatic tripping protection of the first filter capacitor switching circuit breaker and control the wind power converter to stop; or responding to a fault signal sent out due to automatic tripping protection of the second filter capacitor switching circuit breaker, and controlling the wind power converter to stop.
Optionally, the first bus voltage is detected by a first voltage sensor in the first converter cabinet; the second bus voltage is detected by a second voltage sensor in the second converter cabinet.
The invention also provides a wind power converter, which comprises the control device of the wind power converter.
According to the control method and the control device for the wind power converter and the wind power converter, the filter capacitor switching circuit breaker in the first converter cabinet and the filter capacitor switching circuit breaker in the second converter cabinet are asynchronously switched on through signal delay between the first converter cabinet and the second converter cabinet, and switching protection of the wind power converter is achieved. In addition, the filter capacitor switching circuit breakers in the first converter cabinet and the second converter cabinet are switched on asynchronously, so that the impact on the uninterruptible power supply at the moment of starting the electric operation of the filter capacitor switching circuit breakers can be reduced, and the reliability of the uninterruptible power supply is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a flow chart of a control method of a wind power converter according to an embodiment of the invention;
FIG. 2 shows a control block diagram of a wind power converter according to an embodiment of the invention;
fig. 3 shows a schematic circuit diagram of a first converter cabinet of a wind power converter according to an embodiment of the invention;
figure 4 shows a first filter capacitor switching circuit breaker control schematic according to an embodiment of the invention;
fig. 5 shows a block diagram of a control device of a wind power converter according to an embodiment of the invention.
Detailed Description
Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.
A control method and a control apparatus of a wind power converter according to an embodiment of the present invention are described below with reference to fig. 1 to 5.
Fig. 1 shows a flow chart of a control method of a wind power converter according to an embodiment of the invention.
In step S10, a first converter cabinet of the wind power converter is controlled to be precharged at a first time in response to an input command from a main controller of the wind turbine.
As an example, the switch-in command from the main controller of the wind turbine may be a start command indicating a switch-in of a filter capacitor of the wind power converter.
In step S12, it is determined whether the first bus voltage of the dc bus in the first converter cabinet reaches a first predetermined threshold.
The first predetermined threshold may be predetermined as desired. As an example, the first predetermined threshold may be 970 volts.
In step S14, when it is determined that the first bus voltage reaches the first predetermined threshold, a first filter capacitor switching circuit breaker in the first converter cabinet is controlled to be switched on.
As an example, the first filter capacitor switching circuit breaker may be a T3 circuit breaker, which T3 circuit breaker is a circuit breaker capable of achieving a frame current of 250 amps at a depth of 70 millimeters.
In addition, the control method may further include: and controlling the first converter cabinet to stop precharging when the first bus voltage is determined to reach the first preset threshold value.
In step S20, in response to the input command, a second converter cabinet of the wind power converter is controlled to precharge at a second time later than the first time.
That is, the second converter cabinet is precharged after the first converter cabinet is precharged for a predetermined time.
The time interval (i.e., the time difference) between the first time and the second time may be preset as needed, but the present invention is not limited thereto. As an example, the second time is 3 seconds later than the first time, and a time interval of 3 seconds can ensure that the first filter capacitor switching circuit breaker in the first converter cabinet is closed completely.
As an example, the first converter cabinet may be a master cabinet, and the second converter cabinet may be a slave cabinet; alternatively, the first converter cabinet may be a slave cabinet and the second converter cabinet may be a master cabinet.
In one embodiment of step S20, the second contactor in the second converter cabinet is controlled to close, so that the grid voltage precharges the power components in the second converter cabinet.
In step S22, it is determined whether the second bus voltage of the dc bus in the second converter cabinet reaches a second predetermined threshold.
As an example, the second bus voltage may be detected by a second voltage sensor in the second converter cabinet.
The second predetermined threshold may be predetermined as desired. As an example, the second predetermined threshold may be 970 volts.
In step S24, when it is determined that the second bus voltage reaches the second predetermined threshold, a second filter capacitor switching circuit breaker in the second converter cabinet is controlled to be switched on.
In one embodiment of step S24, a second network-side circuit breaker in the second converter cabinet is controlled to close, so as to trigger the second filter capacitor switching circuit breaker to close.
Preferably, a second network-side circuit breaker in a second converter cabinet is controlled to be switched on, so that the second filter capacitor switching circuit breaker is triggered to be switched on through a second electric operator, and filter capacitor input in the second converter cabinet of the wind power converter is achieved.
When the second network side circuit breaker is switched on, the auxiliary contact in the second switching-on loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the second switching-on loop is triggered to be closed, so that the second switching-on loop is conducted, and the second filter capacitor switching circuit breaker is switched on.
Preferably, when the second closing loop is turned on, the second electrically operated auxiliary contact is triggered to be closed, so that the second filter capacitor switching circuit breaker is closed.
In addition, the control method may further include: and controlling the second converter cabinet to stop precharging when the second bus voltage is determined to reach the second preset threshold value.
As an example, the second contactor in the second converter cabinet is controlled to open, so that the grid voltage stops precharging the power components in the second converter cabinet.
Fig. 2 shows an example of a control block diagram of a wind power converter according to an embodiment of the invention.
As an example, referring to fig. 2, an input command from a main controller of the wind turbine may be received by the
In addition, the
An example of a control method of a wind power converter according to an embodiment of the present invention is described in detail below with reference to fig. 3.
Fig. 3 shows a schematic circuit diagram of a first converter cabinet of a wind power converter according to an embodiment of the invention.
Referring to fig. 3, in one embodiment of step S10, in response to a commissioning command from the main controller of the wind turbine, the
Preferably, the grid voltage may precharge the power components 104 in the first converter cabinet through the
As an example, the power components in the first converter cabinet may include bus bar support capacitors, Insulated Gate Bipolar Transistors (IGBTs), heat sinks, and the like.
In one embodiment of step S12, the first bus voltage may be detected by a first voltage sensor in the first converter cabinet.
In one embodiment of step S14, when it is determined that the first bus voltage reaches the first predetermined threshold, the first network-
Preferably, the first network-
Preferably, the first grid-
The first electrical operation may be an operating mechanism that performs automatic manipulation and remote control through the auxiliary contacts.
Fig. 4 shows a first filter capacitor switching circuit breaker control schematic according to an embodiment of the invention.
Referring to FIG. 4, L1Is a live wire, N1Is a zero line. When the first grid-
Preferably, the first electrically operated auxiliary contact Q is triggered when the first closing circuit is switched on4And closing, so that the first filter capacitor
Further, as an example, the control method may further include: the
Preferably, the
According to the embodiment, the filter capacitor switching circuit breakers in the first converter cabinet and the second converter cabinet are asynchronously switched on through the pre-charging delay between the first converter cabinet and the second converter cabinet, so that the inrush current generated when the filter capacitor of the wind power converter is switched on is effectively reduced, the switching protection of the wind power converter is realized, the impact of the electric operation on the uninterruptible power supply in the moment of starting the electric operation is reduced, and the reliability of the uninterruptible power supply is improved.
In addition, the control method of the wind power converter may further include: and responding to a cut-off command from a main controller of the wind turbine generator, controlling the first filter capacitor switching circuit breaker to open and controlling the second filter capacitor switching circuit breaker to open.
The first filter capacitor switching circuit breaker and the second filter capacitor switching circuit breaker can be synchronously switched off or asynchronously switched off, and the invention is not particularly limited to this.
One example of "controlling the opening of the first filter capacitor switching breaker" is described in detail below.
Returning to fig. 3, as an example, in response to the cut command, the first network-side cut-off 106 in the first converter cabinet is controlled to open, thereby triggering the first filter
Returning to fig. 4, when the first grid-
In addition, the control method of the wind power converter may further include: and controlling the wind power converter to stop in response to a fault signal sent out due to automatic tripping protection of the first filter capacitor
It should be appreciated that when the first filter capacitor
An example of "controlling the opening of the second filter capacitor switching breaker" is described in detail below.
As an example, in response to the cut-off command, a second grid-side circuit breaker in the second converter cabinet is controlled to open, thereby triggering the second filter capacitor switching circuit breaker to open.
When the second network side circuit breaker is in brake-off, the auxiliary contact in the second brake-off loop of the second network side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the second brake-off loop is triggered to be closed, so that the second brake-off loop is conducted, and the second filter capacitor is used for switching the brake-off of the circuit breaker.
In addition, the control method of the wind power converter may further include: and controlling the wind power converter to stop in response to a fault signal sent out due to automatic tripping protection of the second filter capacitor switching circuit breaker.
A control apparatus of a wind power converter according to an embodiment of the present invention is described below with reference to fig. 5.
Fig. 5 shows a block diagram of a control device of a wind power converter according to an embodiment of the invention.
Referring to fig. 5, the
The first pre-charging control module 300 controls a first converter cabinet of the wind power converter to pre-charge at a first time in response to an input command from a main controller of the wind turbine.
As an example, the first pre-charge control module 300 controls a first contactor in the first converter cabinet to close in response to a commissioning command from a master controller of the wind turbine to cause the grid voltage to pre-charge power components in the first converter cabinet.
By way of example, the power components in the first converter cabinet may include bus bar support capacitors, insulated gate bipolar transistors, heat sinks, and the like.
The first determination module 302 determines whether a first bus voltage of a dc bus in a first converter cabinet reaches a first predetermined threshold.
The first predetermined threshold may be predetermined as desired. As an example, the first predetermined threshold may be 970 volts.
The first circuit breaker control module 304 controls a first filter capacitor switching circuit breaker in the first converter cabinet to switch on when it is determined that the first bus voltage reaches a first predetermined threshold.
Preferably, the first circuit breaker control module 304 may control the first filter capacitor switching circuit breaker to switch on by controlling a first network side controller in the first converter cabinet when it is determined that the first bus voltage reaches the first predetermined threshold.
As an example, the first filter capacitor switching breaker may be a T3 breaker.
As an example, the first circuit breaker control module 304 controls a first network-side circuit breaker in the first converter cabinet to close when it is determined that the first bus voltage reaches a first predetermined threshold, thereby triggering the first filter capacitor switching circuit breaker to close.
Preferably, the first network-side circuit breaker can be controlled to be switched on by controlling the first network-side controller in the first converter cabinet, so that the first filter capacitor switching circuit breaker is triggered to be switched on.
Preferably, the first circuit breaker control module 304 controls a first network-side circuit breaker in the first converter cabinet to switch on, so that the first filter capacitor switching circuit breaker is triggered to switch on through a first electric operation, and the filter capacitor in the first converter cabinet of the wind power converter is switched on.
The first electric operation can be an operation mechanism which is automatically controlled and remotely controlled through an auxiliary contact.
For example, when a first network-side circuit breaker is switched on, the first circuit breaker control module 304 triggers an auxiliary contact in a first switching-on loop of the first network-side circuit breaker to be closed, and further triggers an auxiliary contact of a relay in the first switching-on loop to be closed, so that the first switching-on loop is turned on, and the first filter capacitor switching circuit breaker is switched on.
In addition, the first precharge control module 300 controls the first converter cabinet to stop precharging when it is determined that the first bus voltage reaches the first predetermined threshold.
Furthermore, the first bus voltage may be detected by a first voltage sensor in the first converter cabinet.
The second pre-charging control module 400 controls a second converter cabinet of the wind power converter to pre-charge at a second time later than the first time in response to the input command.
The time interval between the first time and the second time can be preset according to the need, which is not limited by the present invention. As an example, the second time is 3 seconds later than the first time, and the 3 second time interval can ensure that the first filter capacitor switching circuit breaker in the first converter cabinet is closed completely.
As an example, the second pre-charge control module 400 controls a second contactor in the second converter cabinet to close so that the grid voltage pre-charges the power components in the second converter cabinet.
As an example, the first converter cabinet may be a master cabinet, and the second converter cabinet may be a slave cabinet; alternatively, the first converter cabinet may be a slave cabinet and the second converter cabinet may be a master cabinet.
Preferably, the first and second precharge control modules 300 and 400 may be integrated into an inverter PLC, but the present invention is not limited thereto.
A
The second predetermined threshold may be predetermined as desired. As an example, the second predetermined threshold may be 970 volts.
And when determining that the second bus voltage reaches a second predetermined threshold value, the second circuit breaker control module 404 controls a second filter capacitor switching circuit breaker in the second converter cabinet to switch on.
Preferably, the second circuit breaker control module 404 may control the second filter capacitor switching circuit breaker to switch on by controlling a second network side controller in the second converter cabinet when it is determined that the second bus voltage reaches the second predetermined threshold.
As an example, the second circuit breaker control module 404 controls a second network-side circuit breaker in the second converter cabinet to close, thereby triggering the second filter capacitor switching circuit breaker to close.
Preferably, the second network-side circuit breaker can be controlled to be switched on by controlling a second network-side controller in the second converter cabinet, so that the second filter capacitor switching circuit breaker is triggered to be switched on.
Preferably, the second circuit breaker control module 404 controls a second network-side circuit breaker in the second converter cabinet to switch on, so that the second filter capacitor switching circuit breaker is triggered to switch on through a second electric operation, and the filter capacitor in the second converter cabinet of the wind power converter is switched on.
When the second grid-side circuit breaker is switched on, the second circuit breaker control module 404 triggers the auxiliary contact in the second switching-on loop of the second grid-side circuit breaker to be closed, and further triggers the auxiliary contact of the relay in the second switching-on loop to be closed, so that the second switching-on loop is switched on, and the second filter capacitor is switched on and off.
In addition, the second precharge control module 400 controls the second converter cabinet to stop precharging when it is determined that the second bus voltage reaches a second predetermined threshold.
As an example, the second pre-charge control module 400 controls the second contactor in the second converter cabinet to open, so that the grid voltage stops pre-charging the power components in the second converter cabinet.
In addition, the second bus voltage may be detected by a second voltage sensor in the second converter cabinet.
The following describes in detail a process of the first circuit breaker control module controlling the first filter capacitor switching circuit breaker to open the brake.
The first circuit breaker control module 304 controls the first filter capacitor switching circuit breaker to open in response to a cut-off command from a main controller of the wind turbine.
As an example, the first circuit breaker control module 304 controls a first net-side breaking open-brake in the first converter cabinet in response to the cut-off command, thereby triggering the first filter capacitor switching circuit breaker open-brake.
When the first circuit breaker control module 304 controls the first grid-side circuit breaker to open, the auxiliary contact in the first switching loop of the first grid-side circuit breaker is triggered to be closed, and then the auxiliary contact of the relay in the first switching loop is triggered to be closed, so that the first switching loop is conducted, and the first filter capacitor switches the circuit breaker to open.
In addition, the first circuit breaker control module 304 may further control the wind power converter to stop in response to a fault signal issued due to the first filter capacitor switching circuit breaker automatic trip protection.
The process of the second circuit breaker control module controlling the second filter capacitor switching circuit breaker to open the brake is described in detail below.
The second circuit breaker control module 404 controls the second filter capacitor switching circuit breaker to open in response to a cut-off command from a main controller of the wind turbine.
As an example, the second circuit breaker control module 404 controls the second grid-side circuit breaker in the second converter cabinet to open in response to the cut command, thereby triggering the second filter capacitor switching circuit breaker to open.
When the second circuit breaker control module 404 controls the second grid-side circuit breaker to open, the auxiliary contact in the second shunt circuit of the second grid-side circuit breaker is triggered to close, and then the auxiliary contact of the relay in the second shunt circuit is triggered to close, so that the second shunt circuit is conducted, and the second filter capacitor switches the circuit breaker to open.
In addition, the second circuit breaker control module 404 may further control the wind power converter to stop in response to a fault signal issued due to the second filter capacitor switching circuit breaker automatic trip protection.
It should be understood that the first filter capacitor switching circuit breaker and the second filter capacitor switching circuit breaker may be switched off synchronously or asynchronously, and the present invention is not limited thereto.
Furthermore, according to an embodiment of the present invention, a wind power converter is provided, which includes the
In addition, according to the control method and the control device for the wind power converter and the wind power converter provided by the embodiment of the invention, the filter capacitor switching circuit breakers in the first converter cabinet and the second converter cabinet are asynchronously switched on through signal delay between the first converter cabinet and the second converter cabinet, so that switching protection of the wind power converter is realized. In addition, the filter capacitor switching circuit breaker in the first converter cabinet and the filter capacitor switching circuit breaker in the second converter cabinet are switched on asynchronously, so that the impact on the uninterruptible power supply at the moment of starting the filter capacitor switching circuit breakers can be reduced, and the reliability of the uninterruptible power supply is improved.
Furthermore, it should be understood that the respective modules in the control apparatus of the wind power converter according to the exemplary embodiment of the present invention may be implemented as hardware components and/or software components. Those skilled in the art may implement the various modules using, for example, Field Programmable Gate Arrays (FPGAs) or Application Specific Integrated Circuits (ASICs), depending on the processing performed by the defined various modules.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
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