Control system and control method for power supply in ring main unit

文档序号：1849177 发布日期：2021-11-16 浏览：11次中文

阅读说明：本技术 一种环网柜内供电电源的控制系统及控制方法 (Control system and control method for power supply in ring main unit ) 是由刘涛刘俊峰谢学刚张忠才徐万长张春丽李岚田小航于 2021-08-16 设计创作，主要内容包括：本申请涉及电力配电设备技术领域,提供一种环网柜内供电电源的控制系统及控制方法,该控制系统包括储能装置、主回路开关、联络回路开关和测控装置,利用测控装置监测供电绕组和储能绕组状态信息,根据状态信息输出控制信号,主回路开关和联络回路开关上设置有控制元件,利用控制元件接收控制信号以控制开关开合,储能装置包括双向功率变换器,双向功率变换器上设置有控制端口,利用控制端口接收控制信号以切换双向功率变换器充电和供电模式。该系统及方法利用测控装置实时监测,并根据监测结果自动切换供电电源内的开关,当绕组发生故障时切换至其他正常绕组供电,当停电故障时由储能装置应急供电,保证环网柜供电电源的供电可靠性。(The utility model relates to an electric power distribution equipment technical field provides a control system and control method of power supply in looped netowrk cabinet, this control system includes energy memory, main loop switch, contact loop switch and measurement and control device, utilize measurement and control device monitoring power supply winding and energy storage winding state information, according to state information output control signal, be provided with control element on main loop switch and the contact loop switch, utilize control element to receive control signal and open and close with control switch, energy memory includes two-way power converter, be provided with the control port on the two-way power converter, utilize the control port to receive control signal and charge and the power supply mode with switching two-way power converter. The system and the method utilize the measurement and control device for real-time monitoring, automatically switch a switch in the power supply according to a monitoring result, switch to other normal windings for power supply when the winding has a fault, and supply power by the energy storage device in an emergency manner when the winding has a power failure fault, thereby ensuring the power supply reliability of the power supply of the ring main unit.)

1. A control system of a power supply in a ring main unit is characterized by comprising an energy storage device, a main loop switch, a communication loop switch and a measurement and control device;

the energy storage device is connected with the energy storage winding and used for receiving power distribution of the energy storage winding;

the energy storage device is connected with the adjacent power supply modules;

the plurality of main loop switches are respectively arranged on a connecting wire of the power supply winding and the power supply module and on a connecting wire of the energy storage device and the energy storage winding;

the plurality of interconnection loop switches are respectively arranged on connecting lines between adjacent power supply modules and on connecting lines between the adjacent power supply modules and the energy storage device;

the measurement and control device comprises a voltage end and a control signal end, wherein the voltage end is connected with the energy storage winding and all the power supply windings and is used for monitoring the state information of each group of power supply winding and energy storage winding, and the control signal end is used for outputting a control signal according to the state information;

the energy storage device comprises a bidirectional power converter, a control port is arranged on the bidirectional power converter, and the control port is connected with a control signal end of the measurement and control device and used for receiving the control signal so as to switch the charging and power supply modes of the bidirectional power converter according to the control signal;

the main loop switch and the interconnection loop switch are provided with control elements, and the control elements are connected with the control signal ends of the measurement and control devices and used for receiving the control signals so as to control the switches to be opened and closed according to the control signals.

2. The control system of the power supply source in the ring main unit according to claim 1, wherein the main loop switch and the interconnection loop switch are both metal oxide semiconductor field effect transistors, and the control signal terminal is connected to a G electrode of the metal oxide semiconductor field effect transistor.

3. The control system of the power supply source in the ring main unit according to claim 1, further comprising a locking device and a display device;

the measurement and control device further comprises a data end, wherein the data end is connected with the locking device and the display device and is used for transmitting state information data monitored by the voltage end and opening and closing information of a main loop switch and a contact loop switch which are connected with the control signal end;

the blocking device comprises an electrical block arranged between the main circuit switch and the interconnection circuit switch;

the display device comprises a display screen and an operation button, the display screen is used for displaying the state information data and the opening and closing information, and the operation button is used for displaying and switching.

4. The control system of a power supply source in a ring main unit according to claim 1, wherein the energy storage device further includes an energy storage battery and a super capacitor, and the energy storage battery and the super capacitor are connected in parallel between the bidirectional power converter and ground.

5. A control method for a power supply in a ring main unit is applied to the control system for the power supply in the ring main unit according to any one of claims 1 to 5, and the control method comprises the following steps:

monitoring the state information of each group of power supply windings and energy storage windings in real time through a measurement and control device, wherein the state information comprises the current voltages of the power supply windings and the energy storage windings;

acquiring the current voltage and the rated voltage of each group of power supply winding and energy storage winding, and judging whether the power supply winding or the energy storage winding has a fault according to the current voltage and the rated voltage;

if all the power supply windings and the energy storage windings run normally, the measurement and control device sends out control signals to control the closing of each main loop switch, the opening of each interconnection loop switch and the operation of the bidirectional power converter of the energy storage device in a charging mode;

if any power supply winding or energy storage winding has a fault, the measurement and control device sends a control signal to disconnect the power supply winding or the energy storage winding with the fault from the main loop switch and switch on any adjacent interconnection loop switch of the power supply winding or the energy storage winding with the fault;

if all the power supply windings and the energy storage windings are in fault, the measurement and control device sends out control signals to disconnect all the main loop switches, then sequentially switch on all the interconnection loop switches, and control the bidirectional power converter of the energy storage device to operate in a power supply mode.

6. The method for controlling the power supply in the ring main unit according to claim 5, wherein the step of obtaining the current voltage and the rated voltage of each group of the power supply winding and the energy storage winding and judging whether the power supply winding or the energy storage winding has a fault according to the current voltage and the rated voltage comprises:

and if the current voltage of the power supply winding or the energy storage winding is between 80% and 120% of the rated voltage, judging that the power supply winding or the energy storage winding normally operates, and if the current voltage of the power supply winding or the energy storage winding is lower than 80% of the rated voltage or higher than 120% of the rated voltage, judging that the power supply winding or the energy storage winding has a fault.

7. The method for controlling the power supply in the ring main unit according to claim 5, further comprising:

transmitting the voltage and the current of the power supply winding and the energy storage winding and the on-off information of each switch to a display device by using a data end of the measurement and control device, and visually displaying through a display screen of the display device; if the power supply winding or the energy storage winding has faults, fault information of the power supply winding or the energy storage winding is transmitted to a display device by using a measurement and control device, and the fault information comprises the serial number of the fault winding, the voltage of the fault winding and the fault time.

8. The method as claimed in claim 5, wherein if all the power supply windings and the energy storage windings are operating normally, the monitoring and control device sends out a control signal to control the main circuit switches to be turned on, the interconnection circuit switches to be turned off, and the bidirectional power converter of the energy storage device to operate in the charging mode, further comprising:

after each main circuit switch is closed, the blocking device triggers the control element of the interconnection circuit switch to block its trigger circuit.

9. The method as claimed in claim 5, wherein if any one of the power supply windings or the energy storage windings fails, the measurement and control device sends a control signal to disconnect the failed power supply winding or the energy storage winding from the main loop switch and to switch on any one of the adjacent interconnection loop switches of the failed power supply winding or the energy storage winding, and further comprising:

the locking device firstly releases the locking of any adjacent interconnection loop switch of the power supply winding or the energy storage winding with the fault, and after the main loop switch adjacent to the power supply winding or the energy storage winding with the fault is disconnected, the locking device locks the main loop switch.

Technical Field

The application relates to the technical field of electric power distribution equipment, in particular to a control system and a control method of a power supply in a ring main unit.

Background

The ring main unit is one of main power equipment of the power distribution network, has the advantages of simple structure, low cost and reliable operation, is widely applied to the switching station, the ring main unit, the power distribution station, the pre-installed box transformer substation and the like of the power distribution line, can greatly improve the power supply reliability and the economical efficiency of the power distribution network, and reduces the labor intensity. The ring network refers to a ring-shaped power distribution network, namely a power supply main line forms a closed ring shape, and a power supply device in the ring network cabinet supplies power to the ring-shaped main line. Under the general condition, the power supply device comprises a plurality of groups of power supply windings and power supply modules, the power supply windings are connected with the power supply modules in a one-to-one correspondence mode, the power supply device obtains external high-voltage power energy from the outside, and the external high-voltage power energy is transmitted to each power supply module through the power supply windings to meet different power supply requirements.

In the long-term operation process of the ring main unit, due to various objective reasons, after the ring main unit is installed and put into operation, the faults of a cable lap joint, air chamber, operating mechanism and lightning arrester occur easily, so that the hidden danger is brought to the reliable operation of a power grid. Based on the above situation, the on-line monitoring technology of the ring main unit is developed, and high-sensitivity sensors are generally used for continuously extracting energyThe information parameter capable of reflecting the insulation state of the electrical equipment realizes the temperature of the cable of the ring main unit, the temperature of the bus bar pile head, the environmental temperature and humidity, the characteristics of the operating mechanism and the SF in the air chamber according to the continuous information parameter₆The micro-water and density of the gas are monitored in real time.

However, during online monitoring of the ring main unit, it often happens that the online monitoring system of the ring main unit cannot operate due to a fault of the power supply system, for example, a fault of a certain power supply winding causes a power module connected with the power supply winding to be incapable of supplying power, and for example, a fault of all the power supply windings causes a power failure of the ring main unit.

Disclosure of Invention

The application provides a control system and a control method of a power supply in a ring main unit, and provides the control system and the control method of the power supply which can continuously and reliably supply power to the ring main unit when the power supply system breaks down.

The first aspect of the application provides a control system of a power supply in a ring main unit, which comprises an energy storage device, a main loop switch, an interconnection loop switch and a measurement and control device;

the energy storage device is connected with the energy storage winding and used for distributing power to the receiving energy storage winding;

the energy storage device is connected with the adjacent power supply modules;

the main loop switches are arranged on a connecting wire of the power supply winding and the power supply module and on a connecting wire of the energy storage winding and the energy storage device respectively;

Optionally, the main loop switch and the interconnection loop switch are both metal oxide semiconductor field effect transistors, and the control signal terminal is connected to the G electrode of the metal oxide semiconductor field effect transistor.

Optionally, the device further comprises a locking device and a display device;

the measurement and control device further comprises a data end, wherein the data end is connected with the locking device and the display device and is used for transmitting the state information data monitored by the voltage end.

The blocking device comprises an electrical block arranged between the main circuit switch and the interconnection circuit switch;

the display device comprises a display screen and an operation button, the display screen is used for displaying the state information data monitored by the voltage end, and the operation button is used for switching.

Optionally, the energy storage device further includes an energy storage battery and a super capacitor, and the energy storage battery and the super capacitor are connected in parallel between the bidirectional power converter and the ground.

The second aspect of the present application provides a method for controlling a power supply in a ring main unit, where the method for controlling a power supply in a ring main unit is applied to a control system for a power supply in a ring main unit provided by the first aspect of the present application, and the method includes:

Optionally, the process of obtaining the current voltage and the rated voltage of each group of the power supply winding and the energy storage winding and judging whether the power supply winding or the energy storage winding has a fault according to the current voltage and the rated voltage includes:

Optionally, the method further includes:

Optionally, if all power supply winding and energy storage winding all normally operate, then the measurement and control device sends control signal control each main loop switch to close, each interconnection loop switch to break and energy storage device's two-way power converter operates in the process of the mode of charging, still includes:

after each main circuit switch is closed, the blocking device triggers the control element of the interconnection circuit switch to block its trigger circuit.

Optionally, if any power supply winding or energy storage winding has a fault, the measurement and control device sends a control signal to disconnect the faulty power supply winding or energy storage winding from the main loop switch, and switches on any adjacent interconnection loop switch of the faulty power supply winding or energy storage winding, and the method further includes:

The application provides a control system and control method of power supply in looped netowrk cabinet, a control method of power supply in looped netowrk cabinet is applied to a control system of power supply in looped netowrk cabinet, including energy memory, main loop switch, contact loop switch and measurement and control device, energy memory is connected to the energy memory, be used for transmitting power for energy memory, measurement and control device is used for monitoring the state information of every group power supply winding and energy memory, and according to this state information output control signal, be provided with control element on main loop switch and the contact loop switch, this control element receives control signal and opens and shuts with control switch, energy memory includes two-way power converter, be provided with the control port on the two-way power converter, this control port receives control signal and switches over the charge and the power supply mode of two-way power converter with the root switch.

From the above technical solutions, the control system and the control method for the power supply in the ring main unit provided in the embodiments of the present application, by arranging the energy storage device, the main loop switch, the communication loop switch and the measurement and control device, the measurement and control device is utilized to monitor the state information of the winding in real time, sending control signals according to the state information to control the opening and closing of the main loop switch and the interconnection loop switch, and controlling the charging and power supply mode switching of the energy storage device to realize automatic switching to other normal windings for power supply when a certain winding in the power supply fails, when power failure fault happens to the power supply, the emergency power supply of the energy storage device guarantees continuous power supply of the ring main unit, and further, mutual locking functions are achieved between the main loop switch and the interconnection loop switch, misoperation or reverse power transmission of a winding to the system is prevented, and the ring main unit power supply switching device has the advantages of being reliable, high in safety and high in switching speed.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a control system of a power supply in a ring main unit according to an embodiment of the present application.

Detailed Description

In electric power distribution equipment technical field, the inside power supply source of looped netowrk cabinet acquires outer high-voltage power energy from the outside, carries to each power module in order to satisfy different power supply demands behind the winding, and under the normal conditions, winding and power module one-to-one are connected, when certain winding trouble or during all winding trouble, can lead to the unable power supply of looped netowrk cabinet. Therefore, the embodiment of the application provides a control system of power supply in looped netowrk cabinet, including energy memory, main loop switch, interconnection loop switch and measurement and control device, it should be explained that energy memory and outside winding are connected alone, and this winding is as energy storage winding for give energy memory distribution, rather than connecting on the winding that power module corresponds.

Referring to fig. 1, a schematic structural diagram of a control system of a power supply in a ring main unit according to an embodiment of the present application is shown. For example, the prior art provides two power supply windings and one energy storage winding, the two power supply windings are respectively a power supply winding 1 and a power supply winding 2, the power supply winding 1 is connected with a power supply module 1, the power supply winding 2 is connected with the power supply module 2, the power supply module 1 is connected with the power supply module 2, and one energy storage winding is used for distributing power for an energy storage device. The control system of power supply in looped netowrk cabinet that this application embodiment provided includes energy memory, major loop switch, contact circuit switch and measurement and control device.

The energy storage device is connected with the energy storage winding and used for receiving power distribution of the energy storage winding, the energy storage device is connected with the adjacent power module 2, the energy storage device comprises a bidirectional power converter, a control port is arranged on the bidirectional power converter, and the control port is used for receiving signals to switch charging and power supply modes of the bidirectional power converter.

The number of the main loop switches is 3, and the main loop switches are respectively a main loop switch QF1, a main loop switch QF2 and a main loop switch QF3, one end of the main loop switch QF1 is connected with the power supply winding 1, the other end of the main loop switch QF1 is connected with the power supply module 1, one end of the main loop switch QF2 is connected with the power supply winding 2, the other end of the main loop switch QF1 is connected with the power supply module 2, one end of the main loop switch QF3 is connected with the energy storage winding, and the other end of the main loop switch QF3 is connected with the energy storage device; the number of the interconnection loop switches is 2, the interconnection loop switches are an interconnection loop switch QFA and an interconnection loop switch QFB respectively, one end of the interconnection loop switch QFA is connected with the power module 1, the other end of the interconnection loop switch QFA is connected with the power module 2, one end of the interconnection loop switch QFB is connected with the power module 2, and the other end of the interconnection loop switch QFB is connected with the energy storage device. Each main loop switch and each interconnection loop switch are provided with a control element, and the control elements are used for receiving signals to control the opening and closing of the switches.

The measurement and control device comprises a voltage end and a control signal end, wherein the voltage end is connected with the power supply winding 1, the power supply winding 2 and the energy storage winding and is used for monitoring the state information of the power supply winding 1, the power supply winding 2 and the energy storage winding in real time, and the state information comprises the voltage and the current of the power supply winding 1, the power supply winding 2 and the energy storage winding; the control signal end is connected with all the main loop switches and the interconnection loop switches; furthermore, the main loop switch and the interconnection loop switch are both metal oxide semiconductor field effect transistors, and the control signal end is connected to the G electrode of the metal oxide semiconductor field effect transistor; and the control signal end is also connected with a control port on the bidirectional power converter of the energy storage device, and the measurement and control device transmits control signals to the main loop switch, the interconnection loop switch and the energy storage device according to the real-time monitored state information.

Further, the control system of power supply in looped netowrk cabinet that this application embodiment provided still includes blocking device and display device, measurement and control device still includes the data end, the data end is connected blocking device with display device for the main loop switch that the status information data and the control signal end of transmission voltage end monitoring are connected and contact the information of opening and shutting of return circuit switch.

The blocking device comprises an electrical block arranged between the main circuit switch and the interconnection circuit switch.

The display device comprises a display screen and an operation button, the display screen is used for displaying the state information data monitored by the voltage end, and the operation button is used for displaying and switching.

Further, the energy storage device further comprises an energy storage battery and a super capacitor, and the energy storage battery and the super capacitor are connected between the bidirectional power converter and the ground in parallel.

When the power supply winding and the energy storage winding both normally run, the measurement and control device sends out control signals to control the main loop switch QF1, the main loop switch QF2 and the main loop switch QF3 to be closed, the interconnection loop switch QFA and the interconnection loop switch QFB to be disconnected, and to control the energy storage device to run in a charging mode, the energy storage winding charges the energy storage battery and the super capacitor of the energy storage device through the main loop switch QF3, further, the locking device locks the main loop switch and the interconnection loop switch mutually, after the main loop switch QF1, the main loop switch 2 and the main loop switch QFB 3 are all closed, the trigger circuit of the gate level G of the interconnection loop switch QFA and the interconnection loop switch QFB to be locked is switched off, and the measurement and control device transmits the voltage and current of the power supply winding 1, the power supply winding 2 and the energy storage winding which are monitored in real time and the switching information of each switch to the display device, the display device carries out visual display through the display screen.

When a certain winding fails, for example, the power supply winding 1 fails, the measurement and control device sends a control signal to disconnect the main loop switch QF1 adjacent to the power supply winding 1, close the interconnection loop switch QFA adjacent to the main loop switch QF1, and supply power to the power module 1 through the main loop switch QF2 and the interconnection loop switch QFA by the power supply winding 2, further, when the power supply winding 1 fails, the locking device firstly releases the locking of the interconnection loop switch QFA gate level trigger circuit, and locks the gate level trigger circuit of the main loop switch QF1 after the short time delay and the disconnection of the main loop switch QF 1; for another example, when the power supply winding 2 fails, the locking device releases the locking, the measurement and control device sends a command to open the main circuit switch QF2 adjacent to the power supply winding 2, close any adjacent interconnection circuit switch, such as the interconnection circuit switch QFA, of the main circuit switch QF2, the power supply winding 1 supplies power to the power module 2 through the main circuit switch QF1 and the interconnection circuit switch QFA, further, when the power supply winding 2 fails, the locking device firstly releases the locking of the interconnection circuit switch QFA gate level trigger circuit, and locks the gate level trigger circuit of the main circuit switch QF2 after a short time delay and the main circuit switch QF2 is disconnected.

When power supply winding 1, power supply winding 2 and energy storage winding all broke down, measurement and control device sent control signal disconnection all major loop switches, contact loop switch closes in proper order through short time delay, and control energy storage device's two-way power converter switches over to the power mode, continues to be power module 1 and power module 2 power supply by energy storage battery and super capacitor, and is further, measurement and control device transmits winding fault information to display device, including the sequence number of trouble winding, voltage when trouble and the time when trouble.

Furthermore, the energy storage device automatically stops charging when charging to the maximum charging voltage, and stops supplying power after supplying power to the minimum power supply voltage, the energy storage device transmits the operation mode of the energy storage device, the electric quantity of the energy storage device and the voltage of the energy storage device to the measurement and control device in real time through the control port of the bidirectional power converter, and the measurement and control device transmits the information of the energy storage device to the display device in real time for visual display.

Corresponding to the foregoing embodiment of a control system for a power supply in a ring main unit, the present application further provides an embodiment of a control method for a power supply in a ring main unit, where the control method for a power supply in a ring main unit is applied to the control system for a power supply in a ring main unit provided in the foregoing embodiment of the present application, and includes:

and monitoring the state information of each group of power supply windings and energy storage windings in real time through a measurement and control device, wherein the state information comprises the current voltages of the power supply windings and the energy storage windings.

And acquiring the current voltage and the rated voltage of each group of power supply winding and energy storage winding, and judging whether the power supply winding or the energy storage winding has faults or not according to the current voltage and the rated voltage.

And if all the power supply windings and the energy storage windings run normally, the measurement and control device sends out control signals to control the closing of each main loop switch, the opening of each interconnection loop switch and the operation of the bidirectional power converter of the energy storage device in a charging mode.

If any power supply winding or energy storage winding has a fault, the measurement and control device sends a control signal to disconnect the power supply winding or the energy storage winding with the fault from the main loop switch and switch on any adjacent interconnection loop switch of the power supply winding or the energy storage winding with the fault.

If all the power supply windings and the energy storage windings are in fault, the measurement and control device sends out control signals to disconnect all the main loop switches, then sequentially switch on all the interconnection loop switches, and control the bidirectional power converter of the energy storage device to operate in a power supply mode.

Further, the process of obtaining the current voltage and the rated voltage of each group of the power supply winding and the energy storage winding and judging whether the power supply winding or the energy storage winding has a fault according to the current voltage and the rated voltage includes:

Further, the method also comprises the following steps:

Further, if all power supply winding and energy storage winding all normally operated, then the process that measurement and control device sent control signal control each main loop switch closed, each interconnection loop switch disconnection and energy storage device's two-way power converter operation at the mode of charging still includes:

after each main circuit switch is closed, the blocking device triggers the control element of the interconnection circuit switch to block its trigger circuit.

Further, if any power supply winding or energy storage winding has a fault, the process that the measurement and control device sends a control signal to disconnect the power supply winding or the energy storage winding with the fault from being close to the main loop switch and to switch on any adjacent interconnection loop switch of the power supply winding or the energy storage winding with the fault further comprises the following steps:

The embodiment of the application provides a control system and a control method of a power supply in a ring main unit, the control method of the power supply in the ring main unit is applied to the control system of the power supply in the ring main unit, the control system comprises an energy storage device, a main loop switch, a communication loop switch and a measurement and control device, the energy storage winding is connected with the energy storage device and used for transmitting power to the energy storage device, the measurement and control device is used for monitoring the state information of each group of power supply winding and the energy storage winding and outputting a control signal according to the state information, control elements are arranged on the main loop switch and the communication loop switch and used for receiving the control signal to control the on-off of the switch, the energy storage device comprises a bidirectional power converter, a control port is arranged on the bidirectional power converter and used for receiving the control signal to switch the charging and power supply modes of the bidirectional power converter.

Therefore, the control system and the control method for the power supply in the ring main unit provided by the embodiment of the application, by arranging the energy storage device, the main loop switch, the communication loop switch and the measurement and control device, the measurement and control device is utilized to monitor the state information of the winding in real time, sending control signals according to the state information to control the opening and closing of the main loop switch and the interconnection loop switch, and controlling the charging and power supply mode switching of the energy storage device to realize automatic switching to other normal windings for power supply when a certain winding in the power supply fails, when power failure fault happens to the power supply, the emergency power supply of the energy storage device guarantees continuous power supply of the ring main unit, and further, mutual locking functions are achieved between the main loop switch and the interconnection loop switch, misoperation or reverse power transmission of a winding to the system is prevented, and the ring main unit power supply switching device has the advantages of being reliable, high in safety and high in switching speed.

The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.

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