Wind power variable pitch control system with self-generating function and control method thereof
阅读说明：本技术 一种具有自发电功能的风电变桨控制系统及其控制方法 (Wind power variable pitch control system with self-generating function and control method thereof ) 是由 胡小华 唐胜 谢敬朗 胡作 黄学静 张成万 易东 幸红燕 于 2019-11-06 设计创作，主要内容包括：本发明涉及风力发电领域,公开了一种具有自发电功能的风电变桨控制系统,包括设置在轮毂内的变桨控制系统和设置在机舱内的滑环,所述滑环与机舱电源电连接,还包括M台发电机和控制装置,所述控制装置用于检测所述发电机的电输出以控制所述发电机的电输出能够满足变桨控制系统的用电需求、选择所述发电机的电输出或滑环的电输出作为变桨控制系统的供电电源、将超出变桨控制系统的用电需求的所述发电机的输出的电量回馈给机舱,本发明还公开了一种具有自发电功能的风电变桨控制系统的控制方法。有益效果为：变桨控制系统可在绝大部分的运行时间内实现自我供电,有效降低了风电机组的自耗电；可大幅降低滑环的电流负荷,提高滑环的使用寿命。(The invention relates to the field of wind power generation, and discloses a wind power variable pitch control system with a self-generating function, which comprises a variable pitch control system arranged in a hub and a sliding ring arranged in a cabin, wherein the sliding ring is electrically connected with a cabin power supply, the wind power variable pitch control system also comprises M generators and a control device, the control device is used for detecting the electrical output of the generators so as to control the electrical output of the generators to meet the power consumption requirement of the variable pitch control system, selecting the electrical output of the generators or the electrical output of the sliding ring as a power supply of the variable pitch control system, and feeding back the electrical quantity of the output of the generators exceeding the power consumption requirement of the variable pitch control system to the cabin. The beneficial effects are that: the variable-pitch control system can realize self power supply in most of operation time, and the self power consumption of the wind turbine generator is effectively reduced; the current load of the slip ring can be greatly reduced, and the service life of the slip ring is prolonged.)
1. The wind power variable pitch control system with the self-generating function comprises a variable pitch control system arranged in a hub and a sliding ring arranged in a cabin, wherein the sliding ring is electrically connected with a cabin power supply, and the wind power variable pitch control system is characterized by further comprising M generators and a control device, wherein M is a positive integer not less than 1, a generator shaft of the generator is connected with a main shaft of a fan unit through a connecting device, a rotating speed sensor is arranged on the main shaft of the fan unit, the input end of the control device is respectively electrically connected with an electric output end of the generator, an electric output end of the sliding ring and the rotating speed sensor, the output end of the control device is respectively electrically connected with the generator, a power supply input end of the variable pitch control system and an electric input end of the sliding ring, wherein the control device is used for detecting the electric output of the generator so as to control the electric output of the generator to meet, Selecting the electrical output of the generator or the electrical output of the slip ring as a power supply for the pitch control system, feeding back the electrical quantity of the output of the generator exceeding the power demand of the pitch control system to the nacelle.
2. The wind power pitch control system with the self-generating function according to claim 1, wherein the control device comprises a detection unit, an inversion control unit, an excitation control unit and a switching control unit;
the input end of the detection unit is electrically connected with the electrical output end of the slip ring, the electrical output end of the generator and the rotating speed sensor;
the output end of the detection unit is electrically connected with the control end of the switching control unit and the input end of the excitation control unit;
the output end of the excitation control unit is electrically connected with the generator;
the input end of the switching control unit is electrically connected with the electric output end of the generator and the electric output end of the slip ring respectively;
the output end of the switching control unit is electrically connected with the power supply input end of the variable pitch control system;
the input end of the inversion control unit is electrically connected with the electric output end of the generator, and the output end of the inversion control unit is electrically connected with the electric input end of the slip ring.
3. The wind power pitch control system with the self-generating function according to claim 1, wherein the connecting device comprises a coupling device and/or a speed-increasing gearbox.
4. The wind power pitch control system with the self-generating function according to claim 1, wherein M generators are arranged in the hub and/or outside the hub, and the power combination of the M generators is matched with the power required by the pitch control system.
5. The wind power pitch control system with the self-generating function according to any one of claims 1 to 4, wherein M generators are synchronous generators or asynchronous generators.
6. A control method of a wind power pitch control system with a self-generating function is characterized in that the wind power pitch control system with the self-generating function as claimed in claims 1-5 is adopted, and the method comprises the following steps:
s1, connecting the electric output end of the slip ring with the power supply input end of a variable pitch control system through the control device, and enabling the electric output end of the slip ring to supply power to the variable pitch control system to enable the fan unit to be started;
s2, when the running state of the fan unit is stable, the control device applies excitation to the generator to enable the generator to be in a power generation state, and the electric output end of the generator and the rotating speed sensor on the main shaft of the fan unit are electrically connected with the control device;
s3, the control device judges whether the power generation state of the generator is stable and can meet the power consumption requirement of a variable pitch control system, if yes, the step S4 is carried out, and if not, the generator continues to wait for power generation;
s4, the control device switches the pitch control system to be connected with the electric output end of the generator;
and S5, the control device judges whether the electric energy of the electric output end of the generator exceeds the electricity demand of the variable pitch control system, if so, the electric energy feedback function is started to feed the electric energy exceeding the variable pitch control system back to the cabin.
7. The method for controlling the wind power pitch control system with the self-generating function according to claim 6, wherein in the steps S1-S5, the electrical output end of the slip ring and the electrical output end of the generator are electrically connected with the input end of a switching control unit and the input end of a detection unit in the control device, and a rotation speed sensor on a main shaft of the fan set is electrically connected with the detection unit; the output end of the detection unit is respectively and electrically connected with the input end of an excitation control unit and the control end of a switching control unit in the control device; the output end of the excitation control unit is electrically connected with the generator; the output end of the switching control unit is electrically connected with the power supply input end of the variable pitch control system; the input end of an inversion control unit in the control device is electrically connected with the electric output end of the generator, and the output end of the inversion control unit is electrically connected with the electric input end of the slip ring.
8. The control method of the wind power pitch control system with the self-generating function according to claim 7, wherein the specific steps of the step S2 are as follows:
s2.1, detecting an output value of an electric output end of the slip ring and a rotating speed value of a rotating speed sensor by the detection unit;
s2.2, when the rotating speed value of the rotating speed sensor reaches the rated rotating speed and enters a stable running state, triggering the excitation control unit to output excitation current to the generator to enable the generator to be in a power generation state;
s2.3, the detection unit detects the output value of the electric output end of the generator.
9. The method as claimed in claim 7, wherein in step S4, when the detection unit detects that the electrical output end of the generator meets the power generation requirement of the pitch control system, the switching control unit is triggered to switch the electrical output end of the slip ring to be connected with the power input end of the pitch control system.
10. The method as claimed in claim 7, wherein in step S5, when the inverter control unit detects that the power at the power output of the generator exceeds the power demand of the pitch control system, the power feedback function is activated to feed back the power exceeding the pitch control system to the nacelle.
Technical Field
The invention relates to the field of wind power generation, in particular to a wind power variable pitch control system with a self-generating function and a control method thereof.
Background
Along with the continuous reduction of limited resources such as global coal mines, petroleum and the like, thermal power generation is resisted by various countries, and the limitation of hydroelectric power generation is increasingly increased, so that new energy sources such as wind energy, nuclear energy, solar energy, tidal energy and the like can be further increased in application. The thermal power generation not only consumes earth resources, but also causes air pollution and global temperature rise, and the wind power generation has the characteristics of no pollution and reproducibility and is widely concerned. The wind energy is a clean energy with rapid development and has wide development prospect in China.
In recent years, with the high-speed development of the wind power industry, the wind power technology is continuously updated, the power of a single machine supporting a wind turbine generator is continuously increased, the capacity of equipment matched with the generator is correspondingly increased, the self-power consumption is increased while the integral generated energy is increased, and the equipment efficiency and the environment-friendly performance are reduced. How to improve equipment efficiency, increase the wind turbine generator system generated energy, and then improve the power generation benefit, technical innovation is the must way.
The variable pitch control system is one of the key parts of the wind turbine generator, and mainly has the functions of adjusting the angle of the blades, stabilizing the rotating speed of the generator and enabling the wind turbine generator to obtain stable wind energy under the condition of ensuring safety. Due to the rapid and variable characteristic of the wind speed, the angle position of the blade needs to be changed in real time to stabilize the rotating speed of the fan, the self weight of the blade and the wind power effect are added, the huge load needs a variable pitch control system to have enough output power to control the angle of the blade, and a large amount of energy needs to be consumed. In addition, the electricity consumption of the traditional variable pitch control system is completely transmitted through the slip ring, the service life of the slip ring is greatly shortened by long-time large-current electrification, and the running cost of the unit is increased. Therefore, it is very important to solve the power consumption problem of the pitch control system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a wind power variable pitch control system with a self-generating function and a control method thereof, which solve the problem that the energy consumption of the variable pitch control system is correspondingly increased along with the continuous increase of the single machine power of a wind turbine generator.
In order to solve the technical problems, the invention adopts the following technical scheme:
the wind power variable pitch control system with the self-generating function comprises a variable pitch control system arranged in a hub and a sliding ring arranged in a cabin, wherein the sliding ring is electrically connected with a cabin power supply, the wind power variable pitch control system further comprises M generators and a control device, M is a positive integer not less than 1, a generator shaft of the generator is connected with a main shaft of a fan set through a connecting device, a rotating speed sensor is arranged on the main shaft of the fan set, the input end of the control device is respectively and electrically connected with an electric output end of the generator, an electric output end of the sliding ring and the rotating speed sensor, the output end of the control device is respectively and electrically connected with the power input end of the generator, the power input end of the variable pitch control system and the electric input end of the sliding ring, wherein the control device is used for detecting the electric output of the generator so as to control the electric output, Selecting the electrical output of the generator or the electrical output of the slip ring as a power supply for the pitch control system, feeding back the electrical quantity of the output of the generator exceeding the power demand of the pitch control system to the nacelle.
As optimization, the control device comprises a detection unit, an inversion control unit, an excitation control unit and a switching control unit;
the input end of the detection unit is electrically connected with the electrical output end of the slip ring, the electrical output end of the generator and the rotating speed sensor;
the output end of the detection unit is electrically connected with the control end of the switching control unit and the input end of the excitation control unit;
the output end of the excitation control unit is electrically connected with the generator;
the input end of the switching control unit is electrically connected with the electric output end of the generator and the electric output end of the slip ring respectively;
the output end of the switching control unit is electrically connected with the power supply input end of the variable pitch control system;
the input end of the inversion control unit is electrically connected with the electric output end of the generator, and the output end of the inversion control unit is electrically connected with the electric input end of the slip ring.
Preferably, the coupling means comprises a coupling arrangement and/or a step-up gear box.
For optimization, M generators are arranged in the hub and/or outside the hub, and the power combination of the M generators is matched with the power required by a variable pitch control system.
The invention also discloses a control method of the wind power variable pitch control system with the self-generating function, which comprises the following steps:
s1, connecting the electric output end of the slip ring with the power supply input end of a variable pitch control system through the control device, and enabling the electric output end of the slip ring to supply power to the variable pitch control system to enable the fan unit to be started;
s2, when the running state of the fan unit is stable, the control device applies excitation to the generator to enable the generator to be in a power generation state, and the electric output end of the generator and the rotating speed sensor on the main shaft of the fan unit are electrically connected with the control device;
s3, the control device judges whether the power generation state of the generator is stable and can meet the power consumption requirement of a variable pitch control system, if yes, the step S4 is carried out, and if not, the generator continues to wait for power generation;
s4, the control device switches the pitch control system to be connected with the electric output end of the generator;
and S5, the control device judges whether the electric energy of the electric output end of the generator exceeds the electricity demand of the variable pitch control system, if so, the electric energy feedback function is started to feed the electric energy exceeding the variable pitch control system back to the cabin.
Preferably, in the steps S1-S5, the electrical output end of the slip ring and the electrical output end of the generator are electrically connected to the input end of a switching control unit and the input end of a detection unit in the control device, and the rotation speed sensor on the main shaft of the fan unit is electrically connected to the detection unit; the output end of the detection unit is respectively and electrically connected with the input end of an excitation control unit and the control end of a switching control unit in the control device; the output end of the excitation control unit is electrically connected with the generator; the output end of the switching control unit is electrically connected with the power supply input end of the variable pitch control system; the input end of an inversion control unit in the control device is electrically connected with the electric output end of the generator, and the output end of the inversion control unit is electrically connected with the electric input end of the slip ring.
As an optimization, the specific steps of step S2 are as follows:
s2.1, detecting an output value of an electric output end of the slip ring and a rotating speed value of a rotating speed sensor by the detection unit;
s2.2, when the rotating speed value of the rotating speed sensor reaches the rated rotating speed and enters a stable running state, triggering the excitation control unit to output excitation current to the generator to enable the generator to be in a power generation state;
s2.3, the detection unit detects the output value of the electric output end of the generator. .
As an optimization, in step S4, when the detection unit detects that the electrical output end of the generator meets the power generation requirement of the pitch control system, the switching control unit is triggered to switch the electrical output end of the slip ring to be connected with the electrical output end of the generator and the power input end of the pitch control system.
As an optimization, in step S5, when the inverter control unit detects that the electric energy at the electric output end of the generator exceeds the power demand of the pitch control system, the electric energy feedback function is started to feed the electric energy exceeding the pitch control system back to the nacelle.
The invention has the beneficial effects that:
1. the variable-pitch control system can realize self-power supply in most of operation time, thereby effectively reducing the self-power consumption of the wind turbine generator and generating good economic benefit;
2. the current load of the slip ring can be greatly reduced, the service life of the slip ring is prolonged, and the running cost of the wind turbine generator is reduced;
3. the surplus electric energy is fed back to the power grid, energy can be provided for other electric equipment on the unit, the self-power consumption of the unit is further reduced, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic structural diagram of a wind power pitch control system with a self-generating function according to the present invention;
FIG. 2 is an electrical schematic block diagram of a wind power pitch control system with a self-generating function according to the present invention;
fig. 3 is an electrical schematic block diagram of the control device of fig. 1 or 2.
In the attached drawings, 1 is a control device, 11 is a monitoring unit, 12 is an inversion control unit, 13 is an excitation control unit, 14 is a switching control unit, 2 is a slip ring, 3 is a generator, 4 is a cabin power supply, 5 is a rotation speed sensor, 6 is a variable pitch control system, and 61 is a power supply input end.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-3, because the pitch control system operates in a rotating hub in real time, the self-generating condition is inherently thick, and the internal space of the hub can meet the installation requirement of the power generation equipment as the power of a single machine of the fan unit is continuously increased, the wind power pitch control system with the self-generating function provided by the invention comprises a
In this embodiment, the connecting device may be a coupling device, i.e. a coupling, and/or a step-up gear box or other existing connectors.
The invention is also provided with a
In the present embodiment, the
The input end of the
the output end of the
the output end of the
the input end of the
the output end of the
the input end of the
The detecting unit is used for detecting the current value, the voltage value and the frequency value of the slip ring, the current value, the voltage value and the frequency value of the generator and the rotating speed value of the rotating speed sensor, and the current value, the voltage value, the frequency value and the rotating speed value of the rotating speed sensor are synthesized by adopting the existing current, voltage, frequency and rotating speed detecting units, for example: the current voltage detector and the frequency detector are used for detecting the current voltage of the slip ring and the generator by using a detection unit by referring to a circuit of a digital resistance measuring instrument with a brand of New Newre and a model of VIP-2009 on the market, for example, the frequency of the slip ring and the generator can be detected by referring to a circuit with a patent number of 201420411279.8 and a patent name of a power supply frequency detector, and the rotating speed of the generator can be detected by referring to a patent number of 201210102687.0 and a patent name of 'a method and a device for detecting the rotating speed in slack season'.
The excitation control unit is used for applying an excitation current to a stator of the generator to provide a working magnetic field for the generator, and the excitation control unit can be composed of an excitation circuit and a controller, for example, the reference patent number is as follows:
201410793997.0, the patent name "an exciting circuit" to realize applying exciting current to the generator, the controller can be a single chip microcomputer or a PLC or ARM controller, the exciting circuit is triggered by the controller receiving the rotating speed value of the rotating speed sensor detected by the detection unit, and when the controller receiving the rotating speed value detected by the detection unit reaches a certain value and is stable for a period of time, the exciting circuit is triggered by the controller to apply exciting current to the generator. The rotating speed value reaching a certain value and stabilizing for a period of time can be set according to the actual condition of the fan unit.
The switching control unit is used for switching a power supply input end of the variable pitch control system to be connected with an electric output end of the slip ring or connected with an electric output end of the generator. The switching control unit can be composed of a switch circuit and a controller, the switch circuit can select the simplest relay or select a more complex switch circuit with high stability, for example, the patent number is '201410042735.0', the patent name is 'switch circuit' to realize the selection of the connection end of the power supply input end of the pitch control system, the controller can be a single chip microcomputer or a PLC or ARM controller, the controller receives the current value, the voltage value and the frequency value of the generator detected by the detection unit to trigger the switching control unit to switch and connect the power input end of the variable pitch control system, when the current value, the voltage value and the frequency value of the generator received by the controller reach certain values and are stable for a period of time, the controller triggers the switching control unit to switch the connecting end of the power supply input end of the variable pitch control system from the electrical output end of the slip ring into the electrical output end of the generator. The current value, the voltage value and the frequency value of the generator reach certain values and are stable for a period of time, and the values can be set according to the actual situation of the fan set.
The inversion control unit is used for feeding back electric energy which is output by the electric output end of the generator and exceeds the variable pitch control system to the engine room, providing electric energy for other electric equipment of the fan unit or transmitting the electric energy to a power grid, and increasing the generated energy of the fan unit. The inversion control unit may be composed of an inversion circuit and a controller, for example, with reference to patent No. 201721734777.6 and the patent name "energy feedback type three-phase grid-connected inverter", the electric energy output by the electric output end of the generator and exceeding the pitch control system is fed back to the nacelle, the controller may be a single chip microcomputer, a PLC, or an ARM controller, the current value and the voltage value of the electric output end of the generator are received by the controller, a threshold value is set for the controller, and if the electric energy of the electric output end of the generator exceeds the threshold value and is stabilized for a period of time, the controller triggers the inversion circuit to transmit the electric energy exceeding the threshold value to the nacelle through a point input end of the slip ring, where the electric energy refers to the capability of electricity to apply work (i.e., generate energy) in various. The electric energy formula is W UIt Pt, where W is the electric energy of the generator, U is the voltage output by the electrical output of the generator, I is the current output by the electrical output of the generator, t is the time, and P is the power of the generator.
The invention also provides a control method of the wind power variable pitch control system with the self-generating function, which comprises the following steps that firstly, the control method comprises a control device 1, the control device 1 comprises a detection unit 11, an inversion control unit 12, an excitation control unit 13 and a switching control unit 14, the electric output end of the slip ring 2 and the electric output end of the generator 3 are electrically connected with the input end of the switching control unit 14 and the input end of the detection unit 11 in the control device 1, and a rotating speed sensor on a main shaft of a fan unit is electrically connected with the detection unit; the output end of the detection unit is respectively and electrically connected with the input end of an excitation control unit and the control end of a switching control unit in the control device; the output end of the excitation control unit is electrically connected with the generator; the output end of the switching control unit is electrically connected with the power supply input end of the variable pitch control system; the input end of an inversion control unit in the control device is electrically connected with the electric output end of the generator, and the output end of the inversion control unit is electrically connected with the electric input end of the slip ring.
The method comprises the following steps:
s1, the electrical output end of the
S2, when the running state of the fan set is stable, the control device applies excitation to the generator to enable the generator to be in a power generation state, and the electric output end of the generator and the rotating speed sensor on the rotor of the main shaft of the fan set are electrically connected with the control device;
the method specifically comprises the following steps: s2.1, detecting an output value of an electric output end of the slip ring and a rotating speed value of a rotating speed sensor by the detection unit; the output value of the electrical output of the slip ring here comprises the output voltage value, the output current value and the output frequency value of the slip ring, i.e. the frequency value of the nacelle power supply.
S2.2, when the rotating speed value of the rotating speed sensor reaches the rated rotating speed and enters a stable running state, triggering the excitation control unit to output excitation current to the generator to enable the generator to be in a power generation state; the rotating speed value reaches the rated rotating speed and enters a stable running state, namely the rotating speed of the main shaft of the fan set reaches the rated speed and enters the stable state. The excitation control unit outputs excitation current to a stator of the generator to provide a working magnetic field for the generator, and a main shaft of the fan unit drives a rotor of the generator to rotate, so that the generator is in a power generation state.
S2.3, the detection unit detects the output value of the electric output end of the generator. When the generator starts to generate electricity, current, voltage and frequency are output from the electrical output terminal of the generator, so that the detection unit can detect the output value of the electrical output terminal of the generator.
S3, the control device judges whether the power generation state of the generator is stable and can meet the power consumption requirement of a variable pitch control system, if yes, the step S4 is carried out, and if not, the generator continues to wait for power generation;
s4, the control device switches the pitch control system to be connected with the electric output end of the generator;
in this embodiment, in step S4, when the detection unit detects that the electrical output end of the generator meets the power generation requirement of the pitch control system, the switching control unit is triggered to switch the electrical output end of the slip ring to be connected with the electrical output end of the generator and the power input end of the pitch control system, and the slip ring does not supply power any more.
And S5, the control device judges whether the electric energy of the electric output end of the generator exceeds the electricity demand of the variable pitch control system, if so, the electric energy feedback function is started to feed the electric energy exceeding the variable pitch control system back to the cabin.
In this embodiment, in step S5, when the inverter control unit detects that the electric energy at the electric output end of the generator exceeds the power demand of the pitch control system, the electric energy feedback function is started to feed the electric energy exceeding the pitch control system back to the nacelle, so as to provide electric energy for other electric equipment of the fan unit or transmit the electric energy to the power grid, thereby increasing the power generation amount of the fan unit.
The technical scheme of the invention is as follows:
when the wind turbine generator is in the initial stages of the shutdown, standby, starting and running states, the electricity for the hub is provided by the engine room through the slip ring. When the wind turbine generator is in a stable operation state, the control device starts to apply excitation to the generator rotor to start the generator to generate power, the generator arranged in the hub is connected with the main shaft of the wind turbine generator through the coupling device or the speed-up gear box, the hub rotates to drive the generator rotor to rotate, and the excitation is applied to enable the generator to be in a power generation state. The power of generator output and the power of sliding ring input insert controlling means simultaneously, and controlling means detects two way powers respectively, when generator function stable output and can satisfy the power consumption demand of the oar control system of becoming, switches the sliding ring power supply into the generator power supply to the realization becomes oar control system from the electricity generation function. When the generated energy is larger than the electricity consumption of the pitch control system, the control device can feed the redundant electricity back to the engine room to provide electricity for other electricity utilization equipment of the generator set or transmit the electricity to a power grid, and the generated energy of the wind turbine generator set is increased.
The control device is a composite control unit integrating the functions of input voltage current frequency detection, output switching control, generator rotating speed detection, excitation control, inversion control and the like. The control device detects the voltage, the current, the frequency and the rotating speed of the generator of the two input power supplies in real time to determine whether the generator meets the generating condition. When the rotating speed of the generator reaches the rated rotating speed and enters a stable operation state, the control device gradually outputs exciting current, starts the generator, and feeds back electric energy generated by the generator to an engine room power grid through inversion control. The inversion control unit can detect whether the electric energy generated by the generator exceeds the power consumption requirement of the variable pitch control system in real time, and starts the electric energy feedback function in due time.
Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
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