CN210806755U - Wind turbine group based on high-voltage direct-current power transmission and power control system thereof - Google Patents
Wind turbine group based on high-voltage direct-current power transmission and power control system thereof Download PDFInfo
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- CN210806755U CN210806755U CN201921886622.3U CN201921886622U CN210806755U CN 210806755 U CN210806755 U CN 210806755U CN 201921886622 U CN201921886622 U CN 201921886622U CN 210806755 U CN210806755 U CN 210806755U
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Abstract
The utility model discloses a wind turbine group and power accuse thereof based on high voltage direct current transmissionSystem, it belongs to the wind turbine group field, wind turbine group is including being connected to the N wind turbines of parallel operation of same frequency conversion alternating current bus, includes: the first step-up transformer is connected with the variable-frequency alternating-current bus; a centralized machine side converter; a real-time wind speed acquisition module; the maximum wind energy output controller is connected with the real-time wind speed acquisition module and is used for calculating the same rotating speed omega of the wind turbine group capable of obtaining the optimal wind energy output according to the real-time wind speedopt(ii) a A centralized machine-side controller for controlling the operation of the motor according to omegaoptControlling a centralized machine side converter to realize variable-speed power generation of N wind turbine generators; and the pitch controller is used for judging whether the output power of each wind turbine exceeds the rated power value or not and outputting a pitch angle control value of each wind turbine. The utility model discloses the wind energy loss under the control of the parallel operation of reducible many wind turbines, and can avoid wind turbine generator system output to exceed the rated value.
Description
Technical Field
The utility model relates to a wind power generation field especially relates to a wind-powered electricity generation group and power control system based on high voltage direct current transmission.
Background
Offshore wind power has the advantages of high wind speed, small turbulence intensity, stable wind speed and direction and the like, and is a main trend of the development of the wind power industry. The cage-type asynchronous generator set has no slip ring or electric brush, has simple and reliable structure, and is beneficial to improving the capacity of a single machine, reducing the offshore maintenance work and increasing the effective power generation time if being applied to offshore wind power. If the wind turbine group centralized control is adopted to replace the stand-alone discrete control, the failure rate is further reduced, and the total system cost is reduced.
However, in the centralized control mode of the wind turbine group, when the wind speed of each wind turbine has a large deviation, a certain wind energy loss is caused, and the output power of the wind turbine group with an excessively high wind speed easily exceeds a rated value, so that how to effectively reduce the wind energy loss, and meanwhile, the problem that the output power of each wind turbine group exceeds the rated value is still to be solved.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a wind turbine group and power control system based on high voltage direct current transmission, can reduce the wind energy loss under the control of many wind turbines parallel operation under the wind turbine group centralized control mode, and can avoid wind turbine group output to exceed the rated value.
In order to solve the technical problem, the utility model provides a technical scheme as follows:
on the one hand, the utility model provides a wind-powered electricity generation group's power control system based on high voltage direct current transmission, wind-powered electricity generation group is including being connected to the N platform parallel operation's of same frequency conversion alternating current generating line wind energy conversion system, include:
the first boosting transformer is connected with the variable-frequency alternating-current bus and is used for boosting variable-frequency alternating current generated by the N wind turbines;
the centralized machine side converter is used for converting the boosted variable frequency alternating current into direct current;
the real-time wind speed acquisition module is used for acquiring the real-time wind speeds of the N wind turbines;
the maximum wind energy output controller is connected with the real-time wind speed acquisition module and is used for calculating the same rotating speed omega of the wind turbine group capable of obtaining the optimal wind energy output according to the real-time wind speedopt；
Centralized machine-side controller for controlling the rotation speed according to the optimal same rotation speed omegaoptControlling a centralized machine side converter to realize variable-speed power generation of N wind turbine generators;
and the pitch controller is used for judging whether the output power of each wind turbine exceeds the rated power value or not and outputting a pitch angle control value of each wind turbine.
And further, the wind power generation system also comprises a voltage sensor and a current sensor which are connected with the N wind turbines and used for acquiring the three-phase voltage and current values of each wind turbine and inputting the three-phase voltage and current values into the variable pitch controller.
The first filter reactor is connected between the first boosting transformer and the centralized machine-side converter and used for filtering the boosted variable-frequency alternating current and communicating the filtered variable-frequency alternating current to the centralized machine-side converter.
Furthermore, a first grounding capacitor is connected between the first filtering reactance and the centralized machine side converter.
Further, the system also comprises a grid-side converter connected with the centralized machine-side converter and used for inverting the direct current into the alternating current.
Further, the system also comprises a high-voltage direct-current transmission link connected between the centralized machine side converter and the grid side converter and used for transmitting the direct current output by the centralized machine side converter to the grid side converter.
Further, direct-current bus capacitors are connected between the centralized machine side converter and the high-voltage direct-current transmission link and between the high-voltage direct-current transmission link and the grid side converter.
And the second boosting voltage transformer is connected with the grid-side converter and is used for boosting the alternating current output by the grid-side converter and connecting the alternating current to a power frequency grid.
Furthermore, the system also comprises a second filter reactance connected between the grid-side converter and the second boosting voltage device, and a grounding capacitor is connected between the second boosting voltage device and the second filter reactance.
In another aspect, a wind turbine group based on high voltage direct current transmission is provided, which comprises N wind turbines running in parallel, and a power control system of the wind turbine group based on high voltage direct current transmission.
Further, the blades of each wind turbine are mechanically connected coaxially to a cage-type asynchronous generator through a gearbox.
After adopting such design, the utility model discloses following advantage has at least:
the utility model discloses a control system can reduce N wind turbine parallel operation in-process based on high voltage direct current transmission's wind-powered electricity generation group, because of the wind energy loss that each wind turbine department wind speed differs in size and leads to, becomes the oar through becoming the control of oar controller simultaneously, avoids the output of each wind turbine group to exceed the rated value, the utility model discloses can guarantee high efficiency, safety, the steady operation of system.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic connection diagram of each component of a power control system of a wind turbine group based on high-voltage direct-current transmission according to the present invention;
fig. 2 is a schematic view of a pitch controller according to the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The utility model provides an embodiment of power control system of wind turbine group based on high voltage direct current transmission, as shown in FIG. 1, 2, wind turbine group is including being connected to the N platform parallel operation's of same frequency conversion alternating current generating line wind energy conversion system, include: the first boosting transformer 1 is connected with the variable-frequency alternating-current bus and is used for boosting variable-frequency alternating current generated by the N wind turbines; the centralized machine side converter is used for converting the boosted variable frequency alternating current into direct current; the real-time wind speed acquisition module is used for acquiring the real-time wind speeds of the N wind turbines; the maximum wind energy output controller is connected with the real-time wind speed acquisition module and is used for calculating the same rotating speed omega of the wind turbine group capable of obtaining the optimal wind energy output according to the real-time wind speedopt(ii) a Centralized machine-side controller for controlling the rotation speed according to the optimal same rotation speed omegaoptControlling a centralized machine side converter to realize variable-speed power generation of N wind turbine generators; a variable pitch controller for judging whether the output power of each wind turbine exceeds the rated powerAnd outputting the pitch angle control value of each wind turbine according to the power value.
The utility model discloses the frequency conversion alternating current that sends at wind-powered electricity generation crowd assembles on frequency conversion alternating current bus, through the whole direct current that is of centralized machine side converter after first step up transformer steps up, becomes the alternating current with the direct current after the high voltage direct current transmission again, then is connected to the power frequency electric wire netting.
The utility model discloses a control system can reduce N wind turbine parallel operation in-process based on high voltage direct current transmission's wind-powered electricity generation group, because of the wind energy loss that each wind turbine department wind speed differs in size and leads to, becomes the oar through becoming the control of oar controller simultaneously, avoids the output of each wind turbine group to exceed the rated value, the utility model discloses can guarantee high efficiency, safety, the steady operation of system.
The utility model discloses a control module is exported to the biggest wind energy provides centralized machine side controller through calculating the optimal control value to realize the best variable speed power generation state of cage type wind-powered electricity generation crowd, thereby catch more wind energy. The reason is that the N wind turbines connected to the same variable-frequency alternating-current bus operate at the same rotating speed, and when the wind speed of each wind turbine has large deviation, each wind turbine deviates from the optimal tip speed ratio to different degrees, so that wind energy loss is caused. The utility model discloses utilize the biggest wind energy output control module to calculate the rotational speed of the same size of each wind energy machine operation of best, ensure that the wind-powered electricity generation crowd obtains the best wind energy capture state on the whole.
The system comprises N wind turbines, a pitch controller, a voltage sensor, a current sensor, a pitch angle controller and a pitch angle controller, wherein the N wind turbines are connected with the voltage sensor and the current sensor, the voltage sensor and the current sensor are used for collecting three-phase voltage and current values of each wind turbine and inputting the three-phase voltage and current values into the pitch controller, the pitch controller inputs the collected three-phase voltage and current values into the pitch controller, and judges whether the output power of each generator exceeds a rated value or not, and the general control is that when the output power of a unit is smaller than the rated value, the pitch angle β of the unit is set to be 0 and does not act, the unit continues to operate in the optimal wind energy capturing state, and when the output power of a certain unit is larger than the rated value, the pitch.
In order to reduce interference, a first filter reactance L connected between the first step-up transformer and the centralized machine-side converter is further included1First filter reactance L1And the frequency conversion alternating current is used for filtering the boosted frequency conversion alternating current and then communicating the filtered frequency conversion alternating current to the centralized machine side converter.
Further, a first filtering reactance L1A first grounding capacitor C is connected between the centralized machine side converter1。
Further, the system also comprises a grid-side converter connected with the centralized machine-side converter and used for inverting the direct current into the alternating current.
Further, the system also comprises a high-voltage direct-current transmission link connected between the centralized machine side converter and the grid side converter and used for transmitting the direct current output by the centralized machine side converter to the grid side converter.
Further, direct-current bus capacitors are connected between the centralized machine side converter and the high-voltage direct-current transmission link and between the high-voltage direct-current transmission link and the grid side converter.
Further, the grid-side converter further comprises a second boosting transformer 2 connected with the grid-side converter and used for boosting the alternating current output by the grid-side converter and connecting the alternating current to a power frequency grid.
Further, a second filter reactance L connected between the grid-side converter and the second booster transformer 2 is included2A second booster transformer 2 and a second filter reactance L2And a grounding capacitor is connected between the two capacitors.
The utility model discloses the frequency conversion alternating current that sends at wind-powered electricity generation group assembles back on frequency conversion alternating current bus, through the whole direct current that is of centralized converter after first step up transformer 1 steps up, is connected with net side converter after transmitting through high voltage direct current transmission link, then is the alternating current with the direct current contravariant, is connected to the power frequency electric wire netting after second step up transformer 2 steps up again.
On the other hand, the high-voltage direct-current transmission-based wind turbine group comprises N wind turbines which are operated in parallel, and the power control system of the high-voltage direct-current transmission-based wind turbine group.
The utility model discloses a wind turbine group mainly indicates cage type wind turbine group, comprises the asynchronous generator of cage type of the firm reliable large capacity of N platform structures, and the blade of each wind turbine passes through the coaxial mechanical connection of gear box to the asynchronous generator of cage type.
The utility model discloses a frequency conversion alternating current that cage type wind-powered electricity generation group sent assembles back on frequency conversion alternating current bus, through the whole direct current that is of centralized converter after first step up transformer 1 steps up, is connected with net side converter after transmitting through high voltage direct current transmission link, then is the alternating current with the direct current contravariant, is connected to the power frequency electric wire netting after second step up transformer 2 steps up again.
The utility model discloses a control system can reduce N wind turbine parallel operation in-process based on high voltage direct current transmission's wind-powered electricity generation group, because of the wind energy loss that each wind turbine department wind speed differs in size and leads to, becomes the oar through becoming the control of oar controller simultaneously, avoids the output of each wind turbine group to exceed the rated value, the utility model discloses can guarantee high efficiency, safety, the steady operation of system.
The above description is only for the preferred embodiment of the present invention, and not intended to limit the present invention in any way, and those skilled in the art can make various modifications, equivalent changes and modifications using the above-described technical content, all of which fall within the scope of the present invention.
Claims (10)
1. A power control system of a wind turbine group based on high-voltage direct-current transmission comprises N wind turbines which are connected to the same variable-frequency alternating-current bus and run in parallel, and is characterized by comprising the following components:
the first boosting transformer is connected with the variable-frequency alternating-current bus and is used for boosting variable-frequency alternating current generated by the N wind turbines;
the centralized machine side converter is used for converting the boosted variable frequency alternating current into direct current;
the real-time wind speed acquisition module is used for acquiring the real-time wind speeds of the N wind turbines;
maximum wind energy output controller, andthe real-time wind speed acquisition module is connected and used for calculating the same rotating speed omega of the wind turbine group capable of obtaining the optimal wind energy output according to the real-time wind speedopt；
Centralized machine-side controller for controlling the rotation speed according to the optimal same rotation speed omegaoptControlling a centralized machine side converter to realize variable-speed power generation of N wind turbine generators;
and the pitch controller is used for judging whether the output power of each wind turbine exceeds the rated power value or not and outputting a pitch angle control value of each wind turbine.
2. The power control system of the high-voltage direct-current transmission-based wind turbine group according to claim 1, further comprising a voltage sensor and a current sensor connected with the N wind turbines, and the voltage sensor and the current sensor are used for acquiring three-phase voltage and current values of each wind turbine and inputting the three-phase voltage and current values into a variable pitch controller.
3. The HVDC-based wind farm power control system according to claim 1, further comprising a first filter reactance connected between the first step-up transformer and the concentrated machine-side converter, the first filter reactance being configured to filter the stepped-up variable frequency AC power and communicate the filtered stepped-up variable frequency AC power to the concentrated machine-side converter.
4. The system according to claim 3, wherein a first ground capacitor is further connected between the first filtering reactance and the centralized machine-side converter.
5. The system according to claim 1, further comprising a grid-side converter connected to the centralized machine-side converter for converting dc power to ac power.
6. The HVDC-based power control system for a wind farm according to claim 5, further comprising a HVDC link connected between the centralized machine-side converter and the grid-side converter for transmitting the DC output from the centralized machine-side converter to the grid-side converter;
and direct-current bus capacitors are connected between the centralized machine side converter and the high-voltage direct-current transmission link and between the high-voltage direct-current transmission link and the grid side converter.
7. The system according to any of claims 1 to 6, further comprising a second step-up transformer connected to the grid-side converter, for step-up connecting the ac output from the grid-side converter to the power grid.
8. The HVDC-based wind farm power control system according to claim 7, further comprising a second filter reactance connected between the grid-side converter and the second boost voltage device, wherein a ground capacitor is further connected between the second boost voltage device and the second filter reactance.
9. A wind turbine group based on high-voltage direct-current transmission, which comprises N wind turbines which are operated in parallel, and is characterized by comprising the power control system of the wind turbine group based on high-voltage direct-current transmission as claimed in any one of claims 1 to 8.
10. The cluster according to claim 9, where the blades of each wind turbine are mechanically connected coaxially to the cage asynchronous generator through a gearbox.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921886622.3U CN210806755U (en) | 2019-11-04 | 2019-11-04 | Wind turbine group based on high-voltage direct-current power transmission and power control system thereof |
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| CN201921886622.3U CN210806755U (en) | 2019-11-04 | 2019-11-04 | Wind turbine group based on high-voltage direct-current power transmission and power control system thereof |
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| CN210806755U true CN210806755U (en) | 2020-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594128A (en) * | 2020-12-14 | 2021-04-02 | 山东中车风电有限公司 | System and method for protecting variable pitch system in power grid phase-loss fault of wind generating set |
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2019
- 2019-11-04 CN CN201921886622.3U patent/CN210806755U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594128A (en) * | 2020-12-14 | 2021-04-02 | 山东中车风电有限公司 | System and method for protecting variable pitch system in power grid phase-loss fault of wind generating set |
| CN112594128B (en) * | 2020-12-14 | 2022-03-01 | 山东中车风电有限公司 | System and method for protecting variable pitch system in power grid phase-loss fault of wind generating set |
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Address after: F17, Block C, International Investment Building, No. 6-9, Fuchengmen North Street, Xicheng District, Beijing 100,034 Patentee after: Longyuan (Beijing) New Energy Engineering Technology Co.,Ltd. Address before: 100034 11th floor, block C, international investment building, 6-9 Fuchengmen North Street, Xicheng District, Beijing Patentee before: LONGYUAN (BEIJING) WIND POWER ENGINEERING TECHNOLOGY Co.,Ltd. |