CN111817346A - Wind power plant starting auxiliary power supply system - Google Patents

Wind power plant starting auxiliary power supply system Download PDF

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Publication number
CN111817346A
CN111817346A CN202010707522.0A CN202010707522A CN111817346A CN 111817346 A CN111817346 A CN 111817346A CN 202010707522 A CN202010707522 A CN 202010707522A CN 111817346 A CN111817346 A CN 111817346A
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China
Prior art keywords
axis
controller
power supply
voltage
unit
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CN202010707522.0A
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Chinese (zh)
Inventor
张�浩
彭国平
史奔
周治国
王红占
李立冬
宋海军
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Guangdong Anpu Electric Power Technology Co ltd
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Guangdong Anpu Electric Power Technology Co ltd
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Priority to CN202010707522.0A priority Critical patent/CN111817346A/en
Publication of CN111817346A publication Critical patent/CN111817346A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a wind power plant starting auxiliary power supply system, which comprises: the auxiliary power supply module can be connected with an external wind driven generator and is used for generating alternating current for assisting the external wind driven generator to start; the input end of the feedback control module is connected with the output end of the auxiliary power supply module, the output end of the feedback control module is connected with the control end of the auxiliary power supply module, and the feedback control module is used for adjusting the output voltage and/or current of the auxiliary power supply module. The power assisting module generates alternating current suitable for starting the wind driven generator and transmits the alternating current to the wind driven generator so as to provide alternating current support for assisting the wind driven generator in starting. After the wind driven generator is started, the feedback control module controls the auxiliary power supply module to reduce the output current to zero, namely, the auxiliary power supply module enters a standby state, and the auxiliary power supply module and the whole system loss are favorably reduced.

Description

Wind power plant starting auxiliary power supply system
Technical Field
The invention relates to the field of wind power plants, in particular to a wind power plant starting auxiliary power supply system.
Background
With the development of wind power generation technology, compared with a land wind farm, an offshore wind farm does not occupy land resources, the sea wind speed is higher, the single machine capacity of an offshore wind farm wind generating set is larger, and the annual utilization hours are higher, so that the offshore wind farm is an important development field of wind power generation, and offshore wind power projects gradually develop towards deep sea and open sea.
The offshore wind farm is merged into a power grid, and the offshore wind farm is far away from the land, so that the traditional alternating current transmission scheme cannot meet the electric energy output of the offshore wind farm in the far sea in a large scale, thereby limiting the large-scale development of the offshore wind farm, referring to the European regional experience with the fastest global development, and the direct current transmission technology becomes the only alternative for outputting electric energy by wind power generation in the deep sea and the far sea.
The distributed direct-current transmission based on the series-connection type uncontrolled converter station is used as a novel offshore wind power direct-current transmission scheme, so that the system cost and the operation loss are greatly reduced, the system reliability is improved, and the development requirements of deep and open sea wind power are greatly met. Because the series-type uncontrolled converter is configured on the sea, the system can not provide starting energy for the wind power plant through the direct-current submarine cable, the wind power plant needs to be additionally configured to start the auxiliary power supply, and the auxiliary power supply needs to be properly regulated and controlled.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a wind power plant starting auxiliary power supply system which can control an auxiliary power supply module to adjust output power and reduce output current after an external wind driven generator is started so as to reduce loss.
The wind power plant starting auxiliary power supply system comprises: the auxiliary power supply module can be connected with an external wind driven generator and is used for generating alternating current for assisting the external wind driven generator to start; the input end of the feedback control module is connected with the output end of the auxiliary power supply module, the output end of the feedback control module is connected with the control end of the auxiliary power supply module, and the feedback control module is used for adjusting the output voltage and/or current of the auxiliary power supply module.
The wind power plant starting auxiliary power supply system provided by the embodiment of the invention at least has the following beneficial effects: the auxiliary power supply module generates alternating current suitable for starting the wind driven generator and transmits the alternating current to the wind driven generator so as to provide alternating current to support the wind driven generator to start. After the wind driven generator is started and starts to generate power, the alternating voltage between the auxiliary power supply module and the wind driven generator can be increased, the feedback control module detects and controls the auxiliary power supply module according to the alternating voltage, so that the auxiliary power supply module adjusts the output power to reduce the output current, and after the wind driven generator is started, the feedback control module controls the auxiliary power supply module to reduce the output current to zero, namely, the auxiliary power supply module enters a standby state, and the auxiliary power supply module and the whole system loss are favorably reduced.
According to some embodiments of the present invention, the feedback control module includes a detection unit and a vector control unit, the detection unit is connected to an output end of the auxiliary power supply module, an input end of the vector control unit is connected to the detection unit, and an output end of the vector control unit is connected to the auxiliary power supply module.
According to some embodiments of the present invention, the vector control unit includes a coordinate transformation unit, a comparison operation unit and an inverse coordinate transformation unit, an input terminal of the coordinate transformation unit is connected to the detection unit, the coordinate transformation unit is configured to calculate a voltage value and/or a current value in a DQ coordinate system according to a voltage value and/or a current value of an alternating current, an output terminal of the coordinate transformation unit is connected to an input terminal of the comparison operation unit, the comparison operation unit is configured to compare the voltage value and/or the current value in the DQ coordinate system with a preset reference value to calculate a control quantity, an output terminal of the comparison operation unit is connected to an input terminal of the inverse coordinate transformation unit, the inverse coordinate transformation unit is configured to calculate a voltage control component and/or a current control component according to the control quantity, an output terminal of the inverse coordinate transformation unit is connected to the auxiliary power supply module, so that the auxiliary power supply module adjusts the magnitude of the output voltage and/or current according to the voltage control component and/or the current control component.
According to some embodiments of the present invention, the comparison operation unit includes a D-axis voltage PI controller and a Q-axis voltage PI controller, and the coordinate transformation unit is provided with a D-axis voltage output terminal and a Q-axis voltage output terminal; a first input end of the D-axis voltage PI controller is connected with the detection unit or the D-axis voltage output end, a second input end of the D-axis voltage PI controller receives a first preset reference voltage value, and an output end of the D-axis voltage PI controller is connected with the inverse coordinate transformation unit; a first input end of the Q-axis voltage PI controller is connected with the detection unit or the Q-axis voltage output end, a second input end of the Q-axis voltage PI controller receives a second preset reference voltage value, and an output end of the Q-axis voltage PI controller is connected with the inverse coordinate transformation unit.
According to some embodiments of the present invention, the comparison operation unit further includes a D-axis current PI controller and a Q-axis current PI controller, and the coordinate transformation unit is provided with a D-axis current output terminal and a Q-axis current output terminal; a first input end of the D-axis current PI controller is connected with an output end of the D-axis voltage PI controller, a second input end of the D-axis current PI controller is connected with a D-axis current output end, and an output end of the D-axis current PI controller is connected with the inverse coordinate transformation unit; the first input end of the Q-axis current PI controller is connected with the output end of the Q-axis voltage PI controller, the second input end of the Q-axis current PI controller is connected with the Q-axis current output end, and the output end of the Q-axis current PI controller is connected with the inverse coordinate transformation unit.
According to some embodiments of the invention, the comparison operation unit further comprises a D-axis clipping unit and a Q-axis clipping unit; the output end of the D-axis voltage PI controller is connected with the input end of the D-axis amplitude limiting unit, the output end of the D-axis amplitude limiting unit is connected with the first input end of the D-axis current PI controller, and the D-axis amplitude limiting unit is used for limiting the output value of the D-axis voltage PI controller within a preset range; the output end of the Q-axis voltage PI controller is connected with the input end of the Q-axis amplitude limiting unit, the output end of the Q-axis amplitude limiting unit is connected with the first input end of the Q-axis current PI controller, and the Q-axis amplitude limiting unit is used for limiting the output value of the Q-axis voltage PI controller within a preset range.
According to some embodiments of the present invention, the comparison operation unit further includes a linkage unit, an input end of the linkage unit is connected to an output end of the Q-axis voltage PI controller, an output end of the linkage unit is connected to a first input end of the Q-axis current PI controller, a control end of the linkage unit is connected to an output end of the D-axis voltage PI controller, and the linkage unit is configured to limit an output value range of the Q-axis voltage PI controller according to an output value of the D-axis voltage PI controller.
According to some embodiments of the present invention, the auxiliary power supply module includes a power transmission line and a power electronic device or an on-load voltage regulating transformer, an input end of the power electronic device is connected to an external power grid or an external dc power transmission system, an input end of the on-load voltage regulating transformer is connected to an external power grid, an output end of the power electronic device or an output end of the on-load voltage regulating transformer is connected to an external wind power generator through the power transmission line, and a control end of the power electronic device or a control end of the on-load voltage regulating transformer is connected to the feedback control module.
According to some embodiments of the invention, the power electronic equipment comprises a back-to-back converter, an input end of the back-to-back converter is connected with an external power grid, an output end of the back-to-back converter is connected with an external wind driven generator through the power transmission line, and a control end of the back-to-back converter is connected with the feedback control module.
According to some embodiments of the invention, the power electronic device comprises an inverter, an input end of the inverter is connected with an external direct current transmission system, an output end of the inverter is connected with an external wind driven generator through the transmission line, and a control end of the inverter is connected with the feedback control module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
fig. 2 is a schematic diagram of a feedback control module according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a wind farm startup auxiliary power supply system according to an embodiment of the present invention includes: the auxiliary power supply module 100, the auxiliary power supply module 100 can be connected with an external wind driven generator, and the auxiliary power supply module 100 is used for generating alternating current for assisting the external wind driven generator to start; the input end of the feedback control module 200 is connected to the output end of the auxiliary power supply module 100, the output end of the feedback control module 200 is connected to the control end of the auxiliary power supply module 100, and the feedback control module 200 is configured to adjust the magnitude of the output voltage and/or current of the auxiliary power supply module 100.
The auxiliary power supply module 100 generates and transmits alternating current suitable for starting the wind driven generator to provide alternating current to support the starting of the wind driven generator. After the wind driven generator starts to generate power, the alternating voltage between the auxiliary power supply module 100 and the wind driven generator increases, the feedback control module 200 detects and controls the auxiliary power supply module 100 according to the alternating voltage, so that the auxiliary power supply module 100 is controlled to adjust the output power to reduce the magnitude of the output current, after the wind driven generator starts, the feedback control module 200 controls the auxiliary power supply module 100 to reduce the output current to zero, namely, the auxiliary power supply module 100 enters a standby state, and the auxiliary power supply module 100 and the overall system loss are favorably reduced.
The auxiliary power module 100 may be connected to a plurality of wind turbines, i.e. to a wind farm, to assist the plurality of wind turbines in starting.
Referring to fig. 2, in some embodiments of the present invention, the feedback control module 200 includes a detection unit 210 and a vector control unit 220, the detection unit 210 is connected to an output terminal of the auxiliary power supply module 100, an input terminal of the vector control unit 220 is connected to the detection unit 210, and an output terminal of the vector control unit 220 is connected to the auxiliary power supply module 100.
The detecting unit 210 detects the alternating current between the auxiliary power supply module 100 and the wind power generator, and feeds back the voltage and the current of the alternating current to the vector control unit 220, and the vector control unit 220 controls the output voltage and/or the current of the auxiliary power supply module 100 in a vector control manner according to the voltage and the current of the alternating current. The voltage and the current of the alternating current are processed by the vector control unit 220 in a vector control mode, so that decoupling of the flux linkage and the torque is realized in the starting process, namely, the flux linkage and the torque can be respectively controlled, and the vector control unit 220 is favorable for controlling the auxiliary power supply module 100 to output the alternating current which is more suitable for assisting the wind driven generator in starting.
The detection unit 210 may include a voltage transformer, a current transformer, and the like capable of detecting voltage and current. The number of the voltage transformers and the current transformers can be multiple to detect the voltage value and the current value of each phase of the alternating current respectively. The detecting unit 210 may also be an embodiment including a conventional effective voltage detecting circuit to detect the effective voltage of the alternating current.
Referring to fig. 2, in some embodiments of the present invention, the vector control unit 220 includes a coordinate transformation unit 221, a comparison operation unit 230, and an inverse coordinate transformation unit 222, an input terminal of the coordinate transformation unit 221 is connected to the detection unit 210, the coordinate transformation unit 221 is configured to calculate a voltage value and/or a current value in a DQ coordinate system according to a voltage value and/or a current value of the alternating current, an output terminal of the coordinate transformation unit 221 is connected to an input terminal of the comparison operation unit 230, the comparison operation unit 230 is configured to compare the voltage value and/or the current value in the DQ coordinate system with a preset reference value to calculate a control quantity, an output terminal of the comparison operation unit 230 is connected to an input terminal of the inverse coordinate transformation unit 222, the inverse coordinate transformation unit 222 is configured to calculate a voltage control component and/or a current control component according to the control quantity, an output terminal of the inverse coordinate transformation unit 222 is connected, so that the auxiliary power module 100 adjusts the magnitude of the output voltage and/or current according to the voltage control component and/or the current control component.
The detecting unit 210 detects the voltage value and the current value of the alternating current and feeds the detected voltage value and current value back to the coordinate transforming unit 221 for coordinate transformation, so that the voltage value and the current value of the alternating current are transformed into the voltage value and the current value of the DQ coordinate system. The comparison operation unit 230 compares the voltage value of the DQ coordinate system with a preset voltage reference value or compares the current value of the DQ coordinate system with a preset current reference value to obtain a control quantity according to the comparison result, wherein the control quantity generally includes a D-axis control quantity and a Q-axis control quantity. The inverse coordinate transformation unit 222 performs inverse coordinate transformation processing on the control fixed quantity so that the control fixed quantity is converted into a voltage control component for controlling the alternating voltage or a current control component for controlling the alternating current. The auxiliary power supply module 100 adjusts the voltage value and the current value of the output alternating current according to the voltage control component and the current control component.
Coordinate transformation unit 221 employs a park transformation scheme, and inverse coordinate transformation unit 222 employs a corresponding inverse park transformation scheme. The voltage value and the current value of the alternating current output by the auxiliary power supply module are converted into the voltage value and the current value under a DQ coordinate system through park transformation, and under the DQ coordinate system, the voltage component and the current component on a D axis and the voltage component and the current component on a Q axis can respectively correspond to control torque and flux linkage, so that the auxiliary power supply module 100 can be controlled to output the alternating current which is more suitable for assisting the starting of the wind driven generator.
The coordinate transformation unit 221 and the inverse coordinate transformation unit 222 may be a piece of processing program in a device capable of performing calculation processing on an input signal, such as a single chip microcomputer or an FPGA.
Referring to fig. 2, in some embodiments of the present invention, the comparison operation unit 230 includes a D-axis voltage PI controller 231 and a Q-axis voltage PI controller 232, and the coordinate transformation unit 221 is provided with a D-axis voltage output terminal and a Q-axis voltage output terminal; a first input end of the D-axis voltage PI controller 231 is connected with the detection unit 210 or the D-axis voltage output end, a second input end of the D-axis voltage PI controller 231 receives a first preset reference voltage value, and an output end of the D-axis voltage PI controller 231 is connected with the inverse coordinate transformation unit 222; a first input terminal of the Q-axis voltage PI controller 232 is connected to the detection unit 210 or the Q-axis voltage output terminal, a second input terminal of the Q-axis voltage PI controller 232 receives a second preset reference voltage value, and an output terminal of the Q-axis voltage PI controller 232 is connected to the inverse coordinate transformation unit 222.
The coordinate transformation unit 221 is provided with a D-axis voltage output terminal, a D-axis current output terminal, a Q-axis voltage output terminal, and a Q-axis current output terminal, and the coordinate transformation unit 221 converts the ac power of the wind turbine generator into a voltage value and a current value in a DQ coordinate, which generally include a D-axis voltage value Vac_dD-axis current value idQ-axis voltage value Vac_qQ axis current value iqAnd the D-axis voltage output end, the D-axis current output end, the Q-axis voltage output end and the Q-axis current output end are respectively corresponding to output.
The D-axis voltage PI controller 231 compares the detection voltage value of the detection unit 210 with a first predetermined reference voltage value V* ac_dCompared, e.g. by the effective value of the voltage V detected by the detection unit 210ac_rmsAnd V* ac_dComparing, or comparing, the D-axis voltage value Vac_dAnd a first predetermined reference voltage value V* ac_dAnd comparing, performing P (proportion) I (integral) processing according to the comparison difference, obtaining a calculation result, and quantitatively transmitting the calculation result to the inverse coordinate transformation unit 222 as D-axis control, so as to control the auxiliary power supply module 100. Similarly, the Q-axis voltage PI controller 232 compares the detected voltage value of the detecting unit 210 with a second predetermined reference voltage value V* ac_qComparing, or comparing, the Q-axis voltage value Vac_qAnd a second predetermined reference voltage value V* ac_qAnd comparing, performing PI processing according to the comparison difference, and quantitatively transmitting the calculation result to the inverse coordinate transformation unit 222 as Q-axis control, thereby controlling the auxiliary power supply module 100. With the structure, the function of voltage closed-loop control is realized in the aspect of a control system, so that the voltage value output by the auxiliary power supply module 100 is changed along with the voltage value of alternating current between the auxiliary power supply module 100 and the wind driven generator.
Referring to fig. 2, in some embodiments of the present invention, the comparison operation unit 230 further includes a D-axis current PI controller 233 and a Q-axis current PI controller 234, and the coordinate transformation unit 221 is provided with a D-axis current output terminal and a Q-axis current output terminal; a first input end of the D-axis current PI controller 233 is connected with an output end of the D-axis voltage PI controller 231, a second input end of the D-axis current PI controller 233 is connected with a D-axis current output end, and an output end of the D-axis current PI controller 233 is connected with the inverse coordinate transformation unit 222; a first input terminal of the Q-axis current PI controller 234 is connected to an output terminal of the Q-axis voltage PI controller 232, a second input terminal of the Q-axis current PI controller 234 is connected to a Q-axis current output terminal, and an output terminal of the Q-axis current PI controller 234 is connected to the inverse coordinate transformation unit 222.
The D-axis current PI controller 233 takes the calculated value output from the D-axis voltage PI controller 231 as a D-axis reference current value i* dAnd D axis current value idAnd comparing, performing PI processing according to the comparison difference, and quantitatively transmitting the obtained calculation result to the inverse coordinate transformation unit 222 as a D axis control, so as to control the auxiliary power supply module 100. Similarly, the Q-axis current PI controller 234 takes the calculated value output by the Q-axis voltage PI controller 232 as the Q-axis reference current value i* qAnd Q axis current value iqAnd comparing, performing PI processing according to the comparison difference, and quantitatively transmitting the obtained calculation result to the inverse coordinate transformation unit 222 as Q-axis control, thereby controlling the auxiliary power supply module 100. With the structure, the function of current closed-loop control is realized in the aspect of a control system, the voltage closed loop is used as outer loop control, the current closed loop is used as inner loop control, the response speed is favorably improved, and the output power of the auxiliary power supply module 100 can be more quickly adjusted according to the voltage value and the current value of the alternating current.
The D-axis voltage PI controller 231, the D-axis current PI controller 233, the Q-axis voltage PI controller 232, and the Q-axis current PI controller 234 may be implemented by hardware, that is, may include common implementations of a comparator circuit, a proportional circuit, and an integrator circuit; the method can also be realized by a software mode, namely, a singlechip, an FPGA and other devices capable of performing calculation processing are used for performing comparison, proportion and integral operation on received signal values through a software program so as to simulate the processing of a PI controller, thereby obtaining an operation result.
Referring to fig. 2, in some embodiments of the present invention, the comparison operation unit 230 further includes a D-axis clipping unit 235 and a Q-axis clipping unit 236; the output end of the D-axis voltage PI controller 231 is connected with the input end of the D-axis amplitude limiting unit 235, the output end of the D-axis amplitude limiting unit 235 is connected with the first input end of the D-axis current PI controller 233, and the D-axis amplitude limiting unit 235 is used for limiting the output value of the D-axis voltage PI controller 231 within a preset range; the output end of the Q-axis voltage PI controller 232 is connected to the input end of the Q-axis amplitude limiting unit 236, the output end of the Q-axis amplitude limiting unit 236 is connected to the first input end of the Q-axis current PI controller 234, and the Q-axis amplitude limiting unit 236 is configured to limit the output value of the Q-axis voltage PI controller 232 within a preset range.
The output power of the auxiliary power supply module 100 needs to be within a proper range, by being provided with the D-axis amplitude limiting unit 235, the D-axis amplitude limiting unit 235 limits the output value of the D-axis voltage PI controller 231 within a preset range, and by being provided with the Q-axis amplitude limiting unit 236, the Q-axis amplitude limiting unit 236 limits the output value of the Q-axis voltage PI controller 232 within a preset range, so that the D-axis control fixed quantity and the Q-axis control fixed quantity which are subsequently transmitted to the inverse coordinate transformation unit 222 are also limited within a certain range, and further, the power output by the auxiliary power supply module 100 is limited within a certain range.
By providing the D-axis clipping unit 235, the auxiliary power supply module 100 can be limited to only provide active power to the wind farm, and the occurrence of power back-off can be limited. Preferably, the D-axis clipping unit 235 has a clipping range of 0 to 1p.u., and the Q-axis clipping unit 236 has a clipping range of-1 p.u. to +1p.u., where 1p.u. (per unit) is equal to the rated voltage value of the wind turbine.
Referring to fig. 2, in some embodiments of the present invention, the comparison operation unit 230 further includes a linking unit 237, an input terminal of the linking unit 237 is connected to an output terminal of the Q-axis voltage PI controller 232, an output terminal of the linking unit 237 is connected to a first input terminal of the Q-axis current PI controller 234, a control terminal of the linking unit 237 is connected to an output terminal of the D-axis PI voltage controller, and the linking unit 237 is configured to limit a range of an output value of the Q-axis voltage PI controller 232 according to the output value of the D-axis PI voltage controller.
After the wind driven generator is started and starts to generate power, the output values of the D-axis PI controller and the Q-axis PI controller are gradually reduced, and when the wind driven generator is started and starts to output power, the output values of the D-axis PI controller and the Q-axis PI controller are reduced to zero, so that the output current of the auxiliary power supply module 100 is reduced to zero and enters a standby state.
In order to avoid the problem of system oscillation during the switching of the auxiliary power supply module 100, the output of the Q-axis voltage PI controller 232 is also limited to zero when the output of the D-axis voltage PI controller 231 is zero. In contrast, by providing the interlocking unit 237, the interlocking unit 237 limits the output value range of the Q-axis voltage PI controller 232 according to the output value of the D-axis voltage PI controller 231, so that when the output of the D-axis voltage PI controller 231 is zero, the output of the Q-axis voltage PI controller 232 is also limited to zero.
The linkage unit 237 may multiply the output value of the D-axis voltage PI controller 231 by a preset coefficient as a clipping value, and the absolute value of the positive clipping value is the same as the absolute value of the negative clipping value.
Referring to fig. 1, in some embodiments of the present invention, the auxiliary power supply module 100 includes a power transmission line 120 and a power electronic device 110 or an on-load tap changer, an input end of the power electronic device 110 is connected to an external power grid or an external dc power transmission system, an input end of the on-load tap changer is connected to the external power grid, an output end of the power electronic device 110 or an output end of the on-load tap changer is connected to an external wind turbine through the power transmission line 120, and a control end of the power electronic device 110 or a control end of the on-load tap changer is connected to the feedback control module 200.
The power electronic device 110 obtains electric energy from a power grid or a direct current transmission system, processes and converts the electric energy to form alternating current suitable for assisting the wind driven generator in starting, and then transmits the alternating current to the wind driven generator through the transmission line 120 to assist the wind driven generator in starting. The power electronic device 110 obtains electric energy from a power grid or a direct current transmission system, and is more stable and reliable. The on-load voltage regulating transformer obtains alternating current from a power grid, and transmits the alternating current to the wind driven generator through the power transmission line 120 after voltage regulation processing is carried out on the alternating current. The power transmission line 120 may be an ac submarine cable, an overhead cable, or a cable, depending on the environment of use.
In some embodiments of the present invention, the power electronic device 110 includes a back-to-back converter, an input end of the back-to-back converter is connected to an external power grid, an output end of the back-to-back converter is connected to an external wind power generator through the power transmission line 120, and a control end of the back-to-back converter is connected to the feedback control module 200.
The back-to-back converter comprises a rectifying side and an inverting side, wherein the input end of the back-to-back converter, namely the rectifying side, is connected with a power grid so as to rectify alternating current of the power grid into direct current and transmit the direct current to the inverting side, and the inverting side inverts the direct current into the alternating current suitable for assisting the wind driven generator to start under the control of the feedback control module 200 and transmits the alternating current to the wind driven generator.
The back-to-back converter can be a back-to-back converter specific topological structure which comprises a common three-phase bridge rectifier circuit and a common three-phase bridge inverter circuit on a low-power occasion, wherein the three-phase bridge rectifier circuit is used as a rectification side and connected with a power grid, the three-phase bridge rectifier circuit outputs direct current to the three-phase bridge inverter circuit, and the three-phase bridge inverter circuit is used as an inversion side and connected with a wind driven generator; in high-power occasions, the modular multilevel converter can be of a structure comprising two groups of three-phase MMCs (modular multilevel) which are symmetrically arranged.
In some embodiments of the present invention, the power electronic device 110 includes an inverter, an input terminal of the inverter is connected to an external dc power transmission system, an output terminal of the inverter is connected to an external wind power generator through the power transmission line 120, and a control terminal of the inverter is connected to the feedback control module 200.
The offshore wind farm is incorporated into the power grid through the direct current transmission technology, namely, alternating current output by a wind driven generator in the offshore wind farm is processed and converted into direct current through a rectifying device, then the direct current is transmitted to an inversion device on land through a direct current submarine cable, and the inversion device converts the direct current into alternating current suitable for being incorporated into the power grid. Therefore, the inverter is connected with the direct current transmission system to obtain direct current, and the inverter inverts the direct current into alternating current suitable for assisting the wind driven generator in starting under the control of the feedback control module 200 and transmits the alternating current to the wind driven generator.
The inverter can be a three-phase bridge inverter circuit on a low-power occasion and can be a three-phase MMC structure on a high-power occasion.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (10)

1. Wind-powered electricity generation field starts supplementary power supply system, its characterized in that includes:
an auxiliary power supply module (100), wherein the auxiliary power supply module (100) can be connected with an external wind power generator, and the auxiliary power supply module (100) is used for generating alternating current for assisting the starting of the external wind power generator;
the power supply system comprises a feedback control module (200), wherein the input end of the feedback control module (200) is connected with the output end of the auxiliary power supply module (100), the output end of the feedback control module (200) is connected with the control end of the auxiliary power supply module (100), and the feedback control module (200) is used for adjusting the output voltage and/or current of the auxiliary power supply module (100).
2. Wind farm startup auxiliary power supply system according to claim 1, characterized in that: the feedback control module (200) comprises a detection unit (210) and a vector control unit (220), the detection unit (210) is connected with the output end of the auxiliary power supply module (100), the input end of the vector control unit (220) is connected with the detection unit (210), and the output end of the vector control unit (220) is connected with the auxiliary power supply module (100).
3. Wind farm startup auxiliary power supply system according to claim 2, characterized in that: the vector control unit (220) comprises a coordinate transformation unit (221), a comparison operation unit (230) and an inverse coordinate transformation unit (222), wherein the input end of the coordinate transformation unit (221) is connected with the detection unit (210), the coordinate transformation unit (221) is used for calculating a voltage value and/or a current value under a DQ coordinate system according to the voltage value and/or the current value of the alternating current, the output end of the coordinate transformation unit (221) is connected with the input end of the comparison operation unit (230), the comparison operation unit (230) is used for comparing the voltage value and/or the current value under the DQ coordinate system with a preset reference value to calculate a control constant, the output end of the comparison operation unit (230) is connected with the input end of the inverse coordinate transformation unit (222), the inverse coordinate transformation unit (222) is used for calculating a voltage control component and/or a current control component according to the control constant, the output end of the inverse coordinate transformation unit (222) is connected with the auxiliary power supply module (100) so that the auxiliary power supply module (100) adjusts the output voltage and/or current according to the voltage control component and/or the current control component.
4. A wind farm start-up auxiliary power supply system according to claim 3, characterized in that: the comparison operation unit (230) comprises a D-axis voltage PI controller (231) and a Q-axis voltage PI controller (232), and the coordinate transformation unit (221) is provided with a D-axis voltage output end and a Q-axis voltage output end; a first input end of the D-axis voltage PI controller (231) is connected with the detection unit (210) or the D-axis voltage output end, a second input end of the D-axis voltage PI controller (231) receives a first preset reference voltage value, and an output end of the D-axis voltage PI controller (231) is connected with the inverse coordinate transformation unit (222);
a first input end of the Q-axis voltage PI controller (232) is connected with the detection unit (210) or the Q-axis voltage output end, a second input end of the Q-axis voltage PI controller (232) receives a second preset reference voltage value, and an output end of the Q-axis voltage PI controller (232) is connected with the inverse coordinate transformation unit (222).
5. Wind farm startup auxiliary power supply system according to claim 4, characterized in that: the comparison operation unit (230) further comprises a D-axis current PI controller (233) and a Q-axis current PI controller (234), and the coordinate transformation unit (221) is provided with a D-axis current output end and a Q-axis current output end;
a first input end of the D-axis current PI controller (233) is connected with an output end of the D-axis voltage PI controller (231), a second input end of the D-axis current PI controller (233) is connected with the D-axis current output end, and an output end of the D-axis current PI controller (233) is connected with the inverse coordinate transformation unit (222);
a first input end of the Q-axis current PI controller (234) is connected with an output end of the Q-axis voltage PI controller (232), a second input end of the Q-axis current PI controller (234) is connected with the Q-axis current output end, and an output end of the Q-axis current PI controller (234) is connected with the inverse coordinate transformation unit (222).
6. Wind farm startup auxiliary power supply system according to claim 5, characterized in that: the comparison operation unit (230) further comprises a D-axis amplitude limiting unit (235) and a Q-axis amplitude limiting unit (236);
the output end of the D-axis voltage PI controller (231) is connected with the input end of the D-axis amplitude limiting unit (235), the output end of the D-axis amplitude limiting unit (235) is connected with the first input end of the D-axis current PI controller (233), and the D-axis amplitude limiting unit (235) is used for limiting the output value of the D-axis voltage PI controller (231) within a preset range;
the output end of the Q-axis voltage PI controller (232) is connected with the input end of the Q-axis amplitude limiting unit (236), the output end of the Q-axis amplitude limiting unit (236) is connected with the first input end of the Q-axis current PI controller (234), and the Q-axis amplitude limiting unit (236) is used for limiting the output value of the Q-axis voltage PI controller (232) within a preset range.
7. Wind farm startup auxiliary power supply system according to claim 5, characterized in that: the comparison operation unit (230) further comprises an interlocking unit (237), wherein the input end of the interlocking unit (237) is connected with the output end of the Q-axis voltage PI controller (232), the output end of the interlocking unit (237) is connected with the first input end of the Q-axis current PI controller (234), the control end of the interlocking unit (237) is connected with the output end of the D-axis voltage PI controller (231), and the interlocking unit (237) is used for limiting the output value range of the Q-axis voltage PI controller (232) according to the output value of the D-axis voltage PI controller (231).
8. Wind farm startup auxiliary power supply system according to any of the claims 1 to 7, characterized in that: the auxiliary power supply module (100) comprises a power transmission line (120) and power electronic equipment (110) or an on-load voltage regulating transformer, the input end of the power electronic equipment (110) is connected with an external power grid or an external direct-current power transmission system, the input end of the on-load voltage regulating transformer is connected with the external power grid, the output end of the power electronic equipment (110) or the output end of the on-load voltage regulating transformer passes through the power transmission line (120) and the external wind driven generator, and the control end of the power electronic equipment (110) or the control end of the on-load voltage regulating transformer is connected with the feedback control module (200).
9. Wind farm startup auxiliary power supply system according to claim 8, characterized in that: power electronic equipment (110) are including back to back the transverter, the input and the outside electric wire netting of back to back the transverter are connected, the output of back to back the transverter passes through transmission line (120) are connected with outside aerogenerator, the control end of back to back the transverter with feedback control module (200) are connected.
10. Wind farm startup auxiliary power supply system according to claim 8, characterized in that: the power electronic equipment (110) comprises an inverter, the input end of the inverter is connected with an external direct-current transmission system, the output end of the inverter is connected with an external wind driven generator through the power transmission line (120), and the control end of the inverter is connected with the feedback control module (200).
CN202010707522.0A 2020-07-21 2020-07-21 Wind power plant starting auxiliary power supply system Pending CN111817346A (en)

Priority Applications (1)

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CN202010707522.0A CN111817346A (en) 2020-07-21 2020-07-21 Wind power plant starting auxiliary power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010707522.0A CN111817346A (en) 2020-07-21 2020-07-21 Wind power plant starting auxiliary power supply system

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