CN114530895A - AC fault control method and control system for double-fed wind power hybrid DC output system - Google Patents

AC fault control method and control system for double-fed wind power hybrid DC output system Download PDF

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Publication number
CN114530895A
CN114530895A CN202011224075.XA CN202011224075A CN114530895A CN 114530895 A CN114530895 A CN 114530895A CN 202011224075 A CN202011224075 A CN 202011224075A CN 114530895 A CN114530895 A CN 114530895A
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wind
power
active power
generating set
ref
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朱龙臻
平明丽
杨美娟
王先为
吴金龙
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State Grid Corp of China SGCC
Xuji Group Co Ltd
State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
Xuji Group Co Ltd
State Grid Jiangsu Electric Power Co Ltd
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Priority to CN202011224075.XA priority Critical patent/CN114530895A/en
Publication of CN114530895A publication Critical patent/CN114530895A/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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • 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
    • 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
    • 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 relates to a method and a system for controlling alternating current faults of a double-fed wind power hybrid direct current output system, which are implemented by modifying and optimizing an active power outer ring, when an alternating current fault occurs, the actual power instruction value of the wind generating set can quickly follow the output power of the grid-connected point, when the alternating current fault is cleared, the actual power command value of the wind generating set is gradually restored to the power command value before the fault with a certain slope, meanwhile, the switching of the low-voltage fault ride-through link and the conventional active power control link is smoothly processed, after the fault is cleared, the wind generating set can stably and gradually recover the output, reduce the power impact on the MMC and leave sufficient regulation time for the MMC, avoid the MMC from generating serious surplus power during the recovery period of the alternating current fault, and further, the voltage of the submodule rises, and serious overvoltage occurs on the direct current side and the alternating current side.

Description

AC fault control method and control system for double-fed wind power hybrid DC output system
Technical Field
The invention relates to the technical field of hybrid direct-current power transmission, in particular to a method and a system for controlling alternating-current faults of a double-fed wind power hybrid direct-current sending system.
Background
Under the global large background that fossil energy is increasingly exhausted, increasing the utilization of renewable energy is an important means for energy conservation and emission reduction, and from the global scope, wind power generation is the most mature in the development and utilization of renewable energy and has the most large-scale development condition.
The wind energy resources in China are totally rich, but the wind energy is mainly concentrated in the northwest and northeast regions, the power load is mainly concentrated in the middle and the eastern regions, and the imbalance of the resource and load distribution causes that the electric energy converted from the wind energy in China needs to be transferred in a large range and across regions. The hybrid direct-current transmission technology is a new transmission mode combining a conventional direct-current transmission technology and a flexible direct-current transmission technology, the hybrid modes can be divided into inter-pole mixing, inter-pole mixing and intra-pole mixing according to different system structures, different system structures are suitable for different application scenes, and the intra-pole hybrid mode is suitable for transmitting electric energy of a large-scale wind power base. Taking a single pole as an example, a structural schematic diagram of an intra-pole hybrid direct current transmission system is shown in fig. 1, and the system has the characteristics of multiple power supplies and multiple power receiving points. The hybrid direct current power transmission system has the following advantages: (1) the thyristor of the switching device in the receiving end LCC has unidirectional conductivity and has the advantage of natural isolation of direct current faults, and the low valve group MMC can be protected from overcurrent after the direct current line faults occur; (2) the receiving end can realize power supply of a plurality of load centers, the evacuation pressure of an alternating current power grid of the receiving end is relieved, and meanwhile, when the LCC of the receiving end fails to transmit power in a commutation mode, the MMC of the low valve group can still transmit partial power, so that the impact on the alternating current power grid is reduced; (3) the sending end low valve bank is connected with the MMC in parallel, so that the electric energy of a single or a plurality of new energy bases can be sent out.
The current mainstream wind generating set model is a double-fed induction wind generating set, the structural schematic diagram is shown in fig. 2, the control strategies of the two converters adopt double closed-loop control with mature technology, the inner loop is a current loop, and the outer loop is a power loop. The main functions of the grid-side converter are to maintain the voltage stability of a direct-current bus and control the power factor of a grid-connected point; the main function of the machine side converter is to receive a power instruction issued by the wind power plant controller, control the rotor current by adjusting the output voltage of the converter, and further control the output power of the grid-connected point.
For a double-fed wind power base hybrid direct current sending system, a low valve set MMC provides grid-connected voltage for a wind power plant, so that a constant alternating current voltage control mode is adopted, and the alternating current voltage of a grid-connected point of the wind power plant is directly related to the amplitude value of an MMC modulation wave and the capacitance voltage of a submodule. The wind power plant grid-connected output line generally adopts an overhead transmission line, is greatly influenced by the environment and is easy to generate temporary AC faults, the voltage of a wind power plant grid-connected AC system is reduced after the faults occur, the wind power plant enters a low-voltage ride-through mode after detecting the reduction of the voltage of a grid-connected point, fig. 3 shows a schematic diagram of a power outer ring structure of a machine side converter in the prior art, and as shown in fig. 3, a power outer ring of the machine side converter in a double-fed wind power generator set is subjected to control link switching and compensates certain power for the grid-connected AC system according to related national standards. However, the output power of the wind power plant is blocked during the fault period, the active power controller can generate a saturation phenomenon without any treatment, after the fault is cleared and the alternating-current voltage of the grid-connected point of the wind power plant is normally established, the saturation of the controller can cause the output power of the wind power plant to generate power step, the power rapidly rises and generates overshoot, the low valve group MMC generates sufficient power, the voltage of the submodule rises, the overvoltage phenomenon occurs on the direct-current side and the alternating-current side, and the risk of damaging equipment and causing fan grid disconnection due to overhigh voltage of the grid-connected point of the wind power plant exists.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide an alternating current fault control method and a control system for a double-fed wind power hybrid direct current sending system, by optimizing and transforming an active power outer ring of a machine side converter in a double-fed wind generating set, the wind generating set can stably and gradually recover original power transmission after fault clearing, power impact on an MMC is reduced, sufficient regulation time is reserved for the MMC, and the phenomena that the voltage of a submodule rises and severe overvoltage occurs on a direct current side and an alternating current side due to severe surplus power of the MMC during alternating current fault are avoided.
In order to achieve the above object, according to one aspect of the present invention, there is provided an ac fault control method for a double-fed wind power hybrid dc output system, the control method comprising an active power outer loop control link and a current loop inner loop control link, the active power outer loop control link comprising a conventional power control link and a low voltage fault ride-through control link,
when the fault of the alternating current side of the double-fed wind generating set occurs, setting a low-voltage fault detection signal Sig to be 0, and outputting an inner-loop current instruction value by a low-voltage fault ride-through control link according to a preset control algorithm;
when the fault on the alternating current side of the double-fed wind generating set is cleared, setting a low-voltage fault detection signal Sig to be 1, and outputting an inner loop current instruction value by a conventional power control link according to a preset control algorithm;
and when the low-voltage fault detection signal Sig is changed from 1 to 0 or from 0 to 1, the actual active power command value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe assignment source of (2) is switched.
Further, when the low-voltage fault detection signal Sig is changed from 1 to 0, the actual active power instruction value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe switching of the assignment source comprises that the wind power plant controller issues an active power instruction value P of the wind power generator set according to the scheduling instructionwind_refSwitching to actual output active power P of grid-connected point of wind generating setwind。
Further, when the low voltage is appliedWhen the fault detection signal Sig is changed from 0 to 1, the actual active power instruction value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe switching of the assignment source comprises that the wind generating set grid-connected point actually outputs active power PwindSwitching to an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_ref。
Further, when the low-voltage fault detection signal Sig changes from 0 to 1, the integral term of the controller in the conventional power control link is reset to the current inner-loop current command value.
Further, the conventional power control link comprises a ramp processing link, and the ramp processing link is used for processing the actual active power instruction value P of the wind generating setwind_ref_realThe assignment source of (2) is processed.
According to another aspect of the invention, an alternating current fault control system of a double-fed wind power hybrid direct current output system is provided, wherein the control system comprises an active power outer loop control module and a current loop inner loop control module, and the active power outer loop control module comprises a conventional power control module and a low voltage fault ride-through control module; wherein,
when a double-fed wind generating set alternating current side fault occurs and a low voltage fault detection signal Sig is 0, the low voltage fault ride-through control module outputs an inner loop current instruction value to the current loop inner loop control module according to a preset control algorithm;
when the fault of the alternating current side of the double-fed wind generating set is eliminated and the low-voltage fault detection signal Sig is 1, the conventional power control module outputs an inner loop current instruction value to the current loop inner loop control module according to a preset control algorithm; and when the low-voltage fault detection signal Sig is changed from 1 to 0 or from 0 to 1, the actual active power command value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe assignment source of (2) is switched.
Further, the conventional power control module, when the low voltage fault detection signal Sig changes from 1 to 0, wind power generation in the conventional power control moduleActual active power instruction value P of motor groupwind_ref_realThe assignment source is an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_refSwitching to actual output active power P of grid-connected point of wind generating setwind。
Further, when the low-voltage fault detection signal Sig changes from 0 to 1, the actual active power command value P of the wind generating set in the conventional power control modulewind_ref_realThe assignment source of the grid-connected point of the wind generating set actually outputs active power PwindSwitching to an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_ref。
Further, when the low-voltage fault detection signal Sig changes from 0 to 1, the integral term of the controller in the conventional power control module is reset to the current inner-loop current command value.
Further, the conventional power control module further comprises a ramp processing module;
the slope processing module is used for processing the actual active power instruction value P of the wind generating setwind_ref_realThe assignment source of (2) performs processing.
In summary, the present invention provides a method and a system for controlling an ac fault of a double-fed wind power hybrid dc output system, which are based on the original control architecture of a machine-side converter in a double-fed wind turbine generator system, by modifying and optimizing an active power outer loop, after an ac fault occurs, an actual power instruction value of the wind turbine generator system can quickly follow the output power of a grid-connected point thereof, so that a conventional power control loop controller does not saturate during the fault, after the ac fault is cleared, the actual power instruction value of the wind turbine generator system gradually recovers to a pre-fault power instruction value with a certain slope, and meanwhile, the switching between a low-voltage fault ride-through link and a conventional active power control link is smoothed, so that after the fault is cleared, the wind turbine generator system can stably and gradually recover the output power, reduce the power impact on an MMC, and leave sufficient adjustment time for the MMC, the phenomenon that serious power surplus occurs to the MMC during AC fault recovery, so that the voltage of the submodule rises, and serious overvoltage occurs to a DC side and an AC side is avoided.
Drawings
FIG. 1 is a schematic diagram of a prior art intra-pole hybrid DC power transmission system;
FIG. 2 is a schematic structural diagram of a prior art doubly-fed induction wind power plant;
FIG. 3 is a schematic diagram of a power outer loop structure of a machine side converter in the prior art;
FIG. 4 is a schematic diagram of a modified power outer loop structure of the machine-side converter of the present invention;
FIG. 5 is a flow chart of the AC fault control method of the double-fed wind power hybrid DC output system of the present invention;
FIG. 6 is a schematic structural diagram of an AC fault control system of the double-fed wind power hybrid DC output system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It is to be understood that these descriptions are only illustrative and are not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. Aiming at the power outer loop control method of the machine side converter in the prior art, the output power of a wind power plant is blocked during a fault period, an active power controller is not subjected to any treatment, a saturation phenomenon occurs, after the fault is cleared and the alternating-current voltage of a grid connection point of the wind power plant is normally established, the saturation of the controller causes the output power of the wind power plant to have a power step, the power rapidly rises and overshoots are generated, a low valve group MMC has sufficient power, the voltage of a submodule rises, the overvoltage phenomenon occurs on a direct-current side and an alternating-current side, equipment is damaged, and the grid connection point voltage of the wind power plant is too high, so that a fan is out of a grid. Therefore, the invention improves the outer loop control methodThe schematic diagram of the active power outer ring control of the machine side converter after construction is shown in fig. 4, and on the basis of not changing the original control strategy architecture of the double-fed wind generating set, the active power outer ring is optimized and modified, and an instruction value switching link, a slope processing link and a controller resetting operation are added. Pwind_ref_realFrom Pwind_refOr PwindAssign a value, and at Pwind_ref_realFrom Pwind_refOr PwindWhen assignment is carried out, a slope processing link is added, the slope processing link has the characteristics of high descending speed and low ascending speed, and P is caused by blocked output power of the wind generating set after an alternating current fault occurs after a fault detection signal Sig is set to be 0windDecrease of Pwind_ref_realShould be rapidly reduced to PwindLet the input of the controller be 0, and after the fault detection signal Sig is set to 1, it indicates that the AC fault has been cleared, at this time Pwind_ref_realRestoring to the active power instruction value P issued according to the scheduling instruction in response to the rampwind_refThe wind turbine generator gradually recovers output, and the speed of the slope processing link can be set adaptively according to specific conditions. When the fault detection signal Sig is set to 1 from 0, the integral term of the controller in the conventional control link is reset to be the current inner loop current instruction value, and the method can realize smooth switching between the low voltage ride through control link and the conventional power control link after fault clearing, so that the stable output recovery of the wind generating set is ensured. Based on the above principle, according to an embodiment of the present invention, a method for controlling an ac fault of a double-fed wind power hybrid dc output system is provided, where a flowchart of the control method is shown in fig. 5, the control method includes an active power outer loop control link and a current loop inner loop control link, and the active power outer loop control link includes a conventional power control link and a low voltage fault ride through control link. When the fault of the alternating current side of the double-fed wind generating set occurs, setting a low-voltage fault detection signal Sig to be 0, and outputting an inner-loop current instruction value by a low-voltage fault ride-through control link according to a preset control algorithm; when the fault of the alternating current side of the double-fed wind generating set is cleared, a low-voltage fault detection signal Sig is set to be 1, and a conventional power control link carries out control according to a preset control algorithmAnd outputting the inner loop current instruction value. When the low-voltage fault detection signal Sig is changed from 1 to 0, the actual active power instruction value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe assignment source of (2) is switched: the wind power plant controller issues an active power instruction value P of the wind power generator set according to the scheduling instructionwind_refSwitching to actual output active power P of grid-connected point of wind generating setwind. When the low-voltage fault detection signal Sig is changed from 0 to 1, the actual active power instruction value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe assignment source of (2) is switched: actual output active power P of grid-connected point of wind generating setwindSwitching to an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_ref。
According to another embodiment of the invention, a structural schematic diagram of an alternating current fault control system of a double-fed wind power hybrid direct current output system is provided as shown in fig. 6, the control system comprises an active power outer loop control module and a current loop inner loop control module, and the active power outer loop control module comprises a conventional power control module and a low voltage fault ride-through control module. When a double-fed wind generating set alternating current side fault occurs and a low voltage fault detection signal Sig is 0, the low voltage fault ride-through control module outputs an inner ring current instruction value to the current ring inner ring control module according to a preset control algorithm; and when the fault of the alternating current side of the double-fed wind generating set is eliminated and the low-voltage fault detection signal Sig is 1, the conventional power control module outputs an inner loop current instruction value to the current loop inner loop control module according to a preset control algorithm. When the low-voltage fault detection signal Sig is changed from 1 to 0, the actual active power command value P of the wind generating set in the conventional power control modulewind_ref_realThe assignment source is an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_refSwitching to actual output active power P of grid-connected point of wind generating setwind. The normal power control module is set to the low stateWhen the voltage fault detection signal Sig is changed from 0 to 1, the actual active power command value P of the wind generating set in the conventional power control modulewind_ref_realThe evaluation source is the actual output active power P of the grid-connected point of the wind generating setwindSwitching to an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_ref. And when the low-voltage fault detection signal Sig is changed from 0 to 1, the integral term of the controller in the conventional power control module is reset to the current inner-loop current instruction value. The conventional power control module also comprises a slope processing module for processing the actual active power instruction value P of the wind generating setwind_ref_realThe assignment source of (2) is processed.
In summary, the invention relates to an ac fault control method and a control system for a double-fed wind power hybrid dc output system, which is implemented by modifying and optimizing an active power outer loop without changing an original control architecture of a machine-side converter in a double-fed wind turbine generator system, after an ac fault occurs, an actual power instruction value of the wind turbine generator system can quickly follow output power of a grid-connected point of the wind turbine generator system, so that a conventional power control loop controller does not saturate during the fault, after the ac fault is cleared, the actual power instruction value of the wind turbine generator system is gradually restored to a power instruction value before the fault with a certain slope, and meanwhile, the switching of a low-voltage fault ride-through link and a conventional active power control link is smoothly processed, so that the wind turbine generator system can stably and gradually restore output power after the fault is cleared, power impact on an MMC is reduced, and sufficient adjustment time is left for the MMC, the phenomena that the voltage of a submodule rises and serious overvoltage occurs on a direct current side and an alternating current side due to the fact that the MMC has serious surplus power during alternating current fault recovery are avoided.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (10)

1. A double-fed wind power mixed DC output system AC fault control method comprises an active power outer loop control link and a current loop inner loop control link, wherein the active power outer loop control link comprises a conventional power control link and a low voltage fault ride-through control link,
when the double-fed wind generating set alternating current side fault occurs, setting a low-voltage fault detection signal Sig to be 0, and outputting an inner loop current instruction value by a low-voltage fault ride-through control link according to a preset control algorithm;
when the fault of the alternating current side of the double-fed wind generating set is cleared, setting a low-voltage fault detection signal Sig to be 1, and outputting an inner-loop current instruction value by a conventional power control link according to a preset control algorithm;
and when the low-voltage fault detection signal Sig is changed from 1 to 0 or from 0 to 1, the actual active power command value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe assignment source of (2) is switched.
2. The control method according to claim 1, wherein when the low voltage fault detection signal Sig changes from 1 to 0, the actual active power command value P is set for the wind turbine generator in the conventional power control linkwind_ref_realThe switching of the assignment source comprises that the wind power plant controller issues an active power instruction value P of the wind power generator set according to the scheduling instructionwind_refSwitching to actual output active power P of grid-connected point of wind generating setwind。
3. The control method according to claim 1, wherein when the low voltage fault detection signal Sig changes from 0 to 1, the actual active power command value P for the wind turbine generator set in the conventional power control link is setwind_ref_realAssigned value source ofThe line switching comprises that the wind generating set grid-connected point actually outputs active power PwindSwitching to an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_ref。
4. The control method according to claim 3, wherein when the low-voltage fault detection signal Sig changes from 0 to 1, the integral term of the controller in the conventional power control link is reset to the current inner-loop current command value.
5. The control method according to claim 2 or 4, wherein the regular power control link comprises a ramp processing link, and the ramp processing link is used for processing an actual active power command value P of the wind generating setwind_ref_realThe assignment source of (2) is processed.
6. An alternating current fault control system of a double-fed wind power hybrid direct current sending system is characterized in that the control system comprises an active power outer loop control module and a current loop inner loop control module, wherein the active power outer loop control module comprises a conventional power control module and a low-voltage fault ride-through control module; wherein,
when a double-fed wind generating set alternating current side fault occurs and a low voltage fault detection signal Sig is 0, the low voltage fault ride-through control module outputs an inner loop current instruction value to the current loop inner loop control module according to a preset control algorithm;
when the fault of the alternating current side of the double-fed wind generating set is eliminated and the low-voltage fault detection signal Sig is 1, the conventional power control module outputs an inner loop current instruction value to the current loop inner loop control module according to a preset control algorithm; and when the low-voltage fault detection signal Sig is changed from 1 to 0 or from 0 to 1, the actual active power command value P of the wind generating set in the conventional power control link is subjected towind_ref_realThe assignment source of (2) is switched.
7. The method of claim 6The control system of (1), wherein the normal power control module changes the actual active power command value P of the wind turbine generator in the normal power control module when the low voltage fault detection signal Sig changes from 1 to 0wind_ref_realThe assignment source is an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_refSwitching to actual output active power P of grid-connected point of wind generating setwind。
8. The control system of claim 6, wherein the normal power control module changes the actual active power command value P of the wind turbine generator set in the normal power control module when the low voltage fault detection signal Sig changes from 0 to 1wind_ref_realThe evaluation source is the actual output active power P of the grid-connected point of the wind generating setwindSwitching to an active power instruction value P of the wind power generator set issued by the wind power plant controller according to the scheduling instructionwind_ref。
9. The control system of claim 8, wherein the regular power control module resets the integral term of the controller to the present inner loop current command value when the low voltage fault detection signal Sig changes from 0 to 1.
10. The control system of claim 7 or 9, wherein the regular power control module further comprises a ramp module;
the slope processing module is used for processing the actual active power instruction value P of the wind generating setwind_ref_realThe assignment source of (2) is processed.
CN202011224075.XA 2020-11-05 2020-11-05 AC fault control method and control system for double-fed wind power hybrid DC output system Pending CN114530895A (en)

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CN202011224075.XA CN114530895A (en) 2020-11-05 2020-11-05 AC fault control method and control system for double-fed wind power hybrid DC output system

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