CN113488964B - System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity - Google Patents
System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity Download PDFInfo
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- CN113488964B CN113488964B CN202110853093.2A CN202110853093A CN113488964B CN 113488964 B CN113488964 B CN 113488964B CN 202110853093 A CN202110853093 A CN 202110853093A CN 113488964 B CN113488964 B CN 113488964B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/228—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for covered wires or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
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- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a system and a method for protecting a high-speed permanent magnet wind driven generator and an outgoing cable by electric quantity, wherein branch lines of each phase at the neutral side of the high-speed permanent magnet generator are combined and then are connected with a neutral point through a generator neutral point zero sequence current transformer, the output end of the high-speed permanent magnet generator is connected with the input end of a full-power converter through a converter side phase current transformer, the output end of the full-power converter is connected with a converter network side circuit breaker, the generator neutral point side phase current transformer is arranged on each branch line of the neutral point of the high-speed permanent magnet generator, and a dynamic protection and zero sequence grounding protection device is connected with the converter side phase current transformer, the generator neutral point zero sequence current transformer and the converter network side circuit breaker.
Description
Technical Field
The invention belongs to the technical field of relay protection of new energy wind turbine generators, and relates to a system and a method for protecting a high-speed permanent magnet wind turbine generator and an outgoing cable by electric quantity.
Background
At present, a variable-speed variable-pitch wind generating set applies a variable pitch technology and a variable-speed constant-frequency technology, and the rotating speed of a wind wheel can be adjusted according to the change of wind speed so as to absorb the energy of wind to the maximum extent and improve the conversion efficiency. The permanent magnet generator system is a wind power generation system taking a permanent magnet generator and a full-power converter 3 as cores, a unit is connected with a high-voltage power grid through a full-power frequency converter and a transformer, and the frequency converter converts alternating current with constantly changing voltage and frequency output by the unit into direct current and then inversely into power frequency alternating current capable of being connected to the grid.
The wind power generation technology is continuously developed, the capacity of a wind power generator and the transmission capacity and the length of a generator outgoing cable 2 are correspondingly increased, the short circuit capacity is further increased when the unit has an electrical fault, and serious consequences are brought if fault equipment is not accurately, sensitively and effectively removed, especially for the wind power generator units far away from a centralized control center, such as a sea wind power generator unit. GB/T19960.1 part I of wind generating set: in general technical conditions, protection of a generator and a generator outgoing cable of a wind generating set is realized based on a control system of the set, and the protection mainly comprises over-temperature protection of the generator, cable over-winding protection, over-current protection, over-voltage protection, over-power protection and instantaneous over-power protection. When the generator and the outgoing cable of the generator have electrical faults, overcurrent protection (a converter network side and a converter side) cannot be accurately judged, and overvoltage protection, overpower protection and instantaneous overpower protection of overtemperature protection (a bearing and a winding) of the generator cannot be timely and effectively judged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for protecting a high-speed permanent magnet wind driven generator and an outlet cable by electric quantity, which can judge the fault type, remove the fault and emergently stop when the generator and the outlet cable of the generator have electrical faults.
In order to achieve the purpose, the system for protecting the high-speed permanent magnet wind driven generator and the outgoing cable by the electric quantity comprises a high-speed permanent magnet generator, a full-power converter, a generator neutral point side phase current transformer, a generator neutral point zero sequence current transformer, a converter side phase current transformer, a generator terminal voltage transformer, a differential protection and zero sequence grounding protection device and a converter network side circuit breaker;
the dynamic protection and zero sequence grounding protection device is connected with the current transformer side phase current transformer, the generator neutral point zero sequence current transformer and the converter network side circuit breaker.
The output end of the high-speed permanent magnet generator is connected with the input end of the full-power converter through a generator outgoing cable and a converter side phase current transformer.
The electric fault occurring between the generator neutral point side phase current transformer and the converter side phase current transformer in the protection range is one or a combination of a plurality of high-speed permanent magnet generator three-phase short circuit faults, high-speed permanent magnet generator two-phase short circuit faults, generator outgoing line cable three-phase short circuit faults and generator outgoing line cable two-phase short circuit faults.
The electric faults of the high-speed permanent magnet generator and the generator outgoing cable in the protection range of the generator neutral point zero sequence current transformer are one or a combination of a high-speed permanent magnet generator two-phase short circuit ground fault, a high-speed permanent magnet generator single-phase ground fault, a generator outgoing cable two-phase short circuit ground fault and a generator outgoing cable single-phase ground fault.
The switching value collected by the differential protection and zero sequence grounding protection device comprises a zero position signal of the variable pitch device and a running signal of the converter.
The analog quantity parameters collected by the differential protection and zero sequence grounding protection device comprise the side phase current of the neutral point of the generator, the side phase current of the converter, the zero sequence current of the neutral point of the generator, the terminal voltage of the generator and the frequency of the generator.
The trip outlets of the differential protection and zero sequence ground protection devices include an outlet to the safety chain device, to the converter grid side breaker outlet and to the converter outlet.
A method for protecting a high-speed permanent magnet wind driven generator and an outgoing cable by electric quantity comprises the following steps:
during the operation of the high-speed permanent magnet generator, the differential protection and zero sequence grounding protection device judges whether two-phase short circuit grounding faults of the high-speed permanent magnet generator, single-phase grounding faults of the high-speed permanent magnet generator, two-phase short circuit grounding faults of outgoing cables of the generator, single-phase grounding faults of outgoing cables of the generator, three-phase short circuit faults of the outgoing cables of the generator, two-phase short circuit faults of outgoing cables of the generator, three-phase short circuit faults of outgoing cables of the generator, two-phase short circuit faults of outgoing cables of the generator and two-phase short circuit faults of outgoing cables of the generator occur according to a zero position signal of a variable pitch device, a converter operation signal, neutral point side phase current of the generator, side phase current of the converter, zero sequence current of a neutral point of the generator, terminal voltage of the generator and frequency of the generator, and when two-phase short circuit grounding faults of outgoing cables of the high-speed permanent magnet generator, single-phase short circuit grounding faults of outgoing cables of the generator, three-phase short circuit faults of outgoing cables of the high-speed permanent magnet generator, two-phase short circuit faults of outgoing cables of the high-speed permanent magnet generator, tripping an outlet, triggering a safety chain action and tripping a breaker on the side of a converter.
The invention has the following beneficial effects:
when the system and the method for protecting the high-speed permanent magnet wind driven generator and the outgoing cable by the electrical quantity are in specific operation, the three-phase short-circuit fault, the two-phase short-circuit fault and the grounding fault of the generator are accurately judged by collecting the phase current of the neutral point of the high-speed permanent magnet wind driven generator, the side current of the converter and the zero-sequence current of the neutral point, and meanwhile, when the fault occurs, the network side circuit breaker of the converter is disconnected, the emergency stop is carried out, the purpose of removing the fault is achieved, and the loss of electrical equipment in the fault process is reduced.
Drawings
FIG. 1 is a schematic diagram of a high speed permanent magnet wind turbine and an outgoing cable according to the prior art;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a logic diagram of the differential protection (quick disconnect) of the present invention;
FIG. 4 is a logic diagram of the differential protection (ratio differential) of the present invention;
fig. 5 is a logic diagram of the ground protection of the present invention.
The system comprises a high-speed permanent magnet generator 1, a generator outgoing cable 2, a full-power converter 3, a generator neutral point side phase current transformer 4, a generator neutral point zero sequence current transformer 5, a converter side phase current transformer 6, a generator terminal voltage transformer 7, a differential protection and zero sequence grounding protection device 8 and a converter network side circuit breaker 9.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and do not limit the scope of the disclosure 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 disclosure. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1 and 2, the system for protecting a high-speed permanent magnet wind power generator and an outgoing cable by an electrical quantity according to the present invention includes a high-speed permanent magnet generator 1, a generator outgoing cable 2, a full-power converter 3, a generator neutral point side phase current transformer 4, a generator neutral point zero sequence current transformer 5, a converter side phase current transformer 6, a generator terminal voltage transformer 7, a differential protection and zero sequence grounding protection device 8 and a converter network side circuit breaker 9;
the neutral side branch lines of the high-speed permanent magnet generator 1 are combined and then connected with a neutral point through a generator neutral point zero sequence current transformer 5, the output end of the high-speed permanent magnet generator 1 is connected with the input end of a full-power converter 3 through a generator outgoing line cable 2 and a converter side phase current transformer 6, the output end of the full-power converter 3 is connected with a converter grid side circuit breaker 9, a generator neutral point side phase current transformer 4 is installed on each phase branch line of the neutral point of the high-speed permanent magnet generator 1, and a dynamic protection and zero sequence grounding protection device 8 is connected with the converter side phase current transformer 6, the generator neutral point side phase current transformer 4, the generator neutral point zero sequence current transformer 5 and the converter grid side circuit breaker 9.
The electrical fault occurring between the generator neutral point side phase current transformer 4 and the converter side phase current transformer 6 in the protection range is one or a combination of a three-phase short-circuit fault of the high-speed permanent magnet generator 1, a two-phase short-circuit fault of the high-speed permanent magnet generator 1, a three-phase short-circuit fault of the generator outgoing cable 2 and a two-phase short-circuit fault of the generator outgoing cable 2.
The electric faults of the high-speed permanent magnet generator 1 and the generator outgoing cable 2 in the protection range of the generator neutral point zero sequence current transformer 5 are one or a combination of multiple of a two-phase short circuit grounding fault of the high-speed permanent magnet generator 1, a single-phase grounding fault of the high-speed permanent magnet generator 1, a two-phase short circuit grounding fault of the generator outgoing cable 2 and a single-phase grounding fault of the generator outgoing cable 2.
The differential protection and zero sequence grounding protection device 8 collects generator neutral point side phase current, converter side phase current, generator neutral point zero sequence current, generator terminal voltage and generator frequency, the switching value collected by the differential protection and zero sequence grounding protection device 8 comprises a variable pitch device zero position signal and a converter operation signal, and the tripping outlet of the differential protection and zero sequence grounding protection device 8 comprises an outlet to a safety chain device, an outlet to a converter network side circuit breaker 9 and an outlet to a converter.
During the operation period of the high-speed permanent magnet generator 1, the differential protection and zero sequence grounding protection device 8 judges whether two-phase short circuit grounding faults of the high-speed permanent magnet generator 1, single-phase grounding faults of the high-speed permanent magnet generator 1, two-phase short circuit grounding faults of a generator outgoing cable 2, single-phase grounding faults of a generator outgoing cable 2, three-phase short circuit faults of the high-speed permanent magnet generator 1, two-phase short circuit faults of the high-speed permanent magnet generator 1, three-phase short circuit faults of the generator outgoing cable 2 and two-phase short circuit faults of the generator outgoing cable 2 occur or not according to a zero position signal of a pitch control device, a converter operation signal, neutral point side phase current of the generator, generator neutral point zero sequence current, generator terminal voltage and generator frequency, when two-phase short circuit ground fault of the high-speed permanent magnet generator 1, single-phase ground fault of the high-speed permanent magnet generator 1, two-phase short circuit ground fault of the generator outgoing cable 2, single-phase ground fault of the generator outgoing cable 2, three-phase short circuit fault of the high-speed permanent magnet generator 1, two-phase short circuit fault of the high-speed permanent magnet generator 1, three-phase short circuit fault of the generator outgoing cable 2 or two-phase short circuit fault of the generator outgoing cable 2 occur, a tripping outlet is started, a safety chain is triggered to act, and the converter network side circuit breaker 9 is tripped.
Referring to fig. 3, when a short-circuit fault occurs between the generator neutral point side phase current transformer 4 and the converter side phase current transformer 6, the currents on both sides are unbalanced, differential protection is performed, a start-up exit without delay is protected, a safety chain is performed, emergency shutdown is performed, rapid slurry and braking are performed, the short-circuit current provided by the high-speed permanent magnet generator 1 is rapidly cut off, the converter is locked, and the converter grid side circuit breaker 9 is disconnected.
As shown in fig. 4, when a fault occurs in which short-circuit current is large between the generator neutral-point-side phase current transformer 4 and the converter-side phase current transformer 6, the rate differential protection operates, the protection outlet time is delayed by about ten milliseconds from the differential disconnection, and the outlet mode is the same as the differential disconnection protection.
As shown in fig. 5, when the high-speed permanent magnet generator 1 operates normally, the zero-sequence current of the neutral point of the generator is detected, and when the zero-sequence current of the neutral point of the generator is less than or equal to a fixed value, the protection is not operated; when the grounding fault occurs in the generator, the generator and the outgoing cable thereof, the zero sequence current of the neutral point of the generator is larger than a fixed value, and then the protection action starts the safety chain action, the converter quits the operation and the converter grid-side circuit breaker 9 is tripped after the second-level time delay.
According to the invention, the generator neutral point phase current, the converter side current and the neutral point zero sequence current of the high-speed permanent magnet generator 1 are acquired, so that the faults of the high-speed permanent magnet generator 1 and the outgoing cable are accurately reflected, the faults are quickly removed, and the safety of equipment is protected to the greatest extent.
Claims (2)
1. A system for protecting a high-speed permanent magnet wind driven generator and an outgoing cable by electric quantity is characterized by comprising a high-speed permanent magnet generator (1), a full-power converter (3), a generator neutral point side phase current transformer (4), a generator neutral point zero sequence current transformer (5), a converter side phase current transformer (6), a generator terminal voltage transformer (7), a differential protection and zero sequence grounding protection device (8) and a converter network side circuit breaker (9);
the neutral side branch lines of the high-speed permanent magnet generator (1) are merged and then are connected with a neutral point through a generator neutral point zero sequence current transformer (5), the output end of the high-speed permanent magnet generator (1) is connected with the input end of a full-power converter (3) through a converter side phase current transformer (6), the output end of the full-power converter (3) is connected with a converter network side circuit breaker (9), the generator neutral point side phase current transformer (4) is installed on each phase branch line of the neutral point of the high-speed permanent magnet generator (1), and a dynamic protection and zero sequence grounding protection device (8) is connected with the converter side phase current transformer (6), the generator neutral point side phase current transformer (4), the generator neutral point zero sequence current transformer (5) and the converter network side circuit breaker (9);
the output end of the high-speed permanent magnet generator (1) is connected with the input end of the full-power converter (3) through a generator outgoing cable (2) and a converter side phase current transformer (6);
the electric fault occurring between the generator neutral point side phase current transformer (4) and the converter side phase current transformer (6) in the protection range is one or a combination of a plurality of high-speed permanent magnet generator (1) three-phase short circuit fault, high-speed permanent magnet generator (1) two-phase short circuit fault, generator outgoing cable (2) three-phase short circuit fault and generator outgoing cable (2) two-phase short circuit fault;
the electric faults of the high-speed permanent magnet generator (1) and the generator outgoing cable (2) in the protection range of the generator neutral point zero sequence current transformer (5) are one or more combinations of two-phase short circuit ground faults of the high-speed permanent magnet generator (1), single-phase ground faults of the high-speed permanent magnet generator (1), two-phase short circuit ground faults of the generator outgoing cable (2) and single-phase ground faults of the generator outgoing cable (2);
the switching value acquired by the differential protection and zero sequence grounding protection device (8) comprises a zero position signal of a variable pitch device and a converter operation signal;
the analog quantity parameters collected by the differential protection and zero sequence grounding protection device (8) comprise generator neutral point side phase current, converter side phase current, generator neutral point zero sequence current, generator terminal voltage and generator frequency;
the tripping outlet of the differential protection and zero sequence earth protection device (8) comprises an outlet to a safety chain device, an outlet to a converter grid side circuit breaker (9) and an outlet to a converter.
2. A method for protecting a high-speed permanent magnet wind power generator and an outgoing cable by electric quantity, which is characterized in that the system for protecting the high-speed permanent magnet wind power generator and the outgoing cable by the electric quantity according to claim 1 comprises the following steps:
during the operation period of the high-speed permanent magnet generator (1), the differential protection and zero sequence grounding protection device (8) judges whether two-phase short circuit grounding faults of the high-speed permanent magnet generator (1), single-phase grounding faults of the high-speed permanent magnet generator (1), two-phase short circuit grounding faults of a generator outgoing cable (2), single-phase grounding faults of a generator outgoing cable (2), three-phase short circuit faults of the high-speed permanent magnet generator (1), two-phase short circuit faults of the generator outgoing cable (2) and two-phase short circuit faults of the generator outgoing cable (2) occur or not according to a zero position signal of a variable pitch device, a converter operation signal, side phase current of a generator neutral point, side phase current of the generator neutral point, terminal voltage of the generator and generator frequency, when two-phase short-circuit ground faults of the high-speed permanent magnet generator (1), single-phase ground faults of the high-speed permanent magnet generator (1), two-phase short-circuit ground faults of a generator outgoing cable (2), single-phase ground faults of the generator outgoing cable (2), three-phase short-circuit faults of the high-speed permanent magnet generator (1), two-phase short-circuit faults of the high-speed permanent magnet generator (1), three-phase short-circuit faults of the generator outgoing cable (2) or two-phase short-circuit faults of the generator outgoing cable (2) occur, a tripping outlet is started, a safety chain is triggered, and a converter network side circuit breaker (9) is tripped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110853093.2A CN113488964B (en) | 2021-07-27 | 2021-07-27 | System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity |
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| CN202110853093.2A CN113488964B (en) | 2021-07-27 | 2021-07-27 | System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity |
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| CN113488964B true CN113488964B (en) | 2023-02-21 |
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| CN103701106A (en) * | 2013-12-11 | 2014-04-02 | 清华大学 | Relay protection method applied to micro-grid |
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| WO2005078886A1 (en) * | 2004-02-13 | 2005-08-25 | Zhejiang University | A zero-sequence current braking method for power transformer differential protection |
| CN106786419B (en) * | 2016-12-21 | 2018-11-27 | 华北电力大学 | Wind power plant based on station domain protection philosophy collects system relay protection method |
| CN106786424B (en) * | 2017-01-10 | 2018-11-27 | 华北电力大学 | Send out method for pilot protection of circuit in new energy station based on current waveform similarity |
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2021
- 2021-07-27 CN CN202110853093.2A patent/CN113488964B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701106A (en) * | 2013-12-11 | 2014-04-02 | 清华大学 | Relay protection method applied to micro-grid |
| CN207947605U (en) * | 2017-12-20 | 2018-10-09 | 北京金风科创风电设备有限公司 | Short-circuit protection and wind power plant |
| CN112653106A (en) * | 2020-12-10 | 2021-04-13 | 中水东北勘测设计研究有限责任公司 | Method for starting failure loop of intelligent hydropower station circuit breaker failure protection device |
| CN112670965A (en) * | 2020-12-31 | 2021-04-16 | 龙源（北京）风电工程技术有限公司 | Land double-fed wind turbine generator and box-type transformer combined electrical system |
| CN112701666A (en) * | 2020-12-31 | 2021-04-23 | 龙源（北京）风电工程技术有限公司 | Electrical protection device and method for offshore double-fed wind turbine generator and matched booster equipment |
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| CN113488964A (en) | 2021-10-08 |
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