CN112865178A - Double-fed wind power generation system, double-fed converter and machine side shutdown control method thereof - Google Patents

Double-fed wind power generation system, double-fed converter and machine side shutdown control method thereof Download PDF

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Publication number
CN112865178A
CN112865178A CN202110096565.4A CN202110096565A CN112865178A CN 112865178 A CN112865178 A CN 112865178A CN 202110096565 A CN202110096565 A CN 202110096565A CN 112865178 A CN112865178 A CN 112865178A
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China
Prior art keywords
converter
stator
fed
current
double
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Granted
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CN202110096565.4A
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Chinese (zh)
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CN112865178B (en
Inventor
杨辉
杨春源
孟祥志
汪令祥
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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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
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • 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

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

Abstract

The invention provides a double-fed wind power generation system, a double-fed converter and a machine side shutdown control method thereof, wherein the method comprises the steps of firstly controlling a power instruction of the double-fed converter to be zero after receiving a shutdown instruction in a normal grid-connected operation state, and then judging whether a stator current of the double-fed converter is less than or equal to a preset safe current; if the stator current is less than or equal to the preset safe current, controlling the opening of the stator contactor; and after the opening of the stator contactor is successful, the machine side converter is controlled to shut down by wave sealing. Therefore, even if the situation that the power command is given as 0 and the stator may have a large current due to the control abnormality of the machine side converter is encountered, the stator contactor cannot be forcibly switched off in the state, the stator current is judged first, and the switching-off of the stator contactor of the double-fed converter is controlled only when the stator current is less than or equal to the preset safe current, so that the arc-pulling adhesion of the stator contactor due to the unsafe switching-off of the large current can be avoided.

Description

Double-fed wind power generation system, double-fed converter and machine side shutdown control method thereof
Technical Field
The invention relates to the technical field of wind power generation, in particular to a double-fed wind power generation system, a double-fed converter and a machine side shutdown control method thereof.
Background
Wind power generation is taken as a clean, rich and renewable energy source, is increasingly widely paid attention from various fields, and particularly is rapidly developed in recent years, at present, a double-fed wind power generation system is widely applied to a large wind field due to the advantages of the cost of a converter, a motor and the like, so that the double-fed wind power generation technology becomes one of the most widely applied wind power generation technologies.
Along with the technical progress, the capacity of the whole machine set is continuously improved, and the current protection value of the double-fed converter related to the capacity is also continuously increased; therefore, if the unit continues to rely on overvoltage and overcurrent protection under serious faults, delay may exist and the protection function of key devices cannot be achieved. Furthermore, in the design stage of the doubly-fed converter, especially in the design stage of the machine-side shutdown logic thereof, serious faults caused by some possible abnormal conditions should be avoided so as to ensure that the machine-side of the doubly-fed converter can be safely and reliably shut down. However, in the machine side shutdown logic of the existing double-fed converter, the situation that the stator contactor is unsafe to open under a large current is easy to occur, and the problem is still to be solved.
Disclosure of Invention
In view of this, the invention provides a doubly-fed wind power generation system, a doubly-fed converter and a machine-side shutdown control method thereof, so as to avoid the situation that a stator contactor is unsafe to be opened in a machine-side shutdown logic.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the first aspect of the embodiment of the invention provides a machine side shutdown control method for a double-fed converter, which comprises the following steps:
receiving a shutdown instruction when the double-fed converter is in a normal grid-connected operation state, and controlling a power instruction of the double-fed converter to be zero;
judging whether the stator current of the doubly-fed converter is less than or equal to a preset safe current or not;
if the stator current is less than or equal to the preset safe current, controlling the opening of a stator contactor of the double-fed converter;
and after the stator contactor is successfully opened, controlling the machine side converter of the double-fed converter to shut down in a wave sealing mode.
Preferably, the preset safe current is as follows: the stator contactor can realize the maximum current of safe opening.
Preferably, after determining whether the stator current of the doubly-fed converter is less than or equal to a preset safety current, the method further includes:
and if the stator current is greater than the preset safe current, controlling the machine side converter to be switched off after the machine side converter is sealed.
Preferably, after the opening of the stator contactor is successful, the method further comprises:
judging whether the machine side converter is in a wave-sending running state or not;
if the machine side converter is in a wave-generating running state, controlling the machine side converter to continuously supply exciting current to a motor rotor within a preset time length and establishing a stator end voltage; and then, executing a step of controlling the machine side converter of the double-fed converter to shut down in a wave mode.
Preferably, the preset time period is 100 ms.
Preferably, the controlling the power command of the doubly-fed converter to be zero includes:
controlling the active power instruction and the reactive power instruction of the double-fed converter to gradually reduce to zero respectively;
judging whether the active power instruction and the reactive power instruction are both slowly reduced to zero or not;
and if the active power instruction and the reactive power instruction are both slowly reduced to zero, executing a step of judging whether the stator current of the double-fed converter is less than or equal to a preset safe current.
Preferably, after controlling the opening of the stator contactor, the method further includes:
judging whether the opening of the stator contactor is successful or not;
and if the opening of the stator contactor is unsuccessful, generating a corresponding fault signal, and controlling the frame breaker of the double-fed converter to break and the double-fed converter to shut down in a wave-sealing mode.
The second aspect of the present invention further provides a doubly-fed converter, including: the system comprises a main circuit, a stator contactor, a network side contactor, a frame circuit breaker and a central control unit;
the machine side of the main circuit is connected with a rotor winding of the wind generating set;
the network side of the main circuit is connected with one end of the network side contactor;
one end of the stator contactor is connected with a stator winding of the wind generating set;
the other end of the stator contactor and the other end of the network side contactor are respectively connected with the input end of the frame circuit breaker;
the output end of the frame circuit breaker is used for connecting a power grid and/or a load;
the central control unit controls the operation of the main circuit and the on-off of the stator contactor, the grid-side contactor and the frame circuit breaker, and is used for executing the machine-side shutdown control method of the double-fed converter.
Preferably, the main circuit includes: the system comprises a machine side converter, a network side converter and a direct current circuit;
the alternating current side of the machine side converter is used as the machine side of the main circuit and is connected with a rotor winding of the wind generating set;
the direct current side of the machine side converter is connected with the direct current side of the grid side converter through the direct current circuit;
and the alternating current side of the grid-side converter is used as the grid side of the main circuit and is connected with the grid-side contactor.
The third embodiment of the present invention further provides a doubly-fed wind power generation system, including: the wind power generation system comprises a wind turbine main controller, a wind generating set and the double-fed converter in the second aspect;
the wind generating set is connected with a power grid and/or a load through the double-fed converter;
and the fan main controller is used for controlling the wind generating set to operate.
Preferably, the double-fed converter and the grid and/or the load are provided with corresponding transformers.
The machine side shutdown control method of the double-fed converter provided by the invention comprises the steps of firstly controlling a power instruction of the double-fed converter to be zero after the double-fed converter receives a shutdown instruction in a normal grid-connected operation state, and then judging whether the stator current of the double-fed converter is less than or equal to a preset safe current or not; if the stator current is less than or equal to the preset safe current, controlling the opening of a stator contactor of the double-fed converter; and after the opening of the stator contactor is successful, controlling the machine side converter of the double-fed converter to shut down by wave sealing. Therefore, even if the situation that the power command is given as 0 and the stator may have a large current due to the control abnormality of the machine side converter is encountered, the stator contactor cannot be forcibly switched off in the state, the stator current is judged first, and the switching-off of the stator contactor of the double-fed converter is controlled only when the stator current is less than or equal to the preset safe current, so that the arc-pulling adhesion of the stator contactor due to the unsafe switching-off of the large current is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a doubly-fed wind power generation system according to an embodiment of the present invention;
fig. 2 is a flowchart of a machine-side shutdown control method for a doubly-fed converter according to an embodiment of the present invention;
fig. 3 is another flowchart of a machine-side shutdown control method for a doubly-fed converter according to an embodiment of the present invention;
fig. 4 is another flowchart of a machine-side shutdown control method for a doubly-fed converter according to an embodiment of the present invention;
fig. 5 is a partial flowchart of a machine-side shutdown control method for a doubly-fed converter according to another embodiment of the present invention;
fig. 6 is another flowchart of a machine-side shutdown control method for a doubly-fed converter according to another embodiment of the present invention.
Detailed Description
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, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the invention provides a machine side shutdown control method of a double-fed converter, which is used for avoiding the condition that a stator contactor is unsafe to be opened in machine side shutdown logic.
The structure diagram of the doubly-fed converter is shown in fig. 1, and the structure diagram specifically includes: machine side converter, grid side converter, dc circuit, stator contactor K1, grid side contactor K2 and frame breaker Q1; the alternating current side of the machine side converter is connected with a rotor winding of the wind generating set; the direct current side of the machine side converter is connected with one end of a grid side contactor K2 through a direct current circuit and a grid side converter in sequence; one end of the stator contactor K1 is connected with a stator winding of the wind generating set; the other end of the stator contactor K1 and the other end of the net side contactor K2 are respectively connected with the input end of a frame breaker Q1; the output of the frame breaker Q1 is used to connect to the grid and/or the grid.
The machine-side shutdown control method of the doubly-fed converter, as shown in fig. 2, specifically includes:
s101, receiving a shutdown instruction when the double-fed converter is in a normal grid-connected operation state, and controlling a power instruction of the double-fed converter to be zero.
After the power instruction of the double-fed converter is zero, the power of the double-fed converter is changed into zero; normally, the stator current should be gradually reduced, but if the machine-side converter control is abnormal, even if the target value of the power command is set to zero, a large current may exist on the stator contactor, that is, the stator current may be large, and if the maximum current at which safe opening of the stator contactor can be realized is exceeded, forced opening of the stator contactor in this state may cause arc discharge and adhesion of the stator contactor. Therefore, step S102 should be performed first.
S102, judging whether the stator current of the doubly-fed converter is smaller than or equal to a preset safe current.
The preset safe current specifically means: the stator contactor can realize the maximum current of safe opening. When the stator current, namely the current flowing on the stator contactor, is less than or equal to the preset safety current, the situation that even if the control of the machine side converter is abnormal at the moment is shown, the current flowing on the stator contactor cannot be too large, the safe brake opening can be realized, and the arc discharge adhesion cannot be caused.
Therefore, if the stator current is less than or equal to the preset safe current, step S103 is executed.
S103, controlling the opening of a stator contactor of the doubly-fed converter.
The process of controlling the opening of the stator contactor is the same as the prior art, and the detailed description is omitted here, and the process can be seen in the prior art.
After the opening of the stator contactor is controlled, whether the opening action is reliably realized should be detected, and the detection mode is also the same as the prior art and is not described again. After the switching-off action is detected to be reliably realized, the success of the switching-off of the stator contactor is indicated.
And S104, controlling the machine side converter of the double-fed converter to shut down in a wave-sealing mode after the stator contactor is successfully opened.
And after the stator contactor is determined to be successfully opened, the machine side converter can be controlled to shut down by sealing waves, and the machine side shutdown process of the double-fed converter is completed.
Even if the machine-side converter is abnormally controlled, the stator contactor cannot be forcibly switched off in the state even if the power command is given as 0 and the stator may have a large current due to the abnormal control of the machine-side converter, the stator current is judged first, and the switching-off of the stator contactor of the double-fed converter is controlled only when the stator current is less than or equal to the preset safe current, so that the arc discharge and the adhesion of the stator contactor due to the unsafe switching-off of the large current can be avoided.
On the basis of the above embodiment, it is preferable that, as shown in fig. 3, after step S102, the method further includes:
if the stator current is greater than the preset safe current, step S201 is executed.
S201, controlling the stator contactor to be switched off after the machine side converter is controlled to be switched off.
If the stator current is larger than the preset safe current, the current flowing on the stator contactor at the moment is indicated to exceed the maximum current of the stator contactor capable of realizing safe opening; if the stator contactor is forcibly disconnected at this time, the stator contactor may be stuck due to arc discharge. Therefore, step S201 needs to be executed, that is, the machine-side converter is controlled to seal the wave to reduce the stator current, so that the current flowing through the stator contactor is below the maximum current capable of achieving safe opening, and then the stator contactor is controlled to open the stator, thereby avoiding unsafe opening of large current and further arc discharge and adhesion of the stator contactor caused thereby.
That is, in the machine-side shutdown control method of the doubly-fed converter provided by this embodiment, the stator current is monitored in real time during the machine-side shutdown process, the magnitude of the stator current is determined before the stator contactor is disconnected, so that the disconnection instruction of the stator contactor is issued only when the stator contactor can be safely disconnected under the current, and otherwise, the disconnection instruction of the stator contactor is issued after the machine-side wave sealing is performed; further, it is possible to effectively avoid further expansion of the failure in the abnormal state of the machine side control.
It is worth to be noted that, a reclosing abnormal phenomenon exists in a part of stator contactors, that is, a reclosing jitter phenomenon after the opening is completed, because in a shutdown logic in the prior art, a rotor immediately seals waves after the opening of the stator contactor is completed, if the stator contactor is abnormally reclosed at the moment, a large impact current is generated in the stator and the rotor of the doubly-fed motor, and hardware damage such as machine side module failure, grid-connected contactor adhesion, converter fuse failure and the like may be caused under severe conditions.
Therefore, on the basis of the above embodiment, it is more preferable that, as shown in fig. 4 (which is illustrated on the basis of fig. 3 for example), the method for controlling machine-side shutdown of a doubly-fed converter according to another embodiment of the present invention further includes, after the opening of the stator contactor in step S104 is successful:
s301, if the machine side converter is in a wave-generating running state, controlling the machine side converter to continuously supply exciting current to a motor rotor within a preset time length and establishing a stator end voltage.
And then, the step of controlling the machine-side converter of the doubly-fed converter to shut down in the step S104 is executed, so that the large impact current of the converter caused by reclosing due to the problem of the stator contactor body after the stator contactor is disconnected and immediately closed is prevented.
In practical applications, the preset duration may be any value, for example, 100ms, but is not limited thereto, and may be determined according to the application environment, and all of them are within the protection scope of the present application.
In order to avoid the problems of over-current impact of a stator and a rotor, serious over-current of a unit and even module failure caused by the problem of reclosing jitter of a stator contactor in the shutdown process, after the disconnection of the stator contactor is detected, the machine side converter continuously delays and sends waves to the exciting current, for example, the exciting current is continuously sent to the machine side converter and maintained for 100ms, even if the stator contactor is closed again in the period, the unit cannot generate impact heavy current because the exciting current supports the end voltage of the stator, and no damage can be caused to the converter and the whole machine.
According to the machine side shutdown control method of the double-fed converter, after the disconnection of the stator contactor is detected under normal shutdown, the machine side converter continuously supplies 100ms long-time exciting current to the motor rotor, the reclosing fault caused by the problem of the contactor body can be avoided, further hardware damage such as machine side module failure, grid-connected contactor adhesion and converter fuse failure which are possibly caused is avoided, and the dependence on the reliability of the grid-connected contactor is reduced.
On the basis of the above embodiment, as shown in fig. 5, the method for controlling machine-side shutdown of a doubly-fed converter specifically includes, in step S101, controlling a power command of the doubly-fed converter to be zero:
s401, controlling the active power instruction and the reactive power instruction of the double-fed converter to gradually reduce to zero respectively.
In practical application, after the doubly-fed converter receives a shutdown instruction in a normal grid-connected operation state, target values of an active power instruction and a reactive power instruction of the doubly-fed converter are respectively set to be zero, instruction mitigation is performed, and then step S402 is executed.
S402, judging whether the active power instruction and the reactive power instruction are both reduced to zero.
If the active power command and the reactive power command are both reduced to zero, it can be determined that the step of controlling the power command of the doubly-fed converter to be zero has been achieved, and the step S102 of determining whether the stator current of the doubly-fed converter is less than or equal to the preset safe current can be executed.
If the active power command or the reactive power command is not reduced to zero, the process returns to step S401 until the active power command and the reactive power command are reduced to zero, and step S102 is executed.
In addition to the above, in practical applications, as shown in fig. 6 (taking the example of fig. 4 as an example), after the step S103 of controlling the opening of the stator contactor, the method further includes:
s501, judging whether the opening of the stator contactor is successful.
If the opening of the stator contactor is not successful, step S502 is executed.
And S502, generating a corresponding fault signal, and controlling the frame circuit breaker of the double-fed converter to break and the double-fed converter to shut down in a wave-sealing mode.
The fault signal may specifically be a fault word representing an opening failure of the grid-connected contactor, but is not limited thereto, and any signal that can represent that the opening of the stator contactor is unsuccessful is within the protection scope of the present application, depending on the specific application environment.
Under the condition that the opening of the stator contactor is unsuccessful, the frame circuit breaker is controlled to be disconnected, and the disconnection between the grid side of the double-fed converter and the external connected grid and the load is realized; and then, the double-fed converter can be controlled to shut down in a wave sealing mode, and further complete shutdown logic is completed.
Other details of the shutdown logic can be found in the prior art, and are not described herein again and are within the scope of the present application.
Another embodiment of the present invention further provides a doubly-fed converter, including: main circuit, stator contactor K1, net side contactor K2, frame circuit breaker Q1 and central control unit.
As shown in fig. 1, the machine side of the main circuit is connected with a rotor winding of a wind generating set; the network side of the main circuit is connected with one end of a network side contactor K2; one end of the stator contactor K1 is connected with a stator winding of the wind generating set; the other end of the stator contactor K1 and the other end of the network side contactor K2 are respectively connected with the input end of a frame breaker Q1; the output of the frame breaker Q1 is used to connect to a grid and/or load. In practical application, a corresponding transformer can be arranged between the double-fed converter and a power grid, and a corresponding transformer can be arranged between the double-fed converter and a load.
As shown in fig. 1, the main circuit of the doubly-fed converter comprises: the system comprises a machine side converter, a network side converter and a direct current circuit; wherein:
and the alternating current side of the machine side converter is used as the machine side of the main circuit and is connected with a rotor winding of the wind generating set.
The direct current side of the machine side converter is connected with the direct current side of the grid side converter through a direct current circuit.
The ac side of the grid-side converter is connected to one end of the grid-side contactor K2 as the grid side of the main circuit.
The central control unit controls the operation of the main circuit and is used for executing the machine-side shutdown control method of the doubly-fed converter according to any of the embodiments.
For specific processes of the machine-side shutdown control method, reference may be made to the above embodiments, which are not described herein again. The method and the device can judge the stator current before the breaking instruction of the stator contactor is issued, and can avoid the large-current unsafe breaking of the stator contactor caused by abnormal control. And under normal shutdown, after detecting that the stator contactor is disconnected, the machine-side converter continuously supplies 100ms long-time exciting current to the motor rotor, so that reclosing faults caused by the problem of the contactor body can be avoided, and the dependence on the reliability of the grid-connected contactor is reduced.
Another embodiment of the present invention further provides a doubly-fed wind power generation system, including: the wind power generation system comprises a wind turbine main controller, a wind generating set and the double-fed converter in the embodiment; wherein:
the wind generating set is connected with a power grid and/or a load through a double-fed converter; in fig. 1, a double-fed converter is shown as an example, which is connected to a power grid through a corresponding transformer, and is connected to a load through another transformer; in practical applications, the double-fed transformer may be connected to only one of the load and the grid, depending on the specific application environment.
The wind generating set includes: a generator, and corresponding blades, etc. (not shown), the stator winding and rotor winding of which are connected to the stator contactor and machine side of the converter, respectively.
The fan main controller is used for controlling the wind generating set to operate.
During practical application, the fan main controller is arranged in the wind generating set, and the wind generating set is conveniently controlled by the fan main controller.
The double-fed converter can convert electric energy generated by the wind generating set into appropriate electric parameters and then carry out grid connection or drive a load to operate.
The specific structure and principle of the doubly-fed converter can be referred to the above embodiments and the prior art, and are not described in detail. It is within the scope of the present application as long as its internal central control unit is capable of executing the machine-side shutdown control method described in the above embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A machine-side shutdown control method of a doubly-fed converter is characterized by comprising the following steps:
receiving a shutdown instruction when the double-fed converter is in a normal grid-connected operation state, and controlling a power instruction of the double-fed converter to be zero;
judging whether the stator current of the doubly-fed converter is less than or equal to a preset safe current or not;
if the stator current is less than or equal to the preset safe current, controlling the opening of a stator contactor of the double-fed converter;
and after the stator contactor is successfully opened, controlling the machine side converter of the double-fed converter to shut down in a wave sealing mode.
2. The machine-side shutdown control method of the doubly-fed converter according to claim 1, wherein the preset safe current is: the stator contactor can realize the maximum current of safe opening.
3. The machine-side shutdown control method of the doubly-fed converter according to claim 1, after determining whether the stator current of the doubly-fed converter is less than or equal to a preset safety current, further comprising:
and if the stator current is greater than the preset safe current, controlling the machine side converter to be switched off after the machine side converter is sealed.
4. The machine-side shutdown control method of the doubly-fed converter as claimed in any of claims 1 to 3, further comprising, after the stator contactor is successfully opened:
if the machine side converter is in a wave-generating running state, controlling the machine side converter to continuously supply exciting current to a motor rotor within a preset time length and establishing a stator end voltage; and then, executing a step of controlling the machine side converter of the double-fed converter to shut down in a wave mode.
5. The machine-side shutdown control method of the doubly-fed converter as claimed in claim 4, wherein said preset time period is 100 ms.
6. The machine-side shutdown control method of the doubly-fed converter according to any of claims 1 to 3, wherein the controlling of the power command of the doubly-fed converter to zero comprises:
controlling the active power instruction and the reactive power instruction of the double-fed converter to gradually reduce to zero respectively;
judging whether the active power instruction and the reactive power instruction are both slowly reduced to zero or not;
and if the active power instruction and the reactive power instruction are both slowly reduced to zero, executing a step of judging whether the stator current of the double-fed converter is less than or equal to a preset safe current.
7. The machine-side shutdown control method of the doubly-fed converter as claimed in any of claims 1 to 3, further comprising, after controlling the opening of the stator contactor:
judging whether the opening of the stator contactor is successful or not;
and if the opening of the stator contactor is unsuccessful, generating a corresponding fault signal, and controlling the frame breaker of the double-fed converter to break and the double-fed converter to shut down in a wave-sealing mode.
8. A doubly-fed converter, comprising: the system comprises a main circuit, a stator contactor, a network side contactor, a frame circuit breaker and a central control unit;
the machine side of the main circuit is connected with a rotor winding of the wind generating set;
the network side of the main circuit is connected with one end of the network side contactor;
one end of the stator contactor is connected with a stator winding of the wind generating set;
the other end of the stator contactor and the other end of the network side contactor are respectively connected with the input end of the frame circuit breaker;
the output end of the frame circuit breaker is used for connecting a power grid and/or a load;
the central control unit controls the main circuit operation and the switching of the stator contactors, the grid side contactors and the frame circuit breakers and is adapted to perform a machine side shutdown control method of the doubly fed converter as claimed in any of claims 1-7.
9. The doubly-fed converter according to claim 8, wherein said main circuit comprises: the system comprises a machine side converter, a network side converter and a direct current circuit;
the alternating current side of the machine side converter is used as the machine side of the main circuit and is connected with a rotor winding of the wind generating set;
the direct current side of the machine side converter is connected with the direct current side of the grid side converter through the direct current circuit;
and the alternating current side of the grid-side converter is used as the grid side of the main circuit and is connected with the grid-side contactor.
10. A doubly-fed wind power generation system, comprising: a wind turbine main controller, a wind generating set and a doubly-fed converter according to claim 8 or 9;
the wind generating set is connected with a power grid and/or a load through the double-fed converter;
and the fan main controller is used for controlling the wind generating set to operate.
11. A doubly-fed wind power generation system according to claim 10, wherein said doubly-fed converter is further provided with a corresponding transformer with the grid and/or the load.
CN202110096565.4A 2021-01-25 Doubly-fed wind power generation system, doubly-fed converter and machine side shutdown control method of doubly-fed converter Active CN112865178B (en)

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