CN112865178B - Doubly-fed wind power generation system, doubly-fed converter and machine side shutdown control method of doubly-fed converter - Google Patents
Doubly-fed wind power generation system, doubly-fed converter and machine side shutdown control method of doubly-fed converter Download PDFInfo
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Abstract
The invention provides a doubly-fed wind power generation system, a doubly-fed current transformer and a machine side shutdown control method thereof, wherein after a shutdown instruction is received under a normal grid-connected operation state of the doubly-fed current transformer, the power instruction is controlled to be zero, and then whether the stator current is smaller than or equal to a preset safe current is judged; if the stator current is less than or equal to the preset safety current, the stator contactor is controlled to be opened; and after the stator contactor is successfully disconnected, the machine side converter is controlled to shut down after wave sealing. Therefore, even if the control of the machine side converter is abnormal, the stator is not forcedly disconnected with the stator contactor in the state even though the power instruction is given to be 0 and the stator possibly has large current, the stator current is judged first, and the stator contactor of the double-fed converter is controlled to be disconnected only when the stator current is smaller than or equal to the preset safety current, so that arc-striking adhesion of the stator contactor caused by unsafe disconnection of the large current can be avoided.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a doubly-fed wind power generation system, a doubly-fed converter and a machine side shutdown control method thereof.
Background
Wind power generation is widely paid attention to in various fields as clean, rich and renewable energy sources, and particularly in recent years, the doubly-fed wind power generation system is widely applied to large-scale wind farms by virtue of the cost advantages of converters, motors and the like, so that the doubly-fed wind power generation technology is one of the most widely applied wind power generation technologies.
With the technical progress, the capacity of the whole machine set is continuously improved, and the current protection value of the related double-fed current transformer is also continuously increased; therefore, if the unit continues to rely on overvoltage and overcurrent protection under serious faults, delay can exist, and the protection function of key devices cannot be achieved. Furthermore, during the design phase of the doubly-fed converter, in particular during the design phase of its machine side shutdown logic, serious faults, which may be caused by some possible abnormal conditions, should be avoided so as to ensure a safe and reliable machine side shutdown. In the machine side shutdown logic of the current doubly-fed converter, the situation that the stator contactor is not safely opened under high current is easy to occur, and the problem is still to be solved.
Disclosure of Invention
In view of the above, the present 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 the stator contactor is not safely opened in the machine side shutdown logic.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
An embodiment of the present invention provides a machine side shutdown control method of a doubly-fed converter, including:
Receiving a shutdown instruction when the doubly-fed converter is in a normal grid-connected operation state, and controlling the power instruction of the doubly-fed converter to be zero;
judging whether the stator current of the doubly-fed current transformer is smaller than or equal to a preset safety current or not;
if the stator current is smaller than or equal to the preset safety current, controlling a stator contactor of the doubly-fed current transformer to open;
and after the stator contactor is successfully disconnected, controlling the machine side converter of the doubly-fed converter to shut down after wave sealing.
Preferably, the preset safety current is: the stator contactor can realize the maximum current of safe opening.
Preferably, after determining whether the stator current of the doubly-fed current transformer is less than or equal to a preset safety current, the method further includes:
And if the stator current is larger than the preset safety current, controlling the machine side converter to be sealed, and then controlling the stator contactor to be opened.
Preferably, after the stator contactor is successfully opened, the method further comprises:
judging whether the machine side converter is in a wave-generating 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 duration, and establishing stator terminal voltage; thereafter, a step of controlling the machine side converter Feng Bo of the doubly fed converter to stop is performed.
Preferably, the preset duration is 100ms.
Preferably, the controlling the power command of the doubly-fed converter to be zero includes:
controlling an active power instruction and a reactive power instruction of the doubly-fed converter to gradually reduce to zero respectively;
judging whether the active power instruction and the reactive power instruction are both reduced to zero or not;
and if the active power instruction and the reactive power instruction are both reduced to zero, executing the step of judging whether the stator current of the doubly-fed converter is smaller than or equal to a preset safety current.
Preferably, after controlling the stator contactor to open, the method further comprises:
judging whether the stator contactor is successfully disconnected;
If the stator contactor is not successfully opened, a corresponding fault signal is generated, and the frame breaker of the doubly-fed current transformer is controlled to be disconnected and the doubly-fed current transformer is controlled to shut down in a wave sealing mode.
The second aspect of the present invention also provides a double-fed current transformer, comprising: the device 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 net-side contact contactor are respectively connected with the input end of the frame breaker;
the output end of the frame 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 according to any one of the above.
Preferably, the main circuit includes: 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 the 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 network side converter is used as the network side of the main circuit and is connected with the network side contactor.
The third embodiment of the present invention also provides a doubly-fed wind power generation system including: a fan main controller, a wind generating set and a double-fed converter as described in the second aspect;
the wind generating set is connected with a power grid and/or a load through the doubly-fed converter;
the fan main controller is used for controlling the operation of the wind generating set.
Preferably, the doubly-fed converter and the power grid and/or the load are further provided with corresponding transformers.
According to the machine side shutdown control method of the doubly-fed converter, after a shutdown instruction is received under the normal grid-connected operation state of the doubly-fed converter, the power instruction of the doubly-fed converter is controlled to be zero, and then whether the stator current of the doubly-fed converter is smaller than or equal to a preset safe current is judged; if the stator current is smaller than or equal to the preset safety current, the stator contactor of the doubly-fed current transformer is controlled to be disconnected; and after the stator contactor is successfully disconnected, the machine side converter of the doubly-fed converter is controlled to shut down after the wave-sealing. Therefore, even if the control of the machine side converter is abnormal, the stator is not forcedly disconnected with the stator contactor in the state even though the power instruction is given to be 0 and the stator possibly has large current, the stator current is judged first, and the stator contactor of the double-fed converter is controlled to be disconnected only when the stator current is smaller than or equal to the preset safety current, so that arc-striking adhesion of the stator contactor caused by unsafe disconnection 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 that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic 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 of a doubly-fed converter according to an embodiment of the present invention;
fig. 3 is another flowchart of a machine side shutdown control method of a doubly-fed converter according to an embodiment of the present invention;
fig. 4 is another flowchart of a machine side shutdown control method of a doubly-fed converter according to an embodiment of the present invention;
fig. 5 is a partial flow chart of a machine side shutdown control method of a double-fed converter according to another embodiment of the present invention;
fig. 6 is another flowchart of a machine side shutdown control method of a doubly-fed converter according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present disclosure, 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 one … …" does not exclude the presence of other like 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 doubly-fed converter, which is used for avoiding the situation that a stator contactor is not safely opened in machine side shutdown logic.
The structure diagram of the doubly-fed current transformer is shown in fig. 1, and specifically includes: the machine side converter, the grid side converter, the direct current circuit, the stator contactor K1, the grid side contactor K2 and the frame circuit 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 network side contact converter K2 through a direct current circuit and the network 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 contact contactor K2 are respectively connected with the input end of the frame breaker Q1; the output of the frame circuit breaker Q1 is used to connect to the power grid and/or the power grid.
The machine side shutdown control method of the doubly-fed converter, as shown in fig. 2, specifically comprises the following steps:
S101, receiving a shutdown instruction when the doubly-fed converter is in a normal grid-connected operation state, and controlling the power instruction of the doubly-fed converter to be zero.
After the power instruction of the doubly-fed current transformer is zero, the power of the doubly-fed current transformer is changed to zero; under normal conditions, the stator current of the stator should be gradually reduced, but if the control of the machine side converter is abnormal, even if the target value of the power command is set to be zero, a large current may exist on the stator contactor, namely the stator current may be large, and if the maximum current for realizing safe opening of the stator contactor is exceeded, forced breaking of the stator contactor in the state may cause arc-striking 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 safety current.
The preset safe current specifically means: the stator contactor can realize the maximum current of safe brake separation. When the stator current, namely the current flowing on the stator contactor, is smaller than or equal to the preset safety current, the current flowing on the stator contactor is not too large even if the machine side converter is abnormally controlled, and the breaking of the brake can be safely realized without arc-pulling adhesion.
Therefore, if the stator current is less than or equal to the preset safe current, step S103 is performed.
S103, controlling the stator contactor of the doubly-fed converter to be opened.
The process of controlling the stator contactor to open is the same as the prior art, and is not repeated here, and only needs to refer to the prior art.
After the stator contactor is controlled to be opened, whether the opening action is reliably realized should also be detected, and the detection mode is the same as that of the prior art and is not repeated. After detecting that the opening action is reliably realized, the stator contactor is successfully opened.
And S104, after the stator contactor is successfully disconnected, controlling the machine side converter of the doubly-fed converter to shut down after the wave-sealing of the machine side converter.
After the stator contactor is determined to be successfully disconnected, the machine side converter Feng Bo can be controlled to stop, and the machine side stopping process of the doubly-fed converter is completed.
According to the machine side shutdown control method of the doubly-fed converter, even if the machine side converter is controlled abnormally, the situation that the power instruction is given to be 0, but the stator possibly has large current is avoided, the stator contactor is not forcedly disconnected in the state, the stator current is judged first, the stator contactor of the doubly-fed converter is controlled to be disconnected only when the stator current is smaller than or equal to the preset safety current, and further arc-pulling adhesion of the stator contactor caused by unsafe disconnection of the large current can be avoided.
On the basis of the above embodiment, as shown in fig. 3, after step S102, it further includes:
if the stator current is greater than the preset safe current, step S201 is performed.
S201, after the controller side converter is sealed, the stator contactor is controlled to be opened.
If the stator current is greater than the preset safety current, the current flowing on the stator contactor exceeds the maximum current for realizing the safety brake opening of the stator contactor; if the stator is broken forcefully at this time, arc-striking adhesion of the stator contactor may be caused. Therefore, step S201 is needed to be executed, i.e. the machine side converter Feng Bo is controlled first to reduce the stator current, so that the current flowing on the stator contactor is below the maximum current for realizing safe opening, and then the stator contactor is controlled to open, so that the problem that the large current is unsafe to open and the stator contactor is further caused to arc and adhere is avoided.
That is, in the machine side shutdown control method of the doubly-fed converter provided by the embodiment, during the machine side shutdown process, the stator current is monitored in real time, the magnitude of the stator current is judged before the stator contactor is disconnected, the stator contactor is ensured to send out the disconnection instruction of the stator contactor when the stator contactor can be disconnected safely under the current, and otherwise, the machine side wave is sealed and then the disconnection instruction of the stator contactor is sent out; further, the further expansion of the failure in the abnormal state of the machine side control can be effectively avoided.
It is worth to say that, the abnormal reclosing phenomenon of part of the stator contactors, namely the shaking phenomenon of reclosing after the opening is completed, is caused, because in the shutdown logic in the prior art, the rotor is immediately closed after the opening of the stator contactors, if abnormal reclosing occurs to the stator contactors at this time, the stator and the rotor of the doubly-fed motor can generate large impact current, and under serious conditions, hardware damage such as machine side module failure, grid-connected contactor adhesion, converter fuse failure and the like can be caused.
Therefore, the machine side shutdown control method of the doubly-fed converter according to another embodiment of the present invention, based on the above embodiment, further preferably includes, after the stator contactor is successfully opened in step S104, as shown in fig. 4 (which is shown by way of example on the basis of fig. 3):
And S301, if the machine side converter is in a wave-generating running state, the machine side converter is controlled to continuously supply exciting current to the motor rotor within a preset time period, and stator terminal voltage is established.
And then, executing the step of controlling the machine side converter Feng Bo of the doubly-fed converter to stop in the step S104, so as to prevent the large impact current of the converter caused by reclosing due to the problem of the body of the stator contactor after detecting that the stator contactor is disconnected and immediately sealed.
In practical applications, the preset duration may be any value, for example, may be 100ms, but is not limited thereto, and may be within the scope of the present application depending on the application environment.
In order to avoid the problems of stator-rotor overcurrent impact, serious overcurrent of a unit and even module failure caused by the problem of reclosing and shaking of a stator contactor in the shutdown process, after the breaking of the stator contactor is detected, the machine side current transformer continuously delays the wave generation to supply exciting current, for example, the exciting current is continuously supplied for 100ms, during which even if the stator contactor is reclosed, the unit can not generate impact heavy current due to the fact that the exciting current supports the voltage of a stator end, and no damage is brought to the current transformer and the whole machine.
According to the machine side shutdown control method of the doubly-fed current transformer, after the breaking of the stator contactor is detected under normal shutdown, the machine side current transformer continuously supplies exciting current for the motor rotor for 100ms, reclosing faults caused by the problem of the contactor body can be avoided, further hardware damage such as machine side module failure, grid-connected contactor adhesion, converter fuse failure and the like which are possibly further caused can be avoided, and dependence on reliability of the grid-connected contactor is reduced.
On the basis of the above embodiment, as shown in fig. 5, the machine side shutdown control method of the doubly-fed converter, in step S101, controls the power command of the doubly-fed converter to be zero, specifically includes:
s401, controlling an active power instruction and a reactive power instruction of the doubly-fed converter to gradually reduce to zero respectively.
In practical application, after a shutdown instruction is received in a normal grid-connected operation state of the doubly-fed converter, respectively setting target values of an active power instruction and a reactive power instruction of the doubly-fed converter to be zero, and performing instruction buffering, and then executing step S402.
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 may be determined that the step of controlling the power command of the doubly-fed converter to zero has been achieved, and step S102 of determining whether the stator current of the doubly-fed converter is less than or equal to the preset safety current may be performed.
If the active power command or the reactive power command has not been reduced to zero, the process returns to step S401 until both the active power command and the reactive power command are reduced to zero, and then step S102 is executed.
In addition, in practical applications, on the basis of the above, as shown in fig. 6 (for example, on the basis of fig. 4), after step S103, the stator contactor is controlled to be opened, the method further includes:
s501, judging whether the stator contactor is successfully opened.
If the stator contactor is not successfully opened, step S502 is performed.
S502, generating a corresponding fault signal, and controlling a frame breaker of the doubly-fed current transformer to break and the doubly-fed current transformer to shut down in a wave-sealing mode.
The fault signal can be a fault word representing the disconnection failure of the grid-connected contactor, but is not limited to the fault word, and any signal capable of representing the unsuccessful disconnection of the stator contactor is within the protection scope of the application and depends on the specific application environment.
Under the condition that the stator contactor is not successfully disconnected, the frame breaker is controlled to be disconnected, so that the connection between the network side of the doubly-fed current transformer and the externally-connected power grid and the load is disconnected; and then, the doubly-fed converter Feng Bo can be controlled to stop, so that complete stop logic is completed.
Other details of the shutdown logic may be found in the prior art, and are not described in detail herein, and are within the scope of the present application.
Another embodiment of the present invention further provides a doubly-fed converter, including: the main circuit, the stator contactor K1, the net side contactor K2, the frame breaker Q1 and the central control unit.
As shown in fig. 1, the machine side of the main circuit is connected with the rotor winding of the wind generating set; the network side of the main circuit is connected with one end of a network side contact device 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 net-side contact contactor K2 are respectively connected with the input end of the frame circuit breaker Q1; the output of the frame circuit breaker Q1 is used to connect the grid and/or the load. In practical application, a corresponding transformer can be further arranged between the double-fed current transformer and the power grid, and a corresponding transformer can also be arranged between the double-fed current transformer and the load.
As shown in fig. 1, the main circuit of the doubly-fed converter includes: a machine side converter, a network side converter and a direct current circuit; wherein:
the ac side of the machine side converter, which is the machine side of the main circuit, is connected to the rotor windings of the wind power plant.
The direct current side of the machine side converter is connected with the direct current side of the network 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 adapted to perform the machine side shutdown control method of the doubly fed converter as described in any of the embodiments above.
The specific process of the machine side shutdown control method may be referred to the above embodiment, and will not be described herein. Before a stator contactor breaking instruction is issued, the stator current is judged, and the problem that the stator contactor is broken safely due to high current caused by abnormal control can be avoided through the scheme. And under normal shutdown, after detecting that the stator contactor is disconnected, the machine side converter continuously supplies exciting current for 100ms 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 also provides a doubly-fed wind power generation system including: a fan main controller, a wind generating set and a double-fed converter as in the previous 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 doubly fed converter is shown as an example of connecting a power grid through a corresponding transformer and connecting a load through another transformer; in practical application, the double-fed transformer can be only connected with any one of a load and a power grid, and the double-fed transformer is required to be connected according to the specific application environment.
The wind turbine generator system includes: a generator and corresponding blades, etc. (not shown), the stator winding and rotor winding of which are connected to the stator contactor and the machine side of the converter, respectively.
The fan main controller is used for controlling the operation of the wind generating set.
When the wind turbine is in practical application, the main fan controller is arranged in the wind generating set, so that the wind turbine is convenient to control the wind generating set.
The doubly-fed current transformer can convert electric energy generated by the wind generating set into proper electric parameters and then carry out grid connection or drive a load to operate.
The specific structure and principle of the doubly-fed current transformer can be seen from the above embodiments and the prior art, and will not be described in detail. As long as the central control unit inside thereof can perform the machine side shutdown control method described in the above embodiment, all are within the scope of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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.
The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description of the disclosed embodiments 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 (9)
1. A machine side shutdown control method of a double-fed converter, comprising:
Receiving a shutdown instruction when the doubly-fed converter is in a normal grid-connected operation state, and controlling the power instruction of the doubly-fed converter to be zero;
judging whether the stator current of the doubly-fed current transformer is smaller than or equal to a preset safety current or not;
if the stator current is smaller than or equal to the preset safety current, controlling a stator contactor of the doubly-fed current transformer to open;
if the stator current is larger than the preset safety current, controlling the side converter to close and then controlling the stator contactor to open;
after the stator contactor is successfully disconnected, controlling a machine side converter Feng Bo of the doubly-fed converter to stop;
after the stator contactor is successfully disconnected, the method further comprises the following steps:
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 duration, and establishing stator terminal voltage; thereafter, a step of controlling the machine side converter Feng Bo of the doubly fed converter to stop is performed.
2. The machine side shutdown control method of a double-fed current transformer according to claim 1, wherein the preset safety current is: the stator contactor can realize the maximum current of safe opening.
3. The machine side shutdown control method of a double-fed current transformer according to claim 1, wherein the preset time period is 100ms.
4. A machine side shutdown control method of a doubly fed converter according to any one of claims 1-3, characterized in that controlling the power command of the doubly fed converter to zero comprises:
controlling an active power instruction and a reactive power instruction of the doubly-fed converter to gradually reduce to zero respectively;
judging whether the active power instruction and the reactive power instruction are both reduced to zero or not;
and if the active power instruction and the reactive power instruction are both reduced to zero, executing the step of judging whether the stator current of the doubly-fed converter is smaller than or equal to a preset safety current.
5. A machine side shutdown control method of a doubly fed converter according to any one of claims 1-3, further comprising, after controlling the stator contactor to open:
judging whether the stator contactor is successfully disconnected;
If the stator contactor is not successfully opened, a corresponding fault signal is generated, and the frame breaker of the doubly-fed current transformer is controlled to be disconnected and the doubly-fed current transformer is controlled to shut down in a wave sealing mode.
6. A doubly-fed current transformer, comprising: the device 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 net-side contact contactor are respectively connected with the input end of the frame breaker;
the output end of the frame 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 switching 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 current transformer according to any one of claims 1 to 5.
7. The doubly-fed current transformer according to claim 6, wherein said main circuit 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 the 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 network side converter is used as the network side of the main circuit and is connected with the network side contactor.
8. A doubly-fed wind power generation system, comprising: fan master controller, wind generating set and double-fed current transformer according to claim 6 or 7;
the wind generating set is connected with a power grid and/or a load through the doubly-fed converter;
the fan main controller is used for controlling the operation of the wind generating set.
9. Doubly-fed wind power system according to claim 8, characterized in that the doubly-fed converter and the grid and/or the load are further provided with corresponding transformers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110096565.4A CN112865178B (en) | 2021-01-25 | Doubly-fed wind power generation system, doubly-fed converter and machine side shutdown control method of doubly-fed converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110096565.4A CN112865178B (en) | 2021-01-25 | Doubly-fed wind power generation system, doubly-fed converter and machine side shutdown control method of doubly-fed converter |
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| CN112865178A CN112865178A (en) | 2021-05-28 |
| CN112865178B true CN112865178B (en) | 2024-06-25 |
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| CN203434639U (en) * | 2013-08-20 | 2014-02-12 | 北京国电思达科技有限公司 | Grid-connected control device of wind turbine generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203434639U (en) * | 2013-08-20 | 2014-02-12 | 北京国电思达科技有限公司 | Grid-connected control device of wind turbine generator |
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| Title |
|---|
| 双馈变流器改进拓扑研究;王则会等;《风能》;第92-94页 * |
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