CN112152254A - Control method and control system of double-winding converter - Google Patents
Control method and control system of double-winding converter Download PDFInfo
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- CN112152254A CN112152254A CN201910560415.7A CN201910560415A CN112152254A CN 112152254 A CN112152254 A CN 112152254A CN 201910560415 A CN201910560415 A CN 201910560415A CN 112152254 A CN112152254 A CN 112152254A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention provides a control method and a control system of a double-winding converter. The double-winding converter comprises a first converting winding, a second converting winding, a first controller, a second controller and a central controller, wherein the first converting winding and the second converting winding are connected in parallel, the first controller is used for controlling the first converting winding, the second controller is used for controlling the second converting winding, and the central controller is used for controlling the second converting winding. The first variable current winding is connected to a first stator winding of the double-winding generator, and the second variable current winding is connected to a second stator winding of the double-winding generator. The method comprises the following steps: the central controller predicts whether the grid side power of the double-winding converter is smaller than a first threshold value; if the power of the grid side is smaller than a first threshold value, the first variable current winding is enabled to operate only through the first controller, and a single operation mode is entered; and if the net side power is larger than a first threshold value, operating the first variable current winding through the first controller and operating the second variable current winding through the second controller, and entering a double operation mode. The method is beneficial to improving the operation efficiency.
Description
Technical Field
The present disclosure relates to the field of dual winding converter control technologies, and in particular, to a control method and a control system for a dual winding converter.
Background
Wind power installations are usually connected with a plurality of variable-current windings for converting alternating current to direct current. In the process of wind power generation, the generated power of the wind generating set greatly fluctuates due to the randomness and the fluctuation characteristic of wind energy. No matter how large the generated power, a plurality of variable current windings are required to operate simultaneously. However, this tends to cause the entire wind power generation system to operate inefficiently.
Disclosure of Invention
The invention provides a control method and a control system of a double-winding converter at least for improving the operation efficiency of a wind power generation system.
One aspect of the present invention provides a control method for a dual-winding converter, where the dual-winding converter includes a first variable current winding and a second variable current winding connected in parallel, a first controller for controlling the first variable current winding, a second controller for controlling the second variable current winding, and a central controller, the first variable current winding is connected to a first stator winding of a dual-winding generator, and the second variable current winding is connected to a second stator winding of the dual-winding generator. The control method comprises the following steps: the central controller predicts whether the grid side power of the double-winding converter is smaller than a first threshold value; if the power of the grid side is predicted to be smaller than a first threshold value, the first variable current winding is enabled to operate only through the first controller, and a single operation mode is entered; and if the net side power is predicted to be larger than a first threshold value, operating the first variable current winding through the first controller and operating the second variable current winding through the second controller, and entering a double operation mode.
The control method further comprises the following steps: during the single operation mode, if the central controller monitors that the power of the grid side is greater than a first threshold value and lasts for a specific time period, the first variable current winding is operated through the first controller, the second variable current winding is operated through the second controller, and the dual operation mode is switched to; during the double operation mode, if the central controller monitors that the power of the grid side is smaller than a first threshold value, hysteresis control is carried out on the double-winding converter, and the double-winding converter is switched to the single operation mode.
The central controller is connected to and communicates with a fan main controller, the fan main controller is used for controlling the double-winding generator, and the control method further comprises the following steps: during a single operation mode and/or when the double-winding converter is switched between the single operation mode and the double operation mode, the central controller requests the fan main controller to limit the rotating speed of the double-winding generator; the wind turbine master controller limits a rotational speed of the dual winding generator to less than a predetermined rotational speed in response to the request.
The control method further comprises the following steps: during the single operation mode and/or when the double-winding converter is switched between the single operation mode and the double operation mode, the fan main controller shields an operation state feedback signal corresponding to the second variable current winding, wherein the operation state feedback signal indicates the operation state of the second variable current winding.
The operation state feedback signal includes: the machine side modulation signal, the net side modulation signal of the second variable current winding, and at least one of the rotational speed signal and the torque signal of the second stator winding.
The switching of the hysteresis control of the double-winding converter to the single-operation mode through the central controller comprises the following steps: and if the central controller monitors that the power of the grid side is smaller than a second threshold value, the central controller enables the first variable current winding to operate through the first controller and enables the second variable current winding to stop operating through the second controller, and the central controller enters a single operation mode, wherein the second threshold value is smaller than the first threshold value.
The control method further comprises the following steps: during a single run mode, distributing the demanded torque of the generator entirely to the machine side torque of the first converter winding by the central controller; during a double run mode, equally distributing the demanded torque to the machine side torques of the first and second converter windings by a central controller; during a switch from single mode to dual mode operation, as the central controller drops machine side torque of the first converter winding through the first controller, the central controller raises machine side torque of the second converter winding through the second controller, and the sum of machine side torque of the first converter winding and machine side torque of the second converter winding is equal to the demand torque; during a switch from dual mode to single mode operation, as the central controller increases the machine side torque of the first converter winding via the first controller, the central controller decreases the machine side torque of the second converter winding via the second controller, and the sum of the machine side torque of the first converter winding and the machine side torque of the second converter winding is equal to the requested torque.
The control method further comprises the following steps: during the single operation mode, when high voltage ride through or low voltage ride through occurs on the grid side of the dual-winding converter, the central controller controls the second grid-side inverter in the second converter winding to switch from the standby state to the operation state through the second controller, and controls the second machine-side rectifier in the second converter winding to maintain the standby state through the second controller.
Another aspect of the present invention provides a control system for a dual-winding converter, the dual-winding converter including a first variable current winding and a second variable current winding connected in parallel, the control system comprising: the first controller is used for controlling the first variable current winding, wherein the first variable current winding is connected to a first stator winding of the double-winding generator; the second controller is used for controlling the second variable current winding, wherein the second variable current winding is connected to a second stator winding of the double-winding generator; and a central controller for performing the following operations: predicting whether the grid-side power of the double-winding converter is smaller than a first threshold value; if the power of the grid side is predicted to be smaller than a first threshold value, the first variable current winding is enabled to operate only through the first controller, and a single operation mode is entered; and if the net side power is predicted to be larger than a first threshold value, operating the first variable current winding through the first controller and operating the second variable current winding through the second controller, and entering a double operation mode.
The central controller is further configured to: during the single operation mode, if the power of the grid side is monitored to be larger than a first threshold value and lasts for a specific time period, the first variable current winding is enabled to operate through the first controller, the second variable current winding is enabled to operate through the second controller, and the double operation mode is switched; during the double operation mode, if the network side power is monitored to be smaller than a first threshold value, hysteresis control is carried out on the double-winding converter, and the double-winding converter is switched to a single operation mode.
The central controller is connected to and communicates with the fan main controller, the fan main controller is used for controlling the double-winding generator, and during a single operation mode and/or when the double-winding converter is switched between the single operation mode and the double operation mode, the central controller requests the fan main controller to limit the rotating speed of the double-winding generator; the wind turbine master controller limits a rotational speed of the dual winding generator to less than a predetermined rotational speed in response to the request.
During the single operation mode and/or when the double-winding converter is switched between the single operation mode and the double operation mode, the fan main controller shields an operation state feedback signal corresponding to the second variable current winding, wherein the operation state feedback signal indicates the operation state of the second variable current winding.
And if the central controller monitors that the power of the grid side is smaller than a second threshold value, the central controller enables the first variable current winding to operate through the first controller and enables the second variable current winding to stop operating through the second controller, and the central controller enters a single operation mode, wherein the second threshold value is smaller than the first threshold value.
During a single run mode, distributing the demanded torque of the generator entirely to the machine side torque of the first converter winding by the central controller; during a double run mode, equally distributing the demanded torque to the machine side torques of the first and second converter windings by a central controller; during a switch from single mode to dual mode operation, as the central controller drops machine side torque of the first converter winding through the first controller, the central controller raises machine side torque of the second converter winding through the second controller, and the sum of machine side torque of the first converter winding and machine side torque of the second converter winding is equal to the demand torque; during a switch from dual mode to single mode operation, as the central controller increases the machine side torque of the first converter winding via the first controller, the central controller decreases the machine side torque of the second converter winding via the second controller, and the sum of the machine side torque of the first converter winding and the machine side torque of the second converter winding is equal to the requested torque.
The second converter winding includes a second net-side inverter and a second machine-side rectifier. During the single operation mode, when high voltage ride through or low voltage ride through occurs on the grid side of the double-winding converter, the central controller controls the second grid-side inverter to be switched from a standby state to an operation state through the second controller, and controls the second machine-side rectifier to be kept in the standby state through the second controller.
Another aspect of the present invention is to provide a computing device comprising a processor and a readable storage medium storing a computer program comprising instructions for the processor to perform the steps of the control method of a dual winding converter as described above.
By the control method and the control system of the double-winding converter, at least the following technical effects can be realized: based on the parallel structure of the double-winding converter, the operation mode of the double-winding converter can be adaptively adjusted in real time according to the power of the grid side of the double-winding generator, the electric power is saved, the operation efficiency of the whole wind power generation system is improved, and particularly the power curve of a low-power generation section can be optimized.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 is a block diagram of a wind power generation system according to an exemplary embodiment of the present invention.
FIG. 2 is another block diagram of a wind power generation system according to an exemplary embodiment of the present invention.
Fig. 3 is a flowchart of a control method of a dual winding converter according to an exemplary embodiment of the present invention.
The reference numerals are explained below:
100: a wind power generation system; 1: a generator; 2: a fan main controller;
3: a control system of the double-winding converter; 4: a double winding current transformer; 5: a power grid;
31: a central controller; 32: a first controller; 33: a second controller;
41: a first variable current winding; 42: a second variable current winding;
411: a first machine-side rectifier; 412: a first grid-side inverter;
421: a second machine-side rectifier; 422: a second grid-side inverter.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below with reference to the accompanying drawings. Wherein like reference numerals refer to like parts throughout. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention is not limited thereto. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
FIG. 1 is a block diagram of a wind power generation system 100 according to an exemplary embodiment of the present invention. FIG. 2 is another block diagram of a wind power generation system 100 according to an exemplary embodiment of the present invention.
Referring to fig. 1, a wind power generation system 100 according to an exemplary embodiment of the present invention comprises a double winding generator 1, a wind turbine main controller 2, a control system 3 of a double winding converter, a double winding converter 4 and a grid 5. The two-winding generator 1 is provided in a wind turbine generator set (not shown) of the wind turbine generator system 100, and the wind turbine main controller 2 is used to control the wind turbine generator set. As shown in fig. 1, a wind turbine main controller 2 is connected to a two-winding generator 1 to control the two-winding generator 1. The control system 3 of the double winding converter comprises a central controller 31, a first controller 32 and a second controller 33. The central controller 31 is connected to the fan main controller 2 and communicates with the fan main controller 2. The fan master controller 2 may control the control system 3 of the double winding converter by controlling the central controller 31. The double-winding converter 4 comprises a first converter winding 41 and a second converter winding 42 which are connected in parallel. The first controller 32 is adapted to control the first variable current winding 41 and the second controller 33 is adapted to control the second variable current winding 42.
Referring to fig. 2, the double winding generator 1 includes a first stator winding 11 and a second stator winding 12. The first converter winding 41 comprises a first machine-side rectifier 411 and a first grid-side inverter 412, and the second converter winding 42 comprises a second machine-side rectifier 421 and a second grid-side inverter 422. The first stator winding 11 is connected to a first machine-side rectifier 411 and the second stator winding 12 is connected to a second machine-side rectifier 421. The first grid-side inverter 412 and the second grid-side inverter 422 are connected to the grid 5.
A flow chart of a control method of the control system 3 of the double winding converter is described in detail below with reference to fig. 3.
Fig. 3 is a flowchart of a control method implemented by the control system 3 for controlling the double winding converter 4 according to an exemplary embodiment of the present invention.
As shown in fig. 3, in step S100, the wind turbine master controller 2 sends a converter start command to the central controller 31 to instruct the central controller 31 to start the dual winding converter 4. The central controller 31 causes the first variable current winding 41 and the second variable current winding 42 to perform operations of precharging, closing standby, and the like through the first controller 32 and the second controller 33, respectively.
In step S101, the central controller 31 predicts the grid-side power of the two-winding converter 4. In step S102, the central controller 31 determines whether the predicted grid-side power is less than a first threshold. If the grid-side power is less than the first threshold, the central controller 31 transmits a single operation signal to the main controller 2 of the blower and performs step S103 to perform the single operation mode. Specifically, in step S103, the wind turbine master controller 2 sends a converter grid side modulation command and a converter side modulation command to the central controller 31 in response to the single operation signal; the central controller 31 responds to the converter grid-side modulation command and the converter-side modulation command by operating the first grid-side inverter 412 and the first machine-side rectifier 411 of the first converter winding 41 sequentially only by the first controller 32, entering the single-operation mode. During the single run mode, the wind turbine master controller 2 sends to the central controller 31, in response to the single run signal, a converter side modulation command and the requested torque of the dual winding generator 1 to instruct the central controller 31 to fully distribute the requested torque of said dual winding generator 1 to the side torque of the first converter winding 41.
If the grid-side power is greater than or equal to the first threshold, the central controller 31 transmits a dual operation signal to the main controller 2 of the blower, and performs step S104 to perform the dual operation mode. Specifically, in step S104, the wind turbine master controller 2 sends a converter grid side modulation command and a converter side modulation command to the central controller 31 in response to the double operation signal; the central controller 31 responds to the converter grid side modulation command and the converter side modulation command by operating the first grid side inverter 412 and the first machine side rectifier 411 of the first converter winding 41 in sequence by said first controller 32 and operating the second grid side inverter 422 and the second machine side rectifier 421 of the second converter winding 42 in sequence by said second controller 33, entering a dual operation mode. During the double operation mode, the wind turbine main controller 2 sends a converter-side modulation command and a demanded torque of the double winding generator 1 to the central controller 31 in response to the double operation signal, to instruct the central controller 31 to equally distribute the demanded torque to the machine-side torques of the first and second converter windings 41, 42.
During the single operation mode, the central controller 31 continuously monitors the grid-side power and performs step 105 to determine whether the grid-side power is greater than the first threshold. The first threshold value may be set according to the operating efficiency, energy saving requirements, etc. of the wind power generation system 100. For example, when the rotation speed of the double-winding generator 1 is low and the torque is large, the wind turbine generator system including the double-winding generator 1 is likely to vibrate, which causes adverse effects. The first threshold value can therefore be set according to a specific rotational speed and a specific torque of the two-winding generator in order to avoid switching the operating mode of the two-winding converter 4 in the case of a low rotational speed and a high torque of the two-winding generator 1.
If the network-side power is monitored to be greater than the first threshold, the central controller 31 performs step S107 to further determine whether the network-side power is greater than the first threshold for a certain period of time (e.g., 20 ms, etc.). Otherwise, wind power generation system 100 continues to execute the single mode of operation. If the network-side power is greater than the first threshold for a certain period of time, step S109 is performed.
In step S109, the central controller 31 sends a double operation signal to the main controller 2 of the wind turbine, and the central controller 31 responds to the grid-side modulation command and the converter-side modulation command to sequentially operate the first grid-side inverter 412 and the first machine-side rectifier 411 of the first converter winding 41 through the first controller 32 and sequentially operate the second grid-side inverter 422 and the second machine-side rectifier 421 of the second converter winding 42 through the second controller 33, thereby switching to the double operation mode. During the switch from the single-run mode to the dual-run mode, in response to the converter-side modulation command, as the central controller 31 drops the machine-side torque of the first converter winding 41 via the first controller 32, the central controller 31 raises the machine-side torque of the second converter winding 42 via the second controller 33, and the sum of the machine-side torque of the first converter winding 41 and the machine-side torque of the second converter winding 42 equals the required torque. For example, but not limiting of, the central controller 31 via the first controller 32 causes the machine side torque of the first converter winding 41 to decrease at a first slope, while the central controller 31 via the second controller 33 causes the machine side torque of the second converter winding 42 to increase at a second slope, and the sum of the machine side torque of the first converter winding 41 and the machine side torque of the second converter winding 42 remains equal to the demand torque. The first and second slopes may be set according to a torque variation demand sufficient to avoid vibrations of the wind park, for example, but not limited to, via experimentation or testing.
After switching to the dual operation mode, the execution continues to step S104. During the dual mode of operation, the central controller 31 continuously monitors the grid side power. If the central controller 31 monitors that the grid-side power is smaller than the first threshold, the central controller 31 performs hysteresis control on the dual-winding converter 4. For example, but not limiting of, in step S106, the central controller 31 determines whether the grid-side power is less than a second threshold, and if the grid-side power is less than the second threshold, then step S108 is performed. Wherein the second threshold is less than the first threshold. Therefore, the double-winding converter 4 can be effectively prevented from frequently switching the operation mode.
For example, but not limiting of, the control method may further include: during the dual operation mode, the central controller 31 continuously monitors the real-time network-side power and records the network-side power for a certain period of time, and then performs data processing on the recorded network-side power. And when the real-time network side power is smaller than the second threshold and the network side power after the data processing is smaller than the second threshold, executing step S108.
In step S108, the central controller 31 sends a single-operation signal to the main controller 2 of the wind turbine, and in response to the grid-side modulation command and the converter-side modulation command, the central controller 31 makes the first grid-side inverter 412 and the first machine-side rectifier 411 of the first converter winding 41 keep operating through the first controller 32 and makes the second grid-side inverter 422 and the second machine-side rectifier 421 of the second converter winding 42 stop operating sequentially through the second controller 33 to enter a standby state, so as to switch to a single-operation mode. During the switch from the dual operating mode to the single operating mode, in response to the converter side modulation command, as the central controller 31 raises the machine side torque of the first converter winding 41 via the first controller 32, the central controller 31 lowers the machine side torque of the second converter winding 42 via the second controller 33, and the sum of the machine side torque of the first converter winding 41 and the machine side torque of the second converter winding 42 equals the required torque. For example, but not limiting of, the central controller 31, via the first controller 32, causes the machine side torque of the first converter winding 41 to rise at a third slope, while the central controller 31, via the second controller 33, causes the machine side torque of the second converter winding 42 to fall at a fourth slope, and the sum of the machine side torque of the first converter winding 41 and the machine side torque of the second converter winding 42 remains equal to the torque demand. The third and fourth slopes may be set according to a torque variation demand sufficient to avoid vibrations of the wind park, for example, but not limited to, via experimentation or testing.
For example, but not limiting of, during the single operation mode (step S103) and/or when the double winding converter 4 switches between the single operation mode and the double operation mode (steps S108 and S109), the central controller 31 requests the wind turbine main controller 2 to limit the rotation speed of the double winding generator, and the wind turbine main controller 2 limits the rotation speed of the double winding generator 1 to be less than a predetermined rotation speed in response to the request, so as to avoid the double winding converter 4 from switching operation modes at a high rotation speed of the double winding generator 1, and avoid switching failure and conversion fault.
Further, during the single mode of operation (step S103) and/or when the dual winding converter 4 is switched between the single mode of operation and the dual mode of operation (steps S108 and S109), the wind turbine main controller 2 may mask an operating condition feedback signal corresponding to the second variable current winding 42, the operating condition feedback signal indicating an operating condition of the second variable current winding 42. The operating condition feedback signals include, but are not limited to: the machine side modulation signal, the net side modulation signal of the second variable current winding, and at least one of the rotational speed signal and the torque signal of the second stator winding. By shielding the operating state feedback signal indicative of the operating state of second converter winding 42, it is possible to avoid that an invalid fault feedback adversely affects the operation of wind power generation system 100.
Furthermore, during the single operation mode (step S103), when a high voltage ride-through or a low voltage ride-through occurs on the grid side of the double-winding converter 4, the central controller 31 controls the second grid-side inverter 422 in the second converter winding 42 to switch from the standby state to the operation state through the second controller 33, and controls the second machine-side rectifier 421 in the second converter winding 42 to maintain the standby state through the second controller 33. For example, and without limitation, when a high voltage ride through or a low voltage ride through occurs on the grid side of the two winding converter 4, the fan main controller 2 may selectively mask an operating state feedback signal corresponding to the second converter winding 42, the operating state feedback signal indicating the operating state of the second converter winding 42.
Further, optionally, for the single operation mode, it is not limited to only controlling the first variable current winding 41 by the first controller 32, but may also be implemented only by controlling the first variable current winding 42 by the second controller 33. For example, but not limiting of, component fatigue damage due to uneven load sharing may be prevented by alternating the start and stop of first converter winding 41 controlled by first controller 32 and first converter winding 42 controlled by second controller 33 during the single run mode.
Further, the present invention also provides a computer-readable storage medium storing a computer program, which may include instructions for performing various operations in the control method of the above-described double winding converter. In particular, the computer program may comprise instructions for carrying out the individual steps described with reference to fig. 3.
In addition, the invention also provides a computing device which comprises a processor and a readable storage medium storing a computer program, wherein the computer program comprises instructions for executing various operations in the control method of the double-winding current transformer. In particular, the program may comprise instructions for carrying out the various steps described with reference to fig. 3.
The control method and the control system of the double-winding converter can at least adaptively adjust the operation mode of the double-winding converter in real time according to the power of the grid side of the double-winding generator based on the parallel structure of the double-winding converter, save the electric power, improve the operation efficiency of the whole wind power generation system, and at least optimize the power curve of a low power generation section. In addition, the control method and the control system according to the invention are not limited to be applied to the double-winding converter, and can also be applied to a multi-winding converter comprising two or more converting windings according to actual requirements so as to adaptively adjust the operation mode of the multi-winding converter.
Control logic or functions performed by a controller or program modules or the like may be represented by flow charts or the like in one or more of the figures. These figures provide representative control strategies and/or logic that may be implemented using one or more processing strategies (such as event-driven, interrupt-driven, multi-tasking, multi-threading, and the like). As such, various steps or functions illustrated may be performed in the sequence illustrated, in parallel, or in some cases omitted. Although not always explicitly illustrated, one of ordinary skill in the art will recognize that one or more of the illustrated steps or functions may be repeatedly performed depending on the particular processing strategy being used.
The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only used for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the design idea of the present invention belong to the protection scope of the present invention.
Claims (16)
1. A control method of a double-winding converter is characterized in that the double-winding converter comprises a first converting winding, a second converting winding, a first controller, a second controller and a central controller, wherein the first converting winding and the second converting winding are connected in parallel, the first controller is used for controlling the first converting winding, the second controller is used for controlling the second converting winding, the first converting winding is connected to a first stator winding of a double-winding generator, the second converting winding is connected to a second stator winding of the double-winding generator, and the control method comprises the following steps:
the central controller predicts whether the grid side power of the double-winding converter is smaller than a first threshold value; if the power of the grid side is predicted to be smaller than a first threshold value, the first variable current winding is enabled to operate only through the first controller, and a single operation mode is entered; and if the net side power is predicted to be larger than a first threshold value, operating the first variable current winding through the first controller and operating the second variable current winding through the second controller, and entering a double operation mode.
2. The control method according to claim 1, characterized by further comprising:
during the single operation mode, if the central controller monitors that the power of the grid side is greater than a first threshold value and lasts for a specific time period, the first variable current winding is operated through the first controller, the second variable current winding is operated through the second controller, and the dual operation mode is switched to;
during the double operation mode, if the central controller monitors that the power of the grid side is smaller than a first threshold value, hysteresis control is carried out on the double-winding converter, and the double-winding converter is switched to the single operation mode.
3. The control method of claim 2, wherein the central controller is connected to and in communication with a wind turbine main controller, the wind turbine main controller being configured to control a dual winding generator, the control method further comprising:
during a single operation mode and/or when the double-winding converter is switched between the single operation mode and the double operation mode, the central controller requests the fan main controller to limit the rotating speed of the double-winding generator;
the wind turbine master controller limits a rotational speed of the dual winding generator to less than a predetermined rotational speed in response to the request.
4. The control method according to claim 2, characterized by further comprising:
during the single operation mode and/or when the double-winding converter is switched between the single operation mode and the double operation mode, the fan main controller shields an operation state feedback signal corresponding to the second variable current winding, wherein the operation state feedback signal indicates the operation state of the second variable current winding.
5. The control method of claim 4, wherein the operating state feedback signal comprises: the machine side modulation signal, the net side modulation signal of the second variable current winding, and at least one of the rotational speed signal and the torque signal of the second stator winding.
6. The control method of claim 2, wherein switching hysteresis control of the dual-winding converter to the single-operation mode by the central controller comprises: and if the central controller monitors that the power of the grid side is smaller than a second threshold value, the central controller enables the first variable current winding to operate through the first controller and enables the second variable current winding to stop operating through the second controller, and the central controller enters a single operation mode, wherein the second threshold value is smaller than the first threshold value.
7. The control method according to claim 2, characterized by further comprising:
during a single run mode, distributing the demanded torque of the generator entirely to the machine side torque of the first converter winding by the central controller;
during a double run mode, equally distributing the demanded torque to the machine side torques of the first and second converter windings by a central controller;
during a switch from single mode to dual mode operation, as the central controller drops machine side torque of the first converter winding through the first controller, the central controller raises machine side torque of the second converter winding through the second controller, and the sum of machine side torque of the first converter winding and machine side torque of the second converter winding is equal to the demand torque;
during a switch from dual mode to single mode operation, as the central controller increases the machine side torque of the first converter winding via the first controller, the central controller decreases the machine side torque of the second converter winding via the second controller, and the sum of the machine side torque of the first converter winding and the machine side torque of the second converter winding is equal to the requested torque.
8. The control method according to claim 1, characterized by further comprising: during the single operation mode, when high voltage ride through or low voltage ride through occurs on the grid side of the dual-winding converter, the central controller controls the second grid-side inverter in the second converter winding to switch from the standby state to the operation state through the second controller, and controls the second machine-side rectifier in the second converter winding to maintain the standby state through the second controller.
9. A control system of a double-winding converter, wherein the double-winding converter comprises a first converting winding and a second converting winding which are connected in parallel, and the control system comprises:
the first controller is used for controlling the first variable current winding, wherein the first variable current winding is connected to a first stator winding of the double-winding generator;
the second controller is used for controlling the second variable current winding, wherein the second variable current winding is connected to a second stator winding of the double-winding generator; and
a central controller for performing the following operations: predicting whether the grid-side power of the double-winding converter is smaller than a first threshold value; if the power of the grid side is predicted to be smaller than a first threshold value, the first variable current winding is enabled to operate only through the first controller, and a single operation mode is entered; and if the net side power is predicted to be larger than a first threshold value, operating the first variable current winding through the first controller and operating the second variable current winding through the second controller, and entering a double operation mode.
10. The control system of claim 9, wherein the central controller is further configured to: during the single operation mode, if the power of the grid side is monitored to be larger than a first threshold value and lasts for a specific time period, the first variable current winding is enabled to operate through the first controller, the second variable current winding is enabled to operate through the second controller, and the double operation mode is switched;
during the double operation mode, if the network side power is monitored to be smaller than a first threshold value, hysteresis control is carried out on the double-winding converter, and the double-winding converter is switched to a single operation mode.
11. The control system of claim 10, wherein the central controller is connected to and in communication with a wind turbine main controller for controlling the dual winding generator, the central controller requesting the wind turbine main controller to limit the rotational speed of the dual winding generator during the single mode of operation and/or when the dual winding converter switches between the single mode of operation and the dual mode of operation; the wind turbine master controller limits a rotational speed of the dual winding generator to less than a predetermined rotational speed in response to the request.
12. The control system of claim 10 wherein the wind turbine main controller masks an operating condition feedback signal corresponding to the second variable current winding during the single mode of operation and/or when the dual winding converter switches between the single mode of operation and the dual mode of operation, the operating condition feedback signal indicating an operating condition of the second variable current winding.
13. The control system of claim 10, wherein if the central controller monitors that the grid side power is less than a second threshold, the central controller causes the first variable current winding to operate via the first controller and causes the second variable current winding to stop operating via the second controller, entering a single mode of operation, wherein the second threshold is less than the first threshold.
14. The control system of claim 10, wherein during the single run mode, the requested torque of the generator is fully distributed to the machine side torque of the first converter winding by the central controller;
during a double run mode, equally distributing the demanded torque to the machine side torques of the first and second converter windings by a central controller;
during a switch from single mode to dual mode operation, as the central controller drops machine side torque of the first converter winding through the first controller, the central controller raises machine side torque of the second converter winding through the second controller, and the sum of machine side torque of the first converter winding and machine side torque of the second converter winding is equal to the demand torque;
during a switch from dual mode to single mode operation, as the central controller increases the machine side torque of the first converter winding via the first controller, the central controller decreases the machine side torque of the second converter winding via the second controller, and the sum of the machine side torque of the first converter winding and the machine side torque of the second converter winding is equal to the requested torque.
15. The control system of claim 9, wherein the second conversion winding includes a second grid-side inverter and a second machine-side rectifier,
during the single operation mode, when high voltage ride through or low voltage ride through occurs on the grid side of the double-winding converter, the central controller controls the second grid-side inverter to be switched from a standby state to an operation state through the second controller, and controls the second machine-side rectifier to be kept in the standby state through the second controller.
16. A computing device comprising a processor and a readable medium having stored thereon a computer program, characterized in that the computer program comprises instructions for the processor to carry out the steps of the control method according to any one of claims 1-8.
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