CN116260191B - Grid-connected control method, device, equipment and medium of wind generating set - Google Patents

Grid-connected control method, device, equipment and medium of wind generating set Download PDF

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Publication number
CN116260191B
CN116260191B CN202310546251.9A CN202310546251A CN116260191B CN 116260191 B CN116260191 B CN 116260191B CN 202310546251 A CN202310546251 A CN 202310546251A CN 116260191 B CN116260191 B CN 116260191B
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grid
voltage
value
axis
generating set
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CN116260191A (en
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庞仁杰
艾斯卡尔
武磊
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment 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
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • 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)
  • Wind Motors (AREA)

Abstract

The application discloses a grid-connected control method, device, equipment and medium of a wind generating set, and belongs to the field of wind power generation. The method comprises the following steps: before grid connection of a wind generating set, decomposing based on the obtained grid voltage to obtain a first voltage value for controlling the output of a grid-side inverter; obtaining a q-axis compensation current value according to the electric energy parameter of the filter circuit; controlling the grid-side inverter based on the first addition of the q-axis compensation current value and the reactive current given value, the first voltage value and the target phase of the grid voltage so as to enable the output voltage of the filter circuit to be consistent with the amplitude and the phase of the grid voltage; and controlling the grid connection of the wind generating set. According to the embodiment of the application, the safety of the wind generating set can be improved.

Description

Grid-connected control method, device, equipment and medium of wind generating set
Technical Field
The application belongs to the field of wind power generation, and particularly relates to a grid-connected control method, device, equipment and medium of a wind generating set.
Background
With the continuous development of wind power technology, the capacity of a wind generating set is also increased, the output of a converter of the wind generating set has the problem of high-frequency harmonic waves, and in order to weaken and even eliminate the high-frequency harmonic waves, the capacity of a filter circuit connected with an output end of the converter is required to be increased.
Fig. 1 is a schematic structural diagram of an example of a wind turbine generator system in the prior art, as shown in fig. 1, the wind turbine generator system may include a mechanical transmission structure 11, a generator 12, a machine side rectifier 13, a grid side inverter 14, and a filter circuit 15 electrically connected to an output terminal of the grid side inverter 14. The filter circuit 15 may include an inductor, a capacitor, and the like, and the specific structure of the filter circuit 15 is not limited herein, and for example, the filter capacitor may include an LC circuit. The filter circuit may be electrically connected to a grid 17 through a grid-tie switch 16. When the grid-connected switch 16 is closed, the wind generating set is connected with the grid; with the grid-tie switch 16 off, the wind turbine generator system is off-grid.
However, at the moment of grid connection of the wind generating set, the filter circuit is equivalent to short circuit, and large grid connection impact current can be generated, so that huge safety risks are brought to the wind generating set. For example, fig. 2 is a schematic diagram of an example of grid-connected surge current generated by grid connection, the abscissa is time, the ordinate is current, as shown in fig. 2, at the moment of grid connection, the wind generating set generates grid-connected surge current exceeding 1000A (amperes), and the normal and stable current is less than 500A, so that the high grid-connected surge current can bring about a huge safety risk to the wind generating set.
Disclosure of Invention
The embodiment of the application provides a grid-connected control method, device, equipment and medium for a wind generating set, which can improve the safety of the wind generating set.
In a first aspect, an embodiment of the present application provides a grid-connected control method of a wind generating set, where the wind generating set includes a grid-side inverter and a filter circuit electrically connected to an output end of the grid-side inverter, and the method includes: before grid connection of a wind generating set, decomposing based on the obtained grid voltage to obtain a first voltage value for controlling the output of a grid-side inverter; obtaining a q-axis compensation current value according to the electric energy parameter of the filter circuit; controlling the grid-side inverter based on the first addition of the q-axis compensation current value and the reactive current given value, the first voltage value and the target phase of the grid voltage so as to enable the output voltage of the filter circuit to be consistent with the amplitude and the phase of the grid voltage; and controlling the grid connection of the wind generating set.
In a second aspect, an embodiment of the present application provides a grid-connected control device of a wind generating set, which is applied to a wind generating set, where the wind generating set includes a grid-side inverter, and a filter circuit electrically connected to an output end of the grid-side inverter, and the device includes: the voltage decomposition module is used for decomposing and obtaining a first voltage value for controlling the output of the grid-side inverter based on the acquired grid voltage before grid connection of the wind generating set; the q-axis current compensation module is used for obtaining a q-axis compensation current value according to the electric energy parameter of the filter circuit; the inverter control module is used for controlling the grid-side inverter based on the first summation of the q-axis compensation current value and the reactive current given value, the first voltage value and the target phase of the grid voltage so as to enable the output voltage of the filter circuit to be consistent with the amplitude and the phase of the grid voltage; and the grid-connected control module is used for controlling the grid connection of the wind generating set.
In a third aspect, an embodiment of the present application provides a grid-connected control device of a wind generating set, including: a processor and a memory storing computer program instructions; and when the processor executes the computer program instructions, the grid-connected control method of the wind generating set in the first aspect is realized.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium, where computer program instructions are stored, where the computer program instructions, when executed by a processor, implement a grid-connected control method of the wind turbine generator system of the first aspect.
The embodiment of the application provides a grid-connected control method, device, equipment and medium for a wind generating set, wherein before the wind generating set is connected, the acquired grid voltage is decomposed to obtain a first voltage value, a q-axis compensation current value is obtained according to electric energy parameters of a filter circuit in the wind generating set, and a grid-side inverter is controlled based on first summation of the q-axis compensation current value and a reactive current given value, the first voltage value and a target phase of the grid voltage. The q-axis compensation current value can compensate the difference of the output voltage of the filter circuit and the power grid voltage in phase, and the amplitude and the phase of the output voltage of the filter circuit and the power grid voltage are consistent through current inner loop control. Under the condition that the amplitude and the phase of the output voltage of the filter circuit are consistent with those of the power grid voltage, the wind generating set is controlled to be connected with the grid, so that grid-connected impact current at the moment of grid connection is eliminated, grid connection can be performed stably, and the safety of the wind generating set is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of an example of a prior art wind turbine generator system;
FIG. 2 is a schematic diagram of an example of grid-tied inrush current generated by a grid-tie in the prior art;
FIG. 3 is a flowchart of a method for grid-connected control of a wind turbine generator system according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an example of the current of a wind turbine generator set employing a grid-tie control method for a wind turbine generator set in an embodiment of the present application;
FIG. 5 is a flowchart of a method for grid-tie control of a wind turbine generator system according to another embodiment of the present disclosure;
FIG. 6 is a logic diagram of an example of grid-tie control of a wind turbine generator system according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of a grid-connected control device of a wind turbine generator system according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a grid-connected control device of a wind turbine generator system according to an embodiment of the present disclosure.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.
With the continuous development of wind power technology, the capacity of a wind generating set is also increased continuously, and the output of a converter of the wind generating set has the problem of high-frequency harmonic waves. In order to attenuate and even eliminate high frequency harmonics, it is necessary to increase the capacity of the filter circuit to which the output of the converter is connected. However, under the condition that the capacity of the filter circuit is large, the filter circuit is equivalent to a short circuit at the moment of grid connection of the wind generating set, and large grid connection impact current can be generated, so that a huge safety risk is brought to the wind generating set.
The application provides a grid-connected control method, device, equipment and medium for a wind generating set, which are applied to the wind generating set, and can realize grid-connected control of the wind generating set by controlling a grid-side inverter of the wind generating set, so that grid-connected impact current is greatly reduced, and even eliminated.
The grid-connected control method, device, equipment and medium of the wind generating set provided by the application are respectively described below.
The first aspect of the present application provides a grid-connected control method of a wind turbine generator system, which can be applied to the wind turbine generator system, and related content of the wind turbine generator system can be referred to the related description above, and will not be described herein. The wind generating set can comprise a direct-drive wind generating set, a semi-direct-drive wind generating set, a doubly-fed asynchronous wind generating set and an asynchronous wind generating set; low voltage class wind power generation sets and medium and high voltage class wind power generation sets can also be included. The generators of the direct-drive wind generating set and the semi-direct-drive wind generating set can comprise a permanent magnet synchronous generator and an electric excitation synchronous generator according to an excitation mode. The asynchronous generator may include a squirrel cage type asynchronous generator and a wound type asynchronous generator according to a rotor structure. That is, the grid-connected control method of the wind generating set provided by the embodiment of the application can be applied to wind generating sets with various types and various voltage levels, and grid-connected impact current of the wind generating set can be reduced or even eliminated. The grid-connected control method of the wind generating set can be executed by grid-connected control devices and equipment of the wind generating set, such as a controller, a control module/unit, special equipment and the like, and is not limited herein. Fig. 3 is a flowchart of a grid-connected control method of a wind turbine generator set according to an embodiment of the present application, where, as shown in fig. 3, the grid-connected control method of a wind turbine generator set may include steps S301 to S304.
In step S301, before the wind turbine generator system is connected to the grid, a first voltage value for controlling the output of the grid-side inverter is obtained based on the obtained grid voltage decomposition.
Before grid connection of the wind generating set, the power grid voltage can be obtained and decomposed, so that a first voltage value is obtained. The first voltage value may be used to control the output of the grid-side inverter. In some examples, the grid voltage decomposition may result in corresponding q-axis voltages and d-axis voltages, i.e., the first voltage value may include the decomposed values of the corresponding q-axis voltages and d-axis voltages.
In step S302, a q-axis compensation current value is obtained according to the power parameter of the filter circuit.
The filter circuit may include a filter device, which may include a filter inductance, a filter capacitance, and the like. The power parameter of the filter circuit may comprise a power parameter of the filter device. The electric energy can change to a certain extent through the filter circuit, and the change can enable the phase difference between the output voltage of the filter circuit and the power grid voltage to occur. In the embodiment of the application, the q-axis compensation current obtained according to the electric energy parameter of the filter circuit can compensate the deviation of the phase between the output voltage of the filter circuit and the power grid voltage.
In step S303, the grid-side inverter is controlled based on the first addition of the q-axis compensation current value and the reactive current set point, the first voltage value, and the target phase of the grid voltage so that the output voltage of the filter circuit coincides with the amplitude and phase of the grid voltage.
The first sum is the sum of the q-axis compensation current value and the reactive current given value. The reactive current set point is a reactive current set point, which can be set in advance according to the scene and the requirement, and is not limited herein. The target phase is the phase of the grid voltage and can be obtained by locking the grid voltage through a phase-locked loop.
Based on the first sum, the first voltage value and the target phase, a control signal for controlling the network side inverter can be obtained, and the control signal can be used for driving a switching device in the network side inverter to control the network side inverter. The q-axis compensation current value in the first summation can compensate the difference between the output voltage of the filter circuit and the phase of the power grid voltage, so that the output voltage of the filter circuit is consistent with the amplitude and the phase of the power grid voltage.
In step S304, the wind turbine generator set is controlled to grid-connect.
After the amplitude and the phase of the output voltage of the filter circuit are consistent with those of the grid voltage through the control of the grid-side inverter, the grid connection of the wind generating set is controlled, and particularly the grid connection switch can be controlled to be closed. The embodiment of the application adopts a current inner loop control mode for the grid-side inverter, namely, the grid connection of the wind generating set is controlled under the current inner loop control mode.
Before the wind generating set is connected, the amplitude and the phase of the output voltage of the filter circuit are consistent with those of the power grid voltage, so that the grid-connected impact current of the wind generating set cannot be generated at the moment of grid connection. For example, fig. 4 is a schematic diagram of an example of current of a wind turbine generator system using a grid-connected control method of a wind turbine generator system according to an embodiment of the present application, where the experimental environment of grid connection in fig. 4 is the same as the experimental environment of grid connection in fig. 1, as shown in fig. 4, by using the grid-connected control method of a wind turbine generator system according to an embodiment of the present application, current does not suddenly increase at the moment of grid connection, current before grid connection, at the moment of grid connection, after grid connection is very stable, and all the current is below 400A, thereby realizing a smooth transition of the wind turbine generator system from off-grid to grid connection. Under the condition that grid-connected impact current is not generated, the safety of the wind generating set can be greatly improved.
In the embodiment of the application, before grid connection of the wind generating set, the acquired grid voltage is decomposed to obtain a first voltage value, a q-axis compensation current value is obtained according to the electric energy parameter of a filter circuit in the wind generating set, and the grid-side inverter is controlled based on first summation of the q-axis compensation current value and a reactive current given value, the first voltage value and a target phase of the grid voltage. The q-axis compensation current value can compensate the difference of the output voltage of the filter circuit and the power grid voltage in phase, and the amplitude and the phase of the output voltage of the filter circuit and the power grid voltage are consistent through current inner loop control. Under the condition that the amplitude and the phase of the output voltage of the filter circuit are consistent with those of the power grid voltage, the wind generating set is controlled to be connected with the grid, so that grid-connected impact current at the moment of grid connection is eliminated, grid connection can be performed stably, and the safety of the wind generating set is improved. In the current inner loop control mode, the q-axis is a reactive axis, no active power is consumed, the current control is very stable, and the stability of the wind generating set can be improved. In addition, the grid-connected control method of the wind generating set does not need to increase hardware additionally, and does not generate extra hardware cost.
In some embodiments, the filter circuit may include a filter inductor electrically connected to the output terminal of the grid-side inverter, and a filter capacitor electrically connected to the filter inductor, where the output terminal of the filter circuit includes an end of the filter capacitor electrically connected to the filter inductor, and the end of the filter capacitor electrically connected to the filter inductor may be regarded as an output terminal of the wind generating set. The first voltage value may include a decomposition value of a q-axis voltage and a decomposition value of a d-axis voltage obtained by decomposing the grid voltage, and the first voltage value may make the output voltage of the grid-side inverter coincide with the amplitude and the phase of the grid voltage.
Fig. 5 is a flowchart of a grid-connected control method of a wind turbine generator system according to another embodiment of the present application, where the difference between fig. 5 and fig. 3 is that step S302 in fig. 3 may be specifically subdivided into step S3021 in fig. 5, step S303 in fig. 3 may be specifically subdivided into step S3031 and step S3032 in fig. 5, and the grid-connected control method of a wind turbine generator system shown in fig. 5 further includes step S305.
In step S3021, a q-axis compensation current value is obtained from the voltage drop value of the filter inductance and the current value of the filter capacitance.
Under the condition that the phase and amplitude of the output voltage of the grid-side inverter are consistent with those of the grid voltage, the electric energy output by the grid-side inverter can change after passing through the filter inductor and the filter capacitor, so that the phase of the output voltage of the filter circuit and the grid voltage is deviated. In the embodiment of the application, the q-axis compensation current value capable of compensating the phase deviation caused by the filter inductance and the filter capacitance can be calculated according to the voltage drop value of the filter inductance and the current value of the filter capacitance.
In some examples, since both the filter inductance and the filter capacitance in the filter circuit in the wind turbine are fixed, the voltage drop value of the filter inductance and the current value of the filter capacitance in the same type of wind turbine are also generally fixed, and correspondingly, the calculated q-axis compensation current value is also generally fixed. The q-axis compensation current value can be calculated before the first grid connection of the wind generating set, the q-axis compensation current value can be directly utilized for compensation before the wind generating set is connected again in the future, the grid-side inverter is controlled, and the wind generating set is controlled to be connected after the output voltage of the filter circuit is consistent with the amplitude and the phase of the grid voltage.
In step S3031, a q-axis compensation voltage value is obtained by a proportional integral regulator according to the first addition.
The first sum may be input to a proportional integral regulator (i.e., PI regulator) that may output a q-axis compensation voltage value.
In step S305, a d-axis compensation voltage value is obtained by a proportional integral regulator according to the fourth sum of the set d-axis compensation current value and the active current given value.
In the embodiment of the present application, the d-axis compensation current value is 0. The fourth sum is the sum of the d-axis compensation current and the active current given value, and because the d-axis compensation current is 0, the value of the fourth sum is actually the active current given value. The active current set point is a set point of the active current, and may be set in advance according to a scene, a demand, or the like, and is not limited herein. The d axis is an active axis, the grid-side inverter operates in a current inner loop mode in the starting process and the grid connection, the d axis compensation current value is set to 0, the conditions of current jump and overmodulation cannot occur in the grid connection state, the stable transition of the wind generating set from off-grid to grid connection is realized, and the grid connection stability of the wind generating set is further improved.
In step S3032, the grid-side inverter is controlled based on the second addition of the q-axis compensation voltage value and the decomposition value of the q-axis voltage, the third addition of the decomposition value of the d-axis voltage and the obtained d-axis compensation voltage value, and the target phase.
The second sum is a sum of the q-axis compensation voltage value and a decomposition value of the q-axis voltage. The third sum is the sum of the decomposition value of the d-axis voltage and the d-axis compensation voltage value. The second summation and the third summation and the target phase can control the grid-side inverter to output corresponding electric energy, and the output voltage of the electric energy after passing through the filter circuit is consistent with the amplitude and the phase of the grid voltage.
For ease of understanding, the logic of grid-tie control of a wind turbine is described below by way of an example. Fig. 6 is a logic schematic diagram of an example of grid-connected control of a wind turbine generator system according to an embodiment of the present application, where, as shown in fig. 6, an active current given value id_ref is added to a d-axis compensation current value and then input to a proportional-integral regulator 1, and an output of the proportional-integral regulator 1 is added to a decomposition value ud of a d-axis voltage; the reactive current given value iq_ref is added with the q-axis compensation current value and then is input into a proportional integral regulator 2, and the output of the proportional integral regulator 2 is added with the decomposition value uq of the q-axis voltage; the output of the proportional-integral regulator 1 is summed with the decomposition value ud of the d-axis voltage, the output of the proportional-integral regulator 2 is summed with the decomposition value uq of the q-axis voltage, and the sum is combined with the target phase theta of the phase-locked loop locked grid voltage output to control the grid-side inverter AC/DC so that the grid-side inverter AC/DC outputs the electric energy ubc. The electric energy ubc is input into a filter circuit, and the output voltage of the filter circuit is consistent with the amplitude and the phase of the power grid voltage.
In some embodiments, before the step S303, the d-axis voltage may be controlled to gradually increase from 0 to the decomposition value of the q-axis voltage, that is, the d-axis voltage is set in a slope manner, so that the voltage of the filter capacitor in the filter circuit is slowly built up, so that no current impact occurs in the starting process of the wind turbine generator system, and the safety of the wind turbine generator system in the starting process is ensured.
The second aspect of the present application provides a grid-connected control device of a wind generating set, which can be applied to a wind generating set, and details of the wind generating set can be referred to the related descriptions in the above embodiments, and are not described herein again. Fig. 7 is a schematic structural diagram of a grid-connected control device of a wind generating set according to an embodiment of the present application, and as shown in fig. 7, the grid-connected control device 400 of a wind generating set may include a voltage decomposition module 401, a q-axis current compensation module 402, an inverter control module 403, and a grid-connected control module 404.
The voltage decomposition module 401 may be configured to obtain, based on the obtained grid voltage, a first voltage value for controlling the output of the grid-side inverter before the wind generating set is connected to the grid.
The q-axis current compensation module 402 may be configured to obtain a q-axis compensation current value according to the power parameter of the filter circuit.
The inverter control module 403 may be configured to control the grid-side inverter based on the first sum of the q-axis compensation current value and the reactive current setpoint, the first voltage value, and the target phase of the grid voltage, so as to make the output voltage of the filter circuit coincide with the amplitude and the phase of the grid voltage.
The grid-tie control module 404 may be used to control the wind turbine generator system grid-tie.
In the embodiment of the application, before grid connection of the wind generating set, the acquired grid voltage is decomposed to obtain a first voltage value, a q-axis compensation current value is obtained according to the electric energy parameter of a filter circuit in the wind generating set, and the grid-side inverter is controlled based on first summation of the q-axis compensation current value and a reactive current given value, the first voltage value and a target phase of the grid voltage. The q-axis compensation current value can compensate the difference of the output voltage of the filter circuit and the power grid voltage in phase, and the amplitude and the phase of the output voltage of the filter circuit and the power grid voltage are consistent through current inner loop control. Under the condition that the amplitude and the phase of the output voltage of the filter circuit are consistent with those of the power grid voltage, the wind generating set is controlled to be connected with the grid, so that grid-connected impact current at the moment of grid connection is eliminated, grid connection can be performed stably, and the safety of the wind generating set is improved. In the current inner loop control mode, the q-axis is a reactive axis, no active power is consumed, the current control is very stable, and the stability of the wind generating set can be improved. In addition, the grid-connected control method of the wind generating set does not need to increase hardware additionally, and does not generate extra hardware cost.
In some examples, the filter circuit includes a filter inductor electrically connected to the output of the grid-side inverter, and a filter capacitor electrically connected to the filter inductor, the output of the filter circuit including an end of the filter capacitor electrically connected to the filter inductor. The q-axis current compensation module 402 may be specifically configured to: and obtaining a q-axis compensation current value according to the voltage drop value of the filter inductor and the current value of the filter capacitor.
In some examples, the first voltage value includes a decomposition value of a q-axis voltage and a decomposition value of a d-axis voltage corresponding to the grid voltage for matching an output voltage of the grid-side inverter to a magnitude, phase of the grid voltage.
In some examples, the inverter control module 403 may be specifically configured to: according to the first addition, a q-axis compensation voltage value is obtained through a proportional integral regulator; and controlling the grid-side inverter based on the second addition of the q-axis compensation voltage value and the decomposition value of the q-axis voltage, the third addition of the decomposition value of the d-axis voltage and the obtained d-axis compensation voltage value, and the target phase, wherein the target phase is obtained by locking the grid voltage through the phase-locked loop.
In some embodiments, the grid-connected control device 400 of the wind generating set may further include a d-axis compensation voltage module. The d-axis compensation voltage module may be used to: and obtaining a d-axis compensation voltage value through a proportional integral regulator according to the fourth addition of the set d-axis compensation current value and the active current given value before controlling the grid-side inverter based on the second addition of the q-axis compensation voltage value and the decomposition value of the q-axis voltage, the third addition of the decomposition value of the d-axis voltage and the obtained d-axis compensation voltage value and the target phase, wherein the d-axis compensation current value is 0.
In some embodiments, the grid-connected control device 400 of the wind generating set may further include a d-axis voltage control module. The d-axis voltage control module may be configured to: the d-axis voltage is controlled to step up from 0 to the decomposition value of the q-axis voltage.
In some examples, grid-tie control module 404 may be configured to: and controlling the grid connection of the wind generating set in a current inner loop control mode.
A third aspect of the present application provides a grid-connected control device of a wind turbine generator system. Fig. 8 is a schematic structural diagram of a grid-connected control device of a wind turbine generator system according to an embodiment of the present disclosure. As shown in fig. 8, the grid-connected control device 500 of the wind turbine generator system includes a memory 501, a processor 502, and a computer program stored on the memory 501 and executable on the processor 502.
In some examples, the processor 502 described above may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits of embodiments of the present application.
Memory 501 may include Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic disk storage media devices, optical storage media devices, flash Memory devices, electrical, optical, or other physical/tangible Memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors) it is operable to perform the operations described with reference to a grid tie control method of a wind turbine generator set in accordance with embodiments of the present application.
The processor 502 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 501 for realizing the grid-connected control method of the wind turbine generator system in the above-described embodiment.
In some examples, grid-tie control device 500 of a wind turbine generator system may also include a communication interface 503 and a bus 504. As shown in fig. 8, the memory 501, the processor 502, and the communication interface 503 are connected to each other via a bus 504 and perform communication with each other.
The communication interface 503 is mainly used to implement communication between each module, apparatus, unit and/or device in the embodiments of the present application. Input devices and/or output devices may also be accessed through communication interface 503.
Bus 504 includes hardware, software, or both, that couple components of grid-tie control device 500 of a wind turbine generator set to one another. By way of example, and not limitation, bus 504 may include an accelerated graphics port (Accelerated Graphics Port, AGP) or other graphics Bus, an enhanced industry standard architecture (Enhanced Industry Standard Architecture, EISA) Bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an industry standard architecture (Industry Standard Architecture, ISA) Bus, an Infiniband interconnect, a Low Pin Count (LPC) Bus, a memory Bus, a micro channel architecture (Micro Channel Architecture, MCa) Bus, a peripheral component interconnect (Peripheral Component Interconnect, PCI) Bus, a PCI-Express (PCI-E) Bus, a serial advanced technology attachment (Serial Advanced Technology Attachment, SATA) Bus, a video electronics standards association local (Video Electronics Standards Association Local Bus, VLB) Bus, or other suitable Bus, or a combination of two or more of these. Bus 504 may include one or more buses, where appropriate. Although embodiments of the present application describe and illustrate a particular bus, the present application contemplates any suitable bus or interconnect.
The grid-connected control device of the wind turbine generator system and the grid-connected control apparatus of the wind turbine generator system in the above embodiments may be implemented as a controller or other devices or apparatuses provided inside or outside the wind turbine generator system, which are not limited herein.
In a fourth aspect of the present application, a computer readable storage medium is provided, where computer program instructions are stored on the computer readable storage medium, and when the computer program instructions are executed by a processor, the method for controlling grid connection of a wind turbine generator set in the foregoing embodiment may be implemented, and the same technical effects may be achieved, so that repetition is avoided, and details are not repeated here. The computer readable storage medium may include a non-transitory computer readable storage medium, such as Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, and the like, but is not limited thereto.
The embodiment of the application provides a computer program product, when instructions in the computer program product are executed by a processor of an electronic device, the electronic device can execute the grid-connected control method of the wind turbine generator set in the embodiment, and the same technical effects can be achieved, so that repetition is avoided, and redundant description is omitted.
It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. For an apparatus embodiment, a device embodiment, a computer readable storage medium embodiment, a computer program product embodiment, the relevant points may be found in the description of method embodiments. The present application is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may, after appreciating the spirit of the present application, make various changes, modifications and additions, or change the order between steps. Also, a detailed description of known method techniques is omitted here for the sake of brevity.
Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to being, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware which performs the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Those skilled in the art will appreciate that the above-described embodiments are exemplary and not limiting. The different technical features presented in the different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in view of the drawings, the description, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the word "a" does not exclude a plurality; the terms "first," "second," and the like, are used for designating a name and not for indicating any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various elements presented in the claims may be implemented by means of a single hardware or software module. The presence of certain features in different dependent claims does not imply that these features cannot be combined to advantage.

Claims (10)

1. The utility model provides a grid-connected control method of wind generating set, is applied to wind generating set, wind generating set includes net side dc-to-ac converter, and the filter circuit who is connected with net side dc-to-ac converter's output electricity, characterized in that, the method includes:
before grid connection of a wind generating set, decomposing based on the obtained grid voltage to obtain a first voltage value for controlling the output of the grid-side inverter;
obtaining a q-axis compensation current value according to the electric energy parameter of the filter circuit;
controlling the grid-side inverter based on the first sum of the q-axis compensation current value and the reactive current given value, the first voltage value and the target phase of the grid voltage so as to enable the output voltage of the filter circuit to be consistent with the amplitude and the phase of the grid voltage;
controlling the wind generating set to be connected with the grid;
wherein the filter circuit comprises a filter inductor electrically connected with the output end of the grid-side inverter and a filter capacitor electrically connected with the filter inductor, the output end of the filter circuit comprises one end of the filter capacitor electrically connected with the filter inductor,
the q-axis compensation current value is obtained according to the electric energy parameter of the filter circuit, and the q-axis compensation current value comprises:
and obtaining the q-axis compensation current value according to the voltage drop value of the filter inductor and the current value of the filter capacitor.
2. The method according to claim 1, wherein the first voltage value includes a decomposition value of a q-axis voltage and a decomposition value of a d-axis voltage corresponding to the grid voltage, for making an output voltage of a grid-side inverter coincide with a magnitude and a phase of the grid voltage.
3. The method of claim 2, wherein the controlling the grid-side inverter based on the first sum of the q-axis compensation current value and the reactive current setpoint, the first voltage value, and a target phase of a grid voltage comprises:
according to the first addition, a q-axis compensation voltage value is obtained through a proportional integral regulator;
and controlling the grid-side inverter based on the second addition of the q-axis compensation voltage value and the decomposition value of the q-axis voltage, the third addition of the decomposition value of the d-axis voltage and the obtained d-axis compensation voltage value, and the target phase, wherein the target phase is obtained by locking the grid voltage through a phase-locked loop.
4. The method according to claim 3, characterized by further comprising, before the controlling the grid-side inverter based on the second addition of the q-axis compensation voltage value and the decomposition value of the q-axis voltage, the third addition of the decomposition value of the d-axis voltage and the obtained d-axis compensation voltage value, and the target phase:
and obtaining the d-axis compensation voltage value through a proportional integral regulator according to the fourth addition of the set d-axis compensation current value and the active current given value, wherein the d-axis compensation current value is 0.
5. The method according to claim 2, further comprising, before the controlling the grid-side inverter based on the first addition of the q-axis compensation current value and the reactive current set point, the first voltage value, and a target phase of a grid voltage:
and controlling the d-axis voltage to gradually increase from 0 to the decomposition value of the q-axis voltage.
6. The method of claim 1, wherein said controlling said wind turbine generator set to grid comprises:
and controlling the wind generating set to grid in a current inner loop control mode.
7. The method of claim 1, wherein the wind power generator set comprises a direct drive wind power generator set, a semi-direct drive wind power generator set, a doubly fed asynchronous wind power generator set, and an asynchronous wind power generator set.
8. A grid-connected control device of a wind generating set, applied to the wind generating set, the wind generating set comprises a grid-side inverter and a filter circuit electrically connected with an output end of the grid-side inverter, the device is characterized by comprising:
the voltage decomposition module is used for decomposing and obtaining a first voltage value for controlling the output of the grid-side inverter based on the acquired grid voltage before grid connection of the wind generating set;
the q-axis current compensation module is used for obtaining a q-axis compensation current value according to the electric energy parameter of the filter circuit;
the inverter control module is used for controlling the grid-side inverter based on the first sum of the q-axis compensation current value and the reactive current given value, the first voltage value and the target phase of the grid voltage so as to enable the output voltage of the filter circuit to be consistent with the amplitude and the phase of the grid voltage;
the grid-connected control module is used for controlling the wind generating set to be grid-connected;
wherein the filter circuit comprises a filter inductor electrically connected with the output end of the grid-side inverter and a filter capacitor electrically connected with the filter inductor, the output end of the filter circuit comprises one end of the filter capacitor electrically connected with the filter inductor,
the q-axis current compensation module is specifically configured to: and obtaining the q-axis compensation current value according to the voltage drop value of the filter inductor and the current value of the filter capacitor.
9. Grid-connected control equipment of wind generating set, characterized by, include: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a grid-tie control method for a wind turbine generator set according to any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon computer program instructions, which when executed by a processor, implement a grid-tie control method of a wind power plant according to any of claims 1 to 7.
CN202310546251.9A 2023-05-16 2023-05-16 Grid-connected control method, device, equipment and medium of wind generating set Active CN116260191B (en)

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