CN113162436A - Wind power converter control method - Google Patents
Wind power converter control method Download PDFInfo
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- CN113162436A CN113162436A CN202110309923.5A CN202110309923A CN113162436A CN 113162436 A CN113162436 A CN 113162436A CN 202110309923 A CN202110309923 A CN 202110309923A CN 113162436 A CN113162436 A CN 113162436A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a control method of a wind power converter, wherein the wind power converter comprises a grid-side converter, a machine-side converter, a grid-side controller and a machine-side controller, wherein the grid-side controller controls the grid-side converter to adopt three-level single-polarity wave emission; the machine side controller controls the machine side converter to adopt bipolar wave transmission in a first working state, and controls the machine side converter to adopt unipolar wave transmission in a second state; the wind power converter control method can reduce three-level topology direct current bus voltage ripples, simultaneously keeps the advantages of small current harmonic waves at the side of a three-level topology network, small machine side voltage du/dt and small voltage spike, and does not increase the cost and the size of the converter.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a control method of a wind power converter.
Background
The increase of the capacity of a single machine is one of the development trends of the current wind turbine, with the increase of the capacity of the wind turbine, the input and output currents are larger and larger, which results in the problems of increasing the cost of cables, twisting cables and the like, and in order to reduce the current, the voltage levels of a motor, a converter and a transformer of the wind turbine need to be improved, for example, from 690V, which is commonly used at present, to 1140V and 3300V. For 1140V and 3300V voltage grades, the wind power converter generally adopts a three-level topology, and the three-level topology can adopt power semiconductor devices such as IGBTs with lower voltage grades, and can also reduce input and output current harmonics, and reduce voltage du/dt and voltage spikes applied to the motor.
At present, a space vector modulation or carrier wave stacking wave sending mode is generally adopted in a three-level topology, and due to the inherent characteristics of the three-level topology, a network side three-level converter and a machine side three-level converter respectively generate large currents which are 3 times of the working frequency of the three-level converter and the machine side three-level converter at the midpoint of a bus, the voltage ripples of a positive bus and a negative bus are correspondingly large, especially when the working frequency of a motor is low and the power factor is low, the voltage ripples of the bus are large, the service life of a bus capacitor can be reduced, and 3-time-doubled bus ripples caused by the machine side converter can cause inter-harmonics on the network side to pollute the power grid and influence the working stability of the network side converter.
The prior art generally adopts a method of increasing the capacity of a bus capacitor or adding a balancing circuit to reduce the bus voltage ripple, but the measures can increase the cost and the volume of the converter.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wind power converter control method, which can reduce the voltage ripple of a three-level topological direct current bus, simultaneously keep the advantages of small current harmonic wave at the side of a three-level topological network, small machine side voltage du/dt and small voltage spike, and can not increase the cost and the volume of the converter.
In order to solve the technical problem, the invention provides a control method of a wind power converter, wherein the wind power converter comprises a grid-side converter, a machine-side converter, a grid-side controller and a machine-side controller, and the grid-side controller controls the grid-side converter to adopt three-level unipolar wave emission; the machine side controller controls the machine side converter to adopt bipolar wave sending in a first working state, and the machine side controller controls the machine side converter to adopt unipolar wave sending in a second state.
Preferably, the single-polarity wave-transmitting mode adopted by the network-side converter is as follows: the grid-side converter outputs a positive level and a zero level in a positive half cycle of a grid-side reference voltage, and the grid-side converter outputs a negative level and a zero level in a negative half cycle of the grid-side reference voltage.
Preferably, the network-side controller controls a wave-transmitting mode of the network-side converter through the network-side modulator, in the unipolar wave-transmitting mode, the network-side controller generates a driving signal of a three-level power tube of the network-side converter by comparing the network-side reference voltage with a first carrier and a second carrier generated by the network-side modulator so as to obtain a unipolar output level, and a relationship between the first carrier and the second carrier generated by the network-side modulator is a stacked relationship.
Preferably, the stacking relationship is: the minimum value of the first carrier wave generated by the network side modulator is equal to the maximum value of the second carrier wave generated by the network side modulator.
Preferably, the machine side converter adopts a bipolar wave-transmitting mode as follows: the machine side converter outputs a positive level, a negative level and a zero level in a positive half cycle of a machine side reference voltage, and outputs a positive level, a negative level and a zero level in a negative half cycle of the machine side reference voltage; the machine side converter adopts a unipolar wave-sending mode as follows: the machine side converter outputs positive and zero levels in the positive half cycle of the machine side reference voltage, and the machine side converter outputs negative and zero levels in the negative half cycle of the machine side reference voltage.
Preferably, the machine side controller controls a wave transmitting mode of the machine side converter through the machine side modulator, in a unipolar wave transmitting mode, the machine side controller uses the machine side reference voltage to compare with a first carrier and a second carrier generated by the network side modulator to generate a driving signal of a three-level power tube of the network side converter so as to obtain a unipolar output level, and a relationship between the first carrier and the second carrier generated by the network side modulator is a laminated relationship; in the bipolar wave transmitting mode, the machine side controller uses the machine side reference voltage to compare with a machine side first carrier and a machine side second carrier to generate a driving signal of a machine side converter three-level power tube so as to obtain a bipolar output level, and the relation between the first carrier and the second carrier generated by the machine side converter is an overlapping relation.
Preferably, the stacking relationship is: the minimum value of the first carrier generated by the machine side modulator is equal to the maximum value of the second carrier generated by the machine side modulator; the overlapping relationship is as follows: the minimum value of the first carrier generated by the machine side modulator is smaller than the maximum value of the second carrier generated by the machine side modulator, and the maximum value of the first carrier generated by the machine side modulator is larger than the maximum value of the second carrier generated by the machine side modulator.
Preferably, the first operating state is a state in which the output frequency is lower than a preset value, and the second operating state is a state in which the output frequency is higher than the preset value.
Preferably, the preset value is 5Hz to 30 Hz.
Preferably, the first state is a state in which the bus midpoint current is greater than a preset value, and the second state is a state in which the bus midpoint current is less than the preset value.
Preferably, the preset value is 10% to 99% of the output rated current.
Preferably, the first state is a state in which the absolute value of the instantaneous value of the reference voltage is greater than a preset value, and the second state is a state in which the absolute value of the instantaneous value of the reference voltage is less than a preset value.
Preferably, the preset value is 1% -99% of the voltage value of the direct current bus.
After the method is adopted, the wind power converter comprises a grid-side converter, a machine-side converter, a grid-side controller and a machine-side controller, wherein the grid-side controller controls the grid-side converter to adopt three-level single-polarity wave emission; the machine side controller controls the machine side converter to adopt bipolar wave transmission in a first working state, and controls the machine side converter to adopt unipolar wave transmission in a second state; the grid side controller outputs a grid side three-phase reference voltage, the grid side reference voltage is compared with a first carrier and a second carrier generated by the grid side modulator to generate driving signals of each IGBT of the grid side converter, and the machine side reference voltage is compared with the first carrier and the second carrier generated by the machine side regulator to generate driving signals of each IGBT of the three-level machine side converter; the wind power converter control method can reduce three-level topology direct current bus voltage ripples, simultaneously keeps the advantages of small current harmonic waves at the side of a three-level topology network, small machine side voltage du/dt and small voltage spike, and does not increase the cost and the size of the converter.
Drawings
FIG. 1 is an overall structural view of a wind power converter of the present invention;
FIG. 2 is a block diagram of a wind power converter and its controller and modulator according to the present invention;
FIG. 3 is a structural diagram of a three-level power tube of a wind power converter of the present invention;
FIG. 4 is a block diagram of a wind power converter modulator of the present invention;
FIG. 5 is a schematic diagram of the carrier generated by the network-side modulator or the machine-side modulator of the present invention stacked with a phase network-side reference voltage;
FIG. 6 is a schematic diagram of the overlap of the carrier generated by the machine side modulator of the present invention with a camera side reference voltage;
FIG. 7 is a flowchart of a first embodiment of a wind power converter control method according to the present invention;
FIG. 8 is a schematic diagram of an output voltage of a wind power converter control method according to an embodiment of the present invention;
FIG. 9 is a flowchart of a second embodiment of the wind power converter control method according to the present invention;
FIG. 10 is a flowchart of a third embodiment of a wind power converter control method according to the present invention;
fig. 11 is a schematic diagram of three output voltages of the wind power converter control method according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, fig. 2, fig. 7 and fig. 8, fig. 1 is an overall structural diagram of a wind power converter according to the present invention; FIG. 2 is a block diagram of a wind power converter and its controller and modulator according to the present invention; the embodiment discloses a wind power converter control method, which comprises the steps of providing a wind power converter, wherein the wind power converter comprises a grid-side converter, a machine-side converter, a grid-side controller and a machine-side controller, and the grid-side controller controls the grid-side converter to adopt three-level single-polarity wave emission; the machine side controller controls the machine side converter to adopt bipolar wave sending in a first working state, and controls the machine side converter to adopt unipolar wave sending in a second state.
Referring to fig. 3 to 5, fig. 3 is a structural diagram of a three-level power tube of a wind power converter according to the present invention; FIG. 4 is a block diagram of a wind power converter modulator of the present invention; FIG. 5 is a schematic diagram of the carrier generated by the network-side modulator or the machine-side modulator of the present invention stacked with a phase network-side reference voltage; the grid side controller outputs a grid side three-phase reference voltage, the grid side modulator adopts a carrier laminating mode, and the grid side reference voltage is compared with a first carrier and a second carrier generated by the grid side modulator to generate a driving signal of each IGBT of the grid side converter. The amplitudes of the first carrier and the second carrier generated by the network side modulator are equal, and the upper part and the lower part of the first carrier and the second carrier are in a laminated relation, namely the minimum value of the first carrier is equal to the maximum value of the second carrier; comparing the reference voltage of each phase with the first carrier wave to generate driving signals PWM1 and PWM3 corresponding to the phases Q1 and Q3, wherein the PWM1 is complementary with the PWM3, and certain dead time is set; the comparison of the reference voltage of each phase with the second carrier generates the driving signals PWM2, PWM4 corresponding to the phases Q2, Q4, where PWM2 is complementary to PWM4 and sets a certain dead time. According to the method, the voltage Vout of the midpoint O of each phase output pair bus capacitor is at a positive level and a zero level in the positive half cycle of the corresponding phase reference voltage, wherein the positive level voltage is a positive bus voltage Vdc + and the zero level voltage is zero; the voltage Vout of the midpoint O of each phase output pair bus capacitor is at a negative level and a zero level in the negative half cycle of the corresponding phase reference voltage, wherein the negative level voltage is a negative bus voltage Vdc-, and the zero level voltage is zero; since the positive and negative levels do not occur simultaneously in one carrier period, it is called unipolar hair wave.
The machine side controller outputs the machine side three-phase reference voltage, please refer to fig. 5, fig. 6, fig. 7 and fig. 8; FIG. 5 is a schematic diagram of the stacking of the carrier generated by the network-side modulator or the machine-side modulator of the present invention with a phase network-side reference voltage, and FIG. 6 is a schematic diagram of the stacking of the carrier generated by the machine-side modulator of the present invention with a phase network-side reference voltage; FIG. 7 is a flowchart of a first embodiment of a wind power converter control method according to the present invention; FIG. 8 is a schematic diagram of an output voltage of a wind power converter control method according to an embodiment of the present invention; and when the output frequency f of the machine side converter is less than or equal to a certain preset value, the three phases of the machine side modulator adopt the carrier overlapping mode, namely the machine side reference voltage is compared with the first carrier and the second carrier generated by the machine side regulator to generate driving signals of each IGBT of the three-level machine side converter. The amplitude of the first carrier and the amplitude of the second carrier generated by the machine side adjuster are equal, and the first carrier and the second carrier are in an overlapping relationship, namely the minimum value of the first carrier generated by the machine side adjuster is smaller than the maximum value of the second carrier, and the maximum value of the first carrier generated by the machine side adjuster is larger than the maximum value of the second carrier; comparing the reference voltage of each phase with the first carrier wave to generate driving signals PWM1 and PWM3 corresponding to the phases Q1 and Q3, wherein the PWM1 is complementary with the PWM3, and certain dead time is set; the comparison of the reference voltage of each phase with the second carrier generates the driving signals PWM2, PWM4 corresponding to the phases Q2, Q4, where PWM2 is complementary to PWM4 and sets a certain dead time. According to the method, the voltage Vout of the midpoint O of each phase of output counter bus capacitor is at the positive half cycle of the corresponding phase reference voltage, namely the positive level, the negative level and the zero level, and at the negative half cycle of the corresponding phase reference voltage, namely the positive level voltage is the positive bus voltage Vdc +, the zero level voltage is zero, and the negative level voltage is the negative bus voltage Vdc-; the wave is called bipolar wave generation because of the positive level and the negative level in one carrier wave period; the above-mentioned upper and lower relative relationship between the first carrier and the second carrier generated by the side modulator, i.e. Y in fig. 5, can be adjusted according to actual needs, and in general, it is assumed that the amplitude of the triangular carrier is 1, and Y can be set to be about 1.6.
Example two
The network side controller outputs a network side three-phase reference voltage, and the network side modulator adopts a carrier stacking mode; the machine side controller outputs machine side three-phase reference voltage, and the computer side converter calculates the virtual value of current bus midpoint current io in the following way: the three-phase output current of the machine side controller is respectively ia, ib and ic, the three-phase reference voltage is Vrefa, Vrefb and Vrefc, the total voltage of positive and negative direct current buses is Vdc, and the virtual value io of the midpoint current of the capacitance of the machine side bus is approximately equal to ia (1-2Vrefa/Vdc) + ib (1-2Vrefb/Vdc) + ic (1-2 Vrefc/Vdc).
Referring to fig. 9, fig. 9 is a flowchart of a second embodiment of a wind power converter control method according to the present invention; and calculating an effective value Iorms of the virtual value io of the point current in the capacitance of the machine side bus according to the instantaneous value of the virtual value io, wherein when the effective value Iorms is smaller than a certain preset value, the three phases of the machine side modulator adopt the carrier overlapping method, and when the effective value Iorms is larger than or equal to the certain preset value, the three phases of the machine side modulator adopt the carrier overlapping method of the first embodiment.
EXAMPLE III
Referring to fig. 10 and 11, fig. 10 is a flowchart of a third embodiment of a wind power converter control method according to the present invention; fig. 11 is a schematic diagram of three output voltages of the wind power converter control method according to the embodiment of the invention. The network side controller outputs a network side three-phase reference voltage, and the network side modulator adopts the carrier stacking mode of the first embodiment; the machine side controller outputs machine side three-phase reference voltage, when any phase reference voltage of the machine side converter is smaller than a preset value, the machine side modulator of the phase adopts the carrier overlapping mode described in the first embodiment, and when any phase reference voltage of the machine side converter is larger than or equal to the preset value, the machine side modulator of the phase adopts the carrier overlapping mode described in the first embodiment.
In order to improve the utilization rate of the bus bar voltage, the grid-side reference voltage or the machine-side three-phase reference voltage of the first embodiment may be injected with a corresponding third harmonic, and a typical injection method is to assume that the three-phase original reference voltages are Vrefa ', Vrefb', and Vrefc ', respectively, and the injected third harmonic is Vz ═ 0.5 max (Vrefa, Vrefb, Vrefc) -0.5 min (Vrefa, Vrefb, Vrefc), where max and min respectively represent maximum and minimum values, and finally the three-phase reference voltage is Vrefa ═ Vrefa' + Vz, Vrefb '+ Vz, and Vrefc ═ Vrefc' + Vz.
Other components can be injected into the three-phase reference voltage, or the reference voltage can be adjusted according to other requirements.
The superposition or adjustment of the reference voltage is part of the network side controller and the machine side controller, and the invention is not limited thereto.
The invention adopts unipolar wave generation for the grid-side converter of the wind power converter and adopts different wave generation modes for the machine side converter according to the working state of the machine side converter, thereby not only reducing the bus voltage ripple, but also keeping the advantages of small output voltage and current harmonic waves of the grid-side converter, small machine side du/dt and small peak of terminal voltage.
It should be understood that the above is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (13)
1. A wind power converter control method is characterized in that a wind power converter is provided, the wind power converter comprises a grid-side converter, a machine-side converter, a grid-side controller and a machine-side controller, and the grid-side controller controls the grid-side converter to adopt three-level single-polarity wave emission; the machine side controller controls the machine side converter to adopt bipolar wave sending in a first working state, and the machine side controller controls the machine side converter to adopt unipolar wave sending in a second state.
2. The wind power converter control method according to claim 1, wherein the grid-side converter adopts a unipolar wave generation mode as follows: the grid-side converter outputs a positive level and a zero level in a positive half cycle of a grid-side reference voltage, and the grid-side converter outputs a negative level and a zero level in a negative half cycle of the grid-side reference voltage.
3. The wind power converter control method according to claim 2, wherein the grid-side controller controls a wave generation mode of the grid-side converter through a grid-side modulator, in a unipolar wave generation mode, the grid-side controller generates a driving signal of a three-level power tube of the grid-side converter by comparing a first carrier wave and a second carrier wave generated by the grid-side modulator with the grid-side reference voltage to obtain a unipolar output level, and a relationship between the first carrier wave and the second carrier wave generated by the grid-side modulator is a stacked relationship.
4. The wind power converter control method according to claim 3, characterized in that the stacking relationship is: the minimum value of the first carrier wave generated by the network side modulator is equal to the maximum value of the second carrier wave generated by the network side modulator.
5. The wind power converter control method according to claim 1, wherein the machine side converter adopts a bipolar wave generation mode as follows: the machine side converter outputs a positive level, a negative level and a zero level in a positive half cycle of a machine side reference voltage, and outputs a positive level, a negative level and a zero level in a negative half cycle of the machine side reference voltage; the machine side converter adopts a unipolar wave-sending mode as follows: the machine side converter outputs positive and zero levels in the positive half cycle of the machine side reference voltage, and the machine side converter outputs negative and zero levels in the negative half cycle of the machine side reference voltage.
6. The wind power converter control method according to claim 5, characterized in that: the machine side controller controls a wave transmitting mode of a machine side converter through a machine side modulator, in a unipolar wave transmitting mode, the machine side controller uses the machine side reference voltage to compare with a first carrier and a second carrier generated by a network side modulator to generate a driving signal of a three-level power tube of the network side converter so as to obtain a unipolar output level, and a relation between the first carrier and the second carrier generated by the network side modulator is a laminated relation; in the bipolar wave transmitting mode, the machine side controller uses the machine side reference voltage to compare with a machine side first carrier and a machine side second carrier to generate a driving signal of a machine side converter three-level power tube so as to obtain a bipolar output level, and the relation between the first carrier and the second carrier generated by the machine side converter is an overlapping relation.
7. The wind power converter control method according to claim 6, wherein the stacking relationship is: the minimum value of the first carrier generated by the machine side modulator is equal to the maximum value of the second carrier generated by the machine side modulator; the overlapping relationship is as follows: the minimum value of the first carrier generated by the machine side modulator is smaller than the maximum value of the second carrier generated by the machine side modulator, and the maximum value of the first carrier generated by the machine side modulator is larger than the maximum value of the second carrier generated by the machine side modulator.
8. The wind power converter control method according to claim 1, wherein the first operating state is a state in which the output frequency is lower than a preset value, and the second operating state is a state in which the output frequency is higher than the preset value.
9. The wind power converter control method according to claim 8, wherein the preset value is 5Hz to 30 Hz.
10. The control method of the wind power converter according to claim 1, wherein the first state is a state where a bus midpoint current is greater than a preset value, and the second state is a state where the bus midpoint current is less than the preset value.
11. The wind power converter control method according to claim 10, wherein the preset value is 10% to 99% of the output rated current.
12. The wind power converter control method according to claim 1, wherein the first state is a state in which an absolute value of the instantaneous value of the reference voltage is greater than a predetermined value, and the second state is a state in which the absolute value of the instantaneous value of the reference voltage is less than the predetermined value.
13. The wind power converter control method according to claim 12, wherein the preset value is 1% to 99% of the dc bus voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110309923.5A CN113162436B (en) | 2021-03-23 | 2021-03-23 | Wind power converter control method |
Applications Claiming Priority (1)
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