CN112968614A - Wind power converter control method, power equipment control device and converter - Google Patents
Wind power converter control method, power equipment control device and converter Download PDFInfo
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- CN112968614A CN112968614A CN202110309864.1A CN202110309864A CN112968614A CN 112968614 A CN112968614 A CN 112968614A CN 202110309864 A CN202110309864 A CN 202110309864A CN 112968614 A CN112968614 A CN 112968614A
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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
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a wind power converter control method, which provides 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, the grid side controller controls the grid side converter to adopt three-level unipolar wave generation, the machine side controller controls the machine side converter to adopt three-level bipolar wave generation, and the wind power converter control method can reduce three-level topological direct current bus voltage ripples, simultaneously keeps the advantages of small three-level topological grid side current harmonic wave, small machine side voltage du/dt and small voltage spike, and does not increase the cost and the volume of the converter; meanwhile, the invention also discloses a power equipment control device and a 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 single-machine capacity increase is one of the development trends of the current wind turbine, with the capacity increase of the wind turbine, the input and output currents are larger and larger, which results in the problems of increasing the cable cost, twisting the cable and the like, in order to reduce the current, the voltage levels of the generator motor, the converter and the transformer need to be improved, for example, the voltage levels are improved from 690V commonly used at present to 1140V and 3300V, for the 1140V and 3300V voltage levels, the wind turbine converter generally adopts a three-level topology, the three-level topology can adopt power semiconductor devices such as IGBTs with lower voltage levels, and the like, and can also reduce the harmonic wave of the input and output currents, and reduce the voltage du/dt and the voltage spike applied to the.
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.
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 wind power converter control method, which 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, and the machine-side controller controls the machine-side converter to adopt three-level bipolar wave emission.
Preferably, the unipolar hair wave is: 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 unipolar wave-transmitting, 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 laminated 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, in the bipolar wave generation, 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 the machine side converter outputs a positive level, a negative level and a zero level in a 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 the bipolar wave transmitting, 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 three-level power tube of the machine side converter so as to obtain a bipolar output level, and the relationship between the first carrier and the second carrier generated by the machine side converter is an overlapping relationship.
Preferably, the overlapping relationship is: 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.
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 transmit waves by adopting three-level single polarity, and the machine-side controller controls the machine-side converter to transmit waves by adopting three-level bipolar; the grid side controller outputs a grid side three-phase reference voltage, the grid side modulator adopts a carrier laminating mode, 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 a grid side converter, the machine side modulator adopts a carrier overlapping mode, and the machine side reference voltage is compared with the first carrier and the second carrier generated by the machine side regulator to generate a driving signal of each IGBT of a 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 effect of a carrier generated by the grid-side modulator of the present invention and a grid-side reference voltage;
FIG. 6 is a schematic diagram of the effect of the carrier generated by the machine side modulator of the present invention and a camera side reference voltage.
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 and 2, 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 provides 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, the grid-side controller controls the grid-side converter to adopt three-level single-polarity wave emission, and the machine-side controller controls the machine-side converter to adopt three-level bipolar wave emission.
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 effect of a carrier generated by the grid-side modulator of the present invention and a grid-side reference voltage; the grid side controller outputs a grid side three-phase reference voltage, the grid side modulator adopts a carrier laminating mode, 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, wherein the amplitudes of the first carrier and the second carrier generated by the grid side modulator are equal, the upper part and the lower part are in a laminating 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; comparing the reference voltage of each phase network side with a second carrier to generate driving signals PWM2 and PWM4 corresponding to the phases Q2 and Q4, wherein the PWM2 is complementary with the PWM4, and a certain dead time is set; 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.
Fig. 6 is a schematic diagram illustrating the effect of the first carrier and the second carrier generated by the machine-side modulator according to the present invention on a reference voltage at the camera side; the machine side modulator adopts a carrier overlapping mode, the machine side reference voltage is compared with a first carrier and a second carrier generated by the machine side regulator to generate driving signals of all IGBTs of the three-level machine side converter, wherein the amplitudes of the first carrier and the second carrier generated by the machine side regulator are equal, the upper part and the lower part are in an overlapping relation, namely the minimum value of the first carrier generated by the machine side regulator is smaller than the maximum value of the second carrier, and the maximum value of the first carrier generated by the machine side regulator 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-; since there is both a positive and a negative level in one carrier period, it is called bipolar wave generation.
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 triangular carrier amplitude is 1, and Y can be set to be about 1.6.
Example two
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 different wave-generating modes aiming at the grid-side converter and the machine-side converter of the wind power converter, thereby not only reducing the voltage ripple of the bus, but also keeping the advantages of small output voltage and current harmonic of the grid-side converter and small machine-side du/dt and terminal voltage peak. .
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 (9)
1. The method for controlling the wind power converter is characterized by providing the 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, the grid-side controller controls the grid-side converter to adopt three-level single-polarity wave emission, and the machine-side controller controls the machine-side converter to adopt three-level bipolar wave emission.
2. The wind power converter control method according to claim 1, wherein the unipolar wave generation is: 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 the grid-side modulator, in unipolar wave generation, the grid-side controller generates a driving signal of a three-level power tube of the grid-side converter by comparing the grid-side reference voltage with a first carrier and a second carrier generated by the grid-side modulator so as to obtain a unipolar output level, and a relationship between the first carrier and the second carrier generated by the grid-side modulator is a laminated relationship.
4. The wind power converter control method of 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 of claim 1, characterized in that in said bipolar wave generation, said 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 said machine side converter outputs a positive level, a negative level and a zero level in a negative half cycle of a machine side reference voltage.
6. The wind power converter control method of claim 5, wherein: the machine side controller controls a wave transmitting mode of a machine side converter through a machine side modulator, in bipolar wave transmitting, 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 three-level power tube of the machine side converter so as to obtain a bipolar output level, and the relationship between the first carrier and the second carrier generated by the machine side converter is an overlapping relationship.
7. The wind power converter control method of claim 6, wherein the overlap relationship is: 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. A power equipment control device is characterized in that the power electronic equipment control device adopts the wind power converter control method of any one of the above 1 to 7.
9. The converter is characterized by comprising a grid-side converter and a machine-side converter, wherein the grid-side converter and the machine-side converter adopt the wind power converter control method of any one of the above 1 to 7.
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| CN202110309864.1A CN112968614B (en) | 2021-03-23 | 2021-03-23 | Wind power converter control method, power equipment control device and converter |
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| CN202110309864.1A CN112968614B (en) | 2021-03-23 | 2021-03-23 | Wind power converter control method, power equipment control device and converter |
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| CN113783436A (en) * | 2021-09-27 | 2021-12-10 | 广东电网有限责任公司阳江供电局 | Full-power wind power converter and control method |
| CN113992047A (en) * | 2021-10-29 | 2022-01-28 | 深圳市禾望电气股份有限公司 | Three-level circuit and control method thereof |
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| CN113783436A (en) * | 2021-09-27 | 2021-12-10 | 广东电网有限责任公司阳江供电局 | Full-power wind power converter and control method |
| CN113783436B (en) * | 2021-09-27 | 2023-10-20 | 广东电网有限责任公司阳江供电局 | Full-power wind power converter and control method |
| CN113992047A (en) * | 2021-10-29 | 2022-01-28 | 深圳市禾望电气股份有限公司 | Three-level circuit and control method thereof |
| CN113992047B (en) * | 2021-10-29 | 2024-02-20 | 深圳市禾望电气股份有限公司 | Three-level circuit and control method thereof |
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| CN112968614B (en) | 2022-05-24 |
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