CN104242345A - High-power direct drive wind power converter circuit topological structure and application thereof - Google Patents
High-power direct drive wind power converter circuit topological structure and application thereof Download PDFInfo
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- CN104242345A CN104242345A CN201410487906.0A CN201410487906A CN104242345A CN 104242345 A CN104242345 A CN 104242345A CN 201410487906 A CN201410487906 A CN 201410487906A CN 104242345 A CN104242345 A CN 104242345A
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a high-power direct drive wind power converter circuit topological structure. Outputs of two three-phase windings of a dual-winding direct drive wind generator are independent, and the output of each three-phase winding is sequentially connected with a du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase grid-side filter. The three-phase grid-side filters on two transmission branches are finally connected to a grid-connected transformer, a primary side winding of the grid-connected transformer is untied, the head end and the tail end of the primary side winding serve as input ends of the grid-connected transformer, and a secondary side winding of the grid-connected transformer provides three-phase voltage inputs for a power grid. By the application of the high-power direct drive wind power converter circuit topological structure, the capacity and the cost of the grid-side filters can be reduced, and harmonic waves of grid-connected currents are reduced; meanwhile, the switching frequency of each inverter is properly reduced, switching losses are reduced, and grid-connected efficiency is improved; output voltages are increased, currents on the primary side of the transformer are reduced, and the losses of the transformer are reduced.
Description
Technical field
The present invention relates to wind power generation field, particularly a kind of high-power directly driven wind-powered converter circuit topological structure and application thereof.
Background technology
The power of Wind turbines continues to increase, current high-power wind-driven generator many employings six-phase motor, and export two groups of three-phase voltages (misphase or not misphase), every pool-size is the half of capacity motor; In the various schemes of wind power generation, direct-drive wind power generation mode, with its superior performance, becomes the focus of Study and appliance day by day; Permanent magnetism or connected by current transformer between electric excitation direct driving wind driven generator and electrical network, wind electric converter is the indispensable energy conversion link of wind turbine generator, its Main Function is that the indefinite electric energy that the electric voltage frequency of wind-driven generator, amplitude floated is converted to frequency, amplitude stability, meet the electric energy of grid requirements, solve the crossing problem of low-voltage, by maximum power point tracking technology, wind energy can be utilized fully, improve generating efficiency further.
The generated output of current wind-driven generator has reached nearly 10MW, due in directly-driving wind power generation system, generator needs to be undertaken grid-connected by full power convertor, is subject to power electronic device and holds quantitative limitation, and the conveying capacity of single cover current transformer can not meet the Energy Transfer demand of generator; For breaking through this restriction, the parallel technology of current transformer becomes study hotspot in wind generator system, and parallel technology is when power of fan is certain, and the device for power switching that power grade can be adopted lower transmits electric current, greatly reduces production cost.
In parallel connection type converter system, serious circulation problem can be produced; Circulation flows between the current transformer of parallel connection, its existence adds loss, reduce system effectiveness, that power device heating is serious, even burn in research at present often to adopt and solve circulation problem in parallel converters system in two ways: one is eliminate circulation channel on hardware, two is adopt suitable control method to suppress circulation.Usual employing hardware mode eliminates the method for circulation for adding isolating transformer, and isolating transformer can block the circulation loop of AC, eliminates circulation, simultaneously, adopt the isolating transformer of multi-form secondary structure, specific subharmonic can be eliminated, reduce the pollution to electrical network; Owing to working under power frequency, volume, the weight of usual isolating transformer are all very large, and it can cause the increase of system cost, so be not suitable in powerful permanent magnetism or the directly driven wind-powered system of electric excitation.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of high-power directly driven wind-powered converter circuit topological structure and application thereof, can reduce capacity and the cost of net side filter, reduce the harmonic wave of grid-connected current; Suitably can reduce simultaneously and singly overlap inverter switching frequency, reduce switching loss, improve grid connection efficiency; By the raising of output voltage, reduce the electric current of transformer primary side, reduce the loss of transformer, complete the grid-connected function of wind power generation preferably.
In order to solve above technical problem, the invention provides a kind of high-power directly driven wind-powered converter circuit topological structure, comprising a double winding direct wind-driven generator, two cover three-phase windings of double winding direct wind-driven generator export separate, wherein:
Often overlap three-phase windings and export connection du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase net side filter successively, article two, the final all access grid-connected transformer of the three-phase net side filter in transmission branch, grid-connected transformer primary side winding is untied and the first and last end of former limit winding connects the output of above-mentioned two three-phase net side filters respectively as the input of grid-connected transformer, and the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network;
Rectifier is that direct current exports and every bar transmission branch is also provided with a direct current Support Capacitor between rectifier and three-phase PWM inverter, and the two ends of DC support electric capacity are connected on the positive-negative output end of rectifier respectively;
Technique effect: technique scheme can make grid-connected transformer primary side phase voltage be single twice of overlapping the phase voltage (Un) of inverter, is 2Un, thus can reduces capacity and the cost of net side filter, reduce the harmonic wave of grid-connected current; Also suitably can reduce and singly overlap inverter switching frequency, reduce switching loss, improve grid connection efficiency; By the raising of output voltage, reduce the electric current of transformer primary side, reduce the loss of transformer, complete the grid-connected function of wind power generation preferably.
The technical scheme that the present invention limits further is:
Further, the high-power directly driven wind-powered converter circuit topological structure of aforesaid one, three-phase net side filter is LC mode filter, and on its three-line, each series connection one inductance is as input, on its output, any two electric capacity of connecting respectively in three-line.
The high-power directly driven wind-powered converter circuit topological structure of aforesaid one, three-phase net side filter is LC mode filter, and on its three-line, each series connection one inductance is as input, on its output, one end of each connection one electric capacity of three-line difference, the other end of three electric capacity connects together.
The high-power directly driven wind-powered converter circuit topological structure of aforesaid one, three-phase net side filter is LCL type filter, its three-line is respectively in series with two inductance, namely respectively as input and output, any two electric capacity of connecting respectively in the three-line between input, output.
The high-power directly driven wind-powered converter circuit topological structure of aforesaid one, three-phase net side filter is LCL type filter, its three-line is respectively in series with two inductance, namely respectively as input and output, one end of each connection one electric capacity of three-line difference between input, output, the other end of three electric capacity connects together.
The high-power directly driven wind-powered converter circuit topological structure of aforesaid one, double winding direct wind-driven generator is double winding electricity excitation direct driving wind driven generator or double winding permanent magnet direct-driving aerogenerator.
The present invention have also been devised a kind of application of high-power directly driven wind-powered converter circuit topological structure, two cover three-phase windings of double winding direct wind-driven generator export three-phase alternating voltage respectively through du/dt filter input rectifier, the impact that du/dt filter prevents current transformer voltage jump from causing motor;
Three-phase alternating voltage rectification is direct voltage output by rectifier, for three-phase PWM inverter provides direct voltage after DC support electric capacity carries out filtering to VD;
According to mains supply needs, control two three-phase PWM inverters in two transmission branches simultaneously, adjust the frequency of the three-phase alternating voltage after its inversion, amplitude and phase place, the input of the access grid-connected transformer after the filtering of three-phase net side filter of the three-phase alternating voltage after inversion, now, net side phase voltage output equivalent is three level, line voltage is five level, the twice of phase voltage when grid-connected transformer primary side phase voltage is wall scroll transmission branch, the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network.
The application of aforesaid a kind of high-power directly driven wind-powered converter circuit topological structure, two three-phase PWM inverters adopt PWM ripple misphase to carry out control adjustment.
Compared with prior art:
1. net side of the present invention phase voltage output equivalent is three level, and line voltage is five level, is conducive to the harmonic wave reducing grid-connected current;
2. in the present invention, grid-connected transformer primary side phase voltage is the twice of the phase voltage of single cover inverter, thus can reduce capacity and the cost of net side filter;
3. the present invention suitably can reduce and singly overlaps inverter switching frequency, thus reduces switching loss, improves grid connection efficiency;
4. the present invention is by the raising of output voltage, reduces the electric current of transformer primary side, reduces the loss of transformer, complete the grid-connected function of wind power generation preferably;
5. the combining inverter alternating current-direct current part in current transformer is separated completely, and circulation when there is not two cover inverter alternating current-direct current part in parallel and electric current distribute unequal problem;
6. net side two in the present invention and overlap the control of inverter employing PWM ripple misphase, improve the equivalent switching frequency of output voltage further, thus reduce the harmonic wave of grid-connected current.
Accompanying drawing explanation
The high-power directly driven wind-powered converter circuit topological structure schematic diagram of the one of Fig. 1 designed by the present invention;
Fig. 2 is grid-connected transformer primary side winding phase voltage Vector modulation figure in the present invention;
Fig. 3 is the star-like connection schematic diagram of three-phase net side filter electric capacity in the present invention;
Fig. 4 is three-phase net side filter electric capacity angle-style connection schematic diagram in the present invention;
Fig. 5 is the star-like connection schematic diagram of three-phase net side filter electric capacity in the present invention;
Fig. 6 is three-phase net side filter electric capacity angle-style connection schematic diagram in the present invention.
Embodiment
In existing directly driven wind-powered current transformer, there is the following problem, as rectifier bridge input side current distortion is very serious, harmonic content is larger, and thus make generator power factor reduce, generator torque vibrates; Its DC voltage is also difficult to realize balance and controls, and the fluctuation of capacitance voltage inherently affects the overall output performance of device;
In parallel connection type converter system, hardware mode is adopted to eliminate the method for circulation for adding isolating transformer, owing to working under power frequency, volume, the weight of usual isolating transformer are all very large, it can cause the increase of system cost, so be not suitable in powerful permanent magnetism or the directly driven wind-powered system of electric excitation, the present invention is described in further detail to gather accompanying drawing below:
embodiment 1
As shown in Figure 1, present embodiments provide a kind of high-power directly driven wind-powered converter circuit topological structure, adopt the independent rectifier of two covers, often overlap rectifier meets six-phase permanent-magnet or electric excitation direct driving wind driven generator G two independent three-phase windings respectively by du/dt filter, again after DC capacitor filtering, for inverter provides direct voltage, DC inverter is three-phase alternating current by two cover inverters respectively, again by the three-phase grid transformer that former limit winding is untied, the three-phase voltage of output voltage and frequency-adjustable; Wherein, permanent magnetism or electric excitation are directly driven the three-phase alternating current that generator sends and are rectified into direct voltage by rectifier 3 and 4; 1 and 2 is du/dt filter, is connected between generator and rectifier, prevents the impact that current transformer voltage jump causes motor; The direct voltage that rectification exports, through DC capacitor C1 and C2 filtering, the inverter exported for control voltage provides direct current; 5 and 6 is three-phase PWM inverter, this part inverse of the DC into AC, by exporting after three-phase net side filter 7 and 8 filtering, according to the requirement of actual required voltage, and the alternating voltage that control inverter output frequency, amplitude and phase place are certain; 9 is grid-connected transformer, and this transformer primary side winding is untied, and winding first and last end connects the output of two-way inverter respectively, by controlling the frequency of two-way inverter output voltage, amplitude and phase place, makes grid-connected voltage meet grid requirements;
Being applied as of the present embodiment: two cover three-phase windings of double winding direct wind-driven generator export three-phase alternating voltage respectively through du/dt filter input rectifier, the impact that du/dt filter prevents current transformer voltage jump from causing motor;
Three-phase alternating voltage rectification is direct voltage output by rectifier, for three-phase PWM inverter provides direct voltage after DC support electric capacity carries out filtering to VD;
According to mains supply needs, control two three-phase PWM inverters in two transmission branches simultaneously, adjust the frequency of the three-phase alternating voltage after its inversion, amplitude and phase place, the input of the access grid-connected transformer after the filtering of three-phase net side filter of the three-phase alternating voltage after inversion, now, net side phase voltage output equivalent is three level, line voltage is five level, grid-connected transformer primary side phase voltage is the twice of the phase voltage (Un) of single cover inverter, is 2Un, sees that Vector modulation as shown in Figure 2.
embodiment 2
As shown in Figure 3, present embodiments provide a kind of high-power directly driven wind-powered converter circuit topological structure, comprise a double winding direct wind-driven generator, two cover three-phase windings of double winding direct wind-driven generator export separate, wherein:
Often overlap three-phase windings and export connection du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase net side filter successively, article two, the final all access grid-connected transformer of the three-phase net side filter in transmission branch, grid-connected transformer primary side winding is untied and the first and last end of former limit winding connects the output of above-mentioned two three-phase net side filters respectively as the input of grid-connected transformer, and the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network;
Rectifier is that direct current exports and every bar transmission branch is also provided with a direct current Support Capacitor between rectifier and three-phase PWM inverter, and the two ends of DC support electric capacity are connected on the positive-negative output end of rectifier respectively;
Three-phase net side filter is LC mode filter, and on its three-line, each series connection one inductance is as input, on its output, and any two electric capacity of connecting respectively in three-line.
embodiment 3
As shown in Figure 4, present embodiments provide a kind of high-power directly driven wind-powered converter circuit topological structure, comprise a double winding direct wind-driven generator, two cover three-phase windings of double winding direct wind-driven generator export separate, wherein:
Often overlap three-phase windings and export connection du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase net side filter successively, article two, the final all access grid-connected transformer of the three-phase net side filter in transmission branch, grid-connected transformer primary side winding is untied and the first and last end of former limit winding connects the output of above-mentioned two three-phase net side filters respectively as the input of grid-connected transformer, and the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network;
Rectifier is that direct current exports and every bar transmission branch is also provided with a direct current Support Capacitor between rectifier and three-phase PWM inverter, and the two ends of DC support electric capacity are connected on the positive-negative output end of rectifier respectively;
Three-phase net side filter is LC mode filter, and on its three-line, each series connection one inductance is as input, and on its output, one end of each connection one electric capacity of three-line difference, the other end of three electric capacity connects together.
embodiment 4
As shown in Figure 5, present embodiments provide a kind of high-power directly driven wind-powered converter circuit topological structure, comprise a double winding direct wind-driven generator, two cover three-phase windings of double winding direct wind-driven generator export separate, wherein:
Often overlap three-phase windings and export connection du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase net side filter successively, article two, the final all access grid-connected transformer of the three-phase net side filter in transmission branch, grid-connected transformer primary side winding is untied and the first and last end of former limit winding connects the output of above-mentioned two three-phase net side filters respectively as the input of grid-connected transformer, and the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network;
Rectifier is that direct current exports and every bar transmission branch is also provided with a direct current Support Capacitor between rectifier and three-phase PWM inverter, and the two ends of DC support electric capacity are connected on the positive-negative output end of rectifier respectively;
Three-phase net side filter is LCL type filter, its three-line is respectively in series with two inductance, namely respectively as input and output, and any two electric capacity of connecting respectively in the three-line between input, output.
embodiment 5
As shown in Figure 6, present embodiments provide a kind of high-power directly driven wind-powered converter circuit topological structure, comprise a double winding direct wind-driven generator, two cover three-phase windings of double winding direct wind-driven generator export separate, wherein:
Often overlap three-phase windings and export connection du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase net side filter successively, article two, the final all access grid-connected transformer of the three-phase net side filter in transmission branch, grid-connected transformer primary side winding is untied and the first and last end of former limit winding connects the output of above-mentioned two three-phase net side filters respectively as the input of grid-connected transformer, and the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network;
Rectifier is that direct current exports and every bar transmission branch is also provided with a direct current Support Capacitor between rectifier and three-phase PWM inverter, and the two ends of DC support electric capacity are connected on the positive-negative output end of rectifier respectively;
Three-phase net side filter is LCL type filter, its three-line is respectively in series with two inductance, namely respectively as input and output, one end of each connection one electric capacity of three-line difference between input, output, the other end of three electric capacity connects together.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (8)
1. a high-power directly driven wind-powered converter circuit topological structure, comprises a double winding direct wind-driven generator, it is characterized in that, two cover three-phase windings of described double winding direct wind-driven generator export separate, wherein:
Often overlap three-phase windings and export connection du/dt filter, a rectifier, a three-phase PWM inverter and a three-phase net side filter successively, article two, the final all access grid-connected transformer of the three-phase net side filter in transmission branch, described grid-connected transformer primary side winding is untied and the first and last end of former limit winding connects the output of above-mentioned two three-phase net side filters respectively as the input of grid-connected transformer, and the secondary limit winding of described grid-connected transformer provides three-phase voltage to input for electrical network;
Described rectifier is that direct current exports and every bar transmission branch is also provided with a direct current Support Capacitor between rectifier and three-phase PWM inverter, and the two ends of described DC support electric capacity are connected on the positive-negative output end of rectifier respectively.
2. high-power directly driven wind-powered converter circuit topological structure according to claim 1, it is characterized in that, described three-phase net side filter is LC mode filter, and on its three-line, each series connection one inductance is as input, on its output, any two electric capacity of connecting respectively in three-line.
3. high-power directly driven wind-powered converter circuit topological structure according to claim 1, it is characterized in that, described three-phase net side filter is LC mode filter, on its three-line, each series connection one inductance is as input, on its output, one end of each connection one electric capacity of three-line difference, the other end of three electric capacity connects together.
4. high-power directly driven wind-powered converter circuit topological structure according to claim 1, it is characterized in that, described three-phase net side filter is LCL type filter, its three-line is respectively in series with two inductance, namely respectively as input and output, any two electric capacity of connecting respectively in the three-line between input, output.
5. high-power directly driven wind-powered converter circuit topological structure according to claim 1, it is characterized in that, described three-phase net side filter is LCL type filter, its three-line is respectively in series with two inductance, namely respectively as input and output, one end of each connection one electric capacity of three-line difference between input, output, the other end of three electric capacity connects together.
6. according to the high-power directly driven wind-powered converter circuit topological structure in claim 1 to 5 described in any one claim, it is characterized in that, described double winding direct wind-driven generator is double winding electricity excitation direct driving wind driven generator or double winding permanent magnet direct-driving aerogenerator.
7. according to the application of the high-power directly driven wind-powered converter circuit topological structure in claim 1 to 6 described in any one claim, it is characterized in that, two cover three-phase windings of double winding direct wind-driven generator export three-phase alternating voltage respectively through du/dt filter input rectifier, the impact that du/dt filter prevents current transformer voltage jump from causing motor;
Three-phase alternating voltage rectification is direct voltage output by rectifier, for three-phase PWM inverter provides direct voltage after DC support electric capacity carries out filtering to VD;
According to mains supply needs, control two three-phase PWM inverters in two transmission branches simultaneously, adjust the frequency of the three-phase alternating voltage after its inversion, amplitude and phase place, the input of the access grid-connected transformer after the filtering of three-phase net side filter of the three-phase alternating voltage after inversion, now, net side phase voltage output equivalent is three level, line voltage is five level, the twice of phase voltage when grid-connected transformer primary side phase voltage is wall scroll transmission branch, the secondary limit winding of grid-connected transformer provides three-phase voltage to input for electrical network.
8. the application of high-power directly driven wind-powered converter circuit topological structure according to claim 7, is characterized in that, two three-phase PWM inverters adopt PWM ripple misphase to carry out control adjustment.
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| CN107947242A (en) * | 2017-12-22 | 2018-04-20 | 北京金风科创风电设备有限公司 | Power generation and transmission system of wind generating set and wind generating set |
| CN108732441A (en) * | 2018-05-07 | 2018-11-02 | 天津瑞能电气有限公司 | A kind of aging testing system based on current transformer product |
| CN112134469A (en) * | 2020-09-27 | 2020-12-25 | 上海绿巨人爱爵能源科技有限公司 | Power supply device suitable for high-power and ultra-high-power water electrolysis hydrogen production |
| CN114123314A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Single wind wheel double-winding motor independent grid-connected system |
| CN114123305A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system |
| CN114123308A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system |
| CN114123304A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation |
| CN114123301A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Series double-wind wheel single-motor direct-current series-parallel switching unified grid-connected system |
| CN112134469B (en) * | 2020-09-27 | 2024-04-26 | 上海巨人能源科技有限公司 | Power supply device suitable for high-power and ultra-high-power water electrolysis hydrogen production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112134469B (en) * | 2020-09-27 | 2024-04-26 | 上海巨人能源科技有限公司 | Power supply device suitable for high-power and ultra-high-power water electrolysis hydrogen production |
| CN114123314A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Single wind wheel double-winding motor independent grid-connected system |
| CN114123305A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system |
| CN114123308A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Single-wind-wheel double-winding motor direct-current series-parallel switching unified grid-connected system |
| CN114123304A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Four-input single-output direct current series-parallel connection grid-connected switching system for wind power generation |
| CN114123301A (en) * | 2021-10-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Series double-wind wheel single-motor direct-current series-parallel switching unified grid-connected system |
| CN114123301B (en) * | 2021-10-26 | 2023-09-29 | 中国华能集团清洁能源技术研究院有限公司 | Direct current series-parallel switching unified grid-connected system with serial double wind wheels and single motor |
| CN114123304B (en) * | 2021-10-26 | 2023-10-20 | 中国华能集团清洁能源技术研究院有限公司 | Four-input single-output direct current series-parallel grid-connected switching system for wind power generation |
| CN114123308B (en) * | 2021-10-26 | 2024-01-09 | 中国华能集团清洁能源技术研究院有限公司 | DC series-parallel switching unified grid-connected system of single wind wheel double winding motor |
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Application publication date: 20141224 |