CN101710815A - System and method for controlling low voltage ride through of grid side converter of double-feed induction wind driven generator in power grid three-phase short-circuit failure - Google Patents
System and method for controlling low voltage ride through of grid side converter of double-feed induction wind driven generator in power grid three-phase short-circuit failure Download PDFInfo
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Abstract
The invention relates to a system and a method for controlling low voltage ride through of a grid side converter of a double-feed induction wind driven generator in power grid three-phase short-circuit failure. The system comprises a double-feed induction wind driven generator and a rotor excitation converter which consists of a rotor side converter and a grid side converter, a voltage Hall sensor is arranged on a synchronization common coupling joint, and a digital signal processor is connected with the rotor excitation converter and the voltage Hall sensor. The method comprises the steps of: detecting the percentage of power grid drop; and multiplying the percentage by three-phase modulating voltage of the grid side converter when a power grid is in failure to be used as a new modulating voltage for keeping potential difference of the power grid voltage and the fundamental voltage of the input end of the grid side converter basically unchangeable, thereby stabilizing the voltage of a direct current bus. A hardware protection circuit is additionally arranged in the method, and the system has simple structure. When the power gird is in three-phase short-circuit failure, the voltage fluctuation of the direct current bus and the input current fluctuation of the grid side converter are effectively inhibited; and when a generator exceeds the synchronous operation, rotor electric energy is rapidly fed to the power grid, thereby protecting safety operation of the rotor excitation converter of the double-feed induction wind driven generator.
Description
Technical field
Stablize double-fed induction wind driven generator rotor-exciting converter DC bus-bar voltage when the present invention relates to a kind of electrical network three phase short circuit fault, reduce the method that grid side converter exchanges the input current fluctuation, belong to the double-fed induction wind driven generator low-voltage and pass through control technology.
Background technology
Along with improving constantly of double-fed wind generating single-machine capacity, the various running statuses of blower fan obtain common concern and broad research to the influence of grid stability during electric network fault.Various countries Utilities Electric Co. has proposed the specification requirement that double-fed wind generating is incorporated into the power networks one after another, wherein low-voltage is passed through (Low Voltage Ride Though, LVRT) be considered to ultimate challenge on the double-fed wind generating design control technology, be directly connected to applying of wind power generation.
At present, the research of double-fed wind power generator low-voltage crossing technology focuses mostly in the rotor-side converter, and it is very few that the low-voltage of grid side converter is passed through Research on Control.During short circuit malfunction, if it is constant to keep the control of rotor-side converter excitation, rotor power causes DC bus-bar voltage fluctuation by a relatively large margin to occur fluctuation.And fluctuating widely of DC bus-bar voltage can impact to dc-link capacitance, and will directly influence the not control effect of off-grid operation of generator, generator recovers normal excitation control again when also being unfavorable for failure removal simultaneously, therefore must take effective LVRT measure to keep the stable of DC bus-bar voltage for grid side converter.
Summary of the invention
When the object of the present invention is to provide a kind of electrical network three-phase shortcircuit, the grid side converter of double-feed induction wind driven generator low voltage traversing control method.This control method need not to increase hardware protection circuit, and system configuration is simple.
For achieving the above object, the present invention adopts following technical proposals:
The grid side converter of double-feed induction wind driven generator low-voltage is passed through control system during a kind of electrical network three phase short circuit fault, comprise double-fed induction wind driven generator and rotor-exciting converter, the rotor-exciting converter is made of rotor-side converter and grid side converter two parts, it is characterized in that the public tie point P of double-fed induction wind driven generator threephase stator output and electrical network
CCLast installation voltage hall sensor, connect described rotor-exciting converter and voltage hall sensor by a digital signal processor, described digital signal processor carries out judgement of electrical network three phase short circuit fault and line voltage landing percentage calculation according to the voltage signal of voltage hall sensor collection, and according to this line voltage landing percentage change grid side converter modulated voltage signal, control grid side converter.
The grid side converter of double-feed induction wind driven generator low-voltage is passed through in the control hardware device during above-mentioned electrical network three phase short circuit fault, and described digital signal processor adopts the DSP2407 or the DSP2812 of TI company.Grid side converter constitutes three-phase bridge circuit by the IGBT power tube and realizes that voltage sensor adopts the voltage hall sensor of LEM.
Digital signal processor carries out the judgement of electrical network three phase short circuit fault according to the voltage signal of voltage hall sensor collection, if judge electrical network generation three phase short circuit fault, the current signal that digital signal processor is gathered according to voltage hall sensor calculates line voltage landing percentage, and according to this line voltage landing percentage change modulated voltage signal, and then control grid side converter.The generation step that it is characterized by the grid side converter modulated voltage signal is as follows:
1. utilize above-mentioned voltage hall sensor to detect three phase network voltage V
a, V
b, V
c, when detecting the electrical network three phase short circuit fault, carry out following steps;
2. utilize the detected value of step in 1., the voltage landing percentage p (ratio of line voltage after the landing and line voltage normal value) when obtaining the electrical network three phase short circuit fault and taking place;
When 3. the electrical network three phase short circuit fault took place, the p in 2. controlled as current grid side converter modulated voltage signal with the product that preceding grid side converter modulated voltage signal takes place the electrical network three phase short circuit fault with step;
When 4. line voltage recovers normal value, current modulated voltage signal switched to and 1 multiply each other, promptly when fault the basic superior 1/p of modulated voltage signal as line voltage grid side converter modulated voltage signal just often;
5. for reaching better control effect, can also further adjust modulated voltage signal, the p when the electrical network three phase short circuit fault is taken place take advantage of again one less than 1 greater than 0 pre-determined factor; When line voltage recovers normal value, with the modulated voltage signal of state 1 take advantage of one greater than 1 less than 2 pre-determined factor '.
The present invention compared with prior art; have following conspicuous substantive distinguishing features and remarkable advantage: this method need not to increase hardware protection circuit; system configuration is simple; when electrical network generation three phase short circuit fault; effectively suppress the DC bus-bar voltage fluctuation; the fluctuation of grid side converter input current feeds electric energy into electrical network with rotor fast when the supersynchronous operation of generator, the safe operation of protection double fed induction generators rotor-exciting converter.
Description of drawings
The grid side converter of double-feed induction wind driven generator low-voltage was passed through the control system structure chart when Fig. 1 was the electrical network three phase short circuit fault;
Fig. 2 is R phase phase voltage and the phase current experimental waveform that subsynchronous running status voltage drop was fallen 40% o'clock;
Fig. 3 is DC bus-bar voltage and the R phase phase current experimental waveform that subsynchronous running status voltage drop was fallen 40% o'clock;
Fig. 4 is R phase phase voltage and the phase current experimental waveform that supersynchronous running status voltage drop was fallen 40% o'clock;
Fig. 5 is DC bus-bar voltage and the R phase phase current experimental waveform that supersynchronous running status voltage drop was fallen 40% o'clock;
Fig. 6 is that R phase phase voltage and phase current experimental waveform are fallen in subsynchronous running status voltage drop at 40% o'clock when adopting the grid side converter low voltage traversing control method;
Fig. 7 is that DC bus-bar voltage and R phase phase current experimental waveform are fallen in subsynchronous running status voltage drop at 40% o'clock when adopting the grid side converter low voltage traversing control method;
Fig. 8 is that R phase phase voltage and phase current experimental waveform are fallen in supersynchronous running status voltage drop at 40% o'clock when adopting the grid side converter low voltage traversing control method;
Fig. 9 is that DC bus-bar voltage and R phase phase current experimental waveform are fallen in supersynchronous running status voltage drop at 40% o'clock when adopting the grid side converter low voltage traversing control method.
Embodiment
Below in conjunction with accompanying drawing embodiment is further described.Referring to Fig. 1, the grid side converter of double-feed induction wind driven generator low-voltage is passed through control system during the electrical network three phase short circuit fault, comprise double-fed induction wind driven generator 1 and rotor-exciting converter 2, wherein rotor-exciting converter 2 comprises rotor-side converter 3 and grid side converter 4 two parts again, the public tie point P of double-fed induction wind driven generator 1 threephase stator output and electrical network
CCThe voltage hall sensor 5 of last installation, connect described rotor-exciting converter 2 and voltage hall sensor 5 by a digital signal processor 6, the voltage signal that digital signal processor 6 is gathered according to voltage hall sensor 5 carries out judgement of electrical network three phase short circuit fault and line voltage landing percentage calculation, and by the line voltage landing percentage change modulated voltage signal that calculates, control grid side converter 4.Described digital signal processor 6 adopts the DSP2407 or the DSP2812 of TI company, and it is by modulation algorithm module output modulation signal.Grid side converter 4 constitutes three-phase bridge circuit by the IGBT power tube to be realized.
Grid side converter of double-feed induction wind driven generator low voltage traversing control method during the electrical network three phase short circuit fault, the voltage signal that digital signal processor 6 is gathered according to voltage hall sensor 5 carries out the electrical network three phase short circuit fault and judges, if judge electrical network generation three phase short circuit fault, the current signal that digital signal processor 6 is gathered according to voltage hall sensor 5 calculates line voltage landing percentage, and changes grid side converter modulated voltage signal control grid side converter 4 by the line voltage landing percentage that calculates.The generation step of described grid side converter 4 modulated voltage signals is as follows:
1. utilize above-mentioned voltage hall sensor 5 to detect three phase network voltage V
a, V
b, V
c, when detecting the electrical network three phase short circuit fault, carry out following steps;
2. the detected value in utilizing 1., the voltage landing percentage p (ratio of line voltage after the landing and line voltage normal value) when obtaining the generation of electrical network three phase short circuit fault;
When 3. the electrical network three phase short circuit fault takes place, above-mentioned p in is 2. controlled as current modulated voltage signal with the product that preceding grid side converter grid side converter modulated voltage signal takes place the electrical network three phase short circuit fault;
When 4. line voltage recovers normal value, current modulated voltage signal switched to and 1 multiply each other, promptly when fault the basic superior 1/p of modulated voltage signal as line voltage modulated voltage signal just often;
5. for reaching better control effect, can also further adjust modulated voltage signal, the p when the electrical network three phase short circuit fault is taken place take advantage of again one less than 1 greater than 0 pre-determined factor; When line voltage recovers normal value, with the modulated voltage signal of state 1 take advantage of one greater than 1 less than 2 pre-determined factor '.
Grid side converter of double-feed induction wind driven generator low voltage traversing control method principle is summarized as follows during the electrical network three phase short circuit fault:
When (1) electric network fault took place, generator was in subsynchronous running status
During the subsynchronous operation of double-fed induction wind driven generator, the generator amature exciting current is provided by the rotor-exciting current transformer, power flow direction as shown in Figure 1, the rotor-side converter is in inverter mode, grid side converter is in stable rectification state (establish it and be state 1), R phase current I
RFlow to R ' point by the A point.When the electrical network three phase short circuit fault takes place, the A point voltage reduces suddenly among Fig. 1, because DC bus-bar voltage and modulated voltage signal can not suddenly change, R ' point voltage can not suddenly change, cause A point and R ' some point-to-point transmission voltage difference to reduce even oppositely, electrical network flows to the electric current I of grid side converter
RReduce even oppositely; This moment, the rotor-side converter still continued to cause DC bus-bar voltage to descend to the rotor power supply.Voltage drop is fallen 40% o'clock R phase phase voltage and phase current experimental waveform as shown in Figure 2, and DC bus-bar voltage and R phase phase current experimental waveform are as shown in Figure 3.Moment of line voltage landing as seen from the figure, DC bus-bar voltage begins to descend, and be lower than set point immediately, for keeping the constant of DC bus-bar voltage, grid side converter is regulated according to current line voltage, and DC bus-bar voltage progressively goes back up to set point, and grid side converter finally reaches the stylish rectification state of electric network fault (establish it and be state 2) simultaneously, this moment, the modulated voltage signal under the state 2 was different from the modulated voltage signal of state 1 because line voltage is lower than normal value.
Recover the moment of normal value when line voltage, the A point voltage gos up suddenly to normal electrical network magnitude of voltage among Fig. 1, but DC bus-bar voltage and modulated voltage signal can not suddenly change, the value during hold mode 2 still, therefore R ' point voltage also can not suddenly change at this moment, voltage difference increases suddenly between A point and R ' two, flows to the electric current I of grid side converter from electrical network
RIncrease suddenly, cause energy moment increase, and the rotor-side converter keeps still original electric current to power to rotor, also is that fan-out capability does not increase from the electrical network input, input causes the dc-link capacitance charging with the energy difference of output, and DC bus-bar voltage raises immediately.
When (2) electric network fault took place, generator was in supersynchronous running status
During the supersynchronous operation of double-fed induction wind driven generator, rotor is presented energy by the rotor-exciting current transformer to electrical network, P among power flow direction and Fig. 1
cOn the contrary, grid side converter is in stable inverter mode (establish it and be state 3), R phase current I
RFlow to the A point by R '.When the electrical network three phase short circuit fault takes place, the A point voltage reduces suddenly among Fig. 1, because DC bus-bar voltage and modulated voltage signal can not suddenly change, R ' point voltage can not suddenly change, thereby voltage difference increases suddenly between A point and R ' two, and the electric current that grid side converter is presented to electrical network increases suddenly, causes DC bus-bar voltage to descend, voltage drop is fallen 40% o'clock R phase phase voltage and phase current experimental waveform as shown in Figure 4, and DC bus-bar voltage and R phase phase current experimental waveform are as shown in Figure 5.Moment of line voltage landing as seen from the figure, DC bus-bar voltage begins to descend, be lower than set point immediately, for keeping the constant of DC bus-bar voltage, grid side converter is regulated according to current line voltage, and DC bus-bar voltage progressively goes back up to set point, and grid side converter finally reaches the stylish inverter mode of electric network fault (establish it and be state 4) simultaneously, this moment, the modulated voltage signal under the state 4 was different from the modulated voltage signal of state 3 because line voltage is lower than normal value.
Recover the moment of normal value when line voltage, the A point voltage gos up suddenly to normal line voltage among Fig. 1, but DC bus-bar voltage and modulated voltage signal can not suddenly change, the value during hold mode 4 still, therefore R ' point voltage also can not suddenly change at this moment, voltage difference reduces suddenly between A point and R ' two, grid side converter can not normally be presented energy to electrical network, grid side converter is limited to electrical network output electric energy, but cause dc-link capacitance charging because the control of rotor-side converter excitation does not change, and the rotor-side converter is still presented energy to dc bus this moment, voltage raises, cause DC bus-bar voltage to exceed permissible value when serious, cause system's catastrophe failure.
(3) grid side converter of double-feed induction wind driven generator low voltage traversing control method
According to above-mentioned analysis, when the subsynchronous and supersynchronous operation of double-fed induction wind driven generator, the fluctuation of the DC bus-bar voltage of rotor-exciting converter all is because line voltage landing and when returning to normal value, R ' some variation with A point two point voltage differences causes, for the stable DC busbar voltage, reduce the current fluctuation of grid side converter, prevent when supersynchronous that DC bus-bar voltage from exceeding permissible value, this specification proposes the control method that a kind of grid side converter low-voltage is passed through.
Detection of grid three-phase voltage instantaneous value also calculates its effective value, establish line voltage just often R phase voltage effective value be U
R, when the electrical network three phase short circuit fault takes place, be U
R', obtain U
R' with U
RRatio be voltage landing percentage p (greater than 0 less than 1).The subsynchronous operation grid side converter of generator is in the rectification operating state, R phase current I among Fig. 1
RFlow to R ' point by the A point, when the electrical network three phase short circuit fault took place, the A point voltage reduced at once, and A point and R ' point voltage difference reduce, and the electric current that electrical network flows to dc bus reduces, and caused DC bus-bar voltage to descend.To flow to the size of current of dc bus constant substantially in order to keep original electrical network, needs force R ' point voltage to reduce at this moment immediately the present invention when electric network fault voltage landed percentage p and the three-phase modulations voltage signal v that calculates according to the line voltage normal value
R, v
S, v
TMultiply each other, obtain the electrical network three phase short circuit fault stylish three-phase modulations voltage signal v takes place
R', v
S', v
T', force R ' some current potential and A point current potential to descend in proportion, the electric current that electrical network flows to dc bus remains unchanged substantially, the DC bus-bar voltage kept stable.When line voltage recovered normal value, the A point voltage recovered the normal voltage value immediately, because the A point voltage is uprushed, A point and R ' point voltage difference increase suddenly, and the electric current that electrical network flows to grid side converter increases, and caused DC bus-bar voltage to raise.In like manner, remain unchanged substantially, need to force immediately at this moment R ' point voltage to increase, current modulated voltage signal v for keeping original power network current
R, v
S, v
TSwitch to and 1 multiply each other, promptly the basic superior 1/p when fault is as new modulated voltage signal.
The supersynchronous operation grid side converter of generator is in the inversion operating state, R phase current I among Fig. 1
RFlow to the A point by R ', when the electrical network three phase short circuit fault took place, A point voltage wink fell, and A point and R ' point voltage difference are uprushed thereupon, and dc bus flows to the electric current of electrical network and also uprushes, and caused DC bus-bar voltage to raise.Constant substantially for keeping original size of current that flows to electrical network, need force R ' point voltage to reduce at this moment immediately, this moment with p respectively with the three-phase modulations voltage signal v that calculates according to the line voltage normal value
R, v
S, v
TMultiply each other, obtain the electrical network three phase short circuit fault stylish three-phase modulations voltage signal v takes place
R', v
S', v
T'.Force R ' some current potential and A point current potential to descend in proportion, the electric current that electrical network flows to dc bus remains unchanged substantially, and DC bus-bar voltage is kept stable also.When line voltage recovers normal value, the A point voltage recovers the normal voltage value immediately, voltage when the A point voltage of this moment is higher than electric network fault, because the A point voltage is uprushed, A point and R ' point voltage difference reduce suddenly, the electric current that flows to also reduces, and causes the grid side converter can not be normally to the electrical network feed, and DC bus-bar voltage raises.In like manner, constant substantially for keeping original electric current that flows to electrical network, need force immediately at this moment R ' point voltage to increase, with current modulated voltage signal v
R, v
S, v
TSwitch to and 1 multiply each other, promptly the basic superior 1/p when fault is equivalent to R ' point voltage and enlarges 1/p doubly, thereby electric energy is fed to electrical network fast as new modulated voltage signal, has avoided the dc-link capacitance charging, keeps DC bus-bar voltage steady substantially.
Fig. 6 and Fig. 7 are when adopting the grid side converter low voltage traversing control method, R phase phase voltage, phase current and DC bus-bar voltage experimental waveform are fallen in subsynchronous running status voltage drop at 40% o'clock, with Fig. 2,3 contrasts as can be seen when adopting the grid side converter low voltage traversing control method R phase current and DC bus-bar voltage fluctuation obviously reduce mutually.Fig. 8 and Fig. 9 are when adopting the grid side converter low voltage traversing control method, R phase phase voltage, phase current and DC bus-bar voltage experimental waveform are fallen in supersynchronous running status voltage drop at 40% o'clock, with Fig. 4,5 contrasts as can be seen when adopting the grid side converter low voltage traversing control method R phase current and DC bus-bar voltage fluctuation obviously reduce mutually.
Claims (3)
1. the grid side converter of double-feed induction wind driven generator low-voltage is passed through control system during an electrical network three phase short circuit fault, comprise double-fed induction wind driven generator (1) and rotor-exciting converter (2), rotor-exciting converter (2) is made of rotor-side converter (3) and grid side converter (4) two parts, it is characterized in that the public tie point P of double-fed induction wind driven generator (1) threephase stator output and electrical network
CCOn voltage hall sensor (5) is housed, connect described rotor-exciting converter (2) and voltage hall sensor (5) by a digital signal processor (6), the voltage signal that described digital signal processor (6) is gathered according to voltage hall sensor (5) carries out judgement of electrical network three phase short circuit fault and line voltage landing percentage calculation, and according to this line voltage landing percentage change grid side converter modulated voltage signal, control grid side converter (4).
2. grid side converter of double-feed induction wind driven generator low voltage traversing control method during an electrical network three phase short circuit fault, the grid side converter of double-feed induction wind driven generator low-voltage is passed through control system and is detected and control when adopting electrical network three phase short circuit fault according to claim 1, it is characterized in that the voltage signal that digital signal processor (6) is gathered according to voltage hall sensor (5) carries out the judgement of electrical network three phase short circuit fault, if judge electrical network generation three phase short circuit fault, the voltage signal that digital signal processor (6) is gathered according to voltage hall sensor (5) calculates line voltage landing percentage, generates grid side converter (4) modulated voltage signal control grid side converter (4).
3. grid side converter of double-feed induction wind driven generator low voltage traversing control method during according to the described electrical network three phase short circuit fault of right 2, the step that it is characterized by described generation grid side converter (4) modulated voltage signal is as follows:
1. utilize above-mentioned voltage hall sensor (5) to detect three phase network voltage V
a, V
b, V
c, when detecting the electrical network three phase short circuit fault, carry out following steps;
2. utilize the detected value of step in 1., the voltage landing percentage p when obtaining the electrical network three phase short circuit fault and taking place, the i.e. line voltage after the landing and the ratio of line voltage normal value;
When 3. the electrical network three phase short circuit fault took place, the p in 2. controlled as current grid side converter modulated voltage signal with the product that preceding grid side converter modulated voltage signal takes place the electrical network three phase short circuit fault with step;
When 4. line voltage recovers normal value, current modulated voltage signal switched to and 1 multiply each other, promptly when fault the basic superior 1/p of modulated voltage signal as line voltage grid side converter modulated voltage signal just often;
5. for reaching better control effect, can also further adjust the grid side converter modulated voltage signal, the p when the electrical network three phase short circuit fault is taken place take advantage of again one less than 1 greater than 0 pre-determined factor; When line voltage recovers normal value, with the modulated voltage signal of state 1 take advantage of one greater than 1 less than 2 pre-determined factor.
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|---|---|---|---|
| CN200910199582XA CN101710815B (en) | 2009-11-26 | 2009-11-26 | System and method for controlling low voltage ride through of grid side converter of double-feed induction wind driven generator in power grid three-phase short-circuit failure |
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|---|---|---|---|
| CN200910199582XA CN101710815B (en) | 2009-11-26 | 2009-11-26 | System and method for controlling low voltage ride through of grid side converter of double-feed induction wind driven generator in power grid three-phase short-circuit failure |
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Cited By (7)
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| CN101968032A (en) * | 2010-09-07 | 2011-02-09 | 国电联合动力技术有限公司 | Low voltage ride-through monitoring system for doubly-fed wind generator |
| CN102053211A (en) * | 2010-12-08 | 2011-05-11 | 沈阳工业大学 | Fault diagnosis method of wind power generation system converter device |
| CN102055207A (en) * | 2010-12-16 | 2011-05-11 | 南京飓能电控自动化设备制造有限公司 | Intelligent power control unit for low voltage ride through and application thereof |
| CN102064559A (en) * | 2010-11-15 | 2011-05-18 | 乌云翔 | Wind driven generator converter featuring high voltage redundency |
| CN102539988A (en) * | 2010-12-23 | 2012-07-04 | 上海联盛汽车电子有限公司 | Diagnosis methods for phase line faults of electric power steering system |
| CN113890084A (en) * | 2021-09-06 | 2022-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Abnormity control method, device and control system of tandem type double-wind-wheel power generation system |
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| CN101299540B (en) * | 2007-04-30 | 2011-04-27 | 国网南京自动化研究院 | Apparatus for implementing low voltage cross-over of wind generator set |
| CN101136582B (en) * | 2007-09-03 | 2010-06-09 | 中国科学院电工研究所 | Control method of DC side-discharging circuit of full power convertor |
| CN101499664A (en) * | 2008-02-03 | 2009-08-05 | 北京能高自动化技术有限公司 | Low voltage traversing control method for wind power generation set grid-connection current transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101968032A (en) * | 2010-09-07 | 2011-02-09 | 国电联合动力技术有限公司 | Low voltage ride-through monitoring system for doubly-fed wind generator |
| CN102064559A (en) * | 2010-11-15 | 2011-05-18 | 乌云翔 | Wind driven generator converter featuring high voltage redundency |
| CN102053211A (en) * | 2010-12-08 | 2011-05-11 | 沈阳工业大学 | Fault diagnosis method of wind power generation system converter device |
| CN102055207A (en) * | 2010-12-16 | 2011-05-11 | 南京飓能电控自动化设备制造有限公司 | Intelligent power control unit for low voltage ride through and application thereof |
| CN102055207B (en) * | 2010-12-16 | 2012-08-01 | 南京飓能电控自动化设备制造有限公司 | Intelligent power control unit for low voltage ride through and application thereof |
| CN102539988A (en) * | 2010-12-23 | 2012-07-04 | 上海联盛汽车电子有限公司 | Diagnosis methods for phase line faults of electric power steering system |
| CN102539988B (en) * | 2010-12-23 | 2014-05-07 | 联创汽车电子有限公司 | Diagnosis methods for phase line faults of electric power steering system |
| CN113890084A (en) * | 2021-09-06 | 2022-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Abnormity control method, device and control system of tandem type double-wind-wheel power generation system |
| CN113890084B (en) * | 2021-09-06 | 2023-09-29 | 中国华能集团清洁能源技术研究院有限公司 | Abnormal control method, device and control system of tandem double wind wheel power generation system |
| CN116154845A (en) * | 2022-12-08 | 2023-05-23 | 中国石油大学(华东) | Control method of H-bridge serial-parallel switching type forced excitation converter based on DAB |
| CN116154845B (en) * | 2022-12-08 | 2023-11-21 | 中国石油大学(华东) | Control method of H-bridge serial-parallel switching type forced excitation converter based on DAB |
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