电力勘测设计
電力勘測設計
전력감측설계
Electric Power Survey & Design
2015年
5期
75-80
,共6页
双馈风电机组%控制策略%低电压穿越策略%故障特性
雙饋風電機組%控製策略%低電壓穿越策略%故障特性
쌍궤풍전궤조%공제책략%저전압천월책략%고장특성
doubly fed wind power generator%control strategy%low voltage ride through strategy%the fault characteristic
在机组故障期间转子Crowbar投入不能为电网提供无功支持同时会从电网吸收一定无功从而导致电网运行情况进一步恶化，针对Crowbar保护的弊端提出一种低电压穿越方法，利用DC-Chopper代替Crowbar，同时在故障情况下通过对转子侧变流器进行解耦控制，控制定子侧给电网提供一定无功支持，能更好的实现机组故障穿越。基于此策略在PSCAD平台上搭建了的双馈风电场仿真模型，对比验证了风电场具有低电压穿越能力及控制策略的优越性。在此基础上，分别仿真分析不同故障类型下双馈风电场的故障特性。研究结果表明传统转子Crowbar电路的投入是机组故障电流频率为非工频的原因，而采用其他非转子Crowbar电路的机组故障电流频率为工频；风电场联络线发生任何类型的不对称接地故障，风电场侧都会表现出弱电源特性，单相接地故障表现出的弱电源特性更为明显。这对故障选相元件将会受到严重影响。研究成果具有一定的实际价值和意义。
在機組故障期間轉子Crowbar投入不能為電網提供無功支持同時會從電網吸收一定無功從而導緻電網運行情況進一步噁化，針對Crowbar保護的弊耑提齣一種低電壓穿越方法，利用DC-Chopper代替Crowbar，同時在故障情況下通過對轉子側變流器進行解耦控製，控製定子側給電網提供一定無功支持，能更好的實現機組故障穿越。基于此策略在PSCAD平檯上搭建瞭的雙饋風電場倣真模型，對比驗證瞭風電場具有低電壓穿越能力及控製策略的優越性。在此基礎上，分彆倣真分析不同故障類型下雙饋風電場的故障特性。研究結果錶明傳統轉子Crowbar電路的投入是機組故障電流頻率為非工頻的原因，而採用其他非轉子Crowbar電路的機組故障電流頻率為工頻；風電場聯絡線髮生任何類型的不對稱接地故障，風電場側都會錶現齣弱電源特性，單相接地故障錶現齣的弱電源特性更為明顯。這對故障選相元件將會受到嚴重影響。研究成果具有一定的實際價值和意義。
재궤조고장기간전자Crowbar투입불능위전망제공무공지지동시회종전망흡수일정무공종이도치전망운행정황진일보악화，침대Crowbar보호적폐단제출일충저전압천월방법，이용DC-Chopper대체Crowbar，동시재고장정황하통과대전자측변류기진행해우공제，공제정자측급전망제공일정무공지지，능경호적실현궤조고장천월。기우차책략재PSCAD평태상탑건료적쌍궤풍전장방진모형，대비험증료풍전장구유저전압천월능력급공제책략적우월성。재차기출상，분별방진분석불동고장류형하쌍궤풍전장적고장특성。연구결과표명전통전자Crowbar전로적투입시궤조고장전류빈솔위비공빈적원인，이채용기타비전자Crowbar전로적궤조고장전류빈솔위공빈；풍전장련락선발생임하류형적불대칭접지고장，풍전장측도회표현출약전원특성，단상접지고장표현출적약전원특성경위명현。저대고장선상원건장회수도엄중영향。연구성과구유일정적실제개치화의의。
The doubly-fed induction generator (DFIG) can't provide reactive power instead of absorbing it from the system for excitation which can bring about further deterioration. Aiming at the disadvantages of Crowbar protection presents a low voltage ride through the method, using DC-Chopper instead of Crowbar, at the same time, in case of failure by the decoupling control of rotor side converter, grid side control of stator to provide reactive power support, can better realize the unit fault crossing. Doubly fed inductiongenerator wind farm simulation model built in this strategy based on the PSCAD platform, verify the wind farm has the superiority of low voltage ride through capability and control strategy. On this basis, respectively, simulation analysis of fault characteristics of DFIG wind farm under different fault types. The results show that the traditional rotor Crowbar circuit input is fault current frequency for reasons of non power frequency, and the use of other non fault current frequency rotor Crowbar circuit for frequency; wind farm tie line of any type of asymmetric grounding fault, the wind farm side will show a weak source feature, single phase grounding fault performance a weak source feature is more obvious. The fault phase selection components will be seriously affected. Research findings has a certain practical value and significance of the research.
