双馈风机同步转速工况下变流器运行分析  

Analysis of Converter Operation Under Synchronous Speed Condition of Doubly-fed Wind Turbine Generator System

作　　者：陈志强 于彬 CHEN Zhiqiang;YU Bin(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;NARI Technology Company Limited,Nanjing 211106,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),南京211106 [2]国电南瑞科技股份有限公司,南京211106

出　　处：《吉林电力》2021年第5期50-53,共4页Jilin Electric Power

摘　　要：以华北某风电场双馈机组在同步转速下变流器机侧绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)频繁失效为案例,通过仿真,研究双馈机组在同步转速点运行特性,分析此特性对变流器可能造成的影响,得出IGBT失效的真实原因为双馈风电机组的同步转速工况下变流器机侧IGBT模块发热较严重,芯片在很小电流情况下便超过耐受温度而失效。给出一种IGBT在同步转速下的最大出力的计算方法,并对比3款常见IGBT在此工况下不同出力。结合工程实际给出适用于变流器的处理方案为降低开关频率,使用较好散热材料或散热方式等来保证变流器在此工况下的正常运行。A case of frequent insulated gate bipolar transistor(IGBT)breakdown on the side of converter at doubly-fed induction generator(DFIG)synchronous speed is presented a wind power plant in North China.Through simulation,the operation characteristics of DFIG at the synchronous speed point are studied,the possible influence of this characteristic on the converter is analyzed.It is concluded that the real reason of IGBT failure is that the IGBT module on the converter side is heated seriously under the synchronous speed condition of doubly fed wind turbine,and the chip will exceed the withstand temperature and fail under the condition of very small current.A calculation method of the maximum output of IGBT at this situation is presented,and compares the output of three common IGBT under this working condition.Combined with the engineering practice,the treatment scheme for converter is to reduce the switching frequency,and to use better heat dissipation materials or cooling methods to ensure the normal operation of the converter under this condition.

关 键 词：双馈异步电机 绝缘栅双极型晶体管 同步转速 变流器 

分 类 号：TM315[电气工程—电机]