CAJ | 학술논문

针对双馈风电机组机侧变流器长期处于低频下运行导致故障率高的机理问题,提出其功率器件绝缘栅型双极性晶体管( IGBT)结温准确计算方法及其变化规律的研究. 首先基于不同损耗分析方法,结合IGBT热网络,建立了IGBT结温计算模型,并对一个实际IGBT在不同结温计算方法下的稳态结温进行比较. 其次,结合双馈风电机组运行特性,分别建立其全范围工况下机侧变流器IGBT的结温计算模型. 最后,分析了双馈风电机组在不同风速下机侧变流器IGBT稳态结温变化规律及其影响因素. 结果表明,基于开关周期损耗的结温计算方法更适合较低频率运行下IGBT结温的准确计算;双馈风电用机侧变流器IGBT稳态结温波动幅值随变流器输出频率的降低而增大.
침대쌍궤풍전궤조궤측변류기장기처우저빈하운행도치고장솔고적궤리문제,제출기공솔기건절연책형쌍겁성정체관( IGBT)결온준학계산방법급기변화규률적연구. 수선기우불동손모분석방법,결합IGBT열망락,건립료IGBT결온계산모형,병대일개실제IGBT재불동결온계산방법하적은태결온진행비교. 기차,결합쌍궤풍전궤조운행특성,분별건립기전범위공황하궤측변류기IGBT적결온계산모형. 최후,분석료쌍궤풍전궤조재불동풍속하궤측변류기IGBT은태결온변화규률급기영향인소. 결과표명,기우개관주기손모적결온계산방법경괄합교저빈솔운행하IGBT결온적준학계산;쌍궤풍전용궤측변류기IGBT은태결온파동폭치수변류기수출빈솔적강저이증대.
Aiming at the high fault rate mechanism problem caused by low frequency operation on long pe-riod for generator-side power converter of doubly fed wind generator system, a calculation method of insu-lated gate bipolar transistor ( IGBT) junction temperature and effects analysis were investigated. Firstly, combined with the thermal network model, two calculation models of the IGBT junction temperature were proposed based on different loss analysis methods and the comparison of different junction temperature calculation was performed by using a practical IGBT converter. Secondly, according to the operational characteristics of doubly fed wind generator system, the calculation model of IGBT junction temperature was presented for overall operational conditions. Finally, the effects of the IGBT steady state junction temperature for generator-side power converter were analyzed for different wind speed. Results show that compared with the junction temperature calculation method based on the output cycle average loss, the method based on IGBT switching cycle loss is more suitable to accurately calculate IGBT junction temper-ature when the power converter works in a low output frequency, and the amplitudes of IGBT steady state junction temperature of generator-side power converter increases with the decrease in operational frequency.