中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2012年
12期
67-74
,共8页
集成门极换流晶闸管%箝位电路%吸收电路%最小脉宽%IGCT变流器
集成門極換流晶閘管%箝位電路%吸收電路%最小脈寬%IGCT變流器
집성문겁환류정갑관%겸위전로%흡수전로%최소맥관%IGCT변류기
integrated gate commutated thyristor(IGCT)%clamping circuit%snubber circuit%minimum pulse width%IGCT converters
近年来对风机容量的要求出现了爆发式增长,已达3~7 MW。此外,并网谐波控制、低电压过渡等风机并网标准越来越严苛。以集成门极换流晶闸管（integrated gatecommutated thyristor,IGCT）为核心的中压直驱全功率变流装置既可满足风机的大容量要求,又能灵活实现电网故障过渡、电网无功支撑等要求,成为大容量风机的最优选择。在IGCT变流器中,箝位电路的参数将直接影响器件SOA、最小脉宽与并网电流质量,是风机功率模块设计中十分重要的部分。提出一套IGCT变流器吸收箝位电路的优化设计方法,显著简化了箝位电路的设计过程。在对箝位电路换流工况进行详细分析的基础上,提出了箝位电路的等效电路。根据等效电路进行了响应分析,综合考虑箝位电路的设计原则,找到了优化参数的选取方法,从而降低了最小脉宽限制,提高了动态恢复速度。给出了设计实例,并进行了仿真与实验验证。
近年來對風機容量的要求齣現瞭爆髮式增長,已達3~7 MW。此外,併網諧波控製、低電壓過渡等風機併網標準越來越嚴苛。以集成門極換流晶閘管（integrated gatecommutated thyristor,IGCT）為覈心的中壓直驅全功率變流裝置既可滿足風機的大容量要求,又能靈活實現電網故障過渡、電網無功支撐等要求,成為大容量風機的最優選擇。在IGCT變流器中,箝位電路的參數將直接影響器件SOA、最小脈寬與併網電流質量,是風機功率模塊設計中十分重要的部分。提齣一套IGCT變流器吸收箝位電路的優化設計方法,顯著簡化瞭箝位電路的設計過程。在對箝位電路換流工況進行詳細分析的基礎上,提齣瞭箝位電路的等效電路。根據等效電路進行瞭響應分析,綜閤攷慮箝位電路的設計原則,找到瞭優化參數的選取方法,從而降低瞭最小脈寬限製,提高瞭動態恢複速度。給齣瞭設計實例,併進行瞭倣真與實驗驗證。
근년래대풍궤용량적요구출현료폭발식증장,이체3~7 MW。차외,병망해파공제、저전압과도등풍궤병망표준월래월엄가。이집성문겁환류정갑관（integrated gatecommutated thyristor,IGCT）위핵심적중압직구전공솔변류장치기가만족풍궤적대용량요구,우능령활실현전망고장과도、전망무공지탱등요구,성위대용량풍궤적최우선택。재IGCT변류기중,겸위전로적삼수장직접영향기건SOA、최소맥관여병망전류질량,시풍궤공솔모괴설계중십분중요적부분。제출일투IGCT변류기흡수겸위전로적우화설계방법,현저간화료겸위전로적설계과정。재대겸위전로환류공황진행상세분석적기출상,제출료겸위전로적등효전로。근거등효전로진행료향응분석,종합고필겸위전로적설계원칙,조도료우화삼수적선취방법,종이강저료최소맥관한제,제고료동태회복속도。급출료설계실례,병진행료방진여실험험증。
In recent years,the power ratings of wind turbines has increased dramatically to 3~7？MW.Meanwhile,the requirements of the wind farm grid code are getting stricter in harmonic control,low voltage ride through and so on.The medium voltage full-scale converters equipped with the integrated gate commutated thyristor（IGCT） can not only manage the high power ratings,but also meet the requirements of grid fault ride-through and reactive power exchange,so it becomes the best choice for high power wind turbines.The optimal design of the clamping circuit is an important part of the design of IGCT converters,which will highly impact on the SOA,minimum pulse width and grid current quality.A novel design method of the clamping circuit in IGCT converters was proposed in this paper and the calculation process has been greatly simplified.After a detailed analysis of the clamping circuit commutating process,an equivalent circuit was presented and its response analysis was made.According to the design rule of the clamping circuit,an optimal parameter design method was introduced,which can reduce the minimum pulse width and speed up the dynamic recovery process.Finally,a design example was presented.Simulations and experiments verify the correctness and validity of the result.
