中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2012年
6期
56-63
,共8页
H桥级联多电平变流器%静止同步补偿器%三相三线制系统%正负序电流分离%直流电压平衡控制
H橋級聯多電平變流器%靜止同步補償器%三相三線製繫統%正負序電流分離%直流電壓平衡控製
H교급련다전평변류기%정지동보보상기%삼상삼선제계통%정부서전류분리%직류전압평형공제
cascade H-bridge multilevel converter%static synchronous compensator（STATCOM）%three-phase three-wire power system%positive and negative sequence current separating%DC bus voltage balance control
H桥级联多电平变流器是一个非线性、多变量、强耦合系统,其中单个功率模块的直流母线电压平衡问题严重影响该类型装置的输出性能,并限制其应用范围。对变流器与系统之间的功率交换模型进行详细的数学推导,得出可以通过控制变流器负序电流、零序电压或负序电压的方式达到控制单相直流电压平衡的控制规律。结合全局平均直流电压控制策略和单模块直流电压控制策略,提出基于正负序电流分离解耦控制的通用三级直流母线电压控制方法,解决了H桥级联多电平变流器的直流母线电压平衡问题,并提高了装置的输出性能。仿真和实验验证了所提直流电压控制策略的有效性和可行性。
H橋級聯多電平變流器是一箇非線性、多變量、彊耦閤繫統,其中單箇功率模塊的直流母線電壓平衡問題嚴重影響該類型裝置的輸齣性能,併限製其應用範圍。對變流器與繫統之間的功率交換模型進行詳細的數學推導,得齣可以通過控製變流器負序電流、零序電壓或負序電壓的方式達到控製單相直流電壓平衡的控製規律。結閤全跼平均直流電壓控製策略和單模塊直流電壓控製策略,提齣基于正負序電流分離解耦控製的通用三級直流母線電壓控製方法,解決瞭H橋級聯多電平變流器的直流母線電壓平衡問題,併提高瞭裝置的輸齣性能。倣真和實驗驗證瞭所提直流電壓控製策略的有效性和可行性。
H교급련다전평변류기시일개비선성、다변량、강우합계통,기중단개공솔모괴적직류모선전압평형문제엄중영향해류형장치적수출성능,병한제기응용범위。대변류기여계통지간적공솔교환모형진행상세적수학추도,득출가이통과공제변류기부서전류、령서전압혹부서전압적방식체도공제단상직류전압평형적공제규률。결합전국평균직류전압공제책략화단모괴직류전압공제책략,제출기우정부서전류분리해우공제적통용삼급직류모선전압공제방법,해결료H교급련다전평변류기적직류모선전압평형문제,병제고료장치적수출성능。방진화실험험증료소제직류전압공제책략적유효성화가행성。
The converter based on cascaded H-bridge multilevel topology is a nonlinear multiple variable and strong coupling system,in which the DC bus voltage balancing problem of single power module affects the output performance of similar equipment seriously,moreover restricts its applications.This paper analyzed the power exchanging relationship between converters and power systems in detail,and obtained a control law,which can balance the single phase dc bus voltage by controlling negative sequence currents,or zero sequence voltages,or negative sequence voltages of the converter.Combining the global average DC voltage control and the single module DC voltage control,the paper presented a universal three-step decoupling control strategy,which based on the separated positive and negative sequence currents,and which can solve the DC bus voltage balancing problem of cascaded H-bridge multilevel converters.In addition,it can improve the output capability of converters.The validity and feasibility of special DC bus voltage control strategy is verified by simulation results and experimental results.
