中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2014年
9期
1337-1344
,共8页
郑昕昕%肖岚%田洋天%张方华
鄭昕昕%肖嵐%田洋天%張方華
정흔흔%초람%전양천%장방화
双Buck逆变器%半周期控制%过零畸变%LCL滤波器%稳定性
雙Buck逆變器%半週期控製%過零畸變%LCL濾波器%穩定性
쌍Buck역변기%반주기공제%과령기변%LCL려파기%은정성
dual-buck inverter%half-cycle control%zero-crossing distortion%LCL filter%stability
双Buck拓扑克服了传统桥式拓扑上下桥臂的直通问题,将其应用于三相并网逆变器,能够避免驱动信号死区引入的低次谐波,从而降低进网电流谐波含量,且外接快恢复二极管续流,减小了反向恢复损耗。然而,为消除电感的偏置电流以及提高逆变器效率,双Buck逆变器需采用半周期控制策略,导致了进网电流的过零畸变。针对带LCL滤波器的三相双Buck逆变器,分析半周期控制所导致过零畸变的原因,提出带纹波电流负反馈的半周期空间矢量脉宽调制(space vector pulse width modulation,SVPWM)控制方法,通过在过零点处改变空间电压矢量的基准,有效地消除了进网电流过零畸变,并讨论新型控制算法对系统稳定性的影响,通过仿真和实验验证理论分析。
雙Buck拓撲剋服瞭傳統橋式拓撲上下橋臂的直通問題,將其應用于三相併網逆變器,能夠避免驅動信號死區引入的低次諧波,從而降低進網電流諧波含量,且外接快恢複二極管續流,減小瞭反嚮恢複損耗。然而,為消除電感的偏置電流以及提高逆變器效率,雙Buck逆變器需採用半週期控製策略,導緻瞭進網電流的過零畸變。針對帶LCL濾波器的三相雙Buck逆變器,分析半週期控製所導緻過零畸變的原因,提齣帶紋波電流負反饋的半週期空間矢量脈寬調製(space vector pulse width modulation,SVPWM)控製方法,通過在過零點處改變空間電壓矢量的基準,有效地消除瞭進網電流過零畸變,併討論新型控製算法對繫統穩定性的影響,通過倣真和實驗驗證理論分析。
쌍Buck탁복극복료전통교식탁복상하교비적직통문제,장기응용우삼상병망역변기,능구피면구동신호사구인입적저차해파,종이강저진망전류해파함량,차외접쾌회복이겁관속류,감소료반향회복손모。연이,위소제전감적편치전류이급제고역변기효솔,쌍Buck역변기수채용반주기공제책략,도치료진망전류적과령기변。침대대LCL려파기적삼상쌍Buck역변기,분석반주기공제소도치과령기변적원인,제출대문파전류부반궤적반주기공간시량맥관조제(space vector pulse width modulation,SVPWM)공제방법,통과재과영점처개변공간전압시량적기준,유효지소제료진망전류과령기변,병토론신형공제산법대계통은정성적영향,통과방진화실험험증이론분석。
The dual-buck topology overcomes the straight-through problem of the traditional bridge topology. Its applications in three-phase grid-connected inverters can avoid low frequency harmonics caused by the dead-time and reduce the grid current harmonic. External fast recovery diodes can reduce the reverse recovery loss. However, to eliminate the bias current of the inductor and improve the efficiency, the driving signal could only exist in a half grid-cycle, which may lead to zero-crossing distortion. This paper analyzed the cause of zero-crossing distortion of the half-cycle controlled three-phase dual-buck inverter with the LCL filter. A new control strategy with ripple current negative feedback is proposed, with which the zero-crossing distortion can be inhibited by changing the reference voltage space vector in the zero-crossing points. What’s more, the influence on the stability of the system with the new control method is discussed. Finally, the simulation and experimental results verified the theoretical analysis.