现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2015年
10期
151-155
,共5页
孙健%刘刚%赵宇%高亚春%牛虎%宋堃
孫健%劉剛%趙宇%高亞春%牛虎%宋堃
손건%류강%조우%고아춘%우호%송곤
三电平变流器%中点钳位%中点电压平衡%零序电压
三電平變流器%中點鉗位%中點電壓平衡%零序電壓
삼전평변류기%중점겸위%중점전압평형%령서전압
three-level converter%neutral-point clamp%neutral-point voltage balance%zero sequence voltage
针对高电压穿越条件,分析中点钳位型三电平变流器的中点电压数学模型,推导出三相功率与零序电压的传递函数。提出一种新型的注入零序电压控制方案,该方案通过控制中点处的零序总功率为0,来实现中点电压的平衡控制。具体方案是,通过计算中点处的三相功率偏差,经PI调节器输出零序电压调制波,经过3s/2s坐标变换,叠加至三相基波调制波,并采用SVPWM调制算法实现。仿真显示,该方案能够实现中点电压的平衡控制,具有较好的动态响应。
針對高電壓穿越條件,分析中點鉗位型三電平變流器的中點電壓數學模型,推導齣三相功率與零序電壓的傳遞函數。提齣一種新型的註入零序電壓控製方案,該方案通過控製中點處的零序總功率為0,來實現中點電壓的平衡控製。具體方案是,通過計算中點處的三相功率偏差,經PI調節器輸齣零序電壓調製波,經過3s/2s坐標變換,疊加至三相基波調製波,併採用SVPWM調製算法實現。倣真顯示,該方案能夠實現中點電壓的平衡控製,具有較好的動態響應。
침대고전압천월조건,분석중점겸위형삼전평변류기적중점전압수학모형,추도출삼상공솔여령서전압적전체함수。제출일충신형적주입령서전압공제방안,해방안통과공제중점처적령서총공솔위0,래실현중점전압적평형공제。구체방안시,통과계산중점처적삼상공솔편차,경PI조절기수출령서전압조제파,경과3s/2s좌표변환,첩가지삼상기파조제파,병채용SVPWM조제산법실현。방진현시,해방안능구실현중점전압적평형공제,구유교호적동태향응。
For high?voltage across conditions,the neutral point voltage mathematical model of neutral?point?clamped three?level converter is analyzed and three?phase power & zero?sequence voltage transfer function is derived. A novel zero?sequence voltage injection strategy for neutral?point voltage balance is proposed. The strategy,which uses three?phase power to calculate the zero?sequence voltage component,and overlaps it to the fundamental?wave modulation wave through 3s/2s coordinate transfor?mation,is realized. Matlab simulation of control strategy shows good dynamic response effect.