规则采样对载波移相SPWM输出基波相位滞后的影响  

The Effect of Regulated Sampling on Phase Delay of Phase-Shift SPWM Output

作　　者：袁志昌[1] 宋强[1] 刘文华[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电工技术学报》2010年第11期107-112,共6页Transactions of China Electrotechnical Society

摘　　要：载波移相SPWM具有高度的实时性,非常适合输出电压需要快速变化的场合。本文讨论了载波移相SPWM应用于诸如STATCOM、DTSTACOM等高压大容量逆变器场合可能遇到的一个实际问题:载波移相SPWM在数字化实现中通常需要按照规则采样的方法计算开关角度,规则采样的原理决定了载波移相SPWM输出电压相位必然落后参考波一定的相位。本文分析了这一现象形成的机理,以三电平规则采样PS-SPWM为例推导了滞后相位的计算公式,通过数值仿真和物理样机试验验证了分析结论以及计算方法的正确性。最后,针对规则采样PS-SPWM应用于链式STATCOM时可能遇到的问题提出解决方案,可供工程应用参考。Phase-shift sinusoidal pulse width modulation（PS-SPWM） has advantage on performance of real-time realization,which makes it fairly suitable for applications where output voltage need fast responsibility.This paper discusses the problem of realization of PS-SPWM when applied to high voltage-high power inverter such as static synchronous compensator（STATCOM） or distribution static compensator（DSTATCOM）.Regulated sampling is the most popular realization method of PS-SPWM,which will cause phase delay between output voltage of PS-SPWM and referenced wave.The mechanism and calculating method of phase delay caused by regulated sampling is analyzed,which are verified through digital simulation and experiment on a prototype inverter.At last,a compensation method eliminating the affection of phase delay when applied to cascade multilevel STATCOM is proposed.

关 键 词：载波移相SPWM 规则采样 链式多电平逆变器 静止同步补偿器 

分 类 号：TM762[电气工程—电力系统及自动化]