CAJ | 학술논문

级联多电平高压大容量变流器已广泛应用于电力系统中，载波移相式正弦脉宽调制（CPS-SPWM）技术非常适用于大功率变流器场合。文中分别介绍了双极性CPS-SPWM调制方法和单极倍频CPS-SPWM调制方法，并基于PSCAD/EMTDC软件搭建仿真模型，采用频谱分析方法对其进行对比，结果表明采用双极性CPS-SPWM调制方法输出电压的最低次谐波群出现在N（N是指每相级联单元数）倍的载波频率附近，其等效开关频率提高了N倍，采用单极倍频CPS-SPWM调制方法的输出电压的最低次谐波群出现在2N倍的载波频率附近，其等效开关频率提高了2N倍，因此采用单极倍频CPS-SPWM调制方法其输出波形更接近正弦波，具有更好的消除谐波的特性。
급련다전평고압대용량변류기이엄범응용우전력계통중，재파이상식정현맥관조제（CPS-SPWM）기술비상괄용우대공솔변류기장합。문중분별개소료쌍겁성CPS-SPWM조제방법화단겁배빈CPS-SPWM조제방법，병기우PSCAD/EMTDC연건탑건방진모형，채용빈보분석방법대기진행대비，결과표명채용쌍겁성CPS-SPWM조제방법수출전압적최저차해파군출현재N（N시지매상급련단원수）배적재파빈솔부근，기등효개관빈솔제고료N배，채용단겁배빈CPS-SPWM조제방법적수출전압적최저차해파군출현재2N배적재파빈솔부근，기등효개관빈솔제고료2N배，인차채용단겁배빈CPS-SPWM조제방법기수출파형경접근정현파，구유경호적소제해파적특성。
Cascade multilevel, high voltage and large capacity inverters have been widely used in electric power systems. Carrier phase shifted sinusoidal pulse width modulation (CPS-SPWM) technique is very suitable for the high power inverter. In the paper, bipolar CPS-SPWM and single pole double frequency CPS-SPWM modulation method are presented respectively, and a simulation model based on PSCAD/EMTDC software is built. Comparative analysis for these two methods is made by adopting frequency spectrum analysis method. Simulation results have proved that the lowest harmonics of the output voltage are centralized near the N times of the carrier frequency, and the equivalent switch frequency is improved by N (N is the number of the cascade SVG for each phase) times by adopting bipolar CPS-SPWM. The lowest harmonics of the output voltage are centralized near the 2N times of the carrier frequency, and the equivalent switch frequency is improved by 2N times by adopting single pole double frequency CPS-SPWM. Therefore, the single pole double frequency CPS-SPWM modulation method is better to eliminate the harmonics, and its output voltage fits sine wave better.