摘要
创构了基于部分不对称开关角的优化脉冲波形(OptimalPartlyUnsymmetricalSwitchingangle,OPUS),提出了一种新型的优化部分不对称脉冲宽度调制方法(OPUS方法),它适用于大功率逆变器在灵活交流输电系统(FACTS)中的应用。该方法的原理是通过准确计算出开关角,实现在低于1kHz的调制频率下,采用OPUS方法对逆变器输出电压的基波和特定谐波实现幅度和相位的直接控制,给出了其中的算例。并采用FFT分析方法对其有效性进行了论证。
A novel pulse pattern based on optimal partly unsymmetrical switching angles for FACTS is proposed. The proposed pulse pattern owns only half-wave inverse symmetry, but its quarter-wave symmetry is absent so that the degree of freedom of switching angles is doubled, Therefore, the specific harmonics are controlled by their amplitudes and phase angles. Based on the proposed pulse pattern a new PWM strategy namely OPUS is developed. The exact switching angles, calculated by optimizing the pulse patterns, are shown. The proposed strategy has the advantage of enabling inverter control of the fundamental component and some specific order harmonics according to their amplitudes and phase angles. Especially, the inverter is operated in lower than 1kHz switching frequency. The validity is verified by FFT analysis.
出处
《电工技术学报》
EI
CSCD
北大核心
2006年第6期17-22,105,共7页
Transactions of China Electrotechnical Society
