通过对周期性电压电流波形的起始时间与其相应的各 次谐波分量初始相位之间的关系进行研究，指出谐波源的特 性可以由其在基波电压初相位为零时的特性所唯一确定-Periodic voltage and current waveforms on the start time of its corresponding harmonic component of the relationship between the initial phase of research, pointed out th