【摘要】 在分析传统软件锁相环工作原理和负序分量影响锁相环检测性能的基础上,提出了一种改进的软件锁相环,设计了一种在传统软件锁相环的基础之上,正负序分量分离的方法来消除负序分量的干扰。理论分析和仿真试验结果表明了其可行性,该方法能够消除负序分量转换而来的2次谐波,在动态相位跟踪及不平衡电压检测方面的性能有了显著改善。更多还原

【Abstract】 Based on the analysis of the working principle of soft phase lock loop(PLL) and the influence of negative sequence voltage components on the PLL’s detecting performance,an improved PLL was proposed.Based on the traditional software phase-lock loop,a method of sepavating positive and negative sequence components to eliminate the interference of negative sequence component was designed.The theoretical analysis and expreimental results proved its feasibility.The result showed that this method could eliminate the second harmonic converted from the negative sequence,under three-phase imbalance,the dynamic phase tracking performance and voltage detection had been improved significantly.更多还原