基于频率响应特性分析的滤序滤波结合算法研究

RESEARCH ON FREQUENCY RESPONSE BASED ALGORITHM COMBINING SEQUENCE FILTERING WITH HARMONIC FILTERING

采用基波序分量构成的数字保护方案已有很多。文中分析了响应时间为1/3工频周期的滤序算法的频率响应特性,并在此基础上提出了根据滤序算法频率响应特性设计数字滤波器的思想,推导出了滤序滤波结合算法,仿真实验结果表明,滤序滤波结合算法具有计算量小、响应速度较快、滤波精度较高等特点。

There are many kinds of digital protection schemes based on power frequency sequence components. Here, the frequency response characteristics of sequence component filtering algorithm whose response time is one third of period under power frequency is analyzed. On this basis a thinking of designing digital filter according to frequency response of sequence component filtering is proposed and an algorithm combining sequence component filtering and harmonic filtering is deduced. Simulation results show that the advantages of the deduced algorithm are smaller calculation amount, higher response speed and higher filtering accuracy, etc.