基于极值优先过零检测法的相量测量算法

• 作 者: 刘鹏凯 李晓明 刘振盛 穆显勇 刘英 王坤杰
• 机 构: 武汉大学电气工程学院,湖北武汉,430072;湖北白莲河抽水蓄能有限公司,湖北黄冈,438600
• 出 处: 水电能源科学
• 发表日期: 2017年10期
• 关键词: extreme value first zero-crossing detection DFT dynamic phasor measurement optim

针对在测量同步电机变频启动过程暂态电压和电流时,被测信号频率测量不准确的问题,提出了基于极值优先过零检测法的相量测量算法,并利用理想信号模型对比分析了所提算法与传统DFT算法的性能.该算法利用输入数据的极值寻找信号的真实过零点,得到信号的实际频率,再通过真有效值的定义求取信号的有效值,具有易于实现、运算量较小、精度较高的优点;仿真结果表明所提方法在频率线性变化、幅值波动等条件下,具有良好的测量精度.研究结果为测量频率范围较大的信号相量提供借鉴.“,”Aiming at the problem of inaccurate measurement of the frequency of the measured signal when measuring the transient voltage and current of the synchronous motor,the phasor measurement algorithm based extreme value first zero crossing detection method was proposed,and the ideal signal model was used to analyze the algorithm and the performance of traditional DFT algorithm.The proposed algorithm applied the extreme value of the input data to find the true zero crossing of the signal for getting the actual frequency of the signal.And then the effective value of the signal was determined by the definition of the true value.It has the advantages of easy realization,small computation and high precision.The simulation results show that the proposed method has good measurement accuracy under the conditions of linear frequency variation,amplitude fluctuation and so on.The study provides a reference for measuring the signal phasor with large frequency range.