基于Prony的故障电流相控分断零点预测算法  

Prediction Algorithm for Phase-controlled Fault Interruption Based on Prony Method

作　　者：李红蕾[1] 冯英[2] 袁召[1] 李辉[2] 喻新林 何俊佳[1] 潘垣[1] 

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074 [2]中国电力科学研究院,北京100192

出　　处：《高压电器》2014年第9期29-34,共6页High Voltage Apparatus

基　　金：中国电力科学研究院院士团队项目(GY-7113013)~~

摘　　要：目标过零点的快速、准确预测是实现短路故障电流相控开断的基础。笔者根据短路电流信号特点,提出将Prony算法应用于故障电流相控分断时的零点预测。推导了Prony算法的求解过程,通过计算频率、幅值、相位等参数,得到采样信号的还原波形,进而求取目标电流零点。在MATLAB中设置理想信号进行算例验证,结果说明Prony算法的参数计算误差小,波形拟合度高。在谐波环境下,采用1/4周期长数据与安全点算法进行了对比。结果显示,相比安全点算法,Prony算法对谐波更加稳定,波形拟合精度更高。Fast and accurate prediction of zero-crossing points of fault current lays the foundation of the phasecontrolled fault interruption. In this paper, a new algorithm is proposed to predict the zero-crossing points based on Prony method. By calculating the frequencies, amplitudes, phases, etc., the original waveform is obtained through fitting the sampled signal to calculate the objective zero points. An ideal signal is set in MATLAB to test the effectiveness of the proposed algorithm, and the result shows that the algorithm gains high SNR and very small margin of error. Moreover, compared with the safe-point algorithm, Prony algorithm demonstrates better fitting degree of waveform and higher stability to harmonics in the condition of 1/4 sampling cycle and triple-frequency harmonics.

关 键 词：过零点 故障电流相控开断 PRONY算法 安全点算法 

分 类 号：TM564[电气工程—电器]