电网电容电流的最小二乘法辨识算法  

Least square identification algorithm of capacitive current in power grid

作　　者：刘毅敏 高广峰 

机构地区：[1]山西省阳泉市供电分公司,山西阳泉045000

出　　处：《电力系统保护与控制》2010年第8期49-52,58,共5页Power System Protection and Control

摘　　要：介绍一种测量计算电网电容电流的新方法。该方法不同于传统测量方法,是在信号注入法的基础上,结合系统辨识理论,从PT二次侧进行采样,通过输入和输出间的数学模型,采用递推式最小二乘法进行辨识计算,最终计算出电网电容电流。辨识算法的程序开发选用DSP芯片,采用C语言编程,能够达到较高的辨识速度和精度要求。最后,运用Matlab对电压互感器PT回路的建模,在CCS2.20中仿真运行递推式最小二乘法算法程序,通过试验证实了这种方法的精确性和实时性。This paper introduces a new method of measuring capacitive current in power grid. This method is different from the other traditional methods. It is based on the signal injection method and combined with the theory of system identification, sampling data from the secondary side of PT, through the mathematical model between the input and the output, at last, using recursive least square method to identify and calculate the capacitive current. DSP chip is selected to finish the identification algorithm＇s program development and C language is adopted for programming, so as to achieve a higher speed and accuracy of identification requirements Finally, this paper uses the model of PT circuit which is established by Matlab and runs recursive least square algorithm program in CCS2.20 to simulate, to experimentally confirm the accuracy and real-time of this method.

关 键 词：电容电流 信号注入法 系统辨识 最小二乘法 DSP 

分 类 号：TM744[电气工程—电力系统及自动化]