南方电网技术2017，Vol.11Issue(4)：58-63,70,7.DOI:10.13648/j.cnki.issn1674-0629.2017.04.009
基于反卷积算法的电容式电压互感器传递特性研究
Study on Transfer Characteristics of CVT Using Deconvolution Algorithm
李佳涵 1舒勤 1杨晓丽 1赵世林 1董兴建1
作者信息
- 1. 四川大学电气信息学院,成都 610065
- 折叠
摘要
Abstract
Capacitor voltage transformer (CVT) is widely applied to electric power system.It is beneficial to acquire the accurate transfer function of CVT for the protection and the monitoring of power system.At present, the reaserches about CVT are based on its typical equivalent circuit, however, due to the different internal parameters of CVT under different operating conditions, the transfer functions are different, which leads to inaccurate research results before.A square-wave pulse is applied to CVT when the internal structure parameters are not clear, then, the recursion method and the least square method are applied to caculate the impulse response of CVT based on convolution theorem, and Laplace transform is used to obtain the frequency transfer characteristics.The correctness of the theory and the reliability of the algorithm are verified by building the simulation circuit in PSCAD.Furthermore, the noise is added in the output signal, the anti-noise ability and noise impact factor of these two algorithms are analyzed in their algorithm structure.It is found that when noise is added, the anti-noise ability of the recursive method and the least square method are influenced by the length of convolution, both methods can get accurate results when the signal to noise ratio is larger than 40 dB.关键词
电容式电压互感器/冲激响应/卷积定理/递推/最小二乘法Key words
capacitor voltage transformer/impulse response/convolution theorem/recursion/least square method分类
信息技术与安全科学引用本文复制引用
李佳涵,舒勤,杨晓丽,赵世林,董兴建..基于反卷积算法的电容式电压互感器传递特性研究[J].南方电网技术,2017,11(4):58-63,70,7.
