基于小波和改进相关分析的介损测量方法

相关函数法用于介损在线测量时，电网频率波动及存在高次谐波等因素严重影响了基波相位测量的准确度。为了提高相关函数介损在线测量的准确度，文中首先对这种方法存在的问题进行了简要分析，在此基础上提出了对传统相关函数法进行改进的措施，其主要思想是对采样频率和数值积分方法进行修正和改善，并利用小波分析这一优良的时频分析工具提取基波信号。仿真分析和实践表明，改进方法较原有相关函数法在测量准确度上有较大的提高。

Dielectric Loss Measuring Based on Wavelet Analysis and Improved Correlation Function

When the correlation function algorithm is used to measure the dielectric loss, the measurement accuracy of fundamental wave can be badly affected by the fluctuation of system frequency and disturbance from harmonic and so on. To increase the on-line measurement accuracy, the problem that may debase the accuracy is studied firstly, then the approaches for improving the traditional correlation function method are put forward, with the main idea of improving and modifying the sampling frequency and numeric integral method. In addition, the wavelet analysis is used to distill the fundamental wave. Simulation and practical results verify the higher accuracy of the improved method.