计算电容型设备介质损耗因数的相关函数法的改进  

IMPROVEMENT TO CORRELATION ALGORITHM FOR DIELECTRIC DISSIPATION FACTOR CALCULATION OF CAPACITANCE EQUIPMENTS

作　　者：左自强[1] 徐阳[1] 曹晓珑[1] 刘斌[2] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西省西安市710049 [2]西安交通大学科技园博源电气公司,陕西省西安市710054

出　　处：《电网技术》2004年第18期53-57,共5页Power System Technology

摘　　要：由于不能在整周期区间内准确积分, 当采样频率与电网信号频率不同步时,采用有限时间离散相关函数法计算电容型设备的介质损耗因数(介损)会产生较大的误差。采用插值法修正了相关函数法的积分区间,用梯形积分代替矩形积分,采用优化的采样频率和采样点数来提高计算精度仿真实验表明经过修正的相关函数法对电网频率波动有较强的抑制能力,可明显减少介损的计算误差,从而不必使用同步采集卡。此外,该方法的采样频率不高、采样点数不多,易于通过基于微控制器单元(MCU)或数字信号处理器(DSP)的测量系统实现。Because it was unable to integrate in a full period, a remarkable error would appear in the calculation of dielectric dissipation factors of capacitance equipments by traditional finite time discrete correlation algorithm when the sampling frequency was not synchronous with power network signal's frequency. The authors calibrated the integration interval by linear interpolation, used the trapezoidal integration to replace the rectangular integration and applied the optimal sampling frequency and sample size to improve calculation accuracy. The simulation shows that the calibrated correlation function method possesses stronger inhibition capability and can significantly reduce the calculation error of dielectric dissipation factor, thereby, the synchronous sampling card is no more needed. In addition, the sampling frequency of the proposed method is not high as well as the sample size is not large, so it is easy to implement for the proposed method by the measuring system based on micro-controller unit (MCU) or digital signal processor (DSP).

关 键 词：电容型设备 介质损耗因数 介损 电网频率 采样频率 信号频率 微控制器 相关函数 采样点 数字信号处理器(DSP) 

分 类 号：TM855[电气工程—高电压与绝缘技术] TM934.32