基于谐振频率预测模型的配电网电容电流测量方法  

Capacitive Current Measuring Method for Distribution Networks Based on Resonant Frequency Prediction Model

作　　者：贺良华 葛来[1,2] 孙宝金 

机构地区：[1]中国地质大学(武汉)自动化学院,湖北省武汉市430074 [2]复杂系统先进控制与智能自动化湖北省重点实验室中国地质大学(武汉),湖北省武汉市430074

出　　处：《电力系统自动化》2018年第2期143-147,159,共6页Automation of Electric Power Systems

摘　　要：现有配电网电容电流测量的信号注入法在测量精度和速度上暂不能达到平衡,为更适应测量系统快速跟踪变化的要求,提出了一种谐振频率预测模型。该模型直接根据波形波峰间的时间差进行谐振频率的计算,能够快速确定电容电流大小,大大缩短测量时间。为有效消除具有一定频率偏差的工频信号干扰,设计了级联陷波器对中性点电压信号进行处理。多组仿真实验证明,该模型测量方法可有效消除工频信号干扰,计算简便,测量精度高、速度快。The existing signal injection method for measuring the capacitive current in the distribution network is still unable to reach the equilibrium between the measuring accuracy and the measuring speed. To better meet the fast tracking requirement of the measuring system, a resonant frequency prediction model is proposed. In this model, the resonant frequency is calculated according to the time difference between the peaks of the waveform, and the capacitive current value is quickly determined,which greatly reduces the measurement time. To effectively eliminate interference of the power frequency signal with a frequency deviation, a cascaded notch filter is designed to process the neutral voltage. Multiple simulation results show that the proposed method is able to ef{ectively inhibit the power frequency interference with simple calculation and high measuring accuracy and speed.

关 键 词：谐振频率预测 电容电流 测量时间 工频干扰 陷波器 

分 类 号：TM933.1[电气工程—电力电子与电力传动]