基于牛顿—拉夫逊法的配电网电容电流测量新方法  

A new capacitive current measurement method of distribution network based on Newton-Raphson method

作　　者：闫腾飞[1] 李康[1] 李晓波[1] 丁欣[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电力系统保护与控制》2017年第7期1-5,共5页Power System Protection and Control

基　　金：国家自然科学基金项目(51107143)~~

摘　　要：提出了一种基于牛顿—拉夫逊法的配电网电容电流测量新方法。在消弧线圈并联阻尼电阻接地的系统中,采用有效且快速收敛的牛顿—拉夫逊法,寻找改变阻尼电阻之后保持中性点电压相位不变的消弧线圈电感量。在此基础上,确定系统失谐量与系统总电导相位夹角不变并构建相位关系图,实现系统对地电容和对地电导的精确测量,最终实现配电网电容电流测量。通过在Matlab中搭建仿真模型并进行仿真实验,验证了所提出的测量方法的正确性以及测量结果具有较高精度。A capacitive current measurement method of the distribution network is proposed based on Newton-Raphson Method. In the system of arc suppression coil and damping resistance grounding system, the Newton-Raphson method is of effectiveness and fast convergence calculation. After the damping resistance is changed, finding that the inductance of arc suppression coil which can keep constant neutral point voltage unchanged. On this basis, it is determined that the phase angle is constant between detuning size and total conductance of the system and the phase diagram is constructed. The accurate calculation of the capacitance and the ground electric conduction is realized. Finally, the capacitive current measurement is realized. By building the simulation model in Matlab and simulation experiment, the correctness of the proposed measurement method and higher accuracy of the measurement results are verified.

关 键 词：牛顿-拉夫逊法 中性点电压 相位关系 MATLAB 

分 类 号：TM933.1[电气工程—电力电子与电力传动]