一种新的多馈入交直流受端系统静态电压稳定的评价指标  

A New Evaluation Index for Static Voltage Stability of Multi-Infeed HVDC Receiving Terminal System

作　　者：武倩羽 王婧[1] 祝培鑫 张恺[1] 黄永章[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京

出　　处：《智能电网（汉斯）》2017年第3期214-224,共11页Smart Grid

摘　　要：多馈入受端系统静态电压稳定的研究一般都是建立在多端口戴维南等值模型的基础上,各条直流馈入之间的互阻抗使得已有的多馈入交直流受端系统静态电压稳定评价指标与受端线路电压稳定的对应关系不明确。在多端口戴维南等值模型的基础上对多馈入受端系统节点阻抗矩阵进行对角化,用对角线元素即节点阻抗矩阵的特征值来等效各条直流馈入相对应的交流系统的阻抗值,实现了多馈入系统的解耦,将多馈入直流输电系统等效为多个单馈入系统来研究。在解耦模型的基础上提出了新的多馈入受端系统静态电压稳定评价指标。应用BPA软件进行故障仿真,对两个新评价指标计算值不同的简单三馈入系统进行故障仿真,对比两个三馈入系统故障后的电压稳定性。The study on the static voltage stability of multi-infeed DC systems is generally based on multi port Thevenin equivalent model. The mutual impedance between the DC infeeds makes the corresponding relation between the static voltage stability evaluation index and the voltage stability at the receiving end of the multi-infeed AC/DC system uncertain. This letter diagonalizes the node impedance matrix of the multi-infeed HVDC receiving system based on Thevenin equivalent model to propose a new equivalent terminal decoupling model. Based on the decoupling model, a new static voltage stability evaluation index for multi-infeed HVAC/HVDC system is proposed. BPA software is used to simulate two multi-infeed systems with different evaluation indexes;we set line fault in the two systems and compare the voltage waveforms of the receiving terminal buses to determine the voltage stability of two systems.

关 键 词：多馈入交直流系统 电压稳定 系统解耦模型 静态电压稳定评价指标 等值阻抗特征值 最大特征值 

分 类 号：TM7[电气工程—电力系统及自动化]