作　　者： ; ; ; ; ;

机构地区： 华南理工大学电力学院

出　　处： 《中国电机工程学报》 2010年第19期64-68,共5页

摘　　要： 计算换流器的等值谐波阻抗并分析其频率特性是研究高压直流(high voltage direct current,HVDC)系统谐波不稳定的关键,而交流系统不对称故障有可能导致换流器等值谐波阻抗的变化。在同时考虑换流阀导通时刻偏移、三相换相角不相等和换相电流非线性特性的情况下,以换流器的改进开关函数模型为基础,提出适用于正常工况和故障情况下的换流器交、直流两侧等值谐波阻抗的计算方法。利用PSCAD/EMTDC电磁暂态仿真软件,基于国际大电网会议(conference international des grands reseaux,CIGRE)HVDC系统标准模型,对该方法进行仿真验证,结果表明其准确有效。 Calculation of impedance-frequency characteristic of high voltage direct current （HVDC） converter is a key problem in analyzing the harmonic instability. Based on the advanced switching-function model of the converter, which contributes to the effects of variation of switching instants, unbalanced commutation overlaps and the nonlinear commutation currents and is suitable for the analysis of operating and fault characteristic for AC/DC system, an analysis and calculation method of AC-side and DC-side equivalent impedance frequency characteristic of HVDC converter was proposed. Using PSCAD/EMTDC software, the method was verified to be accurate and effective by simulation based on CIGRE HVDC first benchmark model.

关 键 词： 高压直流系统 开关函数 换流器等值阻抗 阻抗频率特性

领　　域： [电气工程]