一种用于背景谐波预估的电网等值方法研究  

An equivalent method of power network for the background harmonic prediction

作　　者：余晓鹏[1] 刘书铭[1] 李琼林[1] 张晓东[1] 代双寅[1] 

机构地区：[1]河南电力试验研究院,河南郑州450052

出　　处：《电力系统保护与控制》2012年第22期68-72,共5页Power System Protection and Control

摘　　要：直流输电工程交流滤波器参数设计时需要对换流站落点区域进行外网等值,通过建立正确的等值网络进行谐波潮流计算,以得到换流站网侧的背景谐波电压。针对网络结构复杂的系统采用何种方法进行外网等值这一问题,通过研究互阻抗支路对电压畸变率的影响规律,对等值阻抗进行简化处理,提出一种适用于背景谐波预估的电网等值方法。该方法简单方便、易于实现,有效解决了时域仿真时互阻抗支路较多、等值点接线复杂,并且可能出现负电阻引起仿真异常的问题,并以实际算例验证了该方法的有效性,具有重要的工程参考价值。AC filter parameters design of DC transmission project needs equivalent network of converter station drop point area. By establishing the correct equivalent network for harmonic power flow calculation, the converter station background harmonic voltage can be obtained. In view of the problem that how to realize the network equivalent of complex systems, we study the influence of the mutual impedance branch on the voltage distortion, simplify the equivalent impedance, and put forward a kind of network equivalent method applicable to background harmonic prediction. This method is simple and easy to implement, and effectively solves the problems that mutual impedance branches are more complex and may appear negative resistance causing abnormal time-domain simulation. In addition, the actual example verifies that this method is effective and has important engineering reference value.

关 键 词：直流输电 滤波器设计 电网等值 互阻抗 背景谐波 

分 类 号：TM711[电气工程—电力系统及自动化]