交直流输电系统的非特征谐波分析

Non-characteristic Harmonics Analysis of AC/DC Transmission System

提出一种新的交直流输电系统的非特征谐波计算方法．其中单个三相六脉冲换流装置的数学模型可以同时计及换流变压器三相参数不等、交流母线三相电压不对称并含有谐波分量以及触发脉冲时间间隔不均匀等因素的影响，与直流网络和交流网络的谐波导纳矩阵数学模型一起组成全系统的方程式．以全系统的基波和特征谐波潮流解为迭代初值，采用高斯－塞德尔方法对方程式进行求解．该方法具有编程相对简单、计算速度快等特点，可用于非特征谐波含量的计算，为选择抑制谐波措施、分析滤波效果提供依据．

A novel approach to the calculation of non characteristic harmonics is presented for the AC/DC power systems,which has taked such asymmetrical conditions as:imbalanced impedances of converting transformer,asymmetrical three phase fundamental voltages of AC busbar with any superimposed harmonics,and unequal firing pulse spaces in the mathematical model of three phase six pulse converter.Taking the harmonics power flow solution of the AC/DC systems as initial iterative values,it solves the system equations by using Gauss Sideral Method.Results may be used in many aspects such as design of AC or DC filters.