高压直流输电交流滤波器参数的计算

无功补偿和电压控制是高压直流输电工程中的重要问题。交流滤波器可以滤除交流侧谐波并补偿无功功率，所以广泛应用于高压直流输电工程中。交流滤波器必须满足在各种工况下的交流侧谐波性能和无功功率补偿要求。首先给出单调谐滤波器参数计算的方法和精确公式；在双调谐和三调谐滤波器的参数计算过程中，通过把双调谐、三调谐滤波器等效成2个或3个单调谐滤波器，先计算得到各个单调谐滤波器参数，再经过该文给出的等效公式得到双调谐和三调谐滤波器参数，并通过定值计算和性能计算验证交流滤波器的元件参数能够符合系统要求。给出了一个三调谐滤波器计算的例子。通过仿真，得到三调谐滤波器和等效的3个单调谐滤波器的阻抗频率特性曲线，并加以对比，结果表明这种参数计算方法符合工程精度要求。介绍了另一种基于交流滤波器阻抗频率特性的滤波器参数计算方法并将两者做了对比，分析了2种滤波器参数计算方法的优缺点。

Algorithm for the Parameters of AC Filters in HVDC Transmission System

In conjunction with the reactive power exchange and AC voltage control, the issue of harmonic performance is one of the main power quality topics of high voltage direct current (HVDC) transmission projects. AC filters are widely used to restrain the AC side harmonics and to compensate for reactive power. The design of the AC filters has to satisfy the requirements of harmonic performance and reactive power compensation for the various operation modes. First of all the algorithm of the parameters of the single tuned filter are presented. Then during the process of designing double-tuned filter and triple-tuned filter, two single tuned filters and three single tuned filters are designed to meet the need of reactive power compensation and the standard of harmonic restraint performance. With the parameters of two or three single tuned filters, formulae are given to calculate the parameter for double-tuned filter and triple-tuned filter. At last performance calculation and rating calculation are made to verify the design of AC filters can meet HVDC transmission projects' require. An example of designing a triple-tuned filter is offered. The impedance frequency characteristics of the three single tuned filters and the triple tuned filter are compared to show that the difference between them can meet the requirement of projects. Another way of two and three tuned filter design, which is based on the analysis of circuits and impedance frequency characteristics of AC filters is introduced. Two methods are compared to show both the advantage and the disadvantage of them.