三调谐电力滤波器的研究

在分析单调谐滤波器和双调谐滤波器特性的基础上，提出了一种等效于三组单调谐滤波器的三调谐滤波器，该滤波器由3个电感和3个电容组成；分析了该滤波器的阻抗特性，给出了参数的计算方法, 通过额定电压、调谐频率、并联谐振频率和补偿容量等已知数据计算出电感和电容元件的参数；并针对一110kV实际电网，完成三调谐滤波器设计计算、仿真分析和试验测试。结果表明该滤波器有良好的滤波性能，可以同时滤除三种不同频率的谐波，频率误差不超过2Hz，性能优于三组单调谐滤波器，具有基波损耗低、占地小、投资省、只有一个电抗器接受冲击电压、只需要一个开关等优点，适合在电力系统推广应用。

A Novel Three Tuned Filter for Power System

With the characteristics of traditional single tuned filter and double tuned filter analyzed,a novel three-tuned filter for power system is proposed.The filter is equivalent to three single tuned filters.It is constructed with three capacitors and three conductors.Its impedance and frequency curve are also analyzed.Algorithm for determining the filter's parameters is presented.The inductances and the capacitances can be calculated from the given data such as rated voltage,tuned frequencies,parallel resonant frequency and reactive compensation capacity.A three-tuned filter for a 110kV power grid is designed,simulated and tested.The results show that the filter can filter three different given frequency harmonics,the frequency error is no more than 2Hz, and the filter has better performance than that of three single-tuned filters in filtering harmonics,lower power loss, lower space,lower price,only one reactor subjected to power line-voltage and one switchgear needed.The novel three-tuned filter will be implemented on the power system in China.