阻基波滤波器对12脉波整流机组、电能质量的改善

大功率整流装置在城市轨道交通供电系统中广泛运用,其产生的谐波会对公共电网以及城轨牵引供电系统造成危害.24脉波整流机组网侧、直流侧谐波含量比12脉波整流机组少很多,但设备成本高.如果采用在12脉波整流机组网侧与直流侧分别连接滤波器的方法,能取得24脉波整流机组相近的效果,会节省大量的投资.分析了12、24脉波整流机组工作原理,24脉波谐波相消及滤波器设计原理.利用MATLAB/Simulink搭建24脉波整流机组和网侧、直流侧分别添加阻基波滤波器和单调谐滤波器的12脉波整流机组仿真模型,并对电流谐波进行傅里叶级数分析.结果表明,改善后的12脉波整流机组有效地减少了网侧、直流侧谐波含量,达到了24脉波整流机组相近的消谐效果,对城市轨道交通牵引供电系统具有重要的参考意义.

Improvement of power quality of 12 pulse rectifier unit by using filter to prevent fundamental wave

With the extensive use of the high-power rectifier devices in power supply system of urban rail transit,harmonic generated by these devices will do harm to the public grid and traction power supply system for city rail transportation.Compared with 12-pulse rectifier unit,current harmonic content of network side and the DC side of 24-pulse rectifier unit are greatly reduced.However,its equipment cost is very high.If respectively adding the filter into network side and the DC side of the12-pulse rectifier unit,the method can reach the similar effect compared with 24-pulse rectifier and save investment.This paper analyzes the working principle of 12-pulse and 24-pulse rectifier unit,current harmonic elimination and the design of filter.Taking advantage of Simulink tool in MATLAB,the simulation model of 24-pulse rectifier unit and 12-pulse rectifier unit with the filter to prevent fundamental wave and single-tuned filter were established.According to the Fourier series analysis of current harmonics,the result shows that the improved 12-pulse rectifier effectively reduces the current harmonic,reaching the similar effect of eliminating harmonic compared with 24-pulse rectifier.This method has an important reference for power supply system in urban rail transit.