浅析用于变换器的高阶并网滤波器

Analysis of the high-order grid-connected filter for the gird-connected converter

本文首先分析了LCL型并网滤波器,给出了相应的参数设计步骤,并通过Matlab仿真得到网侧电感与机侧电感比值对滤波电容容值选取的影响,以及该比值对纹波电流分流的影响,同时分析了有源阻尼策略在LCL型滤波器中的应用;然后,又在LCL基础上对分裂电容型高阶滤波器做了详细分析,得到两个分裂电容比例对整体滤波性能的影响,同时提供了应用该类型滤波器的无功补偿器试验波形;最后,在分裂电容型高阶滤波器基础上增加LC陷波器支路,并分析得到阻尼电阻对滤波器整体性能的影响,同时提供了应用该类型滤波器的无功补偿器试验波形。

This paper analyses the LCL-type grid-connected filter firstly.It gives proper designing steps.Through Matlab simulation,we get the affection of the ratio of the grid side inductor and the converter side inductor to the filter capacitor value and the cripple current.Simultaneously it analyses the application of the active damping control strategy into the LCL-type grid-connected filter.Then it analyses the splitting capacitor-type high order filter in detail.We get the affection of the splitting capacitor values to the filter performances,and the experimental waveforms using this type high-order filter into the static var generator.Finally basing on the splitting capacitor-type high order filter,it adds a LC trap branch,and analyses the affection of the damping resistor to the filter performances.We also get the experimental waveform using this type high-order filter into the static var generator.