Abstract：LCL filter are commonly used for VSC(Voltage source converter) to filter high- frequency harmonic components which are generated by VSC valves. But resonance of the primary system might occur and response characteristics of converter’s controller at resonant frequency might change. The switching frequency of high-voltage large-capacity converter is low and parameter design method of filter is complicated. Aiming at harmonic filtering and resonance suppression, impedance- frequency characteristics of the primary system and system voltage transfer function for VSC based on LCL are researched. Parameter design method of LCL-filter is obtained. Based on feedback of current at valve side, control system model of current regulation loop is established and the open loop and close loop control response characteristics are analyzed. For suppressing system instability and harmonic gain at resonance frequency, design method of cutoff frequency for the sampling feedback link is researched. Simulation model of VSC based on LCL and its scaling down experimental system are established, and simulation and experimental results prove rationality of parameter design method for LCL filter and resonance suppression method.
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2014, Vol. 29 
