三相四桥臂PCS的LCL型滤波器的设计

A Design of LCL Filter in 3-phase 4-leg PCS

PCS(Power Conversion System)是基于3D-SVPWM(三维空间矢量调制技术)技术的双向储能变流器,也是电池储能系统和整个微网系统中最重要的电力电子装置。由于变流器使用IGBT等高频开关器件,所以形成大量高次谐波信号,不论离网还是并网,都会严重影响电能质量。基于三相四桥臂拓扑模型,提出并设计了针对三相四桥臂的LCL(电感、电容和电感)型滤波器,有效地解决了PCS输出波形含有高次谐波的问题,并且通过参数优化减少了电感使用个数和系统的动态性能。通过Matlab中Simulink的仿真,验证了设计的正确性。

PCS （Power conversion system） is a bi-directional power conversion system based on 3D-SVPWM technology （3-D space vector pulse width modulation） and it is the most important power electronic devices in battery energy storage system and in the micro-grid system as well. Due to the use of high-frequency switching devices such as IGBT in the converter, a large number of high-order harmonic signals will be formed to affect the power quality seriously, regardless of off-grid or on-grid. Three-phase four-leg LCL （inductance, capacitance and inductance） filter was designed based on 3- phase 4-leg topology model that could solve effectively the problem i. e. PCS output waveform contains high order harmonics. The number of induetors in use may be reduced and the dynamic properties of the system may be improved via parameter optimization. The correctness of the design was demonstrated through simulation in Simulink of Matlab.