一种新型开关模式的高增益低谐波三相逆变器

A New Switching Mode High-Gain and Low-Harmonic Three-Phase Inverter

直流电压利用率和输出电压谐波是影响逆变器性能的重要指标,为提升逆变器的这两项性能,提出一种新型开关模式的三相逆变器,通过把交流侧滤波电路整合到Buck电路中,使交流输出侧不需要电感电容等无源滤波元件,没有直通和反向恢复问题。该逆变器每一相只有一个开关工作在高频状态,其余开关工作在50 Hz的低频软开关状态。并引入了准比例谐振(PR)控制策略,通过控制变量法详细分析了其控制参数对系统性能的影响,且给出了一组合理的控制参数。最后,在Matlab/Simulink中搭建了该系统仿真模型,仿真结果表明,应用该新型开关模式的三相逆变器能显著提高逆变器的直流电压利用率,改善输出电压波形。

DC voltage utilization and output voltage harmonics are important indicators that affect the performance of an inverter.In view of an improvement of these two performances of the inverter,a new switching mode three-phase inverter,which integrates the AC side filter circuit in the Buck circuit,has thus been proposed.Free from the requirement of such passive filter components as inductors and capacitors,the AC output is characterized with no direct through and reverse recovery problems.With only one switch in each phase of the inverter working in the high frequency state,the other switche work in the low frequency soft switching state of 50 Hz.After the introduction of the quasi proportional resonance(PR)control strategy,a detailed analysis has been made of the influence of control parameters on the system performance through the control variable method,with a group of reasonable control parameters given.Finally,the simulation model of the system is to be built in Matlab/Simulink.The simulation results show that the three-phase inverter with the new switching mode can significantly improve the DC voltage utilization and output voltage waveform of the inverter.