单相多模块电压源型逆变器

Single-Phase Multi-Cell Voltage Source Inverter

为实现低压直流到高压交流的变换,提出一种适用于低输入电压场合的单相多模块电压源型逆变器拓扑。产生同样大小的交流电压,电压源型逆变器(VSI)的直流侧电压仅需为传统H桥逆变器的1/3,因而更加适用于新能源发电系统和电池储能系统。介绍单相多模块VSI拓扑结构及工作原理,详细分析单极性PWM下电路运行特性,在此基础上完成电容器参数的设计,最后通过PSIM软件对该电路结构进行仿真,并搭建一个2k W的实验系统,对带有稳态负荷、阶跃负荷及感性负荷时的工作特性进行验证。仿真和实验结果表明,电容参数设计合理,提出的VSI具有较大的升压能力,并在阶跃负荷、感性负荷下依然具有良好的运行特性。

In order to realize power conversion from low DC voltage to high AC voltage, this paper presents a new breed of single-phase multi-cell voltage source inverter （VSI） topology suitable for low input voltage. This novel VSI can generate the desired AC voltage based on normally 1/3 of total DC voltage of traditional H-bridge inverters, which is more suitable for renewable generation systems and battery energy storage systems. The topology and operating principle of this new type of VSI were introduced, the circuit working characteristic was analyzed, and then the design method of capacitor was provided. In the end, a simulation model was built by the PSIM, and a 2kW hardware prototype was fabricated to test the performance characteristics of the topology with steady load, step load and inductive load. The simulation and experimental results verify that the designed capacitance parameter is proper, and this novel VSI has the step-up function and achieves good performance with step load and inductive load.