电流型多重化光伏并网逆变器的研究

Research on Current Source Multiple Photovoltaic Grid-Connected Inverter

在光伏发电系统光伏逆变器的研究中,针对太阳能电池的电流源特性,在光伏发电系统中采用电流型逆变器可以获得良好的控制效果。为了适应大功率的应用场合,以电流型多重化逆变器为研究对象,论述了电流型逆变器多重叠加的原理,并采用移相控制的方法对输出电流的进行调节。在上述基础上,研究了整个系统的控制策略。最后在MATLAB/SIMULINK环境下进行了系统的建模与仿真,通过FFT分析了并网电流,仿真结果证明了改进控制方法的可行性,为大功率光伏并网逆变器的研究奠定了基础。

Photovoltaic inverter is the core of PV system. The application of current source inverter to the PV system can get good control effect for the current source characteristic of solar cell. In order to adapt to the lager scale fields,this paper describes the principle of multiple superposition technology based on current source multiple superposition inverter. The output current is regulated by phase-shifted method. Then,the control strategy of the system is researched. Finally,the simulation model is set up in MATLAB / SIMULINK environment,the grid-connected current is analysised by FFT and the feasibility of the method is verified.