单相光伏并网逆变器群控供电系统的建模与控制

Modeling and Control of Single Phase Photovoltaic Grid-connected Inverters Control System

分析了光伏并网逆变器群控系统中环流产生的机理,并导出了影响环流数值的因素。通过进一步分析找出逆变器输出的功率与环流之间的关系。在单台并网逆变器控制方法之上,设计出并网逆变器群控系统的环流抑制的方法,并对环流抑制方法的稳定性作了进一步分析。最后给出了并联控制系统仿真输出电流波形以及样机实验波形,并对理论分析、仿真波形以及实验结果进行比较。从仿真波形以及实验结果来看,所采取的控制措施是完全正确的。

Generating loop current mechanism of photovoltaic grid-connected inverters based on Group control system is analyzed and influent factors of loop current are also derived。Relationship between output power of the inverter and surround current is found by the further analysis. On the base of single grid-connected inverter control method,control system of circulating current restraining method with group control system. Stability of circulation inhibition method is analyzed further. Finally, the control system simulation result and experimental waveforms are given and the theoretical analysis, simulation and experimental results are compared。From the simulation and experiment results, the realizing method and control strategy are entirely correct。