摘要
在Z源逆变器的光伏发电系统中,系统由直通状态到非直通状态转换时母线会产生寄生电压,增加了并网电能的谐波含量,严重影响了并网电能质量,同时增加了主回路损耗,降低了系统效率。针对此现象,在考虑杂散参数的基础上建立了Z源逆变器的等效模型。通过该模型的电路方程分析了母线寄生电压的产生机理及各杂散参数对母线寄生电压的影响规律,在此基础上,设计了一种母线寄生电压抑制电路。将其应用于1台基于Z源逆变器的光伏发电系统上,能够有效抑制Z源逆变器母线寄生电压,说明该方案具有可行性。
In the photovoltaic power generation system based on Zsource inverter, the parasitic voltage of busbar in Zsource inverter will occurrence when state of Zsource inverter change from the shootthrough state to nonshoot through state. That increases the loss of the main circuit, deereuses the system efficiency, and the harmonic content of the energy and may result in a serious impact on grid power quality. By considering stray parameters, an equivalent model of Zsource inverter was built. That analyzes generation mechanism of this phenomenon and the effects of stray parameters. Then, a damp method was designed to suppress the parasitic voltage of the busbar voltage, and the experiment is carried on the photovohaie power generation system based on Zsource inverter. Experimental results show that the technique can suppress the parasitic voltage of Zsouroe inverter effectively.
出处
《电气传动》
北大核心
2014年第2期19-21,共3页
Electric Drive
