一种改进型大功率集中式光伏并网逆变器研究

Research on an Improved High-power Centralized Photovoltaic Grid-connected Inverter

为了改善光伏发电系统的并网电能质量、有效提升逆变器工作效率,提出了一种改进型大功率集中式光伏并网逆变器,将光伏逆变器与有源电力滤波器(APF)的直流侧进行并联, APF的交流侧通过高频变压器接入主回路,并通过双绕组升压变压器并网。分析了改进型大功率并网逆变器的工作原理,建立了系统的控制模型,应用基于复合校正技术的三角波控制方式对主逆变器进行控制,系统仿真分析验证了装置的有效性。

In order to improve the grid-connected power quality of photovoltaic power generation system and the efficiency ofinverter, an improved high-power centralized photovoltaic grid-connected inverter is proposed. The photovoltaic inverter is con-nected in parallel with the DC side of the active power filter （APF）, and the AC side of the APF is connected to the maincircuit through a high-frequency transformer and connected through a double winding step-up transformer. The working princi-ple of the improved high-power grid-connected inverter is analyzed, the control model of the system is established, the trian-gular wave control method based on compound correction technology is applied to control the main inverter, and the effec-tiveness of the device is verified by system simulation analysis.