Research on Single-stage Cuk Inverter for Photovoltaic Power Generation

摘要

At present, the photovoltaic technology has been widely developed and applied, but the output voltage level of photovoltaic power generation system is still relatively low, and voltage range is wide. Therefore, the traditional bridge type inverter is can't meet the demand. This paper proposes an improved new Cuk photovoltaic inverter, the new inverter can boost pressure, the dc input voltage has the strong ability to adapt, and is suitable for photovoltaic power generation system. Firstly, this paper introduces the new Cuk photovoltaic inverter topology structure and working principle, and states control mode and working mode of the inverter. Then it analyzes the design of the system parameters. Finally, it uses Matlab/Simulink software to establish the system simulation model, adopts the voltage closed loop control strategy on the system simulation, and produced a test prototype. Simulation and prototype test results show that the improved new Cuk photovoltaic inverter can achieve the function of circuit booster, and is applicable to wide input voltage occasions. So it has important research significance.