A non-isolated high-gain three-port DC-DC converter based on Y -source impedance network

To solve the problem of low voltage level and discontinuous power supply of photovoltaic power supply, a non-isolated high-gain three-port DC-DC converter based on Y-source impedance network is proposed in this paper. The proposed converter has continuous port current, which is more suitable for distributed power supply. The proposed converter can operate in four different operating modes. In this paper, the voltage gain of the converter is derived by analyzing the working principle in different modes. A control strategy is proposed to achieve the seamless switching between maximum power output and constant power output of photovoltaic power supply on the premise of maintaining constant output power, so as to ensure the maximum energy utilization efficiency. The simulation results prove the feasibility of the converter and control strategy.