Research Of Grid-connected Solar Photovoltaic Power System And Its Control Method

At present, in pursuit of low-carbon society, as a clean, renewable energy, Solar energy are experiencing the historical stage by supplementary energy to alternative energy development. Due to the rapid development of power electronics technology, as an important form of the utilization of solar energy, the development of the photovoltaic power generation situation is very rapidly. As the core components of the photovoltaic, the development of the key technologies of the grid-connected inverter, can greatly improve the efficiency of photovoltaic. Because of the later research, so it has the broad application prospects for the Grid-connected PV system.This article is based on10KW power generation system, conduct research on the solar three-phase photovoltaic grid-connected system and its control method. This topic is the use of intelligent power control algorithm, to achieve the maximum power output of solar panels, to ensure that the photovoltaic array to maximize the light energy into electricity, improve the system efficiency; This topic is the use of intelligent power control algorithm, to achieve the maximum power output of solar panels, to ensure that the photovoltaic array to maximize the light energy into electricity, improve the system efficiency; And use the direct power control technology to control the grid-connected inverter to meet the dynamic response and steady state control accuracy, ensure the grid-connected inverter to running its unit power. In the choice of the main circuit of inverter link, select the main circuit structure of a pre-high-frequency isolated Cuk converter, making the PV array output DC voltage can work in the best condition stability.In connection with the operating characteristics for grid-connected PV, this article based on theoretical analysis, we are studying simulation which including the solar photovoltaic cells, the maximum power point tracking control, solar photovoltaic systems, specifically, we get the simulation and experimental studies for the inverter control output link, provide a hardware circuit and the main program flow. The analysis of the simulation and experimental results show that the designed solar photovoltaic inverter output current can be guaranteed the unity power factor operation and in phase with the grid voltage, both in theory and experiment, and can succeed in the grid.