Research On Solar Photovoltaic Array Simulator

With the solar photovoltaic power generation technology becoming matures, more and more solar PV grid-connected inverter has been researched and produced. If the actual solar panels DC output is taken as the input of the inverter, the different solar PV curve can not be able to be simulated due to the difficulties in change the light intensity and temperature. Therefore, the development cycle of the inverter has suffered lots of restrictions.The development of solar photovoltaic array simulator successfully solved the above problem. the simulator can simulate the DC output of the PV array with any light intensity and temperature in accordance with the specific requirements of the PV curve for debugging the inverter. The DC output of the single or multiple PV curve in different conditions can be simulated in a short time by the simulator which means a great convenience to the debugging of the inverter.With the high-frequency trend of photovoltaic grid-connected inverter, the inverter power level has been greatly improved. The design of PV array simulator as a front-end input device requires that the switching frequency should be increased continuously. It is demand that developed the new simulator topology base on soft-switching technology while maintaining the original power level. A new application of a secondary side using simple auxiliary circuit and zero voltage zero current shift phase full-bridge converter in the simulator can solve that problem above. In that circuit, the leading-leg turns-on with zero voltage, the lagging-leg turns-off with zero current. This could increase the switching frequency while reducing the switching loss and also greatly improved the efficiency of the simulator.Being introduced in the PV array simulator, the soft-switching technology should be cooperation with the proper parameters of each component in that circuit. Only in that way, the circuit can work in a normal condition and achieve the soft-switching. The precise parameters calculation of the main inductor, capacitance, the resonance and the isolation transformer will help to achieve a stable operation of the soft-switching resonant circuit. In this paper, all the parameters of the various components of the soft-switching full-bridge circuit were calculated, and the components pattern of the solar PV array simulator device were also determinedThe simulation can not only verify the correctness of each component selected in the soft-switching circuit, but also tested the choice of the control strategy. All this can help to analyze the deficiency of the control and provide a reference for specific experimental debugging. In this paper, a simulation model of the solar PV array simulator was built, and some preliminary researches on solar photovoltaic array simulator based on soft-switching control system and the corresponding control method were both done.