500W Power System Of Solar Power And Commercial Power Complementary

The main content of the paper is the study of 500 W power system, explore a set of complete photovoltaic independent power supply system design method. To combine the status quo of power supply in Africa and other countries and regions, presents the design of solar power and commercial power complementary to charge and focuses on the method to realize the inverter system with 2switchable output voltages.This paper based on the complementary charging control system which based energy storage,expounds the development trend of solar photovoltaic power generation and the basic principle. The photovoltaic MPPT method is system analyzed, realize solar power and commercial power complementary to charge the battery by reasonable choice of charging strategy and control method.Research is mainly focused on the inverter technology as the core of door type with independent power supply system. Through the comparative analysis the advantages and disadvantages of several typical inverter systems’ topology structure and the control mode,determine use complementary PWM control’s high frequency push-pull booster and single-polarity SPWM control’s full bridge inverter structure to form main circuit topology. Use of high frequency transformer to switch between the 2 main winding in secondary, produce 2 different dc bus voltage and then to produce 2 different amplitude of power frequency ac voltage on the output side.First of the paper analysis and introduce the working principle of the push-pull and full bridge circuit structure in which the system adopts. In accordance with the drive control circuit and various protection circuits’ selection which based on is given, also the specific design process of related parameters. The pre-stage of DC-DC push-pull booster part use PWM controller SG3525 to produce 2 complementary PWM control signals. The post-stage of DC-AC full bridge inverter part use pure sine wave inverter controller IC TDS2285 to produce 4 channel SPWM control signals.Moreover, the inverter system has perfect protection measures including battery under voltage and up voltage protection, prevent polarity reversal protection, 2 stage over current protection, output overload and short circuit protection,overheating protection and so on.At last, a 500 W experimental prototype was built and experimental tested on the base of the theoretical analysis and parameter designation. With the analysis of the system’s PWM driving waveform and SPWM driving waveform also output voltage and spectral response in different power load. The results show that the design scheme of inverter system discussed in this paper is feasible which has a good reliability and stability and achieves the expected goals.