Research Of The Architecture Of Small Solar DC Power Supply System

The solar photovoltaic generation as a clean energy, which is widely used as it’s most simplest and mature technology in new energy development. Currently, the research for solar PV mainly was focused on the field of medium and large scale solar power generation. But for the vast underdeveloped areas, the research of common miniwatt solar PV system intensively are not many applications. For such situations, how to improve the photovoltaic conversion efficiency of miniwatt solar and design reasonable charge and discharge control system will have important implications for the study of photovoltaic power generation.The thesis mainly completes the works below:(1) Study several traditional maximum power point(MPPT) control methods, and then put forward a MPPT control system possessing wide temperature compensation and constant voltage. By the combination of software and hardware on the basis of this method, it will achieve a maximum power output of the PV array.(2) It is proposed that miniwatt solar PV system architecture has the remote control function, which includes the real-time monitoring outer circumstance temperature, the battery changed of storage battery and GSM remote communication and control system. For three-stage battery charge and over-discharge protection requirements, the charged and discharged circuit protection board will be designed. The output voltage of the battery will make DC-DC step-down design for the outside. Finally, the rationality of the control system is verified by the hardware design, which is based on the simulation.(3) The DC-AC converter circuit is designed to ensure that the power of the battery of solar architecture can be applied in AC. Firstly, it is verified by the MATLAB simulation software that the inverter control has the advantage of feasibility in single-phase full-bridge inverter circuit. Then the inverter circuit is designed based on switching tubes and the DSP with master chip of TMS320LF2407 A, and the test results show the AC output.(4) For the conversion circuit of the reduction voltage(Buck) on the PV system, dwarf signal modeling is modeled by state-space average method. PID parameters adjust the amplitude and frequency margin, phase margin and overshoot to obtain stable output in control system.