Based On The PSO PV MPPT Control System Research Under The Complex Environment

In recent years, Solar energy is replacing traditional energy as a renewable clean energy gradually.lt will become the main method to solve Energy shortage and environmental pollution problems fully in the future. Building-integrated PV integration and centralized power generation are an important part of the solar power. As the temperature, solar irradiance changing quickly, shaded by neighboring buildings and public facilities, the solar cell output characteristics present more peak or erratic characteristics of maximum power point.Under the above mentioned situation, the traditional MPPT control method is in failure. It is of great significance to improve the efficiency of photovoltaic power generation that Researching photovoltaic maximum power point tracking (MPPT) method under the complex environment.A photovoltaic cell simulation mode is established accoding to the principle of photovoltaic power generation. For different solar irradiance, different temperature and shadow, photovoltaic cells output characteristics is analyzed in detail. The MPPT of photovoltaic power generation system structure and the control principle are given.For the traditional MPPT algorithm is easy to fall into the direction error judgment and the local maximum point under complex conditions, PSO algorithm is introduced into the MPPT control system, the simulation results show that the PSO algorithm is effective, and the traditional PSO algorithm is improved. In order to improve the control performance, the improved method can adapt to adjust the search range of maximum power point voltage by a linear adjustment factor. In addition, the direct duty ratio group MPPT control method of multiple PV arrays is studied to further reduce the system costand the device size on the basis of the basic PSO.In order to verify the effectiveness of the improved PSO algorithm, the MPPT control of single-stage three-phase grid photovoltaic system is established and MPPT control system of multiple PV arrays for the Boost circuit is bulided up. Moreover DSP program of the improved PSO algorithm and PWM are designed. The simulation and experimental test results show that the improved PSO algorithm can be applied to PV MPPT of the solar irradiance, temperature to change quickly in the shade environment. Compared with the basic PSO algorithm, the MPPT algorithm shorten the dynamic response time, reduced the system oscillation effectively, and improve the conversion efficiency of PV energy. MPPT control method with multiple PV arrays has a good performance, and reduce the cost and size of MPPT control device effectively.