Research On The Joint Operation Control Technology Of Small Power Photovoltaic Microgrid And Municipal Power Grid

Energy crisis and environmental pollution accelerate the research of renewable energy utilization.Solar energy is the most abundant and widely distributed resource in renewable energy family.Solar power generation is an important research direction of solar thermal conversion and utilization.Because of the great influence of solar light quality,how to ensure the stability and reliability of the load end is a key to photovoltaic utilization.On the premise of avoiding the reduction of efficiency and environmental pollution caused by the introduction of energy storage system,from the perspective of solving the priority of clean energy utilization,stable load power supply and not affecting the operation of large power grid,this paper proposes a joint operation power supply mode of small power photovoltaic micro grid and municipal power grid,and focuses on the analysis of the inverter in photovoltaic grid connected inverter system,and the grid connection and energy control strategy Some key researches were carried out.Firstly,this paper introduces the main circuit topology and working principle of single-phase photovoltaic grid connected inverter in detail,and then optimizes the hardware parameters of single-phase photovoltaic grid connected system.Based on the designed hardware topology,this paper analyzes the influence of different control strategies on the efficiency and control performance of photovoltaic inverter system,compares the common maximum power tracking control strategies of photovoltaic grid connected inverter,and optimizes the parameters of maximum power point tracking algorithm based on interference tracking method.To solve the problem that the traditional proportional complex integral control can not be applied to single-phase coordinate system,the generalized second-order proportional complex integral control is introduced into the control of single-phase grid connected inverter,and a compound control strategy is formedwith the grid voltage feed-forward control and repetitive control,which has a better control effect on the energy control of small power photovoltaic micro grid and municipal grid joint operation power supply.Finally,the simulation and experiment are carried out on MATLAB / Simulink and TMS320F28335 DSP platform.The experimental results verify the rationality and effectiveness of the composite control strategy.