Abstract: This paper proposes a Non-MPPT algorithm suitable for regional rooftop photovoltaic power generation system to solve the problem of excess capacity of PV power generation system, based on the environmental adaptive algorithm of two-stage photovoltaic power generation system and the distributed structure of photovoltaic array. In the normal conditions, the shading PV module can realize the decentralized control based on the distributed pre-optimizer of PV module. And through the PV module output voltage and current random variables, the PV battery environmental correction parameters are derived, and the maximum power voltage of the regional PV module is corrected in real time, so that the maximum power voltage follows the external environment changes in real time, and combined with the conductance increment method to achieve PV array global maximum power tracking in different environments. If the output of photovoltaic power supply of the power grid is excessive, the regional roof PV will be managed according to its actual power output. Through the power distribution amount of the regional power grid, the output voltage of the rooftop PV array can be derived. And the derived voltage will be introduced into the front stage Boost circuit of the photovoltaic power generation system. Then, by modifying the duty ratio of the boost circuit, the output power of the photovoltaic power generation system can quickly follow the demand instruction of the main network, so as to realize the consumption of excess output of rooftop PV in the region. Finally, a two-stage three-phase photovoltaic grid-connected system is built by Matlab/Simulation to verify the effectiveness of the algorithm in the applications of power system.

Key words: PV power generation, environmental adaptive algorithm, Non-MPPT algorithm, regionalized management, regionalized management