Optimization of Control Strategy for Photovoltaic Power Generation System in Weak Grid

Abstract

With the continuous use of traditional fossil energy, the energy crisis and environmental pollution problems become increasingly obvious. As a recyclable, renewable and pollution-free clean energy, solar energy has received more and more social attention. Photovoltaic power generation has become one of the main forms of solar energy utilization for its convenience, safety and other advantages. This paper presents a control method to achieve maximum output efficiency tracking, guaranteeing the output current quality of photovoltaic cells. The design of photovoltaic power generation system and the setting of control parameters are often based on ideal conditions. However, in the real process such as long distance transmission, a large number of line impedances will inevitably be introduced into the power grid, which will lead to the increase of harmonic content of grid connected current and the generation of spike resonance among parameters. Under the combined action of non-linear load and line impedance, how to improve the system stability and reduce the negative impact on the inverted grid connected system has become a problem to be solved. This paper presents an impedance reconfiguration method to increase the stability of photovoltaic power generation system in weak grid.