Existing stability maintenance and regulation methods fail to effectively compensate for the nonlinearity， uncertainty， and other characteristics of grid-connected photovoltaic （PV） energy-saving power generation. This leads to overshoot phenomena during power grid voltage regulation， which impairs the power generation quality of the grid. To address this issue， this paper designs a stability maintenance and regulation method for grid-connected PV energy-saving power generation based on voltage orientation. First， according to the working principle of the grid-connected PV system， an equivalent circuit and a mathematical model of the PV cell are established to analyze the relationship between the output voltage and current. Second， the inverter and capacitor are controlled based on voltage orientation to obtain the regulation process. The connection position is designed according to the relationship between the DC-side voltage and output power， so as to ensure voltage stability during the operation of the power grid. Experimental results show that the three-phase voltage in the case study of the designed regulation method has no overshoot points and all values are within the allowable range， with a relatively high PV accommodation rate.