A low-voltage distributed photovoltaic flexible control technology is developed based on the basic principle of minimizing solar energy loss and maximizing the output of photovoltaic power sources. It achieves flexible management of distributed power supply voltage based on the voltage deviation method at the grid-connected point of distributed photovoltaics. Combined with the three operational states of the distribution network—normal, warning, and emergency—it designs flexible control strategies and control processes for distributed power sources that are suitable for different grid operating states. At the same time, field pilot verification was conducted in collaboration with distributed photovoltaic pilot users. The verification results show that the impact of distributed photovoltaic grid connection on the power grid has been alleviated after flexible control, and voltage fluctuations, frequency, daily average power, and daily power generation have also been significantly improved.