Voltage Control Strategy of Distribution Network with Distributed Photovoltaic Based on Optimization Search Strategy

The widespread adoption of distributed solar photovoltaic technology has enabled distribution networks to manage the voltage levels at critical nodes through precise control of the reactive power supplied to the grid. This study has developed an adaptive voltage control scheme specifically designed for distribution networks integrated with large-scale photovoltaic resources. The scheme employs an advanced optimization search algorithm to automatically adjust the PI parameters of the voltage controller, ensuring flexible adaptation to real-time system fluctuations. The PI gain of the voltage controller minimizes the cost function that reflects the performance of the voltage controller through online updating. A distribution network model containing a 5MW PV system is constructed in MATLAB/Simulink to test the proposed self-adaptive voltage controller. The simulation results show that the proposed voltage controller can adapt well to load variations and grid faults, and improves the reliability and voltage stability of a power system, compared with the traditional PI controller.