Low Voltage Compensation in Distribution Grid with Sparrow Search Algorithm

This paper proposes a new method based on sparrow search algorithm (SSA) to compensate low voltage in distribution grid. A compensation device which is composed by a battery bank and inverter connected to grid at the load side is used. The load voltage is compensated by injections of active current and reactive current from the device. To have battery discharge time as long as possible, an improved SSA is designed to obtain the largest reactive current and the smallest active current injection when the load voltage is compensated. In order to make the search of sparrows more detailed and obtain better positions, inspired by the rotation operation of the whale algorithm, a spiral search strategy was introduced in the discoverer stage, balancing the global and local search of the algorithm. The new method is tested on Matlab/Simulink with real grid parameters and the results show that the active current injection is minimized, which can increase the battery discharging time significantly.