Active and reactive power coordinated control strategy of battery energy storage system in active distribution network

Large penetration of intermittent renewable energy and complex loads in Active Distribution Network (ADN) has aggravated the fluctuation of voltage and increased power loss. Battery energy storage system (BESS) is a critical device in ADN, which are used to provide active power for the system. However, by connected with the grid using converter, battery has the ability to provide reactive power for the grid without other reactive compensation devices. To exploit the potential of BESS to regulate voltage fluctuations in ADN, in this paper, an active and reactive power coordinated optimization of BESS is proposed, with the goal of realizing lowest power loss as well as minimal voltage fluctuations in ADN. Then a specific solution to this optimal problem is given based on particle swarm algorithm. The results of a case study show that, by comparison between active power control strategy and active and reactive power coordinated control strategy, this paper has confirmed that the latter with reactive output of battery can have a better effect on reducing the power loss and stabilizing voltage fluctuation.