Joint Control Strategy Study of Active Power and Voltage in Regional Power Network Considering Energy Storage

Because of the intermittent and fluctuation of the distributed renewable power generation, the power fluctuation and voltage fluctuation of the distribution network are serious. In order to solve this problem, a joint control strategy considering energy storage equipment is proposed in this paper. Firstly, the mathematic model with the minimum power fluctuation as the objective function is established, and then the particle swarm optimizer is used to control the energy output, which makes the distribution network power fluctuations minimum. Through the feedback control strategy of charge state for energy storage system, the energy storage equipment will not be excessively charged and discharged. Because the power flow calculation is used to obtain the voltage fluctuation on the access bus of the wind power, the periods that voltage fluctuates greatly are selected. And discrete reactive power compensation is carried out on the bus to further adjust the voltage fluctuation. Finally, the IEEE14-bus distribution network is taken as case, in which the wind power and an energy storage device are connected to the distribution network, and the discrete reactive power compensation equipment is arranged on the access bus of the wind power. In addition, power fluctuations and voltage fluctuations are compared in the case of no storage output or no discrete reactive power compensation in one scheduling period, which shows the validity of joint control strategy.