Reactive Power/Voltage Control Strategy Of The Active Distribution Network Based On The Sensitivity

With high permeability distributed energy resource (DER) access, the active distribution network(ADN) is the inevitable trend of the smart grid development, and the reactive power/voltage control and optimization is a hot direction of intelligent distribution network research. In the framework of ADN, DER take part in operation and control of the intelligent distribution network, is no longer passively given as the traditional distribution network. DG, controllable load, energy storage unit will cooperate with the traditional regulation way scuh as capacitor and transformer on grid optimization scheduling, maintain the stability, safe and economic operation of the power grid. In order to solve the impact on the stability and economy of power grid with the high permeability DER access, in this paper, we study the coordination between different DER as well as between DER and conventional regulation way. We determine a optimization control strategy to guide optimization distribution of the system trends, so that we can stable system voltage and reduce the network loss. This article focuses on the voltage/network loss optimization of AND, the main contributions are as follows. The guiding role of sensitivity is of great significance in the efficiency of DG and the reasonable distribution of the network reactive power.(1) To detailed analysis the interaction mechanism between different control mode, this paper adopted the method of sensitivity through the calculation of sensitivity matrix of each node, so that we can study the impact of the node voltage and the network loss which cause by the control measures such as DG, capacitors, transformers,etc. Also, we studied the interaction between various control methods.(2) This article puts forward the ADN reactive power/voltage control strategy with multi-type adjustment methods participated. Strategy studied the in the output model of photovoltaic, fuel cell and wind power. We join the punishment factor according to the their control mechanism so that we can manage how to coordinate different ways of regulating way. Strategy is guided by sensitivity to coordinate the controllable unit for reactive power optimization of distribution network. In the category of sensitivity, this paper joined the weighting factor to coordinate voltage sensitivity and network loss sensitivity, which solve how to unify different dimension between voltage and network loss so that we can guide the priority optimization between voltage and network loss in different condition.(3) Improve the control strategy and campare it with the intelligent optimization algorithm in order to improve the efficiency of the strategy and convergence results. According to the voltage sensitivity and network loss sensitivity, the quantitative calculation methods of control variables is given. We give the penalty factor to coordinate different types of control way according to the reactive power regulation efficiency. What’s more, we quantitative the weight factor to coordinate voltage sensitivity and network loss sensitivity according to the results of simulation experiment. Finally we present reactive power/voltage control strategy with fast convergence and better convergence result based on sensitivity method. By comparing with the intelligent optimization algorithm by the simulation example, the superiority and applicability of this control strategy is validated.