Research On The Coordinated Planning Method Considering Controllable Distributed Generation, Battery Swapping Station And Controllable Switches In Distribution Networks

The use of DG(Distributed Generation, DG) and promotion of electric vehicles can effectively alleviate the depletion of non-renewable energy, improve the environment. DG and BSS(Battery Swapping Station, BSS) large-scale access to the distribution network has brought new challenges to the planning of distribution network. How to optimize the DG, BSS and the switches of distribution network, at the same time, fulfill the need of Electric Vehicle users and ensure the economy and reliability of power distribution network is the key question to be solved for power distribution network which has DG and BSS. Existing research are mainly concerned about the plan and reliability of distribution network connected with DG, not the BSS. For this purpose, this paper focus on the research of planning distribution network with DG and BSS, the main content and achievement are as followed:Introduce BSS into the island formation strategy with DG. Propose the island formation strategy and the calculation method of island formation probability with DG and BSS. Propose the method to assess the reliability of power distribution network with DG, BSS and section switch. Based on this, propose the method to assess the reliability of power distribution network with controllable DG, BSS, section switches and tie lines considering distribution network tie lines load transfer effect.Build the Source-Load-Network coordinated plan model of controllable DG, BSS and distribution network switch. Add BSS running limit, the object of BSS profit and the investment running cost. Fix the distribution network annual energy not supplied object by considering the influence of BSS connection. Accordingly, build the Source-LoadNetwork coordinated planning model of controllable DG, BSS and distribution network section switch. The plan target and its investment cost object of distribution network tie line has been added to the model. The limit of distribution network and BSS reliability is considered at the same time.The Source-Load-Network coordinated planning model has Nonlinear Mixed Integer Programming features. Because of this, the hybrid intelligent algorithm for solving the model built by this paper has been proposed. Turn the original plan problem into discrete variable sub optimization problem whose discrete decision variables are switch position, controllable DG and BSS position and capacity; continuous variable sub optimization problem whose continuous decision variables is controllable DG power and continuous variable sub optimization problem whose continuous decision variables is BSS power. Use MOGA to solve discrete variable sub optimization problem. Use linear programming and quadratic programming respectively to solve the two continuous variable sub optimization problems. When solving the specific problem, for every iteration, first use the genetic algorithm to determine the discrete decision variables of random individuals. Then use linear programming and quadratic programming respectively to determine the continuous variables of random individuals. At last, do the reliability assess and fitness calculation. Finally, verified the correctness of model and algorithm in this paper by using the IEEE 3 feeder distribution system.