Planning Of Distributed Wind Gerneration In Distribution Network

As the limitation of traditional grid transmission mode becoming highlight, energy crisis and energy pollution gradually approach. Distributed generation technology have widely got government’s attention with its unique little pollution, high energy efficitency and high reliability. Distributed wind generation as a clean, renewable energy, its permeability in distribution network have gradually increased. An appropriately planning of distributed wind generation is very important for reliable, safety and economic operation of distribution network.In this paper, the planning of distributed wind generation in distribution network were studied, and mainly around the following three points:(1) Establishing a suitable distribution network power flow calculation model; (2) Research on sitting and sizing of distributed gerneration; (3) Optimal allocation of distributed wind generation under the tendency of active distribution network.As described above, this paper firstly proposed a probability distribution network load flow calculation methods base on 2n+1 point estimation method and Gram-Charlier expansion, which can regarding the uncertainty of distributed wind generation and load foreacast. Secondly, the sitting and sizing of distributed generation which not given the distributed generation candidate site is studied, this paper proposed a two-stage optimization planning method:In first stage, an approximate model based on weight coefficient is established to achieve a search space reduction. Then a set of candidate site of DG obtained by tackle this model through active set method. In second stage, this paper puts forward a dynamic chaotic particle swarm optimization algorithm to solve the sizing problem for candidate node, and the optimal value returns to the first stage, and finally DG’s optimal site and size is determined. Finally, this paper briefly discusses the planning characteristics of active distribution network, and studied the reactive regulating capability of doubly-fed induction wind turbine.A bilevel programming model was proposed to solve the optimal allocation of distributed wind generation in active distribution network.the upper level model planning the siting and sizing of distributed wind generation, the lower level model simulates the dynamic reactive power optimization of distribution network.the model embedded chance constrained programming based on probability power flow calculation,and a hybrid PSO/TS algorithm was applied for solving this bilevel model.The simulation results show that take full use of the flexibility of distributed wind reactive power regulation in active distribution network planning can reduce the waste, and get maximize benefits in investment and operation.All methods or models this paper proposed were designed and implemented with MATLAB, and using IEEE classic example for simulation to verify the feasibility and effectiveness of the methods and models.