| Optimal planning of reactive power compensation is of great significance in planning design of electric power system. In this paper, the optimal planning of reactive power compensation with tree shape electric power system is discussed.Distributed generation (DG) is a renewable energy, with the advantages in energy-saving and emission-reduction, DG has broad prospects for development. In this paper, we analyze the DG and the impact which it brings to the reactive power compensation of distribution network. At the same time, try to find an effective application of reactive power compensation to the distribution network with DG, with a view to reduce the power loss of distribution network.The mathematical model of optimal planning reactive power compensation for 10kv distribution power system is been established in this paper. In the objective function, the sum of active power lose cost and new adding VAR equipment investment which has been divided in each year are considered, and reactive power balance, satisfaction voltage quality are the constraints conditions. So, the optimal planning result can ensure good qualities and economical benefits of electric energy. In the model considers three kinds of different load operation conditions-light, normal and heavy are considered. This makes the model more comply with the actual situation and avoid the one-sidedness of single load operation condition.For sending back reactive power of 10kV distribution network,new capacity and equipment investment costs only take into account the minimum load operation mode. This paper used PSO to console this model. PSO has a high efficiency and a simple model to solve optimize problem.The results of two testing systems of distribution network with DG that the method proposed in this paper can solve the problem of reactive power compensation of distribution network efficiently, and the method has better convergent performance and can get better result. |
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