Optimal Placement Of Distributed Generation Considering Voltage Stability

With the development of the power technology and the increasing load, and the expansion of the generation size, problems of the big electric network gradually emerge, such as the hard tracking of power system to the load's change, low system reliability, large loss of transmission system and distribution system, serious environment pollution. Distributed Generation (DG), which combined with the big electric network to supply electric power, is the one of way to reduce environmental pollution, track the load changes, expansion of power supply system capacity, improve reliability, and meet the development of renewable energy resource. Therefore, to develop distributed power generation is a new direction for the development of power industry.Several common distributed generation technologies are introduced in this paper, and emphasis on analysis of distributed generation on distribution network may access the impact and positive results. It discusses the DG influence on power loss and voltage profile considering three related factors:the interconnected location, injected capacity and power factor. The regulations show that the rational planning scheme for DG in the distribution network is of great significance for bringing the benefits of DG into full play and restraining the negative effects brought by DG. An optimal placement approach of distributed generation was proposed, in which the constraint conditions of voltage stability were considered. This approach aimed to minimize the cost for distributed company, to contribute to a distributed power supply constraints, and the penetration power ceiling for the constraints, the formation of non-linear optimization model. The new model also introduced the voltage stability condition in order to ensure the stability of the system is running. The heuristic approach was used to solve the optimization model to determine the optimal allocation and size of distributed generation.The proposed method is simulated and analyzed by using the 35 nodes distribution system. Simulation results show that the heuristic algorithm for solving mixed-integer nonlinear model is an effective way. Meanwhile, the proposed benefit-cost analysis of power distribution companies can provide useful investment DG economic signals. This model of distribution companies in the realization of economic operation also enhances the voltage stability of distribution networks. The model and method provide decision-makers with more flexible configuration schemes of DG, and have practical significance.