Distribution Network Optimization Run

Distribution power networks are important parts of electric power systems. The configurations and operation conditions of distribution power networks are getting more and more complicated with the rapid developments of modern power systems. Distribution power networks face with most of the power consumers directly. They consist of numerous power equipments and distribute around. In addition, the power system real loss is mainly caused by distribution power network. As a result, it is in great necessity for us to study effective optimal operation methods for them. The study is very important for electric power system economic operation.Load flow calculation is the basis of distribution power network analysis. By comparison with transmission power systems, distribution power networks are of their own specialties in the configurations and parameters. For instant, there are great number of busses in the 6~10kV middle voltage distribution power networks. There are no measuring meters on most of the busses and there is no way to obtain the bus load data in most cases. Therefore the traditional load flow calculation methods will fail to solve the distribution power networks. To compensate the defects, a new concise method is proposed to determine the current distributions in distribution power networks. In addition, the new method makes it easy to calculate theoretically the real power loss in a distribution power network. The distribution power transformer planning is discussed, especially in the selections of the place where a transformer will be installed, and of the transformer typies. The method is presented to allocate total network load to individual transformers and to determine combination optimal operation modes of parallel connected power transformers. Regarding reactive power optimization, the optimal installation places are discussed for reactive power compensation equipments. The rule for the determination of the optimal installation places is put forward with the consideration of reactive load changes. The method for reactive power optimal compensation based on the optimal incremental active loss is investigated in details. The impact of reactive power compensation on network voltages is discussed in the following. The method for optimal voltage control in distribution power networks is proposed. At last, simulations of practical power networks are performed. The results show that the proposed methods are correct and effective.