The paper has proposed a multi-point optimized access method of distributed generators aiming at peak shaving of feeder in distribution system. First of all, typical daily load curve of the feeder has been analyzed to get different peaking need of different seasons during operation. Based on this, multi-point optimized access model has been established, taking optimized peaking shaving effect and penetration of renewable energy as the objective, and taking no power returned and capacity limit as the constraint condition. Genetic algorithm has been used to solve the problem. The result shows that it is more refined to consider operation condition during the optimization. And the dual objectives can result in an optimized capacity interval for reference during project implementation.

The traditional protection of urban distribution network has series of shortcomings such as the difficulty of coordination between protections, the large scope of blackout area and a long time for fault removing. Considering above situation, the paper presents a logic protection of urban distribution network. Based the location in the distribution network, the switches are classified with which the protection action criterion is given. Combined with the actual characteristics of urban distribution network, the logic protection program is designed. The analysis of example verifies the effectiveness of the program.

The accession of diversification loads containing DG and electric vehicles charging stations into distribution network has an important impact on the distribution network planning and operation. This paper proposes a planning model of rural distribution network containing diversification loads, which can realize the integrated optimization planning including the location and sizing of DG, charging station location and capacity, distributed network frame construction and renovation. Taking the diversification loads into account, and selecting the minimum costs of investment, operation and environment as the objective, the paper establishes the planning model of rural distribution network containing diversification loads. The simulation results show the model can improve the economic and environmental benefits.

With the gradual development of the micro-grid construction, the problem of micro-grid optimal dispatch has become the key of depth application. Based on the operating characteristics of Distributed generation (DG) and load changes, the paper establishes an optimal dispatch model of Micro-grid. The model is solved by particle swarms optimization. At last the control strategy of micro-grid island operation and network operation is developed. The simulations of examples prove the effectiveness of the model.