In view of the inaccuracy and completeness of the distribution network system diagram in the current power grid, the power network structure and the business characteristics of the power industry are investigated and analyzed. The relationship model between substations is analyzed, and the inheritance circuit layout design idea is applied to the distribution. In the grid system topology diagram. The paper proposes a method of dividing the power supply area according to the line contact relationship, and develops an equal density constrained space layout algorithm. Make full use of the distribution network geographic information (GIS) drawings, carry out the power grid topology and line information maintenance, so that the system diagram covers all electrical equipment on the GIS, and can carry out the original electrical topological relationship of the gemstones, and realize the absence of each subsystem. The seams provide image support for a variety of applications. The experimental results show that the proposed spatial topology algorithm is efficient and easy to implement.

The crisis of fossil fuel exhaustion and environmental pollution promotes the employment of distribution generators in distribution systems. The intermittent and random nature of distributed generators may bring threaten to the reliability and stability of the power grid. To improve the N-1 evaluation schema for distribution grid with DGs, an evaluation index system and comprehensive evaluation method for distribution system are proposed in this paper. Security, economy, quality and development coordination of system are analysed and used as the evaluation indexes. An evaluation framework is implemented with an analytic hierarchy process and a gray relational analysis method. The proposed index and framework were implemented tested with a modified distribution system on the CloudPSS platform. Multiple optimization objects of planning solutions for the distribution system were evaluated by the proposed frameworks. The best grid connection schema were generated based on the evaluation results. The test results demonstrate the feasibility of the proposed index system and framework.

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