Reliability analysis of the usual loop network structure for regional power supply systems based on state space method
In this paper, a regional power supply system is taken as a radial system with redundancy reservation and a spinning reserve system. Reservation types are defined and described. Furthermore, a new reliability analysis method for the simple loop network structure of the regional power supply system is developed. The reliability analysis model for a simple loop network's power supply system is built up based on the state-space analysis technique by considering failure and repair rates of wires. In the proposed model, through drawing the state transfer chart of the redundancy reservation system, the corresponding transfer density matrix and linear equation group are put forward, and the solution of placidity state probability is obtained. The power supply unreliability degree and reliability degree of the substation and the average time of the power supply lines in all different states are calculated. The conclusion is extended to state of the complex loop network. It is the first time that the state space method is applied to the power supply reliability evaluation of the regional power supply systems with higher calculation accuracy. The effectiveness of the proposed method is verified by an example.