Power distribution system probability reliability assessing method based on analytical method

Abstract

The invention discloses a power distribution system probability reliability assessing method based on an analytical method. The method comprises the steps that a given power distribution network is partitioned into a fault area, an isolation area, a gapless island area and an influence-free area are classified, a fault mode impact analysis sheet base is established, and parameters are initialized; a stimulation clock is initialized, a random number is generated, the minimum non-failure operation time is obtained according to failure rate parameters of all element state models, the fault isolation time and the load band transferring time are worked out, and the stimulation clock is pushed; the fault mode impact analysis sheet base is inquired, classifications of all cells are determined, whether an island is formed or not is judged, and different methods are adopted for processing the island area and the non-island area; the state sample of an energy storage device is established according to the energy storage device electrical charge state probability distribution obtained through the probability reliability calculating method; distribution probabilities of single-time fault indexes of load points are overlapped, and the probability reliability indexes of the loads and the system are calculated. The simulation speed is increased while certain calculation precision is ensured, and the power grid situation is comprehensively reflected.

Description

technical field [0001] The invention relates to a probability reliability evaluation method of a power distribution system. In particular, it relates to a probabilistic reliability assessment method for power distribution systems with distributed power sources based on analytical methods. Background technique [0002] In the face of the development opportunities of energy technology innovation and energy system transformation, the awareness of energy security in modern society is gradually improving, and the reliability of power distribution systems has become the focus of power users; at the same time, the marginal cost relationship between the reliability of power distribution systems and investment should be improved. It directly affects the economic benefits of power companies and society. In addition, the fluctuation of the output of wind turbines, photovoltaics and other renewable distributed power sources and the impact of the operating characteristics of energy stora...

AI Technical Summary

Problems solved by technology

As a power component, the outage model of DG is more complex than the two-state model, so the access of DG will greatly increase the state scale of the distribution network, and the complexity and calculation amount of reliability analysis will increase accordingly.

Images