The issues of construction and analysis of the topological model in reliability analysis of main electric schemes connections in power plants and substations are considered in this article. The multi-matrix method for reliability analysis is proposed in this article for different electric schemes: two operating systems of built-up wires and one bypass system of built-up wires; two operating systems of built-up wires; one operating system of built-up wires and one bypass system of built-up wires by the obtaining multi-states. The main conclusions were made on the further direction of research.

Renewable energy sources becoming more widespread in decentralized power supply systems. However their functioning depends on the natural resources potential having variable character. This dependence influences reliable work of autonomous power supply system. Reliability analysis of a renewable energy based autonomous generating system is the actual practical task requiring the solution. For the reliability assessment of autonomous wind-diesel installation it is offered to use the method of dynamic fault tree with Markov models for representation of dynamic operators. The offered method is applied for reliability calculation of the wind-diesel installation functioning in the autonomous power supply system in the north of Krasnoyarsk region.

For power supply to isolated consumers, an autonomous power complex is used, consisting of photovoltaic converters, diesel generators and storage batteries. When planning the power complex, the fundamental task is to select the optimal structure of the elements of the generation system, which maximizes the use of the solar energy input to ensure the given consumer load. The article proposes a technique for optimizing a swarm of particles in relation to the problem of determining the composition and power of the elements of a solar-diesel generation system. On the example of the power supply system of the settlement of the Republic of Khakassia, the optimal structure of generating and storage facilities using solar energy has been determined. To assess the reliability indicators of the power complex, a probabilistic method has been proposed and implemented, which makes it possible to take into account the daily cyclicity and seasonal variability of the intensity of solar radiation

The study proposes a probabilistic method using triangular fuzzy numbers to analyze the reliability of the traction substation. With this approach, the reliability assessment of the traction substation can be performed considering changes in the values of reliability indicators of electrical equipment, determined on the basis of the fuzzy set theory

Entropy criteria of traction substations of 110–220 kV schemes’ unreliability are considered in this article in the conditions of indeterminacy of schemes’ conditions. It is shown how the application of entropy estimates during scheduling reconstruction of traction substations allows to estimate effectiveness of measuring to increase non-failure operation and substations’ schemes electrical connections availability