The article considers the electric energy flow and energy losses calculation problem on the basis of energy meter data using the scheme of the electrical network. The problem is referred to as the energy flow problem. A mathematical model of energy flow problem (EFP) is based on equations of energy balances in nodes and branches of the network, these equations are true with any state or topology network changes. The energy flow problem is proposed to be solved on the basis of state estimation approaches. General challenges and differences in solving the conventional state estimation problem and the energy flow problem are considered. These include the observability analysis, a bad data problem as well as the iterative calculation convergence.

This paper addresses the problems connected with fuzzy neural networks’ application in equipment technical state assessment problems at...

The issues of developing a ship’s wireless centralized control system are considered. An induction motor universal mathematical model is presented, with the help of which all types of faults of an induction motor are simulated. Some of the obtained experimental results received by simulating the faults of the stator, rotor and bearings are shown.

The article deals with the problem of the optimal development of power supply system of the big cities. The article offers various methodological approaches to discovering weakpoints of the existing power networks, as well as most effective ways of pinpoint actions in the situation of shortage of information and funding.

The present article deals with the issue of evaluation of state of urban power supply systems (hereinafter PSS). Such systems are characterized by large size and low reliability of the available data. The suggested evaluation model (EM) is based on elements of the fuzzy logic theory and on the informational graph structure of the power network. EM allows for evaluation of the PSS objects irrespective of their size. PSS object here stands for any part of the PSS, from power switch to complex PSS with substations and transmission lines of various voltage. Graph-based structure of the network model (NM) provides for connection between the objects and allows to select parts in necessary and sufficient detail. Evaluation is made by quantitative indicators that reflect performance of the objects in various spheres (technical, exploitation, ecological etc) with transition to qualitative states: normal, pre-emergency and emergency states.