In this paper we propose mathematical model of implicit-pole synchronous generator of mini-CHP. The model is based on a full Park-Gorev differential equation. The saturation of the machine is taken by using the method of partial magnetic characteristics. This method allows most accurate evaluation of the change of parameters of an equivalent circuit of the nonsalient-pole generator in the absence of information about the magnetic properties of the machine. The model is Implemented in Simulink. Application of the model is possible when calculating the steady-state and transients in distribution electrical net wich contains implicit-pole synchronous generators.

Keywords: nonsalient-pole synchronous generator, implicit-pole generator, mathematical model, Park-Gorev differential equation, magnetic characteristics, transients

In this paper we propose mathematical model of salient-pole synchronous generator of mini-CHP. The model is based on a full Park-Gorev differential equation. The saturation of the machine is taken by using the method of partial magnetic characteristics. This method allows most accurate evaluation of the change of parameters of an equivalent circuit of the generator in the absence of information about the magnetic properties of the machine. The model is Implemented in Simulink. Application of the model is possible when calculating the steady-state and transients in distribution electrical net wich contains salient pole synchronous generators.

Keywords: salient-pole synchronous generator, mathematical model, Park-Gorev differential equation, magnetic characteristics, transients

Currently in the Russian market appeared a large number of light sources and lighting devices of different manufacturers. This creates great difficulties for selecting the most energy-efficient and reliable light sources. To solve the problem, we propose the concept of estimating the life cycle cost. In the article the technique of an economic choice of lighting devices on the basis of "life cycle cost" depending on the hours of lighting per year. The calculations for retrofit (standard and halogen incandescent, compact fluorescent and led lamps) and linear (office fixtures with fluorescent lamps as well as similar led) lighting devices. The calculations are performed taking into account the discounting. Identified the most cost-effective sources of indoor lighting for public and municipal institutions, depending on the hours of lighting per year.

Keywords: the choice of lighting, life cycle cost, economic analysis