Scientific Journal of KubSAU

The article describes scopes and new technical decisions of static converters of the electric power with the improved operation-characteristics, executed with use of new element base and a modular principle of construction

In article the basic lacks and characteristics of solar power stations, features of their design, work and prospect are considered

The article describes scopes and efficiency of application of solar photo-electric installations on the territory of the Krasnodar region, and as definitions of their key parameters

The article discusses the structural and control systems schematics and voltage stabilization in phase bridge circuits solar power inverters with PWM output voltage and improved performance

Nowadays, for maintenance of uninterrupted electro supply we found the most actual using sources of re-newed power; however, their application for electro supply of agricultural consumers is limited to a line of ecological and economic problems of the accumulators connected first of all with use. In the article we present one of the variants of the decision of the designated problems

In the article we have considered the basic advantages of the choice of parameters of static converters, as well as the basic classifications of static converters

In the article the description of the basic kinds of sources of the electric power, their merits and de-merits is resulted. Nowadays independent sources of the electric power on static converters are the most universal. In spite of the fact that electronic devices are capable to provide reliable enough electrosupply with consumers of various capacities and character of loading, however their bad fitness to high - dynamic loadings still is. Therefore elec-tromachine converters remain the basic source of the electric power, as the steadiest to overloads. So even in transport independent sources, for which weight-dimensions parameters are most critical, electromachine converters are used. In the article typical circuits of electromachine converters with synchronous and asynchronous generators, their advantages and lacks in relation to static converters are resulted. And as methods of increase of their efficiency, for example work on the part frequency, are resulted. For the sources executed on static converters, use of circuits with an intermediate link of the part frequency is most perspective, which, in its turn, allows to lower weight-dimensions parameters. As a rule, static converters have bad quality of a target voltage, therefore for increase of its quality use various target electric filters. Controlled filters whit electronic elements in their structure have the greatest efficiency

In this article technical requirements to static converters are examined. We can treat as the basic parameters: efficiency and quality of a target voltage. Weight-dimensional parameters, reliability, maintainability are basic operational parameters, as well as target capacity, size of an starting and target voltage belong to key parameters of static converters. As a rule designing of converters is a uniform constructive complex. As at designing, time of an operating time until first failure is taken into account, time of guaranteed work of the separate elements included in the static converter, are determined on the statistical data. Failure of separate elements of parts of converters are possible because of internal (time of guaranteed work) and external (short circuits, overloads) factors. In the article we have offered the ways of reduction of influence of external factors (for example, we used high-speed automatic switches or iterative static converters in which parts of a power circuit were included in parallel). Using universal static converters allows raising some parameters of efficiency simultaneously. In the article we have also considered a scheme of the iterative converter with variable structure which allows (depending on start and target conditions or requirements) forming an output capacity of the required level and quality without constructive change

In the article we present generalized block diagrams of stationary and transport systems of uninterrupted electrosupply, as well as their maintenance and the basic operating modes providing uninterrupted electrosupply of crucial consumers. Classification of systems of uninterrupted electrosupply is resulted. The basic classification attributes of systems of uninterrupted electrosupply are their assignment for stationary or transport consumers of the electric power, types of used basic, reserve and emergency sources and converters of the electric power. Besides systems of uninterrupted electrosupply can be classified under circuits of connection to consumers of the electric power, their division on a sort of a current (constant, variable, high-frequency), breaks in electrosupply, to type of the switching equipment and so on. For the estimation of the efficiency of systems of uninterrupted electrosupply it is offered to use the following criteria of efficiency: Power and weight-dimension parameters, parameters of reliability, quality of the electric power and cost. Analytical expressions for calculation of parameters of the estimation of efficiency of systems of uninterrupted electrosupply are resulted. The classification of systems of uninterrupted electrosupply suggested in article and modes of their work, and also the basic criteria of an estimation of efficiency will allow raising efficiency of pre-design works on creation of systems with improved customer characteristics with use of modern element base

It is known, that today, the one of the promising areas to effectively address issues of energy saving is applying renewable energy sources. Despite the fact that the current solar PV stations have the main drawback associated with the high cost, the prospects of their application in autonomous systems of electrosupply are evident when they are used in combined (hybrid) systems. In such systems, other types of renewable and traditional sources of electricity, which, in addition, produce heat, might be used as well. We have disclosed the prospects of the solar industry; also, for solar energy assessment we examined analytical expressions allowing defining the energy derived from solar radiation for specific surfaces. The calculations start with obtaining statistical data obtained at meteorological stations which keeps records of the intensity of the total (direct plus diffuse) radiation on a horizontal surface, and the intensity of direct solar radiation. The article presents features of the calculation taking into account the climatic and territorial conditions, on the example of the Krasnodar region. Considered calculation procedure is the first stage of designing solar power plants. Further, we determine the total capacity of electricity consumers, as well as the quality requirements for electricity, including continuity of supply, and then we get to the construction of the block diagram of the electricity supply. In this scheme, we must provide primary and backup power sources. We select the main equipment of solar power plant (solar panels, inverters and storage batteries)