Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Taras SHCHUR"

The incentive scheme for maintaining or improving power supply quality DOI:10.15199/48.2019.05.20

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Modern power systems must supply consumers with the high-quality power with the certain continuity level (that means the term «reliability of power system's work»). There are various aspects of realization of this process (objective and subjective aspects; material, technical, organizational aspects and others). All of them must be analyzed by staff of power distribution companies for improvement of service quality and ways of power supply process perfection must be defined. Employees should use precise and clear algorithm of actions for success of the task performance. They must understand consequences and an ultimate goal. An incentive scheme must be in the power distribution companies for conscientious work of employees. The implantation of an incentive scheme for maintaining or improving general continuity levels was one of recommendations the Council of European Electricity Regulators (CEER) that were submitted in 5-th benchmarking report [1] in 2011 year. The regulation of the service quality in European countries is considered in 6-th CEER benchmarking report on the quality of electricity and gas supply [2]. The systems of regulation are created on the basis of: Continuity measurement is a prerequisite for setting standards and reward/penalty regimes; Maintenance and improvement of general continuity levels as a result of the investment decisions of network operators with implementing reward/penalty for the achieved quality levels; Minimum standards for quality levels will guarantee that consumer will be compensated if the standard is not met by the network operator. The review of use of incentives systems for the distributive companies in the European countries on the basis of key reliability metrics is considered in [2]. Key reliability metrics are indicated in IEEE Std. 1366-1998 Trial-Use Guide for Electric Power Distribution Reliability Indices [3]. These must definitely be interpreted and used as re[...]

The influence of the specifications of the elements of range of exciters voltage inverters on their spectral characteristics DOI:10.15199/48.2019.05.21

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The trend of wide implementation of voltage inverters in various industries is forcing to focus on issues related to electromagnetic compatibility. For example, modern power inverters keys, especially MOSFET and IGВТ with have very high switching speed, become sources of electromagnetic interference. The range of generated interference extends from the carrier frequency of the inverter (several hundreds of KHz) to radio frequency (tens of MHz). Low-frequency interferences up to 2 kHz penetrate into the supply network, high-frequency (> 10 kHz) components create a powerful radio interference [1-4]. It is known that the PLL is generally described by nonlinear differential equations [5]. The non-linear nature of the circuit, which determined by the existence of semiconductor elements (diodes, transistors, thyristors, etc.) which are part of the inverter structure chart, is the reason for generating the higher harmonics. Therefore, we carry out a research on the effects of the non-linear nature of the drivers elements, namely the research of influence of range exciters and inventers systems of phase timing on the spectral characteristics. One of the major problems which must be solved during design and production of the voltage inverter is to eliminate adverse effect of the exciter on the technical characteristics (TС) of the inverter, in particular on electromagnetic compatibility. Thereby, the development of recommendations on the choice the optimal parameter values of the phase-locked loop (PLL) of frequency synthesizer on the basis of accurate numerical analysis occurring therein is very important. For the calculated ratios we use the method of functional expansions of Voltaire, which currently is one of the most convenient and accurate methods for analyzing non-linear dynamic systems [6, 7]. Experiment As the main circuit of direct digital synthesizers (DDS) of range exciters (which basing on the analys[...]

Justification of ice melting capacity on 6-10kV OPL distributing power networks based on fuzzy modeling DOI:10.15199/48.2019.05.26

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As it is known [1], the key circuit parameters of ice melting are the value of active power losses per unit of wire length in the mode of melting deposits (melting capacity) and the time of melting deposits, which is a function of the melting capacity. When designing the ice melting schemes with using the special electric power plants of ice melting (limiting reactors, bearish autotransformers [2], iceprotected transformers [3]), which have recently used more often for harmonization of power system with the lines’ parameters. There is a problem of choosing an independent option of melting schemes (the melting capacity of deposits that must be provided by such a facility). The feasibility of mass industrial production of standardized installations for ice melting on 6-10 kV overhead power line (OPL) wires and a variety of parameters of electrical networks 6-10 kV lead to the need to solve this problem, taking into account factors of input data uncertainty. Approaches for designing of ice melting at 6-10 kV OPL electric distribution networks [1, 4] showed that the existing technical and economic models do not allow to take into account the effect of melting deposits power on cost of melting schemes characteristics and make selecting this option. In [5] we developed a single criterion technical and economic model for optimization the parameters of the ice melting schemes at 6-10 OPL using the reduced cost criterion, which takes into account the impact of melting capacity of deposits on such factors of the melting schemes as insufficient outputting of electrical energy to consumers during melting, electric power consumption for melting, the cost of electric power installations for ice melting, the cost of additional capacity of power transformer of the 110-35 / 6- 10 kV district substation. Basing on the model we carried out optimization of power ice melting, which should be provided by different electric power plants wi[...]

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