نتایج جستجو برای: power supply quality
تعداد نتایج: 1331956 فیلتر نتایج به سال:
W investigate how dynamic resource substitution in service systems impacts capacity requirements and responsiveness. Inspired by the contrasting network strategies of FedEx and United Parcel Service (UPS), we study when two service classes (e.g., express or regular) should be served by dedicated resources (e.g., air or ground) or by an integrated network (e.g., air also serves regular). Using c...
Power Quality is a major concern within power industry and consumers. Poor quality of supply will affect the performance of customer equipment such as computers, microprocessors, adjustable speed drives, power electronic controllers, life saving equipment in hospitals, etc. and result in heavy financial losses to customers due to loss of production or breakdown in industries or loss of life in ...
The liberalization of electricity markets has led to an increased cost pressure on power grid operators. As they are also responsible for the reliable supply of electricity, power grid operators aim to optimally balance the opposing objectives of cost and quality of supply. One main aspect of the quality of supply is the continuity of supply, i.e., the availability of electricity to consumers. ...
In this paper, the Renewable energy sources, which have been expected to be a promising alternative energy source, can bring new challenges when it is connected to the power grid. However, the generated power from wind energy source is always fluctuating due to environmental condition. In the same way wind power injection into the electrical grid affects the power quality due to the fluctuation...
The estimation of harmonic components of power voltage signals is one of the measurements prescribed by the power quality (PQ) standards (IEC 61000-4-30, 2008). In general, the harmonic components originate from non-linear elements connected to the power system such as non-linear loads (e.g., switched-mode power supplies) or transformers. An example of a distorted voltage measured in an office ...
For a steel producer optimum performance, namely cost-efficient production, is of primary interest. Therefore, from his point of view, any investment in the electric power supply is always seen as a cost. This applies in particular to Power Quality equipment such as SVC, which is justified only if it enables increased production or energy savings. Different aspects of this issue are highlighted...
The proliferation of surge-protective devices and switch-mode power supplies has radically changed the surge environment in the low-voltage AC mains. Monitoring surge voltages has lost significance and can be misleading. Instead, surge currents should be monitored. The paper describes the performance of a silicon-based surge-protective device acting as a "magnet" for impinging surges in the pre...
This article describes the issues related to analysis of reliability-exploitation power supply systems in transport telematics devices (PSSs TTDs). paper characterizes solutions, which are applied systems, and a PSS TTD from main source standby one. enables determining dependencies denoting probabilities system staying full ability state, safety threat unreliability state. A quality was conduct...
The quality of voltage and current delivered by the power utilities has become a major concern of the modern industries. The common power quality problems are voltage sag, voltage imbalance, transients, interruptions and harmonics. The two major power quality disturbances are voltage sag and harmonic distortion. In this paper, a Quality Power Provider (QPP) based on voltage source inverter is m...
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