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In a video streaming application, quality of experience for a user can be affected by various factors. The video quality can be improved if the effective throughput can be increased at an acceptable packet loss rate and low latency. To reduce the packet loss rate over error-prone channels, a cross-layer error control scheme is developed for heterogeneous data transmission over wireless channels in...
Renewable energy generating units (REGNs) are widely used in microgrids (MGs). REGNs can reduce the operating cost of a MG; they also affect the operating states of the connected grids, especially the voltages. The larger the power generation of REGNs, the greater the impact on voltage of MGs. Therefore, the power generation of a REGN in a MG should be limited for the grid security. In the current...
This paper aims to analyze the power flow of a grid-connected 11.4 kV high-voltage microgrid (MG) with various distributed resources (DRs). First, related papers and technological reports were extensively surveyed. Accordingly, five different types of DRs and their controllable loads were considered for integration into two 11.4 kV primary feeders. These DRs include two 1.5 MW diesel engine generators,...
This work develops the operational procedures of distributed generation sources (DGSs) in a micro-grid. A micro-grid is a controllable small-scale power system comprised of distributed generation sources (DGSs), storage devices, controllers, and loads. The DGSs may be sustained energy sources or intermittent energy sources. A micro grid consists of different type of DGSs, and its operational procedures...
This work proposes a load transfer scheme for radial distribution feeders with distributed generation units. A distribution feeder may be operated with distributed generation units in parallel. Conventional load transfer schemes do not consider this kind of operating condition. Hence, they are not suitable for power distribution systems including distributed generation units. In this paper, the load...
The main purpose of this paper is to analyze the operation and nature of a low-voltage AC microgrid with various distributed energy resources (DERs). First, a 400 V low-voltage AC microgrid integrated with a 30 kW microturbine generator, a 13 kW photovoltaic generation system, a 10 kW fuel cell generation system, and a 10 kVA wind turbine generator was employed as the sample system. Second, a sequential...
This paper presents an analysis of the unbalanced operating situations of a medium-voltage distribution feeder whose arrangement is changed from an open-loop to a closed-loop type. First, a sample system involving an open-loop distribution feeder is constructed. Second, the sample system is modeled and simulated by the OrCAD PSpice simulation software. The transformers and feeders in the sample system...
This work investigates the unbalanced operation conditions of two interconnected radial distribution feeders. To connect two radial distribution feeders is an important method of improving the reliability of a distribution system. However, it also impacts the operation of the system. In this work commercial software, OrCAD PSpice is used to build three-phase equivalent models of the sample distribution...
This paper has evaluated the effects of a cogeneration plant on the system imbalances of a radial three-phase four-wire distribution feeder connected with it. A three-phase four-wire distribution feeder is often operated under unbalanced circumstances by reason of unequal individual phase loads. The degree of voltage and current imbalances in a three-phase four-wire feeder might be significantly enlarged...
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