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This paper proposes a new pricing mechanism and dispatch model for reactive power service from distributed generation (DG) resources, including wind turbines and solar photovoltaic plants, connected to a low voltage distribution system. Novel cost functions of reactive power service are proposed for DG resources as well as alternative VAR suppliers such as STATCOM and capacitor banks, taking into...
As the issues on market deregulation and renewable energy utilization are gaining significance, distributed generators are planned and installed in distribution systems to supply consumers directly. The distribution system is, therefore facing new challenges on its dynamic behavior with the addition of new dynamic devices. This paper investigates the small signal stability of renewable energy based...
High levels of distributed generation have been installed in power systems and even a greater amount is expected to be deployed in the near future, with a large percentage likely to come from renewable energy sources. As such, Distribution System Operators (DNOs) will need to change their old “business as usual” passive approach, to one that adopts integration of control and communication technologies,...
This paper discusses investment strategies in a microgrid system consisting of cogeneration system and renewable power generation under uncertainty in the natural gas price. Although incentives for introducing distributed energy system increase these days, volatile natural gas prices make its investment in gas fuel distributed generation systems risky. Therefore, it is important to evaluate the risk...
Basic, stage 1, MicroGrids combine distributed generation, intelligent load control, and in many cases energy storage, to form a well-behaved aggregate load or generator. This allows more straight-forward and widespread integration of distributed generation. More advanced MicroGrids (stage 2) can further add the capability to isolate such small sections of the network and continue to operate them...
Distributed Generation (DG), has started becoming a reality in electricity networks. This analysis focuses more on a specific configuration of networks with DG, the Microgrid. Microgrids can operate in a coordinated way either interconnected to an upstream distribution network or autonomously in case of faults in the upstream medium voltage network, like the power systems of physical islands. Under...
Summary form only given. Despite the technical challenges in properly accommodating distributed generation (DG), one of the major and well-recognised benefits is the ability of DG to defer future demand-related network investment. It is, however, often poorly represented in existing planning approaches and analysis ignores the potential security of supply benefits. Here, a novel, more integrated,...
Microgrid technologies are highly developed in low voltage networks, improving the power supply reliability and energy efficiency. Therefore, in this paper, the concept, including the configuration, principle and operation of microgrid, will be specified, comparing the microgrid with the prior distributed generation. Additionally, in order to justify the feasibility, the economical benefit analysis...
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