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In the case of ensuring the reliability of power supply, in order to improve the economy of the distributed generation systems, it should be based on different resource conditions to optimize the design of the system. This paper constructs the distributed power generation system structure of multiple distributed power supply. The main factors affecting the optimal design are discussed qualitatively...
Microgrids have been proposed in order to handle the impacts of Distributed Generators (DGs) and make conventional grids suitable for large scale deployments of distributed generation. However, the introduction of microgrids brings some challenges. Protection of a microgrid and its entities is one of them. Due to the existence of generators at all levels of the distribution system and two distinct...
A trend away from large conventional electrical power generation stations such as hydro, coal-fired, and nuclear toward smaller Distributed Generation (DG) has both benefits and complications. While DG can capitalize on renewable energy and can reduce transmission losses by being closer to local loads, the intermittent availability of some power sources coupled with the current lack of a “smart grid”...
This research examines optimal operation of microgrid systems. Microgrids are disaggregated from main transmission grid. Microgrids are able to integrate distributed renewable energy, take advantage of waste heat, provide higher power reliability, reduce electricity transmission loss, and decrease greenhouse gas emissions. The study considers solar power, wind power, biomass power, gas turbine, fuel...
Kyushu Electric Power Co. has been carrying out research into a microgrid systems for small isolated islands, which is characterized by combining internal combustion power, renewable energy, and batteries, to investigate the effects on CO2 emission reduction and fuel cost reduction. Through numerical simulation and basic performance testing, it has been confirmed that the issues to resolve for stable...
In order to increase the amounts of renewable energy accommodated in the system, new tools that take into account the horizon of the decision taken are necessary. Feature like the availability of new information can be included in a dynamic optimization framework and therefore help mitigate congestion in the system and have positive effects on distribution systems. This study proposes a new algorithm...
Distributed generation (DG) systems have many impacts on the power network. Previously, the power was supplied from the centralized generating unit and then dispatched to the loads, but today DG systems provide electrical power at the customers' sites and slightly decline the losses due to either transmission or distribution of the electricity. Furthermore, DG systems are able to reduce the emission...
Economic, technology and environmental incentives are changing the features of electricity generation and transmission. Centralized power systems are giving way to local scale distributed generations. At present, there is a need to assess the effects of large numbers of distributed generators and short-term storage in Microgrid. To accommodate the high demand of renewable energy and the environment...
This paper proposes a stochastic time-series based method to simulate the volatility of intermittent renewable generation and distributed storage devices along timeline. The proposed method can calculate the optimal timeline for different electricity markets and power systems. In practice, the proposed method is potentially useful for designing market rules and evaluating different design options...
The energy shortage and environment pollution is attracting more and more attention with the social development. Hence it is important to develop new energy and renewable energy that are bio-energy, wind energy, solar energy, small waterpower, tide energy, terrestrial heat energy, and hydrogen energy and so on. The research of distributed power system with the solar and wind power is the leading domain...
Although the financial crisis shrinks oil price, human as an entire race still face the future of a hot, flat and crowded world [1]. Therefore, a critical transformation from our traditional energy consumption manner of fossil fuel combustion must be made. After years of endeavor in research and experiment, a number of Renewable Energy Sources (RES) has already become technically available as alternatives...
Recently, renewable energy such as wind turbine generator and photovoltaic system are introduced as distributed generators (DGs). Connection of a large amount of distributed generator causes voltage deviation beyond the statutory range in distribution system. Reactive power control of inverter interfaced with DG is one of the solutions against this problem. Additionally, reactive power control has...
In this paper, a renewable power generation system is firstly introduced. This system consists of three main units: a microturbine power generation unit, a photovoltaic (PV) power generation unit, and an ultracapacitor quick energy storage (QES) unit. The corresponding control strategies of these units are subsequently given. Then, a new prediction model-unequal-M-division N-point Euler-type Moving...
In this paper, the idea of operating an inverter as a synchronous generator is developed after establishing a model for synchronous generators to cover all dynamics without any assumptions on the signals. The inverters which are operated in this way are called static synchronous generators (SSG). This means that the well-established theory/device for synchronous generators can still be used for inverters,...
This paper discusses the issue of turboexpander (TE) as distributed generation. TE is a centrifugal or axial flow turbine through which a high-pressure gas is expanded to produce work that is typically used to drive a compressor. It can be used to convert the energy of gas or vapor stream into mechanical work as the gas or vapor expands through the turbine. TE converts the wasted energy in the gas...
Following the steps of the gas industry, the traditional paradigm of the vertically integrated electrical utility structure has begun to change. In the United States, the Federal Energy Regulatory Commission (FERC) has issued several rules and Notices of Proposed Rulemaking (NOPR) to set the road map for electric utility deregulation. The power crisis in California has drawn great attention and sparked...
With power deregulation and the formulation of horizontal and competitive electricity market, non-utility-owned distributed generators (DG) are able to feed power into the utility distribution system. Today, the majority of ISOs have established the Demand Response programs to alleviate the transmission bottlenecks and to defer the infrastructure investments, which presents opportunity for distributed...
A typical micro-grid with multi-energy generators (MMEG) is composed of renewable energy generation systems including wind, photovoltaic, biomass etc., and fuel cells, energy storage and local loads. As a cost-effective research method, testbeds for MMEG in lab have been developed in some key projects all over world. This paper presents a comprehensive testbed for MMEG (TB-MMEG) in lab built in Hefei...
Electric Utilities permitting interconnection of generation (small and/or large) on their power systems have long had standards which any entity wishing to interconnect has to meet. Recently the growing importance of distributed generation (mostly less than 10 MVA), especially using renewable sources, has prompted the creation of IEEE Std. 1547 which sets requirements and guidelines for interconnecting...
Microgrid is a new concept in the arena of green power generation, which is substantially attracting many researcherspsila interest due to its potential to extend the applications of the distributed generations, especially the renewable energy. So far not much research is done on the microgrid behavior as a whole system. In this paper models for the main microsources including wind turbines, diesel...
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