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This paper presents a new method based on the cost-benefit analysis for optimal sizing of an energy storage system in a microgrid (MG). The unit commitment problem with spinning reserve for MG is considered in this method. Time series and feed-forward neural network techniques are used for forecasting the wind speed and solar radiations respectively and the(More)
In market operations, distributed generators (DGs) and price-sensitive loads participate in a microgrid energy market implemented in JADE. Each DG and each price-sensitive load is represented by the respective agents which perform various functions such as scheduling, coordination and market clearing subject to system, DG and load constraints. Each agent is(More)
The ineluctable variations of the solar radiation, ambient temperature, and partial shading affect the performance of the photovoltaic (PV) arrays, and hence incur supply-demand mismatches in the PV-based system. This paper proposes a hybrid energy storage (HES) composed of lithium-ion batteries and ultracapacitors that can be incorporated in the PV-based(More)
In this paper a mixed integer quadratic programming (MIQP) is proposed to solve the dynamic economic dispatch (DED) with valve-point effect (VPE) where the non-linear and non-smooth cost caused by VPE is piecewise linearized. However if the DED with VPE is directly solved by the MIQP in a single step, the optimization suffers convergence stagnancy and will(More)
This paper presents a new method for optimal sizing of an energy storage system (ESS) in a microgrid (MG) for storing electrical/renewable energy at the time of surplus and for re-dispatching. The unit commitment problem with spinning reserve for MG is considered in this new method. The total cost function, which includes the cost of ESS, cost of output(More)
Grid connected photovoltaic (PV) systems are becoming increasingly attractive as a generation alternative due to new developments in technologies, environmental concerns and transmission congestion management. Usually the energy storage system is used to store the excess power generated during off-peak hours and to return it to the system when power from PV(More)
Renewable energy sources are becoming more and more important for power systems. With increasing sizes and a mandate to operate as financial entities seeking to maximize benefits in an electricity market, power systems require highly effective planning tools. In this paper, an optimal capacitor planning method based on optimal power flow is proposed for a(More)
A centralized reactive power compensation system is proposed for low voltage (LV) distribution networks. It can be connected with any bus which needs reactive power. The current industry practice is to locally install reactive power compensation system to maintain the local bus voltage and power factor. By centralizing capacitor banks together, it can help(More)
With the more advanced technology and decreased cost of batteries, it is less costly to form large-scale battery energy storage systems (BESSs) to take part in grid applications. BESSs are increasingly considered as participants for grid regulation services because of their fast responding ability. This paper reviews various control schemes of the BESSs in(More)
The battery energy storage systems (BESSs) have been increasingly installed in the power system, especially with the growing penetration rate of the renewable energy sources. However, it is difficult for BESSs to be profitable due to high capital costs. In order to boost the economic value of BESSs, this paper proposes a hierarchical energy management(More)