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A droop control-based approach of effective power sharing among four parallel inverter-interfaced generators in an islanded microgrid has been proposed in this paper. Droop control strategy is applied during load change in islanded microgrid system in a way that power sharing among all the generators is also equal. This paper describes the small-signal stability analysis method to select the control...
This paper presents the use of the system identification method to find the appropriate transfer function of an interconnected power system with an energy storage system (ESS) and to design the robust ESS controller with the identified power system transfer function for robust stability improvement. The gradient search methodology is implemented to obtain an optimal power system transfer function...
In a coal-fired power generation system, energy efficiency is increasingly focused on due to the fact that the key indices of power plant such as coal cost and emission are closely related to energy efficiency. However, many coal-fired power plants lack effective energy efficiency program due to: diversified unit equipment type, insufficient or outdated original parameter setting, or diversified operation...
This paper proposed an economic dispatch scheme based on stochastic frame. Compared with conventional dispatch, the stochastic dispatch fully considers the variation of distributed load variations in the grid between dispatch intervals. The objective function of the stochastic dispatch scheme aims to minimize the distribution of fuel cost rather than a single value. Due to the stochastic analysis,...
This paper provides a circuit approach to the phenomenon of voltage unbalance emission due to line asymmetries in three-phase power systems. Indeed, it is well known that under the assumption of symmetrical phases, power systems are effectively analyzed through the symmetrical component transformation leading to uncoupled sequence circuits. In practical power systems, however, the assumption of symmetrical...
This paper presents performance analysis of future PEA distribution network under high penetration of PEVs home charging. The analysis and impact assessment was evaluated by the voltage unbalance factor (%VUF), according to IEC 61000-2-4: 2000-06 standards. A distribution network was modeled based on the DIgSILENT Power Factory and DIgSILENT Programming Language (DPL). The penetration of PEVs home...
Due to the power peak load shifting, flexible load has considerable schedulable potential and could effectively improve the active distribution network (ADN) operation. After analyzing the scheduling mode and response characteristic of two typical flexible loads, this paper proposed a model for multiperiod service restoration in ADN with flexible load participated. On the basis of flexible load interruption...
Plug-in electric vehicles (PEVs) can significantly increase the elasticity of residential electricity demand. This elasticity can be employed to shape the daily aggregated electricity demand profile of a system comprised of a large number of residential PEVs' users sharing one electricity retailer or an aggregator. In this paper, we propose a joint demand shaping and altering algorithm for managing...
Distributed resources are increasingly considered to be potential reserves for frequency control but some of these resources, such as demand response (DR) and battery energy storage systems (BESS), are limited in energy capacity. This may complicate their utilization in a frequency containment process if the power system does not have a proper strategy to coordinate and maintain the system frequency...
Integration of large-scale renewable energy (RE) sources in particular, wind and solar energy into the grid introduces current and voltage harmonics due to power electronics devices as well as inverter connected into the RE sources. Ensuring adequate harmonics in the line currents of RE integrated power system is one of the biggest challenges today. Therefore, this study investigates the potential...
A new methodology for optimal development of distribution networks with low carbon technologies is proposed in this paper. The complete planning model is developed as a two-stage optimization process, where the first stage deals with the investment problem and the second stage focuses on the operational aspects. The novelty of the proposed investment model is explicit incorporation of network security...
Environmental concern on fossil fuel power plants has been one of the drivers for the growth of renewable energy (RE) plants, particularly solar PV (SPV). Hence, it is imperative that the SPVs are connected to the power grid at suitable location to reduce technical losses and also provide peak load shaving. This would also require the determination of appropriate sizing and power factor of SPVs to...
This paper proposes an online optimal power management problem for microgrid energy market considering electric vehicle (EV) charging/discharging, load curtailment and grid power transactions. Fuel and emission costs of conventional sources, hourly profits, incentives for load curtailment, revenue/cost of grid power trade and charging/discharging price of electric vehicles (EV) are considered by the...
Time-shiftable loads, also known as deferrable loads, such as charging of electric vehicles, washing machines, dryers, are able to provide scheduling flexibility for demand response. This can help to reduce the energy cost under the condition of dynamic electricity pricing. It can also facilitate deeper integration of renewable generation by absorbing variability. According to the environmental conditions...
Uncertainty modeling of renewable Distributed Generations (DGs) has significant impact on optimal design of microgrids. Although the conventional Monte-Carlo (MC) simulation is the most accurate method for the uncertainty modeling it is a time consuming approach. In this paper, a new approach based on MC simulation is proposed for uncertainty modeling. The proposed method has a high precision in spite...
The integration of a great deal of intermittent renewable generation in future grids will require more operational flexibility. Residential demand response can provide the load shaping potentials thereby alleviating the need for operational flexibility. This paper intends to develop a centralized framework focusing on realization of domestic heating, ventilation, and air conditioning (HVAC) demand...
The penetration of wind generation in distribution networks is steadily increasing and may provide ample business opportunities for aggregators. While, residential demand response (DR) has proven to be a feasible economic tool in smart grids, the quantitative evaluation of various aggregator-based DR services is required to tap the maximum benefits from the DR flexibility. This paper provides an overview...
Energy Storage (ES) has become an important element in Active Distribution Networks (ADNs) due to progressive integration of renewable energy such as photovoltaic (PV). ES enables high penetration of intermittent PV while bringing several additional benefits to the network. Such benefits include loss reduction, voltage profile improvement and reverse power flow avoidance. This paper presents an analysis...
Blackouts in large interconnected power system can cause damage to equipment of power plants, interruption of production cycles and great economic losses. In order to avoid these blackouts, a forced islanding scheme with suitable restoration sequence will be effective. This paper proposes an algorithm that identifies the risk during an outage and forcefully splits the system into predefined islands...
The paper describes an experimental model of a hybrid power source (HPS) on the basis of solid oxide fuel cells (SOFC) being developed by the authors. HPS includes generating system, power storage system, pairing system and an active-adaptive control system. Generation system includes a reformer and a modular electrochemical generator based on SOFC. The storage system consists of a capacitive storage...
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