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This paper presents a new method for operating microgrid. Basic control methodology is to de-couple PQ control for grid-forming distributed generator (DG) whose new extra role is to act as reactive power sensor besides generating real power into the microgrid. Reactive power from the grid-forming DG is transferred to and from the instantaneous var compensator when there is a switch-in or switch-off...
In this paper, the dynamic modeling of a doubly-fed induction generator-based wind turbine connected to infinite bus (SMIB) system, is carried out in detail. In most of the analysis, the DFIG stator transients and network transients are neglected. In this paper the interfacing problems while considering stator transients and network transients in the modeling of SMIB system are resolved by connecting...
This paper presents the design of secondary voltage control by tuning the parameters of coordinated PID controllers to eliminate voltage violations in power system contingencies. The coordinated PID control parameters are tuned by using genetic algorithm. The study is presented on modified IEEE 14 bus system. The coordinated secondary voltage control is assigned to the generators and STATCOMs in order...
Presently, voltage stability indices are ones of powerful tools used to monitor and evaluate power system stability. The purpose of the presented work is to analyse, assess and compare different indices from the point of view of the sensitivity to the network disturbances. The proposed method allows to locate the sensitive area and also to monitor the behavior of indices in order to select the best...
Voltage stability has become major concern in power system planning and operation, and deals with system adequacy and security. Amount of reactive power reserves at generating stations is a measure of the degree of voltage stability. In Bangladesh power system generating units are mostly running at their highest capacity, no active or reactive power reserve is being kept for supporting system contingencies...
A simulation on developing the voltage control with active management system of Wind Turbines (WT)-diesel generator (DG) hybrid system considering economic criteria is exhibited in this paper. The hybrid system model is developed from mathematical equations of WTs as well as diesel generators and evaluated the system performances. Minimizing the overall cost and power losses the proposed active management...
Static Synchronous Series Compensator (SSSC) is an efficient member of Flexible AC Transmission Systems (FACTS) devices. SSSC is connected in series with transmission lines to control the active and reactive power flow in these lines. In this paper, Grey Wolf Optimization (GWO) algorithm is developed for solving the optimal reactive power dispatch (ORPD) problem. The ORPD problem is solved with incorporating...
This paper presents WECS (wind energy conversion system) installed with BTB (back-to-back) medium voltage diode clamped five-level converter and SCIG (Squirrel-Cage-Induction-Generator) for a large capacity wind turbine (5MW). The DTC (direct torque control) has been used for the machine side diode clamped five-level converter. The use of DTC with the MLC (multilevel converter) gives a better performance...
This paper proposes a solution to voltage rise and/or sag in single-phase unbalanced distribution systems using photovoltaic (PV) arrays with reactive power capability. The PV is controlled to inject maximum power using Maximum Power Point Tracker (MPPT) to supply local loads when the solar power is available. The reactive power capability of the PV inverters regulates the bus voltages in transient...
High penetration of Distributed Generation (DG) in Medium Voltage (MV) power grids usually leads to abrupt voltage raises in the presence of either low demand conditions or high power production from renewable sources. In order to cope with the possibly resulting voltage limits violation, a typical adopted approach is the disconnection of the distributed generators or the curtailment of the generated...
The ever-growing connection of distributed renewable generators is causing important modifications of the standard power flows and is increasingly challenging the operation of the electrical distribution network. In this light, electrical storage systems (ESS) will be key attributes for future grids that accommodate massive penetration of renewable plants. In this paper, the possibility to consider...
Due to the benefits of distributed generation (DG), in particular wind DG on a power system, researches on its optimal allocation increased. However, most of these studies failed to incorporate the stochastic nature of wind which could lead to an erroneous result for not considering uncertainties. To address these uncertainties, different wind DG models are used. This paper compares how optimal allocation...
It is necessary to meet both efficiency and reliability of power systems operations with regard of electricity demand whilst taking into account voltage stability concerns. The reactive power dispatch problem has been defined and applied with the optimization of these three objectives, which are the minimization of power loss, voltage deviation and power curtailment respectively. Many optimization...
Distributed generators (DG) are slowly changing the operation electricity distribution systems as it offers advantages such as avoiding transmission and distribution costs, and promoting the use of renewable energy sources. However it comes with major integration issues, one of which is the pronounced voltage variations in the network, especially those with intermittent DG. Voltage control can be...
The various changes that have occurred in the electricity markets around the world have introduced competition among the participants in this sector. Thus, the generation agents that participate on electrical energy auctions may prefer to build optimal strategies to maximize their profits. Mathematical models based on game theory have been used in the analysis of electric energy markets and especially...
In this paper a particle swarm optimization with time varying acceleration coefficients (PSO-TVAC) algorithm is applied to solve the optimal reactive power dispatch problem (ORPD). The ORPD problem is formulated as nonlinear, non-convex constrained optimization problem considering both continuous and discrete control variables, also it has both equality constraints and inequality constraints. The...
With the expected surge of Electric Vehicles (EV) in the market in the near future, a threat to the grid is anticipated. Introducing EVs in the grid serves as an additional load thus arising the need for increased generation which increases the total fuel cost. An optimization algorithm has been proposed to minimize the total fuel cost by performing Economic Load Dispatch (ELD) of the committed generators...
Presently world facing crisis of power all over the world. For a comfort survival, mankind has to adopt different methodologies to over come this shortage and instability of different parameters in power system. Here, the most concern parameters are voltage and frequency variation. Moreover, voltage variated is a big issue in power system particularly distribution end voltage. This paper introduces...
The integration of the renewable power generation into the existing grid has been increased significantly and it is expected to be increased further in near future. The placement of renewable power generation units can be done accordance with reactive power loadability and it has to be taken care during the optimal placement. In this paper, a particle Swarm Optimization (PSO) based optimal placement...
The economic load dispatch in thermal power plant is done for minimizing the fuel generation cost by assigning optimum power generation of each unit while maintaining the equality constraints and inequality constraints. Mostly the fuel cost is calculated only based on real power cost, but it is also very important to consider reactive power for secure procedure of power systems, therefore the cost...
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