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This paper presents enhanced firefly Algorithm (EFA) for improving the control strategy of UPQC with the aid of wind energy conversion system (WECS). The proposed system is connected with the grid/load and their dynamic behavior is determined. The primary objective of the proposed technique is to mitigate the power quality (PQ) issues present in the system. In the proposed method, the performance...
To manage the microgrid effectively, it is important to get the power information among multiple distributed generation (DG) units. However, when the droop control method is adopted, as the corresponding DG units cannot be simply modeled as VF or PQ buses, the conventional power flow algorithm may become inapplicable. To solve this issue, a time domain iteration (TDI) based power flow algorithm is...
This paper presents an algorithm developed for the optimization of Low Voltage (LV) grids that takes advantage of Distributed Energy Resources (DER) such as storage devices and flexible loads. The proposed approach is based on a multi-temporal Optimal Power Flow (OPF) algorithm that feeds from forecasting tools for load and renewable generation, which means the optimization model looks at a 24-hours...
Nowadays intelligent systems of controlling and monitoring electrical grids such as SMART GRID or “Intelligent Well” are widely implemented in Russian industrial enterprises. On the other hand, existing methods of modeling electrical grids are not able to estimate advantages and potential problems of using intelligent technologies under real conditions. Special attention is paid to oil producing companies...
In this article, Power generation system model includes a turbine model of wind system, PMSG model, and a Simulink model of drive train. The generated power through the wind power plant is fed to three phase linear and non-linear load. The power electronics based shunt connected custom power devices are used to suppress the power quality problems at constant speed turbine. The objective of this paper...
From the viewpoint of the emerging concept of smart grid, distribution network will require fast power flow solution that must be resolved as efficiently as possible. Presence of distributed generators and power electronic based compensating devices, in modern medium and low voltage distribution networks, additionaly expands requirements for performances of algorithms for power flow calculations which...
This two-part study first proposes the Generalized DC (GDC) power flow formulation which makes critical enhancements to the DC model by addressing its model limitations, with abilities to approximate bus voltage magnitudes and model networks with high resistance to reactance (R/X) ratio. Then, the GDC is applied to the current RTO electricity market clearing algorithms to model bus voltage security...
The microgrids (MGs) integrates renewable energy sources (RESs), energy storages (ESs) and local loads to a one self-control energy system. In 2nd quarter of 2015 the global microgrids capacity reached the 12 GW. That result is a near triple more than in 2nd quarter of 2014 [1]. The MGs are capable to manage energy generation, storage and demand, making the user less dependent of the main grid, but...
In this paper, power loss index method is used for the placement of D-STATCOM in radial distribution system for reduction of line losses and improvement of voltage profile. For this, the load flow is carried out for calculating bus parameters. The mathematical modeling of D-STATCOM is performed for calculation of reactive power injections of D-STATCOM for all the buses. This reactive power value is...
This paper presents a new development for load flow analysis in radial distribution systems. The aim of this paper is to reduce data preparation to solve load flow in distribution system. The proposed method uses simple equations and requires less computation time and number of iterations. The load flow algorithm used in this paper is based on forward and backward sweep method. The method is efficient...
Service Restoration is defined as when a failure happens, we can use some ways to decrease the failure effects and restore power supply. Restoring the losing power area that has no fault reasonably and quickly is the essential requirements in self-healing control of distribution system with distributed generations. This article puts forward a hybrid decision diagram model for service restoration in...
A modified load flow algorithm for microgrids operating in islanded mode is developed in this paper. The proposed algorithm is able to perform load flow calculations in networks without making use of the slack bus concept, and is suitable for applications to islanded microgrids. The developed algorithm includes the explicit representation of the steady-state characteristics of microsource controllers,...
We consider the problem of dynamic reactive power compensation in power distribution networks populated by a large number of microgeneration devices. We model the power losses minimization problem in the case of stochastic, time-varying reactive power demands. For this control problem, we propose a randomized iterative optimization algorithm, and we define a suitable metric for evaluating this algorithm's...
A simulation-based approach to optimal design of systems requires collective solution to three related problems: selection of the best equipment, selection of the best system configuration, and optimal operation of the system in a mission-oriented sense. We solve these three problems by applying an improved Particle Swarm Optimization (PSO) algorithm on top of a toolbox that rapidly instantiates system...
According to the target of minimal line losses and a power factor equal to one, the present work studies two concepts of instantaneous compensation of nonactive current which are generally applied to polyphase systems. The analysis is defined both on the basis of the instantaneous value concept, for arbitrary voltage and current waveforms, and on the basis of the average value concept, for steady-state...
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