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This paper proposes a novel distributed control scheme for DC microgrids to acquire minimum generation cost and recover the global average voltage with consideration of capacity constraints. Our main focus is on constrained problems where the power of each distributed generator (DG) is restricted to lie in the feasible region. In this paper, a global load observer (GLO) is introduced that uses neighbor's...
This paper introduces a metaheuristic Intervention Scheme Based Mean Variance Mapping Optimization (MVMO-IB) algorithm for solving the Optimal Reactive Power Management (ORPM) problem. The intervention scheme, objectives and constraints used in the MVMO-IB have been derived through surveys conducted at transmission system control center and are supported using literature. Contingency analysis feature...
The increasing proliferation of distributed generations (DGs) in distribution networks has brought several management and operation challenges. To improve energy efficiency and voltage profiles of the distribution grids under different operating conditions, this paper propose a distributed optimal reactive power control solution combined with gradient algorithm. In the proposed method, each DG or...
This paper presents results of a heuristic optimization method for parameterization of decentral reactive power control, which can be used to improve static voltage quality in distribution grids. With an optimized Q(V)-curve it is possible to significantly reduce the additional reactive energy and accomplish lower losses in the grid while keeping the voltage within the specified limits. In this paper...
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...
The aim of this paper is to propose a new voltage controller for Distribution System Operators (DSOs), based on a multi-objective optimization, which considers the presence of microgrids in the distribution network. This paper is focused on DSO's optimization problem, which has to minimize grid losses, and to take into account some ancillary services provided by the microgrids, such as demand response...
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...
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...
The grid integration of the Doubly Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS) with the maximum energy extraction out of it is the main focus of the research now a days. The controllers employed for such controls need to be coordinated and their parameters has to be optimized. It is a very cumbersome job to find the optimal values of the control parameters of a number...
In this study, in order to reduce the abnormal voltage drop or rise in the distribution systems with distributed generators, we consider a multi-objective function to be optimized in such a way that the voltage profile is enhanced while the total active power loss in the network is minimized under some operational constraints. Capacitors and static VAR compensators are also coordinated with the distributed...
This paper focuses on the active power loss minimization by optimal voltage control in a power system using a new optimization algorithm. The cost function is assumed to be convex. The algorithm we propose to address the numerical solution of this problem is based on the exploitation of the convex problem structure using a sequential convex programming framework that linearizes the nonlinear power...
This paper demonstrates the already established fact that by using Distributed Generation (DG), voltage profile of a distribution system can be improved. N-R method is used for load flow analysis. A standard IEEE 14-bus power system is used. To reduce losses three optimization techniques i.e. PSO(Particle Swarm Optimization), GSA(Gravitational Search Algorithm) and hybrid PSOGSA is applied to the...
This paper solves a daily multiobjective optimization model for efficient operation of power distribution systems. The model aims to minimize the voltage deviations, minimize power losses and minimize the energy costs of the distributed generators. The model is implemented on a modified 33 bus distribution system by including: two voltage regulators and four distributed generators. Three different...
PID controller tuning plays a very important role in the proper functioning of the plant in which the controller is incorporated. A modification to the already existing algorithms like the differential evolution (DE), particle swarm optimization (PSO) and teaching-learning-based optimization (TLBO) algorithms is done in this paper. The modification is done in the initialization method and is called...
Interconnection of relatively large independent power producers (IPP) in distribution feeders has created new challenges for the system operators and planners. In this paper, issues pertaining to voltage management in the presence of multiple IPPs and voltage regulators are discussed based on years of utility experiences with high penetration of IPPs. A setpoint-free strategy is proposed for voltage...
The increased deployment of Distributed Energy Resources (DER) and their connection to the existing distribution networks influences the feeder voltage profiles and challenges the voltage control in distribution networks. Traditionally, On-Load Tap Changing (OLTC) transformers are the most common voltage control devices. In this paper, the problem of voltage rise mitigation in distribution networks...
Although 2.5D IC, in which chips are connected via the interposer, can increase circuit density and performance, power dissipation and thermal effect become serious concerns for 2.5D IC design. Previous researches only focus on the power and thermal management of a single chip. Therefore, in the existing 2.5D IC design flow, the designer has no idea on the power budget of each chip. Based on this...
This paper presents grey wolf optimization(GWO), which is a recently reported novel meta-heuristic optimizer, applied to optimize the damping controller parameters for a unified power flow controller connected to a single machine infinite bus power system for power oscillation damping. In this work the proposed GWO algorithm is compared with PSO algorithm in terms of convergence rate and computation...
This paper presents the solution for Optimal Reactive Power Dispatch problem(ORPD) using Gravitational Search Algorithm(GSA). ORPD is a Multi-Objective Optimization Problem which consists of the following objectives: Minimization of real power loss, Minimization of total voltage deviation and Minimization of voltage stability indicator. The Proposed GSA Algorithm is used to find the optimal settings...
This paper presents a study of different cost functions as well as different topologies of the optimizer that is PSO in order to reach an optimum PID for the AVR system. The obtained PID parameters strongly depend on the selected cost function and the ability of the optimizer to explore well the search space. Once the cost function and the optimizer parameters are set, the metaheuristic method can...
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