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Defining and evaluating operational equilibriums in real-time market, constrained by operation risks and economical biddings, is in the center of market operation and its enhancement. For example, in the two-settlement market design, reliability unit commitment is an important stage to bridge day-ahead market with Real-time system operation, which commits additional units to cover forecasted load...
This paper describes the objectives of the Working Group (WG) on Test Systems for Economic Analysis of Power Systems, and presents the current activities of the WG as well as the future plan.
Summary form only given: After a power system blackout, system restoration is a critical task for the dispatchers. With the stringent requirements for faster and more efficient system restoration, an objective transmission restoration path selection procedure, including the option to check constraints, may be more responsive in handling unexpected system changes and in providing directed guidance...
Distribution Systems traditionally have a tree-like structure with several branches. They supply loads that vary through the day and as a result, some branches are loaded more than others are. By reconfiguring the system, loads from the overloaded branches may be moved to under-loaded branches. Consequently, loads in the branches can be balanced so that the real power losses are reduced and the voltage...
This panel paper presents some outlines on the energy management of electric power microgrids with hybrid components. The hybrid nature of the microgrid is attributed to renewable energy sourced generation, energy storage, schedulable loads and information enabling technology such as smart meters. The panel paper and the accompanying presentation aim to describe the electric energy management visà-vis...
From the early days of Edison and Westinghouse, the educational institutions have played catch up with the developments in the electric energy industry. In those early years, the terms Electrical Engineering and Power Systems Engineering were used synonymously. Over the past two decades, the number of colleges and universities offering graduate degree programs in Electric Power Systems has dwindled,...
This paper aims to give an overview on main PQ development in Europe. It focuses basically on recent legislative, regulatory, standardization, voltage quality monitoring and education initiatives summarizing the latest outcomes.
In this paper, variable weight theory and set pair analysis (SPA) theory are applied to comprehensive evaluation of power quality. Among existing comprehensive evaluation methods of power quality, the problems about index uncertainty and imbalance case are less considered. The application of variable weight SPA, for ensuring identical discrepancy contrary (IDC) of unsure system, effectively reduces...
This work presents the basis of a new approach for fault diagnosis in Electrical Distribution Systems (EDS). This approach aims to classify different types of faults by means of the factor named as Negative Sequence Factor (F2). This factor is calculated from post-fault negative sequence and pre-fault positive sequence currents using Thévenin equivalents. Series, shunt and simultaneous faults with...
This paper shows an operation area consideration of a torque and speed region of a 50kW Switched Reluctance Motor (SRM) for Hybrid Electric Vehicle (HEV) applications. Increasing a number of turns in stator windings is effective to reduce phase current of SRM at low rotational speed, however, motor output power falls significantly at high speed because of an increased back emf. A continuous current...
The controller for Archimedes wave swing (AWS) based wave energy conversion (WEC) system is designed in this paper. Based on the model of the AWS based WEC system in the d-q frame of reference, the control strategy of the WEC system under the irregular wave is derived. The AWS based WEC is regulated to be in resonance with the wave by the stiffness control of the linear permanent magnet generator,...
The increase of the penetration of the stochastic renewable generation required new strategies by the power system operation. On the one hand the transmission capacity of the power system must by reserved for the unplanned green energy transients which occur sometimes for a long distance and requires operational coordination between different TSO. On the other hand some new indicators for the power...
With increasing penetration of communication and control technologies that enable “smart grid” functionalities, an infrastructure is rapidly evolving that will support the formation of networks of sources and loads that are amorphous and dynamic, completely unlike any power system network that is extant today. Researchers are already conceiving microgrids and nanogrids that are completely autonomous,...
Considering the recent developing trends of electric power enterprise towards digitalization and informationization, EAI is adopted in this paper to solve the “information island” problem. Firstly the evolution process of traditional EAI solutions is reviewed. Then A SOA based EAI is investigated as an important method to develop a digital grid for enterprise business operation and control. Then the...
Among various types of battery energy storage systems (BESSs), NAS battery is the most promising products. NAS battery is a commercial product implemented widely in the world. The first purpose of BESS was improvement of load factors. The second purpose is improvement of power quality, especially against voltage-sag. The recent interest is oriented to utilize BESS to mitigate the intermittency of...
Microgeneration (MG) comes in various forms, ranging from solar photovoltaic (PV), wind turbines, small hydro to solar water heating and among others. The governments in Europe see MG as a real alternative in reducing carbon emission and improving supply efficiency and security. Incentives for MGs are therefore on the rise, along with the number of units connected to the HV/LV distribution networks...
This paper provides an overview of on-going transmission development to meet environmental policies in the State of California. Currently, load serving entities in the State of California are required to procure 20 percent of its energy with renewable generation by 2010 and the Governor's Executive Order sets a target of 33 percent Renewable Portfolio Standard by 2020. To meet this target by 2020,...
With the increase of distributed generation (DG) connections, circuit overload and voltage violation will occur for some distribution networks. However, building new lines to accommodate DG may pay high monetary and environment costs. A new procedure of distribution network reinforcement taking the active management means into consideration is proposed in this paper. Models and solution methods for...
This paper proposes an information fusion method for diagnosis. Multilayer structure of information fusion included data proposing, feature extraction and decision making, is constructed for dealing with the objects such as current, voltage and wave, etc. A Petri-network and a fault matching method of WAMS data are used in characteristic fusion. The application of this fame in the simulation resolves...
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