Energy Society General Meeting

Conference Information
Name: Energy Society General Meeting
Location: Minneapolis, United States
Date: 2010-7-25 - 2010-7-29

Latest articles from this conference

, , Janusz W. Bialek
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-8; doi:10.1109/pes.2010.5589606

Abstract:
Capacity credits are widely used to quantify the ability of different generating technologies to support demand. Most practical capacity credit calculations are based on detailed risk modelling, however a wide range of simplified approaches are also in use. This paper presents a critical review of these simplified approaches, ranging from annual peak calculations and probabilistic representations of wind, to closed-form expressions derived for small installed wind capacities. The principal themes are that simplified methods must retain the key features of the problem at hand, and that to be of interest simplified methods must either bring substantial computational advantages, or provide additional insight beyond that from a more detailed risk calculation.
Liang Zhou, Keyue Smedley
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-7; doi:10.1109/pes.2010.5590121

Abstract:
This paper describes the design of 1MVA 4.16kV Medium-Voltage motor drive using Hexagram inverter, and is compared to Cascaded H-bridge inverter motor drive system. System design and component selection is elaborated for motor drive system using both topologies. Power loss and reliability is also estimated for comparison purpose. Fault tolerant control is a feature for both motor drive system and is discussed and compared in detail. From the comparison, hexagram inverter appears more advantageous because of less DC bus storage requirement, higher reliability, higher efficiency and simple control.
, M. Kurrat
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-8; doi:10.1109/pes.2010.5588123

Abstract:
The interest in the integration of distributed generation into distribution systems has been increased in different countries all over the world as economic and environmental factors drive new technologies to be more efficient and less polluting than their earlier counterparts. As the penetration level of DG increases, the distribution system performance has to be analyzed in details. This work investigates the effects of Distributed Wind Generation (DWG) on voltage ranges, voltage profiles, and system MWh losses of a real MV distribution network. The availability to integrate a new wind mill into the system that already contains three wind mills is examined with respect to the technical conditions for generation connection to the MV networks introduced by German Energy and Water Federation. In the simulation, we used a one year measured wind data and simulated load profiles of the households which are connected to the LV side at each MV substation.
Jin Zhong, , Kai Liu
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-4; doi:10.1109/pes.2010.5589964

Abstract:
Demand side management has been one of the effective means of load shifting and peak-load shaving. In a system with distributed generations and distributed renewable energy sources, demand response can significantly improve the efficiency of electricity usage and energy saving. With the development of advance metering infrastructure, and information and communication technologies, demand side management will play an important role in smart grid. The power grid in China is highly interconnected by high voltage transmission links. The State Power Grid of China has made the strategy of developing smart grid. In this paper, we will introduce the situation of demand side management in China.
Bernardo Bezerra, Luiz Augusto Barroso, Marcelle Brito, Fernando Porrua, Bruno Flach, Mario Veiga Pereira
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-7; doi:10.1109/pes.2010.5589738

Abstract:
The storage capacity (or “regularization capacity”) of a hydro system refers essentially to its capability of transferring excess inflow energy from wet to dry seasons. The Brazilian hydro power system is formed by hundreds of reservoirs capable of multi-year storage capacity. Historically, this has been measured in the Brazilian Power System in terms of the duration of the critical period, which in turn is obtained from optimization models that calculate the firm energy (FE) of hydroelectric systems. These models, however, only represent the hydroelectric system explicitly and do not take into account the synergy between hydro and thermal plants. This synergy can be an important aspect in defining the storage capacity of the hydrothermal system. The objective of this article is: (i) to define a methodology for measuring the regularization capacity of a generation system; (ii) to analyze by this measure the current regularization capacity of the Brazilian system; and (iii) to analyze the impact of the development of large-scale run-of-the-river hydro plants that are in the pipeline to start commissioning in the next years.
Yi Zhang, Chris Mensah-Bonsu, Pranil Walke, Sandeep Arora, Jazmin Pierce
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-6; doi:10.1109/pes.2010.5589731

Abstract:
Photovoltaic (PV) solar generation is one of the most promising renewable generation technologies that can potentially help electric utility companies meet the Renewable Portfolio Standards (RPS) target. This paper presents potential transient over-voltage issues associated with PV solar generators, as identified in interconnection studies. The paper provides analysis of bus voltage response due to PV solar interconnection. Some of the factors affecting bus voltage profile such as PV solar generator model, size, inverter control parameters, electrical distance from the point of interconnection to the main system, and interconnection voltage level of the PV solar generator have been investigated. Simulation results from the coordination of PV solar and other reactive power resources, such as Static Var Compensators (SVC) and synchronous generators have also been analyzed.
Ashwani Kumar, Wenzhong Gao
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-8; doi:10.1109/pes.2010.5589634

Abstract:
Negotiation of secure bilateral transactions has become an important issue for better operation, planning and management of competitive electricity markets. In this paper, secure bilateral transactions have been determined with minimum deviations in economic generation schedule and real power losses for hybrid electricity markets. The generation pattern and real and reactive power loss has been obtained for both pool and bilateral demand. The secure bilateral transaction has also been determined minimizing only deviations from the scheduled transactions. The results obtained with different cases have been compared. AC Distribution Factors (ACDF) considering the impact of slack bus have been utilized for determining the line flows to consider the impact of bilateral contracts. The proposed approach has been applied on IEEE 24-bus reliability test system (RTS).
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-8; doi:10.1109/pes.2010.5589486

Abstract:
This paper describes the emergence of wind generation in the United States and describes the need for wind power data. It identifies the Department of Energy's Eastern Wind Integration and Transmission Study as a source of consistent, multiyear, geographically diverse, publically available wind power data. It provides a brief description of the wind data and how it was developed and it provides a statistical and graphical analysis of the wind data by State and Region. This paper is a summary of a longer report containing detailed charts, graphs and maps representing a statistical analysis of multi-year hourly wind and load data by State and Region. The complete report can be obtained by emailing the author at [email protected] with windstudy in the subject line.
Y. Yare, G. K. Venayagamoorthy
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-7; doi:10.1109/pes.2010.5589802

Abstract:
An optimal preventive generator maintenance scheduling (GMS) in a smart grid environment comprising wind-hydrothermal energy resources is presented in this paper. GMS problem is solved with the aim of maximizing economic benefits subject to satisfying system constraints. This GMS formulation becomes a challenging problem because of the variability and intermittency of wind speed and the incorporation of uncertainty in wind generation. The objective is to perform preventive GMS in such a manner that the annual generation cost is minimized, the annual cost saving is increased while all operating constraints are satisfied in the presence of uncertainty in wind generation. Discrete modified particle swarm optimization (MPSO-D) algorithm is used to solve this problem. The results presented on a typical Nigerian power system show the potential and benefits obtainable from increasing wind power penetration.
Atputharajah Arulampalam,
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century pp 1-8; doi:10.1109/pes.2010.5589415

Abstract:
This paper explains a fast acting Under Frequency Load Shedding and restoration scheme. This load shedding technique has an added advantage of selecting the amount of load which is to be dropped at a particular frequency threshold. The amount of load dropping is selected based on the rate of change of the frequency. Automatic restoration of loads is discussed with engaging a command signal from the system control centre. On/Off control of the power factor correction capacitor is also explained based on the magnitude of its terminal voltage. A three phase voltage vector Phase Lock Loop (PLL) is developed in EMTDC/PSCAD environment to measure the frequency of the power system. The PLL is tuned together with a filter to smooth the frequency measurement. This PLL measures the frequency online and based on phase angle deviation. Therefore it has a fast initial response. A load shedding factor is selected based on the rate of change of frequency between the specified thresholds. According to the load shedding factor the amount of load is selected. Load shedding and automatic load restoration operations are triggered accordingly when the frequency passes its relevant thresholds. The proposed distributed load shedding and restoration control technique was tested for IEEE 12 bus system at two different grid substations. The simulation results confirmed the fast, proper and smooth operations of the proposed technique.
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