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Deregulation and restructuring of old centralized power system has brought a renaissance in the history of electric power system. It has unleashed an open competition among the utility service providers in the respective sector of electric power system, i.e. generation, transmission, and distribution. Also, it gives birth to the new concept of micro-grids, which is an epitome of larger grid, called...
Different photovoltaic (PV) technologies are being developed, tested and employed as small-scale on-site distributed generators for directly catering to the customer loads at the distribution voltage level. In this connection, extensive off-line and laboratory based research is also being performed for studying and comparing the PV technologies as well as for assessing their effectiveness for on-site...
This paper presents modeling and simulation of microturbine (MT) to analyze its load following performance as distributed energy resource (DER) with general as well as critical priority loads. The system comprises of a synchronous generator and a MT coupled to it. Simulations are carried out in islanded and grid-connected mode of the system to observe its behavior when supplying customerpsilas variable...
Anti-islanding protection schemes currently enforce the DGs to disconnect immediately for grid faults through loss of grid (LOG) protection system. This greatly reduces the benefits of DG deployment. For preventing disconnection of DGs during LOG, several islanding protection schemes are being developed. Their main objectives are to detect LOG and disconnect the DGs from the utility. This allows the...
Microgrid comprises an interconnection of various low voltage, small-scale distributed generators (DGs), energy storage devices and controllable loads interfaced through fast acting power electronic devices in an isolated remote area as islanding operation where conventional grid is not available. Combined heat and power (CHP) produced by DGs may be utilized in the local market making the microgrid...
Photovoltaic (PV) generation has now-a-days proved to be a cost-effective method for renewable power generation with minimum environmental impact. Due to environmental and economic benefits, PV is now being widely deployed as a distributed energy resources (DER) in distributed generation systems or microgrids. Extensive laboratory-based research and simulation studies are being performed for assessing...
This paper reports on the current UK scenario of islanded operation of active distribution networks with distributed generators (DGs). Different surveys indicate that the present scenario does not economically justify islanding operation of active distribution networks with DGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional operational...
The paper presents a step-by-step design methodology of an adaptive neuro-fuzzy inference system (ANFIS) based automatic voltage regulator (AVR) and power system stabilizer (PSS) and also demonstrates its performance in a single-machine-infinite-bus and a multi-machine power system through digital simulation. The design employs a zero and a first order Sugeno fuzzy model, whose parameters are tuned...
This paper presents the Z - source inverter for adjustable speed drive system. The Z - source inverter employs a unique impedance network couple with inverter main circuit. By controlling the shoot through duty cycle, the Z - source inverter system using MOSFETS provide ride - through capability during voltage sags, reduces line harmonics, improves power factor and high reliability, and extends output...
The strategic maintenance management (SMM) forms an integral part of the management process in a power utility industry in a deregulated market. Hence this is one of the most important and critical management areas in deregulated power market. High value equipment-intensive utility industries that successfully adopt SMM practice can reduce maintenance costs and improve productivity through superior...
Notice of Violation of IEEE Publication Principles"Fuzzy Logic Based Control of Variable Speed Induction Machine Wind Generation System," by K. Kaur, S. Chowdhury, S.P. Chowdhury, K.B. Mohanty, A. Domijan,in the Proceedings of the IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 pp.1-11, 20-24 July 2008After careful and...
In recent years, there is a strong trend towards generation of wind power across the globe in geographically suitable areas with a more or less stable wind velocity. However, the erratic nature of wind velocity as a power source is leading to problems of voltage/frequency oscillations and stability in wind energy conversion systems (WECS). Therefore, extensive research is being carried out for efficient...
The development of DGs will bring new changes to traditional power systems. Distributed generation has important consequences for the operation of the distribution networks. Appropriate size and location of distributed generation (DG) play a significant role in minimizing power losses in distribution systems. This paper represents techniques to minimize power losses and improves voltage stability...
Microturbines (MTs) are currently being deployed as small scale on-site distributed generators for microgrids and smart grids. This calls for extensive off-line and real-time research for analyzing the load following performance of MTs under islanded and grid-connected modes of operation at distribution voltage level. This paper presents development and simulation of MT models to analyze its load...
Microgrids comprise a network of small scale distributed energy resources (DERs) like fuel cells, micro turbines, PV arrays and wind turbine etc. and energy storage devices. Current deregulation regime is encouraging open competition amongst the small/medium utility service providers in providing quality and reliable 'clean' power to the customers at an economic rate. Economic power production is...
This paper presents a simulation study of operation and control of distributed generators (DGs) in power islands in Smart Grid environment. It examines the technical feasibility of DG islanding operation to exploit their services for improving electrical safety, security and quality of energy supply. The grid-connected DGs are initially operated at PQ mode and then switched to V-f mode to have full...
Text, graphics and half-tones are the major constituents of any document page. While half-tone can be characterised by its inherent intensity variation, text and graphics share common characteristics except difference in spatial distribution. The success of document image analysis systems depends on the proper segmentation. The success of document image analysis systems depends on the proper segmentation...
The enterprise asset management system forms an integral part of the management process in a utility businesses and hence there is significant role of EAM system to cope the Indian utility businesses in competitive market, and is one of the most critical areas. It deals with the management of total life cycle of asset in a utility businesses related to investment planning, construction, operation,...
In this paper, the authors propose a design methodology of adaptive neuro-fuzzy inference system (ANFIS) based automatic voltage regulator (AVR) using hybrid learning algorithm to improve the small-signal performance of power system. Here, a zero order Sugeno fuzzy model is considered, whose parameters are tuned off-line through hybrid learning algorithm. This algorithm is a combination of least square...
Reliability evaluation of electric power systems has traditionally been an integral part of planning and operation of electric power systems. The changes in the electric utility industry create a need for more realistic techniques for power system reliability evaluation. In this paper, we present a reliability analysis algorithm for radially operated, electrical distribution systems. The algorithm...
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