The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The stochastic nature of wind power output makes the integration of high penetration of wind into the power grid a real challenge. In this work, the uncertainty associated with the wind power output for a given wind power forecast is modeled using conditional probability density functions (pdf). Two pdf functions are considered: Beta and extreme value. Simulation results show that, in general, the...
Electrical systems are highly interrelated. A disturbance in one utility of a region can influence the stability of other utilities. Proper monitoring and critical information exchange in real time is the only solution to prevent an outage in this highly vulnerable system. But, the disparity in protocols used in the power industry and lack of infrastructure of information exchange are proving to be...
The estimated number of lightning flashes to a transmission line is the vital parameter to evaluate the lightning performance precisely. An experimental study on the factors that have an impact on the number of lightning flashes to transmission lines has been performed at the MSU High Voltage Laboratory. Models of typical transmission lines with different configurations have been tested under both...
Bangladesh is a developing country with large population. Only 32% of the total population has access to grid electricity. It is extremely difficult to extend high-tension transmission lines to these areas as some of the places are separated from the mainland and from each other by wide rivers, creeks and hills. Renewable energy is considered to be the right choice for providing clean energy to these...
The suitability of energy storage systems for transmission, distribution and wind farm applications are studies here. This review on the available energy storage systems (ESS) is performed considering several criteria. Efforts are made to investigate solutions that meet all the power system requirements. These solutions are used to design an intelligent energy storage system (IESS).
Since the mid-1990s, large scale end-use electricity consumption studies for the residential sector have nearly disappeared. This dirge of information has introduced additional difficulty for researchers seeking to model and analyze loads at the distribution level. In lieu of using collected data, some researchers have developed load models to serve as the source of end-use information. An alternative...
Distributed generation (DG) penetration is increasing due to customer demand for clean renewable energy. Though many studies have addressed issues regarding DG, transient stability issues have been largely neglected. In this paper the interactions of different DG sources with respect to transient stability is examined. A benchmark distribution network and synchronous and induction generators are modeled...
Rising gas prices, carbon constraints, fuel economy standards, and the desire for energy independence are driving the development of PHEV which are expected to achieve the equivalent of 100 miles per gallon of gasoline. If they achieve significant market potential, they will have a huge impact on the electric industry, increasing load by an amount which could put the grid at risk. The challenges faced...
The traditional Franklin Rod is an inexpensive and efficient method of lightning protection whereas the non-traditional or non-conventional lightning protection devices are expensive and claim to offer better protection compared to Franklin Rod. Many researchers have done substantial amount of work to evaluate the performance of non-conventional lightning protection devices. Lack of systematic study...
To avoid unexpected equipment failures and obtain higher accuracy in diagnostic and prognostic for the health condition of a motor, efficient and comprehensive data collecting, monitoring, and control play an important role to improve the system more reliable and effective. A novel wireless data collection for health monitoring system of electric machine based on wireless sensor network (ZigBee™/IEEE802...
The modern power system consists of an integrated, complex, dynamic system. This dynamic system and its power system operation and control needs to be analyzed with numerical simulation. Among many components in the power system operation, load model is one of the least known models. The commonly used models include the ZIP load model and exponential load model. Load parameter representation for dynamic...
The implementation of Smart Grids will fundamentally change the approach of assessing and mitigating system voltage deficiencies on an electric distribution system. Many distribution companies have historically indentified feeder level voltage deficiencies utilizing a reactive approach that relies upon customer complaints. The monitoring capabilities of a Smart Grid will allow utilities to proactively...
This paper presents a classification faults in electrical power systems. To improve the electric power quality, sources of disturbances must be known and controlled. Power quality disturbance waveform recognition is often troublesome because it involves a broad range of disturbance categories or classes. This is a study of fault events classification using wavelet transformation and expert rule base...
Effective control of spinning reserve (SR) is important for economic advanced dispatch (AD). In the conventional AD methods, the SR allocation based on deterministic criterion is hard to keep system response risk within a specified level. So, in this paper, expected demand not supplied (EDNS) is introduced to AD as an index for response risk, and a given EDNS limit is treated as a constraint of AD...
Phasor measurement units (PMU) are rapidly populating the substations and enabling improvements for various network applications, one of which is the state estimator. Installation of large numbers of PMUs which may be required for network observability must be preceeded by a detailed analysis of optimal location and type of these devices. Since PMUs may have different number of channels depending...
Security constrained economic dispatch (SCED) is commonly used in Independent System Operators (ISO). The operating costs are minimized under the transmission network constraints in SCED. The increasing environment awareness and the implement of Kyoto Protocol are changing the operation of power system. The SCED will be transformed from single objective economic problem to multi-objective problem...
An increasing number of sensitive electronic devices and facilities are being installed on distribution and transmission systems. These are not just pumps, but large manufacturing plants, even bulk food producing facilities have sensitive equipment. Many facilities require distribution and/or transmission backup power supply. System reliability has become a significant issue. Intermittent green energy...
A future perspective micro-grid with a medium-term prediction for 2030 is described. The present state of intentional islanding is briefly reviewed. Distributed Generators (DGs) and Electric Vehicles (EVs) to sustain the local distribution system in the event of interruption of supply are considered. Projections regarding their availability are presented and different penetration scenarios are addressed...
This paper describes the occurrence of flashover on insulator surface instead of between the arc horn gap on unbalance insulation double circuit high voltage transmission line, whose lower insulation side has arc horn attach at each insulator strings. Front time and amplitude of lightning strokes and interception point of lightning flash were the main factors of this study. The simulations were performed...
This paper presents impacts of photovoltaic power generation 2 MW on very long distribution line. Therefore, the size of distributed generation has to be carefully considered when it installed on very long distribution system. This study considered following topics: power quality, reliability, stability and voltage profile of very long distribution networks. The simulation results have shown that...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.