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.
When conservation of voltage is applied aiming to the reduction in energy consumptions by lowering the voltage in such an effective and controlled manner so that it does not violate ANSI Standard C84 voltage limits known as Conservation of Voltage Reduction (CVR). However enabling of CVR with traditional methods is limited with voltage reduction range and without taking account of customer end voltage...
This paper presents the concept of the prediction of phasor measurement unit (PMU) data, which are unavailable due to one reason or another at the central control room, using the 3-layered feedforward back-propagation neural network (BPNN). BPNN are used to determine hidden pattern in a process, using the historical data of that process. Work presented in this paper shows that, change in the voltage...
Secured and uninterrupted operation of the power systems has become a great challenge. The load on the practical power systems vary through the day, month and year. Thus making the task of the power system engineers much more complicated. In this paper, a novel index, namely, composite severity contingency distribution index (CSCDI) has been proposed in order to find the severe-most line of the system...
The share of agriculture in total electricity consumption was 23% in 2011, while revenues from agriculture were only 7% of the total. This needs urgent attention. One way is to do the segregation of agricultural load. This paper attempts to formulate a loss minimization scheme that will be applicable to a segregated non-agricultural feeder and can be served as a collateral program. In the above paper...
This paper proposes an efficient hybrid technique for probabilistic load flow study. A mixture of correlated Gaussian and non-Gaussian as well as discrete distributions is considered for input random variables. Distributions of desired random variables pertaining to the input random variables are found to be multimodal. Analysis using Gaussian mixture approximation is promising in this context, but...
From last few decades, the frequent occurrence of the voltage collapse has attracted more and more attention. Voltage collapse is the system instability, usually, associated with the shortage of reactive power at the load end involving the entire power systems. The most effective method to counter voltage collapse is to find out the possible locations where voltage collapse may occur i.e. to find...
Concerns of power quality problems, especially for sensitive loads are well known. The integration of microgrid and renewable energy sources with power converters is propounding this problem. This challenges us to know more about their control techniques so as to optimize their performance, both in terms of time and memory. This paper is concerned to analyze the formulation of three control theories...
Polarization Depolarization Current method of dielectric testing is popularly used by the utilities for condition assessment of the insulation of power transformers. Test temperature is an important factor that affects the polarization depolarization current data measured. In this work the effect of test temperature in condition assessment of cellulosic part of oil-paper insulation using polarization...
Induction motor loads constitutes the major portion of the various types of the loads in any of the power grid across the world. Various control modes of induction motor along with its speed variability based on the slip provides its usage for versatile application. However, these induction motor based loads are affected by the voltage observed at their node during the constant torque mode due to...
Reactive power dispatch problem is one of the important issues of the power system in the operation and control. The Optimal Reactive Power Dispatch Problem is the minimization of active power loss in the power system by varying different system control variables, i.e. generator bus voltages or its reactive power output, transformer taps setting, shunt Var compensator etc. The minimization of active...
Development and implementation of a control scheme for wind farms based on Permanent Magnet Synchronous Generators (PMSGs) connected to a single HVDC-VSC converter is the main objective of this paper. The presented scheme is based on computing the optimal frequency at which the power converter must work to extract the maximum power from parallel operated PMSG based windmills. The power extraction...
The objective of this paper is to make a comparative study on different phasor and frequency measurement algorithms available for power systems. The dynamic nature of the power system signals has made the estimation of frequency and phasors difficult. Over the years, many digital algorithms have been developed to overcome these difficulties and to provide accurate real-time frequency and phasor measurements...
Renewable sources suffer from intermittency and variability in time and amount of power, causing problems of integration with the grid. Field experience in deregulated systems has occasionally shown that increase of renewable injections such as wind, solar etc. to the main grid depresses voltages at the point of interconnection. We pose the question: is it possible to analytically predict such behaviour...
This paper presents implementation of a novel algorithm called Fish Electrolocation Optimization (FEO) on optimal DG and capacitor placement to enhance reliability economically in a radial distribution system. Total cost comprising of power interruption cost, real power loss cost, capacitor installation cost and DG running cost has been minimized. Distribution system reliability indices like SAIFI,...
A decentralized paradigm has several advantages over centralized paradigm which offers quick, robust and self-reliable system operations. Hence, this paper proposes a novel approach towards decentralized load flow solution of power system. Agent based concept is used to realize the proposed framework which uses DC load flow calculations. A single Bus Agent (BA) is designed which incorporates two behaviours,...
The identification and operation of islands in the presence of Distributed Generation (DG) Units has become challenging. The non-detection of islanding could lead to a cascaded failure of the system. This paper proposed an Improved Islanding Detection Technique (IIDT) for early and accurate identification of the bus for islanding in the presence of multiple DG units. In the islands identified thus,...
The integration of renewable energy sources into power systems changes the transient and fault current characteristics of the conventional grid. The variation in the system response during grid disturbance like sudden load changes or fault would cause the failure of traditional protection and control. Since the operating condition of DFIG depends on the characteristics of the grid and its control,...
It is important to handle the transmission network expansion planning problem under restructured power systems to allow fair competition in the system. A scenario-based two-stage Transmission Network Expansion Planning (TNEP) is presented in the paper and solved using a meta-heuristic algorithm. Various scenarios, for market-driven power flow patterns is considered in a 6-bus Garver Test System, and...
The simultaneous occurrence of power quality (PQ) disturbances is increased in recent times, and the detection of combined disturbances has become a pressing concern. A new model based on support vector machine (SVM) for classification of single and combined PQ disturbances is proposed in this paper. The classification of k disturbances with any of the conventional multiclass SVM approaches demands...
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.