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.
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 a fast, practical maximum loading point (MLP) calculation method is presented. The calculation process is based on the properties of the normal vector to the feasibility boundary computed close to MLP, which is calculated through a load flow method with step size optimization (LFSSO). Moreover, a practical procedure is added to the overall calculation process to include the operator's...
This paper presented a new approach to address the frequently encountered Standing Phase Angle (SPA) reduction problem during a power system restoration process. The proposed method was based on a modified Genetic Algorithm (GA). The problem of the SPA reduction was modeled as a mixed discrete-continuous optimization problem with various constraints. The objective function that needed to be minimized...
This paper details the investigation of a large frequency excursion of 2.28 Hz, experienced in the New Zealand power system on 1st August 2009 when the HVDC interconnector tripped, resulting in a power deficiency in South Island power system. A major portion of the spinning reserve to cover for this contingent event was provided by generating units operated in Tail Water Depressed (TWD) mode which...
This paper presents a new algorithm, Function Optimisation by Reinforcement Learning (FORL), to solve large-scale and complex function optimisation problems, in particular for those in a high-dimensional space. FORL undertakes the dimensional search in sequence, in contrast to evolutionary algorithms (EAs) which are based on the population-based search, and has the ability of memory of history incorporated...
This paper presents a model which can be used to simulate the load acceptance behavior of a diesel generating set. Unlike traditional thermal plants, generating sets (gen-sets) are often expected to undergo large rapid changes in load. A gen-set with a low inertia will naturally be more susceptible to changes in speed. This problem is compounded with the introduction of turbocharged engines. Although...
Demand Response (DR) provides mechanisms and incentives for utilities, business and residential customers to reduce energy use (and costs) during time of peak demand or when system reliability is at risk. DR is considered by CPUC, DOE and FERC as one of high-priority Smart-Grid Functionalities. FERC has developed a national action plan on demand response, recognizing that a more extensive use of demand...
Synchronized measurements became recently an affordable tool ready to be implemented not only at transmission system level but also at distribution level, mostly in conjunction with the applicability of the smart grid approach. As a preliminary step of introducing PMUs on a larger scale, extensive measurements campaigns, primarily dedicated to power quality purposes, were conducted within medium and...
This paper studies the short-term grid voltage stability of double cage induction generators in fixed speed wind turbines. The performed analysis shows that for voltage stability studies of fixed speed wind turbines with induction generators (either single or double cage), the mechanical rotor turbine model is preferable as a detailed aerodynamic model. Simulations of the suggested modeling approaches...
Wind speed variability generates the main challenges for grid integration of wind power. Worldwide, requirements governing generator connection to the transmission grid evolve as the modern energy industry continues to develop. With increased wind power penetration, wind power plants are required to provide grid support and control actions similar to conventional power plants. Dedicated control systems...
This paper concerns the challenge of teaching future energy systems using concepts familiar to engineering students. It is stressed that unless operating and design problems are formulated in a way understandable to those who do not specialize in electric power systems it becomes very difficult to identify what may be the roadblocks to innovation and better performance of the evolving energy systems...
A variety of wind forecasting services are available from multiple providers. Some system operators are even contemplating the use of an ensemble of multiple forecasting services, as is done by some European system operators, since improved wind forecasting has obvious benefits. But even so, the issues around how we use the forecasts to address operational problems are still evolving and we have much...
This paper proposes a new method for probabilistic transmission network expansion planning with Controlled Non-dominated Sorting Genetic Algorithm (CNSGA-II) of multi-objective meta-heuristics (MOMH). Recently, power networks increase the degree of uncertainties due to new environment of power network liberations, the emergence of renewable energy, etc. As a result, the importance of improving power...
In an effort to protect the environment despite the projected development of the electrical power system, the European community is focusing on a significant increase in the installed wind power capacity up to the level of 300 GW by the year 2030 throughout Europe. Most of the planned installations - about 150 GW - are going to be realized in the offshore sector, a large part of which will be located...
This paper addresses the vulnerability analysis of the electric grid under terrorist threat. This problem is formulated as a mixed-integer non-linear bilevel program. In the upper-level optimization, the terrorist agent maximizes the damage caused in the power system, which is measured in terms of the level of system load shed. On the other hand, in the lower-level optimization, the system operator...
Many on-line and off-line methods have been advanced by researchers for identifying small signal modes in power systems. Identification methods employed off-line can also be used outside of the traditional on-line prediction scenarios. These methods can assist in the design of damping mitigation devices for critical small signal mode events. In this paper, several scenarios will be studied to determine...
The paper focuses on the importance of demand management and load control for the development of electric power system and the provision of electricity supply reliability. The potential of controllable loads in Russia is estimated including electric vehicle transport, climate systems, household, industrial and agricultural consumers. The potential and optimal volumes of perspective controllable loads...
Reliability of distribution systems is an important issue in power engineering for both utilities and customers. Power distribution reliability is closely related to individual component reliability. In this paper, the reliability as measured by certain count indices, mainly the System Average Interruption Duration Index (SAIDI) and the System Average Interruption Frequency Index (SAIFI), is quantified...
Use of high temperature conductors is being considered by more and more electric utilities as a means to increase transmission line capacity. This has raised questions regarding the effect of these increased temperatures on the performance of all components attached to the conductor, including the insulators. This paper presents the results of laboratory studies of several suspension insulator assemblies...
This paper explores a new technique of load modeling and estimation on distribution systems. With the emerging AMI technology real-time data about customer loads will be available and hence an estimate of loads on the distribution feeder can be made for system monitoring and control. With this data, a load model predicting the real-time load variations can be made. This paper elaborates the statistical...
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.