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.
Phasor measurement units (PMUs) provide the basis for synchrophasor measurements, which are good data sources for capturing power system dynamic behavior. The recently published IEEE Standard C37.118.1-2011 characterizes the dynamic performance of synchrophasor measurements with two performance class filters: P-class and M-class. Practical implementation of a PMU to meet all dynamic requirements is...
In Part II, we develop an efficient method for generating test cases that ensures early detection of design error. The proposed method uses Particle Swarm Optimization technique for the same. Also, we propose a sensitivity based approach to rectify design errors. The proposed verification technique is applied on standard IEEE test systems and it is seen that it is possible to achieve better accuracy...
This paper presents a novel fault current management (FCM) technique for radial distribution systems with embedded inverter-based distributed generators (IB-DGs). At the point of connection to a power system, many distributed generators (DGs) require power electronic (PE) interfaces, which are normally idle during faults. The proposed FCM method employs these PE interfaces for control of the fault...
Using production-cost model (PLEXOS), we simulate the Western Interchange (WECC) at several levels of the yearly renewable energy (RE) generation, between 13% and 40% of the total load for the year. We look at the overall energy exchange between a region and the rest of the system (net interchange, NI), and find it useful to examine separately (i) (time-)variable and (ii) year-average components of...
The integration of increasing amounts of intermittent renewable generation whose reliability contributions are significantly different than those of the historically dispatchable thermal generating units is important to future electric generation planning. With relatively small amounts of intermittent generation, reliability impacts may not be detectable; however, as renewable integration goals continue...
The operation and control of power grids will increasingly rely on data. A high-speed, reliable, flexible and secure data architecture is the prerequisite of the next-generation power grid. This paper summarizes the challenges in collecting and utilizing power grid data, and then provides reference data architecture for future power grids. Based on the data architecture deployment, related research...
The distribution generation and demand response remuneration practices, used by most aggregation entities, considers simple characteristics as the type of resource. This evaluation may cause a non optimized tariff definition in most cases. For this paper, a Virtual Power Player as aggregator is considered, which is able to make clusters of both producers and consumers. The proposed methodology defines...
This paper describes enhancements to ATC's cascading study criteria and the implementation of a fast automated process using POM/OPM software for conducting comprehensive steady state multiple element contingency screening and cascading analysis, finding mitigations to restore the system to be within emergency and/or normal performance limits, and automatically tabulating significant results and summaries...
Conservation voltage reduction (CVR) is a technique for lowering energy consumption by reducing customer voltages while remaining within specified service voltage ranges. It is widely used by utilities and advocated by some regulatory bodies. However, in order to lower customer voltages while keeping them within standard ranges, it is important to know where the voltage starts. Available models of...
In order to support sustainability, a large variety of secondary batteries are necessary, each of which is a battery pack composed of many cells connected in series and parallel. Such battery packs must have connections suitable to its application; however, optimality cannot be claimed deterministically in the design stage, since battery behavior heavily depends on the environment of usage and the...
New winding configurations for mutually coupled salient pole switched reluctance machines (MCSRMs) have been proposed that enables the application of three-phase standard inverters for variable speed drives. The proposed topologies comprise phase windings carrying balanced three phase currents from standard inverters along with DC excitation coils in the stator slots. Both concentrated and distributed...
The adoption of on-load tap changer (OLTC)-fitted transformers in low voltage (LV) networks is increasingly being considered to mitigate voltage issues resulting from high penetrations of photovoltaic (PV) systems. However, depending on the corresponding voltage control strategy, tap operations can be significant, accelerating the ageing of the OLTC. This work assesses the performance of different...
An integrated portfolio of wide-area real-time reliability tools is addressing one of the major recommendations from the most recent blackouts in North America's Eastern and Western interconnections: The lack of common, simultaneous, adequate and accurate reliability information during major disturbances. The functional specifications for the tools were defined through guidance provided by NERC reliability...
The traditional ac power system is challenged by the increased amount of distributed energy resources. Enormous changes and investments are necessary in order to achieve an ac smart grid capable of coping with the challenges introduced. In dc, solutions seem to be more straightforward since most of the distributed energy sources and most of the loads connected to the low voltage grid operate with...
Adopting on-load tap changer (OLTC)-fitted transformers in low voltage (LV) networks can be a potential solution to counteract voltage rise caused by high penetrations of residential photovoltaic (PV) systems. To efficiently control the OLTC network monitoring might be considered. This work assesses the performance of a proposed OLTC control logic considering different remote monitoring schemes and...
This paper presents simulation results from a real case study of a medium scale photovoltaic (PV) system integrated into an 11kV distribution network. The investigated system is a semi-rural part of an existing distribution network in Queensland, Australia with planned investments of more than 3MWp PV installation. The studied case is very interesting because of planned high penetration of PV power...
This paper presents a comprehensive, practical approach to identify and analyze the effects of extreme contingencies that might lead to widespread power disruptions and cascading. Modern power systems are normally designed to withstand n-1 and credible n-2 outages. The ability of a system to survive extreme contingencies and major disturbances has not been comprehensively addressed by system planners...
Low Voltage DC (LVDC) distribution systems have the potential to be considered as an efficient platform for facilitating the connection of more distributed energy resources. The applications of LVDC are still at an early stage due to the lack of mature experience and standards. Over and above, the protection challenges that are presented by integrating DC installations in existing AC systems are one...
Solar photovoltaic systems continue to expand across the United States due to cost competitiveness, Federal and state incentives, and Renewable Portfolio Standards (RPSs). Transmission Planners and Operators must ensure high levels of grid reliability as increasing penetration levels further affect system variability and generation intermittency. A Time Step Simulation (TSS) is developed to study...
During decades of interconnected operation of power systems, frequency control standards have evolved to fairly share the benefits of interconnection and tie-line bias control among Balancing Authorities (BAs). The new draft standards of North American Electric Reliability Council (NERC) define a frequency-dependent Balancing Authority ACE Limit (BAAL) within which BAs must control their Area Control...
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.