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.
President Obama called for doubling the share of renewable energy in the nation's supply in three years. California has a renewable energy target of 33% percent by 2030. These bold commitments need transformational strategies to achieve them. Government policies to achieve the ultimate goal of carbon reduction in electric energy systems are to (i) increase renewable penetration, and to (ii) introduce...
Defining and evaluating operational equilibriums in real-time market, constrained by operation risks and economical biddings, is in the center of market operation and its enhancement. For example, in the two-settlement market design, reliability unit commitment is an important stage to bridge day-ahead market with Real-time system operation, which commits additional units to cover forecasted load...
This paper presents the results of studies which applies a multi-objective optimization function for the management of a solar based DC spacecraft network of the ring bus topology. The optimization function is utilized which features the objectives of optimizing the utilization of solar energy to continually meet the needs of the network while minimizing battery discharge current and current flows...
A confluence of industry drivers including increased deployment of renewable generation, cost for managing grid peak demands, and capital investments in grid infrastructure for reliability and smart grid initiatives are creating a new interest in electric energy storage systems. This paper will review the role and value of energy storage systems to the electric grid. It will present findings from...
The application of phasor technology is one of the most important next steps in the enhancement of power systems for smart grid technology. Phasor Measurement Unit (PMU) data is here and firmly established as vital to forensic studies. The electric utility industry is now moving at an accelerated pace with new initiatives to bring PMU data into the real-time fold. This panel paper highlights six areas...
Methods have previously been developed that improve the computational efficiency and convergence of Monte Carlo simulation (MCS) when computing the reliability indices of power systems. One of these techniques works by pruning the state space in such a manner that the MCS samples a state space that has a higher density of failure states than the original state space. This paper presents a new approach...
This paper describes the objectives of the Working Group (WG) on Test Systems for Economic Analysis of Power Systems, and presents the current activities of the WG as well as the future plan.
Pioneering efforts in showing how electricity energy storage can be a valuable asset in a Smart Grid Distribution System have been in process for the last few years. Several demonstration projects were completed to show how substation loading could be controlled and managed to delay upgrades. The next step was to show how the load deferral benefit could be combined with distribution circuit automation...
This paper describes an alternative method for grid expansion planning considering construction cost, probabilistic production cost, congestion cost and outage cost of a grid at a composite power system derived from a simulation model. In this paper, a heuristic scenario method is proposed to choose the least cost solution (scenario) among various scenarios considering candidate new lines. The characteristics...
Calculating the reliability of the power grid is difficult because it is made up of thousands of components and even though the failure mode of each component may be known, they are not independent of each other. Thus the models required to conduct reliability analysis are difficult to develop and are often complex enough to make the techniques for analysis very cumbersome. Usually controllers like...
Many technical areas in power systems require the simultaneous optimization of multiple and often conflicting objective functions with complicated non-linear constraints. The recent studies on multi-objective evolutionary computation methods have shown that the population-based stochastic algorithms are the most attractive approaches for this class of problems. Moreover, these methods can be efficiently...
This paper presents both quantitative and qualitative analysis of several polarization based measurements, which include frequency domain spectroscopy (FDS) and polarization depolarization current (PDC) measurements on four different field transformers. The X-Y model and the RC circuit model are mainly used in the analyses. In this study sequential FDS/PDC measurements on the same unit are used to...
This paper reviews six IVGTF tasks related to interconnection and operating requirements, and provides a report on their objectives, milestones and status. The three interconnection tasks are: Interconnection Requirements Enhancement (Task 1.3); Low Voltage Ride-Through (LVRT) Requirements (Task 1.7); and Balancing Authority (BA) Communications (Task 2.2). The three operating tasks are: Incorporating...
A key requirement of electric system operation is the ability of system operators to manage all types of variability and uncertainty. Integrating large-scale wind power into electric system operation increases variability and uncertainty that can impact supply and demand balance performance requirements. Many Independent System Operators (ISOs) are in the process of addressing these challenges. The...
We discuss the evolving role of communication and control for automatic load management in electric distribution systems. We start by reprising a description of the Athens project - one of the earliest deployed examples of automatic load management at consumers enabled by communication signals. We observe that the use of communication for such systems has gone through distinct phases in its evolution...
Component derating and reconfiguration for distribution reliability is proposed in this work. Under the budget constraints postponing predictive maintenance is seen in many utilities. This practice can cause adverse effects on the performance of the utility. This work proposes a technique to improve the system reliability by derating the component with time varying hazard rate. Derating of a component...
Nuclear power constitutes one of the main electricity production sources in several countries, e.g. in Sweden, with about half of today's electricity production. Driving forces for cost-efficiency have pushed the development of new methods for maintenance planning and optimization forward. Reliability Centered Asset Management (RCAM) is one of these new approaches, and maintenance optimization is...
The smart grid concept was introduced to the US utility industry by the Department of Energy (DOE). It was based on the visions of DOE's Grid 2030 and National Electric Delivery Technologies Roadmap. The debate over what constitutes a smart grid is still emerging. Nevertheless, we all agree that smart grid concept is complex and contains many interdisciplinary technologies and strategies. It is difficult...
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...
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...
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.