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This paper develops a self-coherence method for detecting sustained oscillations using phasor measurement unit (PMU) data. Sustained oscillations decrease system performance and introduce potential reliability issues. Timely detection of the oscillations at an early stage provides the opportunity for taking remedial reaction. Using high-speed time-synchronized PMU data, this paper details a self-coherence...
This paper presents a data-mining model for fault-zone identification of a flexible ac transmission systems (FACTS)-based transmission line including a thyristor-controlled series compensator (TCSC) and unified power-flow controller (UPFC), using ensemble decision trees. Given the randomness in the ensemble of decision trees stacked inside the random forests model, it provides effective decision on...
California has adopted numerous policies to achieve a transition to reliance on sustainable, renewable energy sources. Ongoing changes in the supply resources and demand characteristics that are supported by the grid present both challenges and opportunities for meeting the challenges. However, certain barriers may currently inhibit these resources from achieving their potential.
This paper describes a probabilistic method based on a total risk index (probability times consequences) for assessing the number of spare breakers required for a group of similar high voltage breakers used in switching and transformer stations. The proposed method uses a Markov model for assessing the probability of failures and a bulk power system reliability program for evaluating failure consequences...
Maloperation of zone 3 element of distance relay during stressed system condition such as power swing, load encroachment or voltage stressed condition is one of the main reason of large disturbances in power systems. Improved protection technique for zone 3 can help to prevent such maloperation and thus more reliable power system can be envisaged. This paper proposes an algorithm that utilizes two...
This paper examines the extent of resource adequacy and the North American Bulk Power System's resilience to extreme weather events. Observations and lessons learned from the 2014 polar vortex event provide valuable insight to NERC's assessment of the upcoming and future winter seasons. In order to gain a better understanding of how extreme weather events can impact reliability in future winter seasons,...
This paper presents a method to assess the impact on system reliability of wind integration, considering coordinated operation with cascade hydropower. The seasonal characteristics of river flows and correlation amongst different wind farms are considered. Time sequential Monte Carlo simulation and Latin Hypercube Sampling techniques are used to preserve the characteristics of the time series of the...
In view of China's national conditions, this paper put forward a novel strategy for the maximization of renewable energy consumption, with collaborative controlling between the transmission network and the distribution network. This strategy took the local distribution network as a flexible and adjustable electric source, which played an active role in the consumption activity of the large-scale renewable...
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...
Recloser allocation and placement for a rural distribution system is investigated using a hierarchical framework. This paper proposed a high level recloser allocation scheme in addition to the low level recloser placement. Allocating reclosers to certain feeders without knowing the the exact circuit topology would be more efficient and desirable for the planning of utility companies. While the allocation...
The North American Electric Reliability Corporation (NERC) uses transmission equipment inventory and outage data to analyze outage trends to assist in identifying significant reliability risks to the bulk power system (BPS). These risk areas enable NERC to identify priority projects that provide coordinated and effective solutions to these identified risks to the reliability of the BPS. This paper...
This paper deals with the radial distribution system reconfiguration problem in a multi-objective scope, aiming to determine the optimal configuration by means of minimization of active power losses and several reliability indices. A novel way to calculate these indices under a mixed-integer linear programming (MILP) approach is provided. Afterwards, an efficient implementation of the e-constraint...
Resiliency with respect to extreme events, such as a major hurricane, is considered one of the key features of smart distribution systems by the U.S. Department of Energy (DOE). In this paper, approaches to resilient distribution systems are reviewed and analyzed. Three important measures to enhance resiliency, i.e., utilization of microgrids, distribution automation (DA), and vulnerability analysis,...
The communication system is the key element in an electric power system that supports its observability and controllability. Communication failures pose serious risks in electric power system operations. It is therefore crucial to study the adverse effects of communication system failures on power system operation. This is especially for wide-area monitoring, control and protection applications where...
With the increasing utilization of combined heat and power plants (CHP), electrical, gas, and thermal systems are becoming tightly integrated in the urban energy system (UES). However, the three systems are usually planned and operated separately, ignoring their interactions and coordination. To address this issue, the coupling point of different systems in the UES is described by the energy hub model...
This paper presents a methodology for developing an adequacy assessment of the generating and storing mix capacity in nearly-Zero Energy Residential Buildings (nZEB). The adequacy of a given generating and storing mix will be quantified by means of a set of reliability indices obtained by adapting the traditional reliability techniques employed in power systems. The analysis will use a Montecarlo...
This paper proposes an Approximate Dynamic Programming (ADP) based approach to evaluate the effective load carrying capability (ELCC) of high penetration renewable resources by solving the long-term security-constrained unit commitment (SCUC) problem with various uncertainties related to solar radiation, wind speed, and load level. Compared with traditional approaches, the proposed approach can assist...
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...
To accommodate the increasing wind energy with stochastic nature becomes a major issue on power system reliability. This paper proposes a methodology to characterize the spatiotemporal correlation of multiple wind farms. First, a hierarchical clustering method based on self-organizing maps is adopted to categorize the similar output patterns of several wind farms into joint states. Then the hidden...
This paper concerns the changing dynamics of planning and operations of the North American Bulk Power System (BPS) due to the confluence of trends in increasing Variable Energy Resources (VER), the retirement of conventional power plants and the current and future environmental regulations. The work presented is part of a larger effort by the North American Electric Reliability Corporation (NERC)...
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