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This paper describes two new approaches to cascading failure analysis in power systems that can combine large amounts of data about cascading blackouts to produce information about the ways that cascades may propagate. In the first, we evaluate methods for representing cascading failure information in the form of a graph. We refer to these graphs as "dual graphs" because the vertices are...
In this paper, we present a methodology to incorporate the service offered by an aggregator of longer duration deferrable loads in the Unit Commitment (UC) optimization. The description of the deferrable demand we propose is accurate, yet not computationally intensive, and can be added to any type of UC optimization so that the ISO can use time-shift able loads as an additional dispatch able resource...
We validate the OPA cascading blackout simulation on a 1553 bus WECC network model by establishing OPA parameters from WECC data and comparing the blackout statistics obtained with OPA to historical WECC data.
We review early technologies and experiments in the 1980's for implementing demand response. We argue that while new smart grid technologies are cheaper and provide more functionality the barrier to demand response implementation at the retail level lies in the development of business models that will incentivize customer participation on the retail side and facilitate integration of the aggregate...
This paper presents findings on potential frequency-response-related impacts of increased variable renewable wind generation on North America's western interconnection by 2012. The assessment was conducted using commercially available, production-grade dynamic simulation tools and industry-developed system models, which include the amount of wind generation capacity that planners in the interconnection...
Various aspects of electricity generation resource allocation and planning are presented in this study on a hypothetical example of the generation resource pool of the state of Georgia augmented by a substantial amount of photovoltaic renewable generation, likely to happen in the next several years due to increased proliferation of PV, supported by both technological advances (higher efficiency cells)...
There have been many wind integration studies in recent years, and these efforts are expected to continue. Because power systems and data availability vary significantly, the results and methodologies used in these studies vary. This paper presents findings from international collaboration under IEAWIND Task 25 working towards Recommended Practices for Wind Integration studies. An overview of a complete...
The objective of this paper is to demonstrate 1) how adding storage capacity to a network can mitigate the variability of wind generation and increase the system benefits, and 2) how the stochastic characteristics of the wind generation affect the system benefits of storage capacity. Two types of storage are considered. One represents utility-scale storage that is collocated at the wind sites, and...
In this paper, an approach based on the concept of Model Predictive Control (MPC) is used to control transmission voltages and prevent long-term voltage instability. The MPC model is based on a linearized steady-state system model derived from power flow equations. Simulation results are presented for the case of Nordic32 test system.
Load control has always been a part of the repertoire of resources used by utilities to manage the balance between electric energy supply and demand. In recent years, advances in communications and control technology have enabled utilities to consider continuously controlling demand response to mitigate intermittent generation. This paper discusses a general method for load resource analysis that...
The incorporation of sophisticated sensing technology, notably the phasor measurement units (PMUs), offers tremendous opportunities toward real-time dynamic state monitoring in the smart grid. With a view to effectively exploiting the potentials of these advanced and non-conventional sensing resources, this paper is concerned with the design of PMU placement and sampling methodologies that optimize...
Given the importance of handling high levels of uncertainty from renewables in the unit commitment problem, there has been increased attention given to the use of stochastic programming methods. Since these are computationally very demanding, there is a need for new approximations. We propose to use a point forecast of energy from wind and loads, where the point forecast is chosen and adapted by simulation...
While organizations are making a considerable effort to leverage formal and informal control mechanisms (e.g., policies, procedures, organizational culture) to improve security, their impact and effectiveness is under scrutiny as employees seldom comply with information security procedures. Drawing upon Griffin and Neal's safety climate and performance model, we develop an information security climate...
This study investigated how external influences motivate senior management to commit to information system security (ISS) by examining the mediating role of senior management between external influences and organizational change. Neo-institutional theory was used to examine normative, mimetic, and coercive mechanisms that affect ISS assimilation in organizations. Findings show senior management beliefs...
Objectives: Determine the factors that predict whether a person who is unfriended on Facebook will avoid future contact with the person who unfriended them. Results: The research results show that six factors can predict whether a person will avoid future contact with the individual who unfriended them: whether the person discussed the event after it occurred, the emotional response to the unfriending,...
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