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This paper presents a new modeling framework for analysis of impact and scheduling of price-responsive as well as controllable loads in a three-phase unbalanced distribution system. The price-responsive loads are assumed to be linearly or exponentially dependent on price, i.e., demand reduces as price increases and vice versa. The effect of such uncontrolled price-responsive loads on the distribution...
This paper employs impedance-model-based frequency domain analysis to detect subsynchronous resonances (SSR) in Type 3 wind farms with Thyristor Controlled Series Capacitor (TCSC). The contributions of this paper are (i) the derivation of dynamic phasor based TCSC impedance model and (ii) the application of such impedance model in Type 3 wind energy systems for SSR analysis. Impedance models for TCSC...
The DC power flow model is in widespread utilization in electricity-market applications and contingency analysis. The presented versions of this model can be classified into two categories: state-dependent, or Hot-Start, models and state-independent, or Cold-Start, models. A reasonable accuracy is reported in the literature regarding Hot-Start models as they take into account branch losses and bus...
The impact of increasing penetration of converter control-based generators (CCBGs) in a large-scale power system is assessed through a model based small signal stability analysis. Three test bed cases for the years 2010, 2020, and 2022 of the Western Electricity Coordinating Council (WECC)in the United States are used for the analysis. Increasing penetration of wind-based Type 3 and wind-based Type...
This paper introduces an enhanced equivalent model of the half-bridge symmetrical monopole Modular Multilevel Converter (MMC) topology for the analyses of the electromagnetic transients. As compared with the existing MMC models, the proposed model reduces the simulation computational time without compromising accuracy, and contrary to the existing models, it provides accurate representation of the...
This paper presents a novel modeling framework for the analysis of Plug-in Electric Vehicle (PEV) charging in unbalanced, residential, distribution systems. A Smart Distribution Power Flow (SDPF) framework is proposed to determine the controlled or smart charging schedules and hence address the shortcomings of uncontrolled charging. The effect of peak-demand constraint imposed by the Local Distribution...
A nonlinear averaged model of MMCs is proposed that considers the SM capacitor insertion dynamics and takes into account the current control loops that follow widely used vector control approach. A stability analysis framework is presented by exploiting the linear time-periodic (LTP) nature of this system. The averaged model, developed in MATLAB/Simulink, is benchmarked against a detailed model in...
With the development of smart grid technology, FACTS devices, such as SVC and STATCOM, are widely applied in practice. Since the FACTS devices possess fast dynamic response characteristics, they can provide effective support to power systems stability even during the transient process after severe contingencies. It is helpful to take into account the transient process stability constraints into reactive...
The objective of this paper is to present a real-time co-simulation platform for analyzing electric power grid operation, taking into account integrated communication systems. This paper discusses how a co-simulation platform can be set up using OPNET and OPAL-RT as communication and power system simulators, respectively. A simplified distribution automation case study is demonstrated to show how...
This paper describes a methodology and an automated process to implement node-breaker capabilities for representing major stations within Con Edison's footprint. This process creates a “hybrid” power flow model of Con Edison's system such that the user-defined stations are represented using the node-breaker model and the rest of the system is modeled using bus-branch representation. The process is...
Demand Response (DR) is a promising solution to deal with supply/demand imbalances in the power systems. To appreciate the availability of DR, it is important to include end user behavior in the analysis. In this paper, a model that can generate representative occupancy profiles in single office rooms is presented. The used method is non-homogeneous Markov chain modeling, along with exploratory data...
A hybrid simulation/measurement-based framework for online dynamic security assessment (DSA) is proposed in this work. It combines the strengths and features of simulation-based and measurement-based approaches to develop a tool that integrates the results and provides real-time situational awareness on available operating margins against major stability problems. High performance computing capability...
The traveling wave protection performance of traditional DC transmission line can be influenced by fault conditions, so this paper proposes a traveling wave based directional pilot protection method. Analysis shows, for an internal DC line fault, that the forward traveling wave is less than the backward traveling wave at two ends of the proposed line within a short time of post-fault; but in the case...
The Static Security Assessment of power system is affected by the uncertainty of the power flow distribution introduced by renewable resources. In this paper, a fast contingency selection approach considering load and generation uncertainties is proposed. Firstly, a linearized interval power flow algorithm is developed for post-contingency simulation. Then, an interval number comparison method based...
This paper develops a test bed based on the Northeastern Power Coordinating Council (NPCC) 48-machine, 140-bus power system model for simulating cascading failures. Then, the paper uses the test bed to demonstrate the interaction model recently proposed by [1] for analyzing cascading failures, identifying key linkages between component failures, and predict propagation of failures. For the NPCC test...
This paper identifies the issues of using the bus/branch model for operations studies for current hour, next hour and future hours. Need for node/breaker model for contingency analysis is discussed. Major improvements needed to bus/branch model for contingency analysis in the area of contingency definition and contingency analysis is presented. Need to model Remedial Action Schemes (RAS) independent...
As the electric vehicle (EV) is becoming a significant component of the loads, an accurate and valid model for the EV charging demand is the key to enable accurate load forecasting, demand respond, system planning, and several other important applications. We propose a data driven queuing model for residential EV charging demand by performing big data analytics on smart meter measurements. The data...
In this paper, a novel method is proposed for identifying the critical generator set following a system disturbance. The proposed method is specifically designed as an enhancement which works in conjunction with single machine equivalent (SIME) methods. The method utilizes an identical set of inputs, and the output yields an estimate of the set of critical generators, a requisite input for applying...
Among many works reported in the literature for mutual inductance (MI) calculation, Grover's filament method remains the most accepted standard for firsthandMI computation till today. Although Grover's method is fairly accurate, its implementation process becomes complicated due to the use of different formulae for various arrangements of filaments in a coil. The work presented in this paper describes...
Protection systems are indispensable for electric power generation, transmission, and distribution systems. In recent years, more and more research efforts have been devoted to consider protection system failures and their impact on composite power systems when performing reliability assessment. Protection systems were designed in the past using electromechanical and hardwired relay logic. With the...
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