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This paper presents a multi-source data and information fusion framework for power transformer condition assessment. The proposed method adopts Bayesian Network (BN), which can integrate every piece of data and information obtained from different transformer diagnostic measurements. Within the Bayesian Network, Monte Carlo and Bootstrap methods are employed to extract the most informative characteristics...
The price of electricity in the Mid-Atlantic (PJM) region of the United States increased during the “Polar Vortex” at the beginning of 2014. Transmission lines were congested because of high demand during the extreme cold weather. The natural gas price for electricity generation increased more than 35% at the end of 2013. Energy Storage Systems (ESS) would have helped the system to overcome many difficulties...
With more wind power integrated into grid, wind-gas coordinating power generation attracts extensive attention, and it's no longer appropriate to validate automatic generation control (AGC) algorithm for large scale wind-gas generation with a single tool. First, this paper proposes an AGC simulation architecture that combines Real Time Digital Simulator (RTDS) and other off-the-shelf devices to implement...
This paper proposes a fuzzy logic controlled bridge type fault current limiter (FCL) to enhance the transient stability of multi-machine power systems. The transient stability performance of the fuzzy logic controlled bridge type FCL is compared with that of another static nonlinear controlled bridge type FCL. The total kinetic energy (TKE) of the generators in the system is used to determine the...
This paper proposes solutions to the problem of voltage sags caused by distributed generators anti-islanding protection. This is a recently identified power-quality (PQ) concern resulting from the increasing penetration of distributed generators into distribution networks. This problem has been previously investigated by the authors and it was revealed that it can seriously affect PQ indices as well...
The unified power flow controller (UPFC) is one of the most advanced devices in the flexible AC transmission system (FACTS) family. The modular multilevel converter (MMC) has recently become popular in high voltage direct current (HVDC) transmission and FACTS systems. The application of the MMC in a UPFC is an innovative idea, but its controller features a complex and hierarchical structure that requires...
Prior research has shown that spectral decomposition of the reduced power flow Jacobian (RPFJ) can yield participation factors that describe the extent to which particular buses contribute to particular spectral components of a power system. Research has also shown that both variance and autocorrelation of time series voltage data tend to increase as a power system with stochastically fluctuating...
Substantial changes in the generation portfolio take place due to the fast growth of renewable energy generation, of which the major types such as wind and solar power have significant forecast uncertainty. Reducing the impacts of uncertainty requires the cooperation of system participants, which are supported by proper market rules and incentives. In this paper, we propose a bilateral reserve market...
Determination of the optimum number and placement of sectionalizing switches in Distribution Automation (DA) feeders is a very challenging task. This is an important step in the feasibility process of DA projects and one has to consider the trade-off between reliability and economics to arrive at the answer. This paper presents a novel iterative approach based on the relative reduction in the normalized...
This paper proposes a new fault location technique for EHV double circuit transmission lines using synchronized current and voltage measurements from both ends. Double circuit lines faces difficulties in fault location due to mutual coupling. Modal transformation is used to decouple the coupled transmission line equations. Fault detection and location indices in terms of modal components of measured...
In this paper, a simulation tool based on the probabilistic three phase Load Flow (PLF) program has been developed by using Monte Carlo techniques. By using this tool, technical and economic impacts of EV integration on the distribution network are assessed. Studies of the potential opportunities of ancillary services provided by EV are also carried out by using this tool. In order to reduce congestion...
This paper presents a method of evaluating node voltages within distribution network using probabilistic load flow (PLF) analysis. It builds on the traditional deterministic load flow (DLF) approach which gives a picture of said network at one specific point in time. The probabilistic approach improves this by taking into account network uncertainties such as fluctuations in household consumption...
In this paper, an extended-L (EL) index is considered as a voltage stability constraint in optimal power flow (OPF) which guarantees adequate voltage stability margin (VSM) for an electricity market solution. The EL-index uses a generator equivalent model (GEM) that has significant effect on voltage stability studies. Two important objective functions which are maximization of the social welfare and...
Real Time Hardware-in-the-Loop (RT-HIL) performance assessment of three different passive islanding detection methods for both local and wide-area synchrophasor measurements is carried out in this article. Islanding detection algorithms are deployed within the Phasor Measurement Unit (PMU) using logic equations. Tripping decisions are based on local and wide-area synchrophasors as computed by the...
During the last decade there has been an increasing interest in the High Voltage DC grids amongst researchers and policy makers. Protection has been identified as a critical component in the realization of these multi-terminal direct current (MTDC) systems. The fault currents in the DC systems are limited by the circuit resistance and inductance and thus are likely to reach very high values. This...
Traditionally, the optimal power flow (OPF) assumes a constant (active and reactive) power load model and thus it neglects the effect of the voltage sensitiveness of power load injections. As a consequence, the results from the OPF may be distorted and lead to suboptimal solutions. This paper proposes an optimal power flow, which seeks to minimize the total active power losses of a distribution network...
Control room operators play an important role in mitigating the effects of disturbances on the power grid. We focus on solar storms and geomagnetic disturbances in this paper. Providing operators with advanced tools that reveal relationships between variables that characterize events in real-time enables faster response. For complex events such as GIC (geomagnetically induced currents), the output...
This paper studies the impact of utility-scale microgrids on day-ahead (DA) markets, proposes a procedure to manage microgrids in daily operations of a DA market, and provides a guidance in planning new microgrids. As new utility-scale microgrids are being planned and built, the cumulative capacity of microgrids in the U.S. is expected to double in five years. In a region with a significant power...
Reduced external networks supplied with real-time data are employed in this paper to solve the state estimation problem in interconnected systems. We propose a method to obtain a composed single system state of different monitored areas with local estimations and external equivalent models, which neither require the use of a coordination agent nor requires extensive data interchange. Phasor measurement...
This paper implements an efficient sensitivity analysis (SA) technique to identify and rank critically important uncertain parameters that affect the small-disturbance stability of a power system. Identification and ranking of uncertain parameters are vital in modern power system operation due to the adoption of deregulated market structure and integration of intermittent energy resources and new...
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