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This paper proposes a new transmission-constrained unit commitment method that combines the cost-efficient but computationally demanding stochastic optimization and the expensive but tractable interval optimization techniques to manage uncertainty on the expected net load. The proposed hybrid unit commitment approach applies the stochastic formulation to the initial operating hours of the optimization...
This panel discussion addresses two topics. The first one concerns the functionality of power system restoration tool entitled “System Restoration Navigator (SRN)” supported by EPRI. The SRN is based on the theory of Generic Restoration Milestones (GRMs). The functions of this prototype include: GUIs, strategy generation engine and security checking interface. By interactive GUIs, constraints and...
This paper presents a novel approach for the transmission network expansion planning under generalized joint generation and transmission n-K security criteria. The proposed methodology identifies the optimal expansion plan while modeling the power system operation under both normal and contingency states. An adjustable robust optimization approach is presented to circumvent the tractability issues...
This paper proposes a chronological probability model of photovoltaic (PV) generation on the basis of conditional probability and nonparametric kernel density estimation. In addition to randomness of PV power, the correlation of PV powers between adjacent time points and the uncertainty of start and end moments of PV output can be represented. The proposed model can be employed to produce random PV...
This paper presents a novel approach to enable frequent computational cycles in online dynamic security assessment by using the terms of the transient energy function (TEF) as input features to a machine learning algorithm. The aim is to train a single classifier that is capable of classifying stable and unstable operating points independent of the contingency. The network is trained based on the...
This paper proposes an algorithm for the capacity constrained management of Distributed Energy Resources in unbalanced distribution network. The algorithm is based on linear constraints being generated from a linear approximation of the functional relationship between control variables and constrained operational variables. To eliminate the incurred linearization error, the proposed algorithm is performed...
The operation and control of power grids will increasingly rely on data. A high-speed, reliable, flexible and secure data architecture is the prerequisite of the next-generation power grid. This paper summarizes the challenges in collecting and utilizing power grid data, and then provides reference data architecture for future power grids. Based on the data architecture deployment, related research...
Power system is facing great challenges resulted from various smart grid initiatives, high penetration of renewable resources, and increasing complexity of networks. To address these challenges, cloud computing offers an attractive IT alternative that can facilitate power system operations in various aspects. This paper discusses the potential implementation of cloud computing technique for power...
An on-line line switching method based on a three-stage strategy to effectively relieve overloads in power systems is proposed. The proposed method is designed for on-line applications in the control center environment. To balance the requirements of solution speed and of effectiveness, the proposed three-stage method is composed of screening stage, ranking stage and detailed analysis stage. One distinguishing...
This paper presents a distributed multi-agent scheme for enhancing the cyber security of smart grids which integrates computational resources, physical processes, and communication capabilities. Smart grid infrastructures are vulnerable to various cyber attacks and noises whose influences are significant for reliable and secure operations. A distributed agent-based framework is developed to investigate...
A Support Vector Machine (SVM) based approach for microgrid islanding decision and control is investigated. The IEEE 13-feeder system is modified and serves as the microgrid model connected to Kundur four-machine two-area system that models the main transmission grid. A representative data set is obtained through simulations in MATLAB/Simulink considering multiple typical scenarios with or without...
Increasing uncertainties in power system operation require novel approaches for utilizing operational flexibility to enable a both secure and efficient power supply. This paper presents a real-time coordination approach for adaptive redispatch of generation and load in case of overloads in the electrical transmission network. For this, a previously developed multi-agent system for coordinating power...
Dependency on thermal generation and continued wind power growth in Europe due to renewable energy and greenhouse gas emissions targets has resulted in an interesting set of challenges for power systems. The variability of wind power impacts dispatch and balancing by grid operators, power plant operations by generating companies and market wholesale costs. This paper quantifies the effects of high...
This paper proposes a new concept of loadability for interconnected distribution systems, in which feeders are connected with normally-open tie-switches and the N-1 security principle is applied. Firstly, this paper presents a nonlinear model to formulate the N-1 loadability, in which network topology, thermal rating of lines and substation transformers, voltage limits and losses are considered. Secondly,...
The paper presents a novel algorithm to enhance the operational planning flexibility of protective measures of electromagnetic transients in smart power systems. The algorithm considers a risk constrained approach to place surge arresters and to enhance the power supply security. It facilitates a reduction in the number of surge arresters required for electromagnetic transient protection without taking...
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...
Power flow solvable boundary plays an important role in contingency analysis, security assessment, and planning processes. However, to construct the real solvable boundary in multidimensional parameter space is burdensome and time consuming. In this paper, we develop a new technique to approximate the solvable boundary of distribution systems based on Banach fixed point theorem. Not only the new technique...
In this paper, a new Distribution Management System (DMS) based on security region is proposed. First, the model and topological characteristics of Distribution System Security Region (DSSR) are both introduced. This new theoretic tool provides a chance to implement real-time security analysis and control for distribution systems. Second, this paper proposes and describes five security states for...
The need to increase situational awareness in power systems is more evident than before. Increased power system complexity and integration of intermittent resources have contributed to the emerging need to monitor power systems in real time. Real time contingency analysis can increase situational awareness by monitoring the power system in real time and alarming the operators of the impending problems...
Net Transfer Capacity (NTC) values are an indication of cross-border transmission capacities that may be used by market participants to conduct electricity transactions across the borders of two or more areas (countries) in Europe. Cross-border transmission capacities, defined by neighboring TSOs, are generally restricted due to capacity limitations of tie-lines and concerns related to the secure...
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