For digital distance relays, in order to get the correct measuring impedance, phase selector is widely used to identify the fault phases first. However, when a fault occurs at the line during powersystem swings, the ...
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In this paper, a simple parallel calculation cluster is built by PC and local area network. The power electric network is divided into several subnets according the method of path graph partitioning. Subnets are alloc...
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Combining electricity market dynamic model proposed by Alvarado, this paper uses differential/algebraic equations and eigenvalue techniques to study the stability of electricity markets. The necessary and sufficient c...
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ISBN:
(纸本)0863412467
Combining electricity market dynamic model proposed by Alvarado, this paper uses differential/algebraic equations and eigenvalue techniques to study the stability of electricity markets. The necessary and sufficient conditions of judging electricity market stability and asymptotical stability are provided. As well as the sufficient conditions of judging electricity market unstable and asymptotical unstability is presented. The obtained conclusions removed the condition of Yang's with the assumption "the matrix is square and nonsingular" and other conditions. Using these stability conditions may directly judge the electricity market model stability by the initial data. In addition, the theoretical results in this paper can be used to reasonably explain the unable phenomena of electricity market proposed by Alvarado.
Asymmetric load is quite common in distribution network, the compensation of which is a serious problem under some situations. A novel integrated compensation method is put forward based on the principle of reactive p...
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The flywheel energy storage (FES) system presented in this paper is composed of four parts;the flywheel, the bearing, the motor/generator and the power converter. The control methods and strategy of the FES system in ...
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Available transfer capability (ATC) determines the largest transfer that can be implemented in a certain direction across the power grid without violating security constraints. The uncertainties including load level, ...
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ISBN:
(纸本)0863412467
Available transfer capability (ATC) determines the largest transfer that can be implemented in a certain direction across the power grid without violating security constraints. The uncertainties including load level, aging and maintenance of elements and weather conditions, which have great influence on powersystem operation should be taking into account when calculating ATC. Considering time-varying nature and uncertainty of system parameters, the time-dependent model is adopted to describe the effects of weather conditions, aging and maintenance on element fault rates. Time-varying restoration time and load are modeled using random variables. The sequential simulation technique is applied to sample the system states, then based on linear programming and DC power flow ATC calculation is proposed. The algorithm based on MATLAB 6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.
DSR (dynamic security region) is one of the direct methods focusing on the transient stability of powersystem. This paper focuses on the DSRs of powersystem with different load models, and explores the characteristi...
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A new data-mining method for assessment of the ability of bidding units is proposed in this paper. The algorithm of reducing attribute value is introduced to get minimum rules. An example which considers the various f...
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The aim of relay protection is to isolate the fault zone or device and guarantee the system security. The primary protection and backup protection is in cooperation relationship, and backup one could not be canceled b...
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ISBN:
(纸本)9780889869059
The aim of relay protection is to isolate the fault zone or device and guarantee the system security. The primary protection and backup protection is in cooperation relationship, and backup one could not be canceled because of the DC power supply failure in substation. The fault location algorithm based on wide area information is one of the key points for novel wide area backup protection. By use of the synchronized phasor data uploaded by PMUs, the process of locating fault could be implemented in real-time or near real-time level. In this paper, based on Bayesian theory, we have studied the fault location in wide area backup protectionsystems. The simulation experiments have confirmed that the detection of fault can be resolved exactly and effectively by Bayesian theory.
A Super Capacitor Energy Storage (SCES) system applied to distributed generation system and distribution network is presented, which is mainly composed of three parts: the electrical double-layer capacitors array that...
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