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Timely detection of the start time and location of disturbance is critical to power grid. The information helps operators quickly catch the disturbance events over wide areas and allows time for taking remedial reactions. In this paper, we proposed to detect the start time point of disturbance using Singular Spectrum Analysis (SSA), which has been proved to be an effective technique in the area of...
A new method is proposed in this paper for SVC streams transmission over IEEE 802.11e network. Our method combines the concept of SVC Quality Layers (QL), which provides good extraction of H.264/SVC streams in adaption, with an adaptive cross-layer significance-based early detection (SBED) algorithm to improve the video quality in wireless network. Experimental results show that the method achieves...
Small signal stability problems are one of the major threats to grid stability and reliability. Prony analysis has been successfully applied on ringdown data to monitor electromechanical modes of a power system using phasor measurement unit (PMU) data. To facilitate an on-line application of mode estimation, this paper develops a recursive algorithm for implementing Prony analysis and propose an oscillation...
Proposed the services composition algorithm based on QoS which combined local strategy and global strategy for constraints. The algorithm eliminates the services with low QoS firstly and then reduces the problem of services composition plan selection for global QoS guarantee to multi-dimension multi-choice 0-1 knapsack problem which is solved by the heuristic method for improving the efficiency of...
A time-limited pseudo-random signal is an important component in perturbation signals during a system identification procedure. In this paper, a finite-time duration pseudo-random waveform with desired continuous spectral features is generated using an extended time-frequency domain swapping algorithm. Multi-sine waveforms are used as initial waveforms. Through iterations, the waveform is polished...
Summary form only given. The frequency and clamping of electromechanical modes offer considerable insight into the dynamic stability properties of a power system. The performance properties of three mode-estimation block-processing algorithms from the perspective of near real-time automated stability assessment are demonstrated and examined. The algorithms are: the extended modified Yule Walker (YW);...
Role based trust management uses distributed role hierarchies (DRH) to provide flexible and scalable authorization in multi-domain environments, but DRH are inherently transitive and may easily lead to unexpected or even illegal authorization. In this paper, we propose TS-DRH, a generalized extension of DRH based on a novel trust scope model of distributed roles. TS-DRH introduces the notion of scoped...
<para> This paper proposes a robust recursive least square (RRLS) algorithm for online identification of power system modes based on measurement data. The measurement data can be either ambient or ringdown. Also, the mode estimation is provided in real-time. The validity of the proposed RRLS algorithm is demonstrated with both simulation data from a 17-machine model and field measurement data...
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