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A novel identification method for critical oscillation mode is presented, which makes use of inter-area oscillation and relevant generator contribution factor. Firstly, the relevance between oscillation mode and electric parameters is analyzed. A state equation method is introduced to describe strongly relevant generator sets in multi-machine power system. Secondly, the oscillation assessing index...
Severe disturbance screening is of great significance for evaluation methods in Dynamic Security Assessment (DSA) to rank the severity of all the potential contingencies of the system operators' concern. While traditional methods only focus on one kind of power system stability, either angle stability or voltage stability, which are not yet adequate for nowadays comprehensive dynamic security assessment...
The aim of this paper is to examine changes in information asymmetry around the merger announcements. Empirical studies generally find evidence of a significant reaction of stock price or bid-ask spread before the initial announcement date, but they do not consider separately the different components of the spreads, nor do they take into account the implications of the market microstructure on the...
Traditional trading methods are based on the integrated optimization problems of economy and environmental protection, but do not consider the effects on demand-side. A revised model for medium and shortterm trade planning is presented in this paper. It firstly forecasts the industry electric quantity of peak, flat, valley monthly on the demand side using the parameter-modified grey model and consider...
This paper presented an improved forward-backward sweep method and applied the hybrid particle swarm algorithm to solving the distribution network reconfiguration (DNR) with the distribution of power generation units through network simplification. This method can improve the convergence ability and global optimization ability of the traditional PSO. Solution procedure applied the decimal code to...
This paper takes the absolute deviation as a risk measurement index for the power-supplying company, which dose not need to consider whether the variance of asset returns is existent or not., and introduces an absolute deviation optimal purchasing portfolio model for multiple markets, quantizing the risk and expected revenue rate of the power-supplying company. Taking the power purchasing in four...
In recent years, the research on power system black-start for the large-scaled break-off power fault is becoming an absorbing topic regarding the power system safety. The starting of induction motor machines that have large output power is a big threat to ensure the reliable running of a small system at the initial period of black-start. In this article, RTDS tool was utilized to simulate the black-start...
Regulated power systems not only were built with excess capacity, but also operated with conservative security limits. But under deregulated environment, the requirement of maintaining security and maximizing the return on existing investments becomes one typical antinomy, resulting in operating the system closer to the traditional deterministic limits or even beyond them by assuming that the contingencies...
This paper presents an idea that partial discharge event always in initial phase of power capacitor's on-line failure. Based on this idea, a device introduced for on-line detects partial discharge to prevent latter failure. Simulation using wavelet-transform in MATLAB 6.5 for pick up partial discharge signals from collective data was conducted. Another simulation also using wavelet-transform for de-noises...
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