ELECTRICAL GENERATION AND DISTRIBUTION SYSTEMS AND POWER QUALITY DISTURBANCES ppt

... modeling and simulation of power systems, power market and power line communications. H. Y. Zhu received her B.E., M.Eng., and Ph.D. degrees from the Huazhong Uni- versity of Science and Technology, ... transforms,” IEEE Transactions on Power Systems, vol. 18, no. 2, pp. 648– 656, 2003. [14] O. Poisson, P. Rioual, and M. Meunier, “Detection and mea- surement of power...

Ngày tải lên: 22/06/2014, 20:20

... patients and 300 controls) was enough to reach a power of 75% at a p = 0.05 (for a power of 80%, a total of 225 patients and 338 controls should be required at a p = 0.05, and 336 patients and 504 ... fibro- blasts, and stimulate the production and release of growth factors and cytokines that would induce cardio- myocyte hypertrophy [9,10]. The interactions between the angio...

Ngày tải lên: 18/06/2014, 16:20

... waveform data. 3. UNDERSTANDING POWER QUALITY DISTURBANCES: UNDERLYING CAUSES AND THEIR CHARACTERIZATION Characterizing the underlying causes of power quality distur- bances and extrac ting relevant ... methods for power quality disturbances: expert systems and support vector machines. There already exists a significant amount of literature on automatic classification of...

Ngày tải lên: 22/06/2014, 23:20

... maintenance and cost advantages found with power fuses. Protection and control devices, circuit breakers, and station batteries are required. The overcurrent relays are a small part of the total cost and ... load currents during peak and emergency conditions, performing coordination studies that include source and low side protection equipment, and expected transformer size a...

Ngày tải lên: 21/03/2014, 12:08

... 95TP102, 1995. IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems, ANSI=IEEE 242–1986. Ilar, M. and Wittwer, M., Numerical generator protection offers ... If above, the reverse power gets as low as 0.2 to 2% of the rated power and a sensitive reverse power relay is then needed. With steam turbines operating at full vacuum an...

Ngày tải lên: 21/03/2014, 12:08

... location. As the power systems become more complex and the fault current varies with changes in generation and system configuration, directional overcurrent relays become difficult to apply and to set ... those lines operating at 138 kV and above, sub- transmission lines are 34.5 kV to 138 kV, and distribution lines are below 34.5 kV. These are not rigid definitions and are o...

Ngày tải lên: 21/03/2014, 12:08

... in time, the process of power system cascading may start, leading to power system separation. When a power system separates, islands with an imbalance between generation and load are formed. One ... measurement and communication technology in wide area monitoring and control are expected to provide new, faster, and better ways to detect and control an emergency [6]. 4.2 Dis...

Ngày tải lên: 21/03/2014, 12:08

... state x, and recursively updates the estimate of state. The initial assumption about the state is that it is a random vector independent of the processes w k and v k and with a known mean and covariance ... time and Eq. (5.44) represents the measurements. The terms w k and v k are discrete time random processes representing state noise, i.e., random inputs in the evolution of the...

Ngày tải lên: 21/03/2014, 12:08

... Performance John R. Boyle Power Sys tem Analys is Protection of present-day power systems is accomplished by a complex system of extremely sensitive relays that function only during a fault in the power system. ... This restrike cannot be extinguished and will last until the oil becomes badly carbonized and a subsequent fault occurs between the bus breaker terminal and the break...

Ngày tải lên: 21/03/2014, 12:08