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Mechanically switched capacitors (MSC) are very well known reactive power compensation devices which are extensively in use in power transmission systems. However, during switching of MSC in a high voltage grid, significant transients are found to appear across the capacitor bank bus as well as different elements of MSC which may lead to insulation degradation affecting the long term performance of...
Mechanically switched capacitor with damping network (MSCDN) is a low cost economical device used in power systems to serve the dual purpose of supplying reactive power at the fundamental frequency as well as to eliminate the unwanted harmonics when tuned at the desired harmonic frequency. However, during switching in a high voltage A.C grid, various elements of an MSCDN plant are subjected to transient...
To achieve higher output PWM frequency with limited switching frequency of devices, a topology named parallel frequency-multiplication is employed in this paper, which, however, leads to more serious current spike and oscillation in the turn-on transient because of the parallel of devices. Aiming at this issue, the theoretical analysis of transient process is presented to explain how the current spike...
This paper investigates the effects of ringing on the switching losses of wide band-gap (WBG) devices in a phase-leg configuration. An analytical switching loss model considering the parasitic inductance, stray resistance, devices' junction capacitances, and reverse recovery characteristics of the freewheeling diode is derived to identify the switching energy dissipation induced by damping ringing...
Distribution transformers operating in modern system grids or in industrial networks are subjected to many switching transients. They may occur due to routine operations, network reconfigurations or reaction on protection signals. Depending on the network configuration and parameters such events my lead to external overvoltages and result in additional stresses on the insulation system. The paper...
The static synchronous series compensator (SSSC) is a new series compensator equipment of the FACTS family. Compared to the Thyristor Controlled Series Compensation (TCSC) which is in common use, the SSSC has wider control range and faster response speed. The study and comparison on their transient control behavior has much to do with the stability of the power system and the setting of relay protection...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
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