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The paper has presented a new augmented buck converter to improve its transient performance. At first, an augmentation circuit based on diode-capacitor topology is introduced. The voltage across the inductor can be increased during load transients, and the rate of inductor current can be higher compared with conventional buck converters. Then, a hysteresis control algorithm based on output voltage...
In order to improve the harmonic reduction ability of the multi-pulse rectifier, this paper proposes a multi-pulse rectifier based on harmonic reduction technology at DC link. The proposed rectifier employs two diode bridges, each followed by a Boost converter. By controlling the inductor current of Boost converter, the input line current of the proposed rectifier can be approximated to sinusoidal...
This paper gives a detailed analysis and discussion of the flow field inside the type of D125 MOCVD reactor chamber through the analysis of three-dimensional mathematical model and calculation. Under a wide range of geometric and process parameters, such as varying total flow rate of gas inlet, chamber pressure, growth temperature, and wafer carrier rotation. It is finally obtained the favorable conditions...
Capacitor Commutated Converter (CCC) is a new kind of converter characterized by having capacitors inserted in between the converter transformer and the converter valves. Its behavior as harmonic source is the research point of this paper. Characteristic harmonics at the dc and ac side of CCC-HVDC system are studied, analyzed and compared with the Line Commutated Converter HVDC (LCC-HVDC) system....
This study discusses the operators' operating performance and mental workload while performing the reactor shutdown task in an advanced nuclear power plant (NPP) in the cases of different levels of automation, manual and semi-automation. At the same time, the key factors that affected the operators' mental workload and operating performance were identified as using the NASA task-load index (NASA-TLX)...
This study examines the effectiveness of information presentation and task operation in the main control room (MCR) from the human information processing (HIP) perspective. Their influences on operator workloads and implications to staffing are also discussed. The personnel from the Lungmen Nuclear Power Plant in Taiwan were selected as the target sample. A Total of 75 valid questionnaires were analyzed...
Ultra-high voltage direct current (UHVDC) converter stations produce high levels of carrier frequency noise which can cause harmful interference to power-line carrier and open-wire carrier systems. The noise models of converter valves and converters arranged with two 12-pulse valve groups in series per pole are given. Calculation results of noise interference on dc pole line and electrode line for...
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