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The two-level PWM inverter has expanded in industrial applications because it was able to achieve maintainability and high performance to surpass the DC drive by the development of the vector control and the IGBT (Insulated Gate Bipolar Transistor). However, as the main motor drive of the metal plant rolling mill, the two-level inverter output voltage was too low and capacity was too small, so the...
Dynamic performances of a wind turbine generating system consisting of series connected wind generators with parallel connected bypass diodes at rectified DC output terminals and a current source thyristor inverter are discussed. It is shown that the tip speed ratio of the individual turbine can be controlled almost constant with the proposed method, making an effective operation of the system possible.
The world's largest 450MVA STATCOM using GCT(Gate Commutated Turn-off) thyristor is designed for installation plan at Toshin substation of Chubu Electric Power Co. in Japan. The main purposes of the STATCOM are improvement of the power system stability and suppression of AC over-voltage occurred after route outage fault at heavy load condition. This paper describes the determination procedure of specification...
A voltage disturbance generator for the test of a microgrid is described. The generator provides the function of voltage sag, unbalance, outage, and phase jump of the output voltage. The proposed generator has good features of high reliability, low cost, simple structure, high efficiency, and easy implementation. The main components of the generator are SCR thyristors and transformers, which provides...
Thyristor converters are used as power conditioning systems for superconducting coils. The objective of this work is to discuss the series compensation of thyristor converters using variable series capacitors. Traditional thyristor converters can control the coil voltage by changing the firing angle and then also the lagging power factor on the ac side. Similarly, the series capacitor can control...
A 12-pulse phase-controlled rectifier has been used for high power applications. It consists of two sets of 6-pulse rectifiers. Basically they operate in parallel, but they operate alternately if load is light. The commutation of the DC current between the two rectifiers is examined and it is found that harmonic distortion of the input current is automatically minimized if they operate in the boundary...
This work attempts to explain reactive power consumption in a line commutated HVDC transmission system and suggests a possible solution to reduce it. A series injection strategy has been formulated using voltage-source converters and the effects have been simulated indicating a significant reduction in reactive power consumption by the converter terminal and consequently that supplied by the source...
A Smart Grid with distributed generation is critical for reducing greenhouse gas emissions. However, current power converters and circuit breakers built with silicon switches are very bulky and inefficient, making their use difficult in practical Smart Grid systems. The development of high voltage power devices based on SiC will be a critical development in building a Smart Grid with distributed and...
An extremely high-reliability 300 MW frequency converter has been developed. To achieve high reliability, the frequency converter adopts several dual (redundant) methods. The fault-system-lock function and the online recovery function greatly enhance the system reliability, allowing the Shin-Shinano FC to continue to operate almost without any stoppages due to faults. High-volume, non-volatile CPLDs...
This paper presents preliminary design considerations and functional testing of a pulsed electromechanical de-icing system for avionic applications. In particular, the focus is on the semiconductor device used to control the energy transfer between the power source and the transducer: 2d fully coupled electro-thermal mixed-mode device-circuit simulations are used to investigate various aspects of...
Cosmic-ray neutrons can trigger a single-event burnout (SEB), which is a catastrophic failure mode in power semiconductor devices. It was found experimentally that the incident neutron induced SEB failure rate increases as a function of the applied collector voltage in an insulated gate bipolar transistor (IGBT). Moreover, the failure rate increased sharply with an increase in the applied collector...
This paper presents a novel inverter suitable for high-voltage/high-power motor drive applications. The proposed inverter has the advantages of high motor power factor and self-startability, which are not realized by a load commutated inverter (LCI) drive. We have evaluated basic performances by using a downsized test system, and verified that the inverter operates at a motor power factor of 1. In...
The paper introduces a silicon controlled rectifier (SCR)-based device with high holding voltage for ESD power clamp. The holding voltage can be increased by extending a p+ cathode to the first n-well and adding second n-well wrapping around n+ cathode. The increase of the holding voltage above the supply voltage enables latch-up immune normal operation. The device is fabricated by 0.35um BCD (Bipolar-CMOS-DMOS)...
The performance of high-power inverters strongly depends on the characteristics of the underlying semiconductor device. The design of such devices is typically a compromise between on-state losses and switching losses. The idea analyzed in this paper is to combine two GCT devices into one single wafer, one switching-optimized GCT structure and one conducting-optimized GCT. By a parallel connection...
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