80C196单片机控制闭环逆变系统的研究

介绍了基于８０Ｃ１９６单片机控制的变频调速系统的构成及工作原理,详细地述了ＰＷＭ模块用于ＧＴＯ逆变系统的方法及ＧＴＯ门极触 发方案,。实验结果证明该系统优良,工作可靠。     

80C196单片机控制闭环逆变系统的研究

介绍了基于８０Ｃ１９６单片机控制的变频调速系统的构成及工作原理。详细地论述了ＰＷＭ模块用于ＧＴＯ逆变系统的方法及ＧＴＯ门极触发方案。实验结果证明该系统性能优良、工作可靠。     

80C196单片机控制闭环逆变系统的研究

介绍了基于８０Ｃ１９６单片机控制的变频调整系统的构成及工作原理,详细地论述了ＰＷＭ模块用于ＧＴＯ逆变系统的方法及ＧＴＯ门极触发方案。实验结果证明该系统性能优良、工作可靠。     

利用实测GTO阳极电流波形设计逆变器缓冲电路

缓冲电路参数值对ＧＴＯ的关断性能及整个ＧＴＯ逆变器的工作性能起着至关重要的作用。本通过对ＧＴＯ关断过程中阳极电流与阳极电压波形的分析,提出一种以“综合指标”作为目标函数的缓冲电路参数寻优方案,可根据对ＧＴＯ装置性能的具体要求确定ＧＴＯ缓冲电路元件的最佳参数。     

GTO拖尾电流及其对关断性能的影响

本文系统的阐述了ＧＴＯ拖尾电流的产生机理、组成、性质及特点，给出了ＧＴＯ在拖尾阶段的等效电路。在实验印证的基础上，作者首次逐段分析了关断过程中位移电流变化对拖尾电流的影响，论述了拖尾电流、拖尾损耗对ＧＴＯ关断性能的影响，并对由于拖尾损耗过大引起ＧＴＯ再导通现象的机理给予了说明     

大功率GTO直流斩波器的研究

对１ＭＷ大功率ＧＴＯ直流斩波器的缓冲器、门极驱动器及保护系统进行了探索、并采用ＥＭＴＰ程序对在受控核聚变负载条件下的大功率ＧＴＯ直流斩波器的瞬态过程进行了动态仿真。     

IGCT和IEGT——适用于STATCOM的新型大功率开关器件

硬驱动概念的出现极大地改进了门极可关断晶闸管（ＧＴＯ）的关断性能,并导致了集成门极换向型晶闸管（ＩＧＣＴ）的出现。ＩＧＣＴ在ＧＴＯ技术的基础上,采用新技术集成了硬驱动门极驱动电路及反并联二析管。使器件不需关断吸收电路、可靠性更高、工作频率更高、易于串联工作．电子注入增强门极晶体管（ＩＥＧＴ）是东芝公司于１９９３年开发出的一代电力电子器件。它具有通态压降低、门极驱动简单、开关损耗小、串联运行容易等诸多优点。ＩＧＣＴ和ＩＥＧＴ的将逐步取代ＧＴＯ广泛应用于中等电压大容量变流器中,文中简要地介绍了ＩＧＣＴ和ＩＥＧＴ的基本结构、工作原理、性能比较,以及在静止补偿器和逆变器中的应用情况。     

GIS 中快速暂态过电压的测量

在不改变ＧＩＳ结构的条件下建立了实用的快速暂态过电压（ＶＦＴＯ）测量系统,在５００ｋＶＧＩＳ中进行了ＶＦＴＯ实测。     

可关断晶闸管无破坏测试模糊专家系统的研究

应用专家系统理论和模糊理论建立了可关断晶闸管（ＧＴＯ）无破坏测试模糊专家系统（ＧＴＯ ＮＤＴＦＥＳ）。ＧＴＯ ＮＤＴＦＥＳ主要具有两种功能：测试ＧＴＯ的最大可关断阳极电流ＩＡＴＯ和判断ＧＴＯ的性能优劣。为了表达“ＧＴＯ临近其关断极限”这一模糊概念,文章首次提出了“安全隶属度”的概念,并提出了用特征量的当量值变化的拟合曲线以确定安全隶属度垢模糊推理方法。提出了用极小－极大法则进行了模糊推理以评价ＧＴ     

2000A/2500V 大功率 GTO 牵引斩波组件的研制

介绍了集ＧＴＯ元件、驱动器、吸收器及散热器为一体的２０００Ａ／２５００Ｖ大功率ＧＴＯ组件;给出了该组件的结构设计、实验结果及实际运行效果。     

New Approach to a High-Power GTO PWM Inverter for AC Motor Drives

A control method for GTO PWM inverter parallel-set operation and a new protection system for prevention of short-circuit faults caused by turn-off failure, both to realize a high-power drive system are described. Timing control of GTO gate pulse command provided by a feedback loop, and a reactor at the output of the inverter can minimize the cross current flowing between inverters and can balance the output current of each inverter in inverter parallel-set operation. This method eliminates the necessity of selecting GTO's of equal characteristics, and can apply to parallel-set operation of three or more inverters. The new protection system judges the on and off states of the GTO from the GTO gate-cathode voltage and detects turn-off failure of the GTO. This method positively stops the inverter system safely and reliably upon turn-off failure of the GTO. Experiments are carried out on a 30-kVA inverter and two sets of 450-kVA GTO inverters.     

A multiple PW GTO line-side converter for unity power factor andreduced harmonics

A multiple PWM GTO line-side converter with low switching frequency has been developed for industrial uses needing both higher capacity and higher performance. The multiple converter is composed of two GTO converter units connected in parallel through an interphase reactor. The switching frequency of the GTO thyristors in the multiple converter can be reduced to a quarter of that in the single converter. It is verified by simulations and experiments with a 2750 kVA GTO converter and inverter system with a 500 Hz switching frequency that the system has: (1) a unity power factor, (2) reduced harmonics, (3) bidirectional power flow, and (4) speed regulatory performance equal to that of an advanced cycloconverter drive system. Analogies between inverter control and converter control are also studied for the development of the converter control     

An evaluation of resonant snubbers applied to GTO converters

Aspects of the application of resonant snubber technology to gate-turn-off (GTO) converters are investigated. GTO power switches require snubbing at turn-off when applied in converters. This leads to the extensive use of regenerative snubber circuits in GTO converters due to the difficulties involved in using dissipative snubbers. At present, it is accepted that the repetition switching frequency of GTO pulse-width modulated (PWM) circuits is largely determined by the resettling time of regenerative snubbers. The resonant DC link may be seen as a nondissipative snubber and holds the promise of a faster resettling time. The behavior of GTO devices is investigated under the conditions applied to them by this kind of snubbing and its application in GTO converters. The concept has been demonstrated with 90 A 1200 V GTOs     

Improved current source GTO inverter-fed induction motor driveswith PWM-controlled thyristor converter

An improved current-source GTO (gate turn-off) inverter system for driving an induction motor at high frequency was developed. This system is composed of an inverter using GTOs and a PWM (pulsewidth-modulated)-controlled thyristor rectifier. The energy rebound circuit in the inverter is used to turn off the thyristors in the rectifier and to apply PWM control techniques. This circuit plays an important role in the treatment of reactive power in a load. The capacitors connected to the AC input terminal to improve PWM control also function as a filter. Thus, the waveforms of the input voltage and current become almost sinusoidal. Principles and circuit operations of the rectifier section are described in detail. The current-source GTO inverter is used to drive a 5.5 kW induction motor. The experimental waveform and characteristics for the tested motor drives are given. It is shown that the harmonic components of the input voltage and current are eliminated or reduced by using the PWM control technique without spoiling the inherent characteristics of the current-source GTO inverter     

A new regenerative snubber circuit for large-capacity three-level GTO inverter systems

Increase in the capacity of GTOs has made remarkable progress in recent years. At present, 4.5-kV, 4.0-kA GTOs are commercially available, and 6.0-kV, 6.0-kA GTOs made from 6-inch silicon wafers are appearing. The 6-inch GTOs will be applied to our three-level GTO inverter system. In order to apply GTOs to voltage-source inverters, snubber circuits are necessary for limiting on the turn-on di/dt and turn-off dv/dt. To realize high efficiency of the system, regenerative snubber circuits are often applied. A conventional circuit applied to three-level GTO inverters had the problem of long paths created for snubber circuits of the inner GTOs. Another circuit using a current transformer for recovering the energy trapped in the snubber circuits of the inner GTOs has been presented. In this paper, a new regenerative snubber circuit is proposed, which is more suitable for three-level GTO inverter systems with many phase-legs. By applying the snubber circuit, all snubber energy generated by each GTO switching can be regenerated to the dc link. In addition, high current turn-off performance of both the inner and the outer GTOs is verified by several successful experimental results using 6-inch 6.0-kV, 6.0-kA GTOs. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 120(2): 41–48, 1997     

新型GTO串级调速工业装置

本文介绍的一种新型交流调述装置,该装置的主要特点是只对一支 GTO 元件进行对称 PWM 控制。它与普通的串级调速系统相比较,具有较高的功率因数。     

Analysis of PWM current source GTO inverter with PWM-controlledthyristor rectifier for induction motor drive

With the application of an energy rebound circuit for the pulsewidth modulation (PWM)-controlled rectifier, an improved current source gate turn-off thyristor (GTO) inverter system capable of producing sinusoidal inputs and outputs is presented. The energy rebound circuit in the inverter is used to turn off the thyristors in the rectifier for applying PWM control techniques and also to clamp the spike voltage produced in the inverter circuit. The principles and circuit operations of this system are described in detail, and requirements for PWM control of the rectifier are investigated. The conditions for satisfying the requirements of the energy rebound circuit are analyzed by experimental and theoretical methods. The PWM-controlled current source GTO inverter system is used to drive an eight-pole 400 Hz 5.5 kW induction motor. Analytical and experimental results, as well as the characteristics of the motor drives, are given