Design and operational testing on thyristor modules for the SVCKemps Creek

The design and operational testing of valves for the SVC (static Var compensator) to be installed at Kemps Creek substation in Australia are discussed. The most important design principles and features of the thyristor modules are given. Operational tests carried out on the thyristor modules are described; for this test program, noteworthy test circuits have been set up to perform both TSR (thyristor switched reactor) and TSC (thyristor switched capacitor) fault current tests with high test values and special waveforms. Test results and test circuits are presented     

谈晶闸管投切电容器TSC的触发电路

介绍了晶闸管投切电容器的原理和快速过零触发要求,分析了两类晶闸管的触发电路的特点和存在的问题,指出了一种新型的从主回路晶闸管获取晶闸管电压过零信号的电路框图,以该电路为支撑又产生了一系列触发电路,取得了很好的触发效果。     

谈晶闸管投切电容器TSC的触发电路

介绍了晶闸管投切电容器的原理和快速过零触发要求,分析了两类晶闸管的触发电路的特点和存在的问题,指出了一种新型的从主回路晶闸管获取晶闸管电压过零信号的电路框图,以该电路为支撑又产生了一系列触发电路,取得了很好的触发效果。     

Transformerless synthesis of transistor and thyristor switching RLC 1-ports

As an extension of the synthesis method developed in a previous paper, the transformerless synthesis of reciprocal switched 1-ports is presented in this paper. the transformerless structures of resistance switching n-ports described by impedance, admittance or hybrid matrices have been proposed. These structures enable the synthesis of dynamical switching RC, RL and RLC 1-ports. Using the state variables method, the realizability conditions and identification formulae for constant and sinusoidal input functions have been derived. Three numerical examples illustrate the developed methods. the present theory can be applied to create new thyristor and transistor arrangements, particularly compensators and auxiliary switching LC circuits facilitating the commutation of thyristors and transistors.     

A FAST THYRISTOR-CONTROLLED AC VOLTAGE REGULATOR

ABSTRACT

In this paper, a fast a.c. voltage regulator using thyristor controlled coupled circuits is presented. The load voltage can be stabilized against supply voltage variation above and below the desired level. Boosting or bucking effect is performed in steps but with no distortion or phase-shift in the load voltage. Fine adjustment of load voltage is possible using phase-control in a narrow range (in between the steps). A three limb magnetic circuit is used such that flux of the boosting (or bucking) coil is varied in accordance with the action of a switched secondary circuit. Accordingly voltage current transients in the load circuit are avoided.

Commutation from the outgoing to the incoming thyristor is natural. Selection of the thyristor gating is effected by an electronic circuit which acts within a halfcycle if the supply votlage is varied. Theoretical and experimental investigations are reported and performance of the test model is computed and compared with the test results.     

Synthesis of transistor and thyristor switching 2-ports

Contents Realizability conditions of periodic waveforms presented in previous works are extended for multiport circuits. Formulae for an identification of state matrices and a complete synthesis method are given for RL, RC, and RLC 2-ports switching two times within a period. The synthesis presented in the paper is based on multiport transformer structures with switched windings. The reactance extraction method and state variable approach are used. Six general switching structures of 2-ports have been obtained as a result of the synthesis. The structures and the synthesis method can be applied to create new transistor and thyristor arrangements, e.g. D.C.-A.C. converters, frequency changers and compensators.

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Synthese der Transistor- und Thyristorschaltzweiklemmenpaare

Übersicht In dem Aufsatz wurden neue Realisierungsbedingungen der passiven Schaltkreise mit periodischen Zeitverläufen dargestellt. Die Identifizierungsformeln der Zustandsmatrixen für RL-, RC- und RLC-Zweiklemmenpaare wurden dargelegt. Die volle Synthesemethode der Schaltkreise, die zweimal in einer Periode umgeschaltet werden, wurde bestimmt, wobei die Extraktionsreaktanzelementenmethode verwendet wurde. Aufgrund der Synthesemethode wurden sechs allgemeine N-Klemmenpaartransformatorstrukturen bestimmt. Diese Strukturen ermöglichen die Beschreibung neuer Transistor- und Thyristorschaltungen.

     

晶闸管换流电路分析及换流的分类研究

本文全面地研究了晶闸管的各种换流方式,对晶闸管的换流方式进行了较为全面的合理的系统性分类。这种分类方法有助于晶闸管电路(整流器、斩波器、逆变器等)的分析与设计。     

高性能晶闸管电力回收装置

本文介绍了一种高性能晶闸管电力回收装置，它以晶闸管两重桥逆变主电路将功率试验中的电能回馈电网，具有十分明显的能源回收利用效果，其控制单元全由集成电路组成，文中不但详细介绍了该电力回收装置各部分的工作原理，而且给出了其在２６０ｋＶＡ晶闸管二重桥电力回收系统中的实用效果。     

晶闸管阀高位取能电路研究

由于晶闸管耐压等级高,在高压动态无功补偿装置中广泛使用,由晶闸管串联构成的晶闸管阀,是晶闸管控制电抗器(TCR)的核心器件,在高电压下晶闸管阀驱动电路以何种方式获取能量是高压动态无功补偿装置必须考虑的问题.为了增加晶闸管串联运行的可靠性,设计了一种电压电流取能电路,能够满足TCR在各触发角下均能取到能量,给驱动电路供电,实现晶闸管阀高位系统自供电.利用PSPICE软件建立各取能电路仿真模型,仿真结果表明:高位取能电路能够减少开关损耗,提高晶闸管运行效率,而且能向驱动电路提供电能,为晶闸管阀的驱动电路稳定供电提供了理论基础.     

宁东—山东±660kV直流输电工程晶闸管阀运行试验

为追求更高的传输效率及传输容量,特高压直流输电工程在我国电网中的应用越来越广泛。晶闸管阀作为其中的关键设备之一,必须通过完备有效的型式试验,以确保阀的设计是正确的。在IEC 60700-1标准的基础上,通过对现有运行试验电路的深入调研,开发了一套新的运行试验装置,并将其应用到宁东—山东±660 kV直流输电工程,试验结果表明该工程晶闸管阀的研发是成功的。     

Advanced series compensation for transmission systems using aswitched capacitor module

A design strategy is presented for a switched capacitor module for use in series-compensation schemes. The module offers improvements over existing schemes by utilizing thyristor-switched capacitors to allow fast, reliable and flexible series compensation. It is shown that offset voltages due to reinsertion can be eliminated in several ways, and proper damping prevents thyristor damage. The minimum energy rating required for the metal oxide varistor (MOV) is specified based on the switching capabilities of the thyristor pair     

A Novel Current Impulse Commutation Circuit for Thyristor Inverters

A novel current impulse commutation circuit for single- and three-phase thyristor inverters is presented and fully analyzed. Relevant design expressions are also derived. Moreover, it is shown that the proposed circuit has a number of significant advantages over commutation circuits currently employed.     

Concept of a combined short circuit limiter and series compensator[power lines]

A novel concept for a combined short circuit limiter and dynamic series compensator is presented. The device consists of a fixed capacitor, thyristor switched capacitors, and a thyristor switch inductance. The circuit is designed to regulate the impedance in steps. The series compensation is controlled by the capacitors switching on and off, while the current limitation is achieved by the insertion of a resonant LC circuit in the transmission line. The thyristor switches are operated at zero current crossing, which eliminates the harmonics generation. The system operation has been analyzed and realistic components have been selected. The results have demonstrated that the device can regulate the short circuit current. It can be built with commercially available components; the significant operation improvement is expected to justify the cost of the new device     

HVDC晶闸管换流阀中晶闸管反向恢复期保护电路几个问题的探讨

三峡———常州高压直流输电的晶闸管换流阀中 ,每个晶闸管都有一块控制电子线路单元 (TCU) ,其功能为控制并检测该晶闸管。另外 ,还具备正向保护 (PF)和反向恢复期保护 (RP)性触发功能。笔者就反向恢复期保护电路中的几个问题进行探讨。     

On a class of pseudo‐logarithmic amplifiers suitable for use with digitally switched resistors

This paper describes three circuits that implement pseudo‐logarithmic functions, which are simple and easy to implement. The circuits can be realized using operational amplifiers or current feedback amplifiers. Tuning can be achieved using switched resistors, or active resistors, or tunable transconductors, but are best suited for use with digitally switched resistors. Frequency response and stability considerations for two of the circuits are thoroughly discussed and PSPICE results confirming the theoretical results are presented alongside measured results. Copyright © 2007 John Wiley & Sons, Ltd.     

Uninterruptible Power Supply for Critical AC Loads?A New Approach

An uninterruptible ac supply system consisting of two power sources (static inverter and ac line) and a thyristor switch is presented. The thyristor switch is operated in such a way that the equalization current flow between the sources is prevented. Consequently continuous parallel operation of the sources may be applied. Faults in one of the sources do not affect the voltage supplied to the load. In order to obtain these features the trigger mode of the switch must meet certain requirements. The analysis of these requirements is given and an implementation of the system is presented. Test results are illustrated by oscillograms. The advantages of the system are that 1) load transfer is performed in an instantaneous and smooth way, 2) the system is able to deliver large inrush currents required by the load and to blow fuses in branch circuits of the load, and 3) no voltage monitors are required.     

串联晶闸管反向恢复暂态过程的研究

随着柔性交流输电和高压直流输电设备在电力系统中的应用越来越广泛,由晶闸管主要组成的高电压大电流电子开关越来越成为人们关注的对象。虽然有不少文献对晶闸管模型研究及其外围电路设计进行了介绍,但有关串联晶闸管反向恢复暂态过程的研究还未见报道。文章在晶闸管反向恢复电流指数函数数学模型的基础之上,对串联的2个晶闸管的反向恢复暂态过程进行了暂态分析、数学推导以及仿真等研究。计算和仿真结果表明,暂态分析是正确的,在一定的精度范围内数学计算公式的假设也是合理的。     

一种TSC型SVC中晶闸管高频送能系统的研究

介绍一种静止无功补偿装置(SVC)中晶闸管投切电容器(TSC)的原理和快速过零触发要求,证明了TSC 的晶闸管触发电路采用高频送能的原因,分析了高频送能系统的构成及工作原理.验证了高频送能系统用于晶闸管触发的可靠性,取得了良好的效果,并为TSC的工程应用莫定了坚实基础.     

TSC无功补偿装置的触发器

从负载要求、补偿装置结构、电压等级、晶闸管结构、同步触发信号的选取方式等不同的角度,阐述了晶闸管投切电容器(TSC)的触发器的技术性能、参数要求、标准,以推动TSC触发器技术的进步。     

虚拟仪器技术在晶闸管电路测试中的应用

提出了基于虚拟仪器技术的晶闸管电路测试方法 ,为解决晶闸管装置应用中的功率因数低和产生高次谐波两个主要问题提供了依据。介绍了在LabVIEW平台上开发的晶闸管电路测试系统这一虚拟仪器技术在晶闸管产品开发领域中应用的具体实例