Suppression of DC Line Current Oscillation of HV DC Transmission System Using Voltage Source Forced Commutation Converter
Suppression of DC Line Current Oscillation of HV DC Transmission System Using Voltage Source Forced Commutation Converter
复制标题
电压源强制换相变流器抑制高压直流输电系统直流线路电流振荡
DOI：
10.1541/ieejias.113.57
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
K. Matsuura
中科院分区：
文献类型：
--
作者：
T. Funaki;N. Kimura;K. Matsuura
高压直流系统中使用的传统转换器需要线路电压来关闭流过晶闸管或汞弧阀的电流。因此，高压直流系统无法向没有交流电源的系统（例如发电机或同步调相机）供电，或者高压直流系统在弱系统下运行存在一些困难。避免这些问题的传统解决方案是安装大容量同步调相机，这需要相当大的建设和维护成本。另一种解决方案是强制换向变换器的应用。最近开发的具有快速栅极关断能力的高功率和高频半导体器件（例如GTO和SI晶闸管）建议将电压源型强制换相转换器（VSFC）应用于高压直流系统。为了确保整个系统的良好特性，当然需要进行更多的研究。我们通过计算机模拟研究了没有交流电源的远程仅负载系统的直流传输性能。在使用VSFC的高压直流系统仿真程序的多次运行中，我们注意到，当施加大扰动时，直流线路电流和直流电压会出现长时间持续振荡。当安装串联直流电抗（DCL）来抑制直流线路电流的高次谐波时，性能会更差。为了提高使用VSFC的高压直流系统的性能，我们研究了在串联直流输电线路中安装L-R并联阻尼器电路。仿真结果表明，DCL和L-R阻尼器串联安装时，抑制高次谐波的效果与单独安装DCL一样有效，并且对振荡的阻尼作用也很大，提高了整个系统的动态性能。
Conventional converter used in an HV DC system needs line volatge to turn off the current flowing through a thyristor or a mercury-arc valve. Hence HV DC system cannot supply electric power to the system which has no AC source, such as a generator or a synchronous condenser, or HV DC system has some difficulties to operate with the weak system. Conventional solution of avoiding these problems is installation of large capacity synchronous condensers, which needs considerable costs of construction and maintenance. Another solution is application of forced commutation converter. The recent development of high power and high frequency semiconductor devicees with fast gate turn-off ability (e. g. GTO's and SI thyristors) suggests the application of voltage source type forced commutation converter (VSFC) to an HV DC system. To ensure the promising characteristics of overall system, more investigation is, of course, necessary. We have been investigated performance of DC transmission into remote load-only system without AC source by means of computer simulation. In many runs of simulation program of HV DC system using VSFC, we noticed that long sutaining oscillation of DC line current and DC voltage occurs when large disturbance is applied. And the performance is worse when series DC reactance (DCL) is installed to suppress higher harmonics of DC line current. For improving the performance of HV DC system using VSFC, we investigated to install the L-R parallel damper circuit in series of DC transmission line. Simulation results when DCL and L-R damper are installed in series show that suppression of higher harmonics is as effective as installation of DCL only and the damping of oscillation is also substantial to improve the dynamic performance of whole system.