直流控制系统对直流近区交流线路短路电流幅值的影响
樊佳辉，都洪基
（南京理工大学，江苏 南京 210094）
摘 要：在故障期间良好的直流控制系统可以减少故障对电网的伤害。介绍了目前主流的直流控制系统逆变侧的结构及其主要参数，分析了控制系统的低压限流、最大触发角控制、电流放大器和换相失败预测等环节的基本结构，通过PSCAD/EMTDC 软件搭建仿真模型，在故障期间分别限制不同控制环节的信号输出，研究其对短路电流幅值的影响，指出换相失败预测环节是影响直流近区交流线路短路电流幅值的直接因素，最大触发角控制和电流放大器环节间接影响短路电流幅值。
关键词：交直流混联系统；短路故障；短路电流；换相失败；直流控制系统
中图分类号：TM761；TM921.5 文献标识码：A 文章编号：1007-3175(2016)08-0010-05
Impacts of Direct Current Control System onAlternating Current CircuitShort-Circuit CurrentAmplitude near Direct Current Region
FAN Jia-hui, DU Hong-ji
（Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: During malfunction a good direct current control system could reduce harm to grid from faults. Introduction was made to the structure of the main stream direct current control system at the side of inverter side and its major parameter at present. Analysis was made to the basic structure of low-voltage current-limiting, maximum firing angle control, current amplifier and commutation defeating prediction etc links. The software PSCAD/EMTDC was used to construct the simulation model. During malfunction the signal outputs of different control links were limited. This paper studied its impact on the short-circuit current amplitude, and pointed out that the commutation defeating prediction link is the direct factor influencing on the alternating current circuit short-circuit current amplitude near direct current region and the maximum firing angle control and current amplifier links indirectly affect on the short-circuit current amplitude.
Key words: alternating current and direct current parallel serial system; short-circuit fault; short-circuit current; commutation defeating; direct current control system
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