直流控制系統(tǒng)對直流近區(qū)交流線路短路電流幅值的影響
樊佳輝，都洪基
（南京理工大學，江蘇 南京 210094）
摘 要：在故障期間良好的直流控制系統(tǒng)可以減少故障對電網的傷害。介紹了目前主流的直流控制系統(tǒng)逆變側的結構及其主要參數，分析了控制系統(tǒng)的低壓限流、最大觸發(fā)角控制、電流放大器和換相失敗預測等環(huán)節(jié)的基本結構，通過PSCAD/EMTDC 軟件搭建仿真模型，在故障期間分別限制不同控制環(huán)節(jié)的信號輸出，研究其對短路電流幅值的影響，指出換相失敗預測環(huán)節(jié)是影響直流近區(qū)交流線路短路電流幅值的直接因素，最大觸發(fā)角控制和電流放大器環(huán)節(jié)間接影響短路電流幅值。
關鍵詞：交直流混聯(lián)系統(tǒng)；短路故障；短路電流；換相失敗；直流控制系統(tǒng)
中圖分類號：TM761；TM921.5 文獻標識碼：A 文章編號：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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