直流孤岛系统低次谐波稳定性仿真研究

doi:10.11930/j.issn.1004-9649.2015.12.129.6

中国电力 ›› 2015, Vol. 48 ›› Issue (12): 129-135.DOI: 10.11930/j.issn.1004-9649.2015.12.129.6

直流孤岛系统低次谐波稳定性仿真研究

刘洪涛¹, 张勇¹, 梅勇¹, 周煜智², 徐政²

1. 中国南方电网电力调度控制中心,广东广州 510623;
2. 浙江大学电气工程学院,浙江杭州 310007

收稿日期:2015-09-30 出版日期:2015-12-18 发布日期:2015-12-30
作者简介:刘洪涛（1974—）,男,山东招远人,博士,高级工程师,从事电力系统安全稳定分析与控制相关工作。E-mail: liuht@csg.cn

Simulation Study of Low Order Harmonic Stability for Islanded HVDC Systems

LIU Hongtao¹, ZHANG Yong¹, MEI Yong¹, ZHOU Yuzhi², XU Zheng²

1. China Southern Power Grid Dispatching Control Center, Guangzhou 510623, China;
2. Department of Electric Engineering, Zhejiang University, Hangzhou 310027, China

Received:2015-09-30 Online:2015-12-18 Published:2015-12-30

摘要/Abstract

摘要： 针对南方电网牛从和普侨两个直流输电工程孤岛运行状态下的低次谐波稳定性问题,在PSCAD/EMTDC中搭建了详细的时域仿真模型并进行仿真研究。首先,使用测试信号法在一定频率范围内扫描直流输电系统直流回路阻抗和交流并联阻抗。其次,通过分析比较低次谐波频率下直流回路阻抗与交流并联阻抗之间的大小关系,对直流系统的低次谐波稳定性进行初步判断。最后,用时域仿真法对可能出现低次谐波振荡的工况进行校核。计算结果表明,在孤岛运行方式下,交流系统短路比的变化对直流回路阻抗和交流并联阻抗的阻抗频率特性有一定影响,随着短路比减小,阻抗频率特性向左上方偏移。此外,在所考虑的孤岛运行方式与故障情况下,直流系统均不会发生低次谐波不稳定现象。

关键词: 时域仿真, 低次谐波稳定性, 测试信号法, 谐波阻抗分析, 交流系统短路比

Abstract: Based on the detailed digital simulation models of Niucong and Puqiao HVDC systems, this paper studies the low order harmonic stability under islanded operation condition. Firstly, the ac parallel impedance and dc loop impedance of the HVDC systems are calculated with the test signal method. Then, the low order harmonic stability of the HVDC is roughly checked by analyzing the ac parallel impedance and dc loop impedance under low order harmonic frequencies. Finally, the low order harmonic stability is verified by time domain simulation. The result shows that under islanded operation condition, the harmonic impedance of the HVDC system is slightly influenced by the short circuit ration of the connected ac system. Additionally, the HVDC systems don`t have the low order harmonic instability problems under the concerned operation conditions.

Key words: time domain simulation, low order harmonic stability, test signal method, harmonic impedance analysis, short circuit ratio (SCR)

中图分类号:

TM711

刘洪涛, 张勇, 梅勇, 周煜智, 徐政. 直流孤岛系统低次谐波稳定性仿真研究[J]. 中国电力, 2015, 48(12): 129-135.

LIU Hongtao, ZHANG Yong, MEI Yong, ZHOU Yuzhi, XU Zheng. Simulation Study of Low Order Harmonic Stability for Islanded HVDC Systems[J]. Electric Power, 2015, 48(12): 129-135.

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https://www.electricpower.com.cn/CN/Y2015/V48/I12/129

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直流孤岛系统低次谐波稳定性仿真研究

Simulation Study of Low Order Harmonic Stability for Islanded HVDC Systems

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直流孤岛系统低次谐波稳定性仿真研究

Simulation Study of Low Order Harmonic Stability for Islanded HVDC Systems

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