中国电力 ›› 2025, Vol. 58 ›› Issue (3): 73-85.DOI: 10.11930/j.issn.1004-9649.202405012
• 高比例新能源接入电网的协调控制与优化运行 • 上一篇 下一篇
周国梁1(
), 高丽萍2(), 梁言桥1(), 李文津1(), 王鑫1
收稿日期:2024-05-07
出版日期:2025-03-28
发布日期:2025-03-26
作者简介:基金资助:
Guoliang ZHOU1(), Liping GAO2(), Yanqiao LIANG1(), Wenjin LI1(), Xin WANG1
Received:2024-05-07
Online:2025-03-28
Published:2025-03-26
Supported by:摘要：
新能源、基于模块化多电平换流器的多端柔性直流（modular multilevel converter-based multi-terminal high voltage direct current，MMC-MTDC）以及交流电网之间宽频振荡风险凸出，严重制约MMC-MTDC安全稳定运行和新能源高效消纳。MMC-MTDC各换流站呈现定交流电压、定直流电压、定功率等异构化控制方式，多端换流站之间又存在强非线性耦合，给系统振荡建模与分析带来挑战。为此，首先提出计及正负序控制的MMC-MTDC控制系统模块化建模方法。然后，针对复杂交直流网架结构，建立计及多端非线性耦合的MMC-MTDC不同断面通用化阻抗模型。最后，以三端MMC-MTDC环网为例，仿真验证通用化阻抗建模的准确性和有效性，并分析多端互联系统及正负序控制对阻抗特性的耦合影响，为新能源基地经MMC-MTDC互联系统振荡分析提供基础。
周国梁, 高丽萍, 梁言桥, 李文津, 王鑫. 柔性直流输电系统多端异构通用化阻抗建模与分析[J]. 中国电力, 2025, 58(3): 73-85.
Guoliang ZHOU, Liping GAO, Yanqiao LIANG, Wenjin LI, Xin WANG. Multi-terminal Heterogeneous Generalized Impedance Modeling and Analysis of MMC-MTDC Transmission Systems[J]. Electric Power, 2025, 58(3): 73-85.
图 1 MMC-MTDC互联系统结构
Fig.1 MMC-MTDC interconnection system topology
图 2 基于延时信号消除的正负序分离控制框图
Fig.2 Positive- and negative-sequence separation control block diagram based on delayed signal cancellation
图 3 同步旋转角获取框图
Fig.3 Block diagram of synchronous rotation angle generation
图 4 V/f控制模式下交流电压控制框图
Fig.4 AC voltage control diagram in V/f control mode
图 5 PQ控制框图
Fig.5 PQ control diagram
图 6 Vdc控制框图
Fig.6 DC voltage control diagram
图 7 交流电流控制框图
Fig.7 AC current control diagram
图 8 环流控制框图
Fig.8 Circulating current control diagram
图 9 桥臂调制信号形成框图
Fig.9 Arm modulation signal generation diagram
图 10 节点导纳网络
Fig.10 Node admittance network
图 11 孤岛新能源系统直流送端交流阻抗构成
Fig.11 The structure of AC impedance of MMC in islanded renewable energy system
图 12 三端MMC-MTDC环网系统
Fig.12 Three-terminal MMC-MTDC ring system
图 13 2#孤岛新能源系统对1#孤岛站交流阻抗耦合影响
Fig.13 Influence of 2# renewable energy system on the AC impedance of 1# islanded converter station
图 14 联网站电网强度对1#孤岛站交流阻抗耦合影响
Fig.14 Influence of grid strength of grid-connected station on AC impedance of 1# islanded converter station
图 15 考虑正负序控制前后1#孤岛站交流阻抗对比
Fig.15 Comparison of AC impedance of 1# islanded converter station before and after adopting positive and negative control
图 16 联网站正负序控制对1#孤岛站交流阻抗影响
Fig.16 Influence of positive- and negative-sequence control of grid-connected station on AC impedance of 1# islanded converter station
图 17 MMC直流阻抗模型校核Bode图
Fig.17 Bode diagram of MMC DC impedance model verification
图 18 1#孤岛站接入的直流系统阻抗校核Bode图
Fig.18 Impedance verification Bode diagram of DC system connected to 1# station
图 19 1#孤岛站交流阻抗校核Bode图
Fig.19 AC impedance verification Bode diagram of 1# islanded converter station
图 20 联网站交流阻抗校核Bode图
Fig.20 AC impedance verification Bode diagram of grid-connected converter station
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