| 引用本文: | 李岩,仲思为,曹润彬,等.柔直构网的 100% 新能源基地送出线路的故障特性重塑策略[J].电力系统保护与控制,2026,54(11):1-13. |
| LI Yan,ZHONG Siwei,CAO Runbin,et al.Fault characteristics reshaping strategy for outgoing lines of 100% renewable energy bases grid-formed by MMC-HVDC[J].Power System Protection and Control,2026,54(11):1-13 |
|
| 摘要: |
| 建设于沙漠、戈壁、荒漠地区的大规模新能源发电基地，缺乏同步电源支撑，常采用构网柔直外送方案，在送端形成了 100% 新能源、100% 电力电子化的独立交流电网。在新能源交流送出线路发生故障时，故障暂态波动会大幅降低交流线路保护的可靠性。针对该问题，从控保协同角度，提出一种提升交流线路保护可靠性的故障特性重塑策略。首先，分析了传统控制策略下系统故障暂态波动机理及其与保护动作性能劣化之间的关联。然后，通过理论推导，设计了基于滑模控制的负序电流内环控制器，以替代传统比例积分控制器，并提出故障暂态的快速响应策略。最后，在 PSCAD/EMTDC 中建立了柔直构网的新能源基地送端电网的电磁暂态仿真模型，验证了所提故障特性重塑策略能够有效平抑暂态电流波动，进而提升保护可靠性。 |
| 关键词: 柔直 构网 控保协同 故障特性重塑 负序电流控制 滑模控制 交流线路保护 |
| DOI：10.19783/j.cnki.pspc.251324 |
| 分类号: |
| 基金项目:国家自然科学基金联合基金重点支持项目资助 (U23B20112) |
|
| Fault characteristics reshaping strategy for outgoing lines of 100% renewable energy bases grid-formed by MMC-HVDC |
|
LI Yan1, ZHONG Siwei2, CAO Runbin1, PENG Faxi1, HUANG Weihuang1, ZHOU Yongzhi2
|
|
1. State Key Laboratory of HVDC (China Southern Power Grid Electric Power Research Institute), Guangzhou 510663, China; 2. Polytechnic Institute, Zhejiang University, Hangzhou 310015, China
|
| Abstract: |
| Large-scale renewable energy bases located in deserts, the Gobi, and other arid regions often lack synchronous generation support and therefore adopt grid-forming modular multilevel converter-based high voltage direct current (MMC-HVDC) transmission schemes. In such systems, an isolated AC grid with 100% renewable energy and full power electronics is formed at the sending end. When faults occur on the outgoing AC lines, severe transient fluctuations significantly degrade the reliability of AC line protection. To address this issue, a fault characteristic reshaping strategy is proposed from the perspective of control-protection coordination to enhance protection reliability. First, the mechanism of fault transient fluctuations under conventional control schemes and its correlation with the degradation of protection performance are analyzed. Then, through theoretical derivation, a sliding mode control-based inner-loop controller for negative-sequence current is designed to replace the conventional proportional-integral controller, along with a fast transient response strategy. Finally, an electromagnetic transient simulation model of the sending-end grid of a renewable energy base with grid-forming MMC-HVDC is established in PSCAD/EMTDC. Simulation results verify that the proposed fault characteristic reshaping strategy can effectively suppress transient current fluctuations, thereby enhancing protection reliability. |
| Key words: MMC-HVDC grid-forming control-protection coordination fault characteristic reshaping negative-sequence current control sliding mode control AC line protection |
