| 引用本文: | 旷 玮,江 琴,徐瑞廷,等.基于STATCOM补偿换相电流的SLCC换相失败抑制方法[J].电力系统保护与控制,2026,54(01):28-39.[点击复制] |
| KUANG Wei,JIANG Qin,XU Ruiting,et al.Method for suppressing commutation failure for SLCC based on STATCOM commutation current compensation[J].Power System Protection and Control,2026,54(01):28-39[点击复制] |
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| 摘要: |
| 基于多源自适应换相换流器(multi-source self-adaption line commutated converter, SLCC)的直流输电系统在交流故障下利用静止同步补偿器(static synchronous compensator, STATCOM)补偿无功功率抑制换相失败。然而在严重交流故障下即使达到补偿容量上限仍存在换相失败问题，因此，提出一种基于STATCOM补偿换相电流的抑制方法。首先，分析SLCC直流输电系统拓扑结构和控制策略。其次，通过分析SLCC换相过程发现LCC换相电流由交流电网和STATCOM共同提供。基于此提出通过控制STATCOM输出电流对LCC换相电流进行补偿从而加快换相过程，减小换相重叠角以抑制换相失败。相较于基于无功功率补偿控制方法，所提方法在同样STATCOM容量下换相失败抑制效果更优。最后，基于PSCAD仿真平台搭建了SLCC直流输电系统模型。仿真结果表明，所提方法能有效提升SLCC抵御换相失败的能力。 |
| 关键词: 多源自适应换相换流器 换相失败 静止同步补偿器 谐波滤除 换相电流 |
| DOI：10.19783/j.cnki.pspc.250261 |
| 投稿时间：2025-03-18修订日期：2025-08-08 |
| 基金项目:四川省自然科学基金项目资助(2024NSFSC0865) |
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| Method for suppressing commutation failure for SLCC based on STATCOM commutation current compensation |
| KUANG Wei1,JIANG Qin1,XU Ruiting1,LI Baohong1,LIU Tianqi1,ZHENG Junchao2,TAO Yan2 |
| (1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. State Grid Jiangsu Electric
Power Co., Ltd. Research Institute, Nanjing 211103, China) |
| Abstract: |
| In a DC transmission system based on multi-source self-adaptive line commutated converters (SLCC), commutation failure can be suppressed by configuring STATCOM to compensate reactive power under AC faults. However, under severe AC faults, commutation failure may still occur even when the STATCOM reaches its maximum compensation capacity. To address this issue, a commutation failure suppression method based on STATCOM commutation current compensation is proposed. First, the topology and control strategy of the SLCC-based DC transmission system are analyzed. Second, by examining the SLCC commutation process, it is found that the LCC commutation current is jointly provided by the AC grid and the STATCOM. Based on this, it is proposed to compensate the LCC commutation current by controlling the STATCOM output current to accelerate the commutation process and reduce the commutation overlap angle, thereby suppressing commutation failure. Compared with reactive power compensation based methods, the proposed method achieves better commutation failure suppression under the same STATCOM capacity. Finally, a SLCC DC transmission system model is built on the PSCAD simulation platform. Simulation results show that the proposed method can effectively enhance the ability of SLCC to withstand commutation failures. |
| Key words: SLCC commutation failure STATCOM harmonic filtering commutation current |
