| 引用本文: | 黄炳政,陈俊儒,刘牧阳,等.基于自适应虚拟阻抗的构网型变流器暂态稳定性提升策略研究[J].电力系统保护与控制,2025,53(12):57-68.[点击复制] |
| HUANG Bingzheng,CHEN Junru,LIU Muyang,et al.Grid-forming converter transient stability enhancement strategy based on adaptive virtual impedance[J].Power System Protection and Control,2025,53(12):57-68[点击复制] |
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| 摘要: |
| 在电网故障期间，构网型变流器(grid-forming converter, GFC)切换至限流模式将引起功率输出不可控，并可能导致暂态失稳。为了确保GFC在故障期间能够同时满足电流限制并保持与系统同步稳定的要求，同时解决故障清除后出现的暂态过电流问题，提出了一种提升暂态稳定性的自适应虚拟阻抗控制策略。首先，基于GFC暂态运行的功角曲线分析，提出了GFC的暂态稳定运行条件。其次，分析暂态过程中虚拟阻抗对故障过电流限制和同步稳定性的影响规律，提出了一种自适应虚拟电感的闭环控制策略来提高同步稳定性，并采用自适应虚拟电阻限制故障过电流。最后，通过单机无穷大系统硬件在环实验测试和8总线系统仿真，验证了所提控制策略在故障期间不仅可以有效限制故障过电流和稳定输出功率，并在故障恢复瞬间不产生峰值功率和电流。 |
| 关键词: 构网型变流器 暂态稳定性 虚拟阻抗 电流限制 同步稳定性 |
| DOI：10.19783/j.cnki.pspc.241138 |
| 投稿时间：2024-08-28修订日期：2025-01-22 |
| 基金项目:新疆维吾尔自治区科技厅重大科技专项资助(2022A01004-1) |
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| Grid-forming converter transient stability enhancement strategy based on adaptive virtual impedance |
| HUANG Bingzheng,CHEN Junru,LIU Muyang,ZHONG Weilin |
| (School of Electrical Engineering, Xinjiang University, Urumqi 830046, China) |
| Abstract: |
| During grid faults, grid-forming converters (GFC) switch to current limiting operation, which can lead to uncontrollable power output and potential transient instability. To ensure GFC can meet the requirements of current limiting and maintaining synchronization stability with the system during faults, while also addressing transient overcurrent issue following fault clearance, an adaptive virtual impedance control strategy is proposed to improve transient stability. First, based on the analysis of power-angle curve during GFC transient operation, the transient stability conditions for GFC are established. Then, the impact of virtual impedance on fault current limiting and synchronization stability during transients is analyzed. An adaptive virtual inductance closed-loop control strategy is proposed to enhance synchronization stability, while an adaptive virtual resistance is employed to limit fault overcurrent. Finally, hardware- in-the-loop tests on a single-machine infinite-bus system and simulations on an 8-bus system are conducted to validate the effectiveness of the proposed control strategy. Results show that the strategy effectively limits fault overcurrent, maintains stable power output during faults, and avoids peak power and current spikes upon fault recovery. |
| Key words: grid-forming converter transient stability virtual impedance current limiting synchronization stability |
