| 引用本文: | 王 亮,史宇欣,陶文彪,等.基于正交互能量梯度的直流孤岛协同稳定控制方法[J].电力系统保护与控制,2025,53(16):86-96.[点击复制] |
| WANG Liang,SHI Yuxin,TAO Wenbiao,et al.Cooperative stability control method of DC island based on positive interaction energy gradient[J].Power System Protection and Control,2025,53(16):86-96[点击复制] |
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| 摘要: |
| 针对高压直流输电系统进入孤岛运行状态因功率不平衡导致频率失稳的问题，提出一种基于正交互能量梯度的直流孤岛协同控制方法。首先，建立了直流孤岛系统的动态数学模型，构建了动态能量模型。然后，提取表征不同子系统之间的交互能量项，定量评价出正交互能量是劣化系统稳定性的直接因素。在此基础上，协同调节风机有功外环指令值以及整流器电流指令值，补偿直流孤岛系统的正交互能量，从而实现送端电网功率差额的紧急补偿和频率稳定的快速恢复。最后，在RT-LAB平台搭建了直流孤岛外送系统模型对所提方法进行验证。实验结果表明，提出的直流孤岛协同控制方法可以显著降低正交互能量对系统稳定性的不利影响，实现系统频率的快速平稳恢复。 |
| 关键词: 直流孤岛外送系统 交互能量 协同控制 频率稳定性 |
| DOI：10.19783/j.cnki.pspc.241214 |
| 投稿时间：2024-09-08修订日期：2024-12-16 |
| 基金项目:国家自然科学基金重点项目资助(52130709)；国网山西省电力公司科技项目资助(520530230007) |
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| Cooperative stability control method of DC island based on positive interaction energy gradient |
| WANG Liang1,SHI Yuxin1,TAO Wenbiao1,MA Jing2,ZHAO Yufeng2,WANG Bozong2,BAI Zhongyao2 |
| (1. State Grid Shanxi Electric Power Research Institute, Taiyuan 030001, China; 2. State Key Laboratory of New
Energy Power System (North China Electric Power University), Beijing 102206, China) |
| Abstract: |
| To address the issue of frequency instability caused by power imbalance when a HVDC transmission system enters islanded operation, a cooperative control method for DC islanded systems based on positive interactive energy gradient is proposed. First, a dynamic mathematical model of the DC island system is established, along with a corresponding dynamic energy model. Then, the interaction energy terms between different subsystems are extracted, and the positive interaction energy is quantitatively evaluated as a direct factor that degrades system stability. On this basis, the method coordinates the regulation of the outer-loop active power reference of wind turbines and the current reference of rectifiers to compensate the positive interaction energy of the DC islanded system. This enables emergency compensation for the power difference between the power grid at the sending end and rapid restoration of frequency stability. Finally, a DC islanded system model is built on the RT-LAB platform to verify the proposed method. The experimental results show that the proposed cooperative control method for DC islanded systems can significantly reduce the negative influence of positive interaction energy on system stability and realize rapid and stable recovery of system frequency. |
| Key words: DC islanded transmission system interaction energy cooperative control frequency stability |
