| 引用本文: | 黄劼睿,刘昕宇,高熠莹,等.新能源基地经LCC-HVDC送出系统动态交互机制及暂态过电压风险评估[J].电力系统保护与控制,2025,53(12):139-151. |
| HUANG Jierui,LIU Xinyu,GAO Yiying,et al.Dynamic interaction mechanism and transient overvoltage risk assessment of renewable energy base connected via LCC-HVDC transmission system[J].Power System Protection and Control,2025,53(12):139-151 |
|
| 摘要: |
| 针对新能源经LCC-HVDC外送系统直流换相失败下的送端系统暂态过电压问题，提出了一种送端系统暂态过电压风险评估方法。首先，分析了换相失败下新能源和直流系统间的动态交互作用机制，研究了该交互作用下送端系统电压幅值的暂态变化规律。其次，提出了计及直流线路动态、多控制环节耦合作用的暂态过电压评估方法。之后，提出了量化送端系统暂态过电压安全边界的临界短路比，实现了暂态过电压风险评估，并分析了交直流系统耦合作用对暂态过电压评估的影响。最后，通过在PSCAD内搭建的新能源经LCC-HVDC外送系统仿真模型，验证了暂态过电压风险评估方法的准确性与有效性。 |
| 关键词: LCC-HVDC 换相失败 动态交互机制 暂态过电压 电网强度 |
| DOI：10.19783/j.cnki.pspc.241137 |
| 分类号: |
| 基金项目:国家电网公司总部科技项目资助(5100- 202355810A-3-8-KJ) |
|
| Dynamic interaction mechanism and transient overvoltage risk assessment of renewable energy base connected via LCC-HVDC transmission system |
|
HUANG Jierui1, LIU Xinyu1, GAO Yiying2, HU Diangang3, MA Xiping4, XIN Huanhai1
|
|
1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; 2. China Electric Power Research
Institute, Beijing 100192, China; 3. State Grid Gansu Electric Power Company, Lanzhou 730050, China;
4. State Grid Gansu Electric Power Research Institution, Lanzhou 730070, China
|
| Abstract: |
| Aiming at the transient overvoltage at the sending end system caused by commutation failure in LCC-HVDC transmission systems for renewable energy integration, a risk assessment method for transient overvoltage at the sending end is proposed. First, the dynamic interaction mechanism between the renewable energy and DC transmission system under commutation failure is analyzed, and the transient voltage amplitude variation characteristics at the sending end under such interaction are studied. Then, a transient overvoltage assessment method considering the coupling effect of DC line dynamics and multi-control links is proposed. Furthermore, a critical short circuit ratio is introduced to quantify the transient overvoltage safety margin at the sending end, enabling the risk assessment of the transient overvoltage and analyzing the influence of the coupling effect of the AC-DC system on the transient overvoltage assessment. Finally, using a PSCAD simulation model of a renewable energy transmission system using LCC-HVDC, the accuracy and effectiveness of the transient overvoltage risk assessment method are verified. |
| Key words: LCC-HVDC commutation failure dynamic interaction mechanism transient overvoltage grid strength |
