| 引用本文: | 李国庆,张 林,江守其,辛业春.风电经双极混合型MMC-HVDC并网的直流故障
穿越协调控制策略[J].电力系统保护与控制,2021,49(10):27-36.[点击复制] |
| LI Guoqing,ZHANG Lin,JIANG Shouqi,XIN Yechun.Coordinated control strategies for DC fault ride-through of wind power integration via bipolar hybrid MMC-HVDC overhead lines[J].Power System Protection and Control,2021,49(10):27-36[点击复制] |
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| 摘要: |
| 架空线MMC-HVDC是大规模风电友好型并网和可靠送出的有效手段。针对架空线故障率高的问题，采用对称双极接线方式和具备故障阻断能力的混合型MMC是其主要解决方案之一。基于此方案提出了风电经双极混合型MMC-HVDC并网的直流故障穿越协调控制策略。通过混合型MMC零直流电压控制实现了故障电流的有效阻断，并维持了故障极MMC对交流电压的支撑能力。基于对称双极接线方案运行方式灵活的特点，根据故障极功率能否被非故障极完全吸收，分别提出了自吸收和非自吸收工况下非故障极MMC的控制策略及其参数调整原则。并基于风电场频率响应能力设计了无需通信的精确减载控制策略，以实现非故障极MMC满载运行，在维持系统安全稳定运行的同时降低对受端交流系统的影响。最后，基于Matlab/Simulink搭建并网系统模型，验证了所提直流故障穿越协调控制策略的有效性。 |
| 关键词: 风电并网 对称双极柔性直流系统 零直流电压 直流故障穿越 协调控制策略 |
| DOI：DOI: 10.19783/j.cnki.pspc.200880 |
| 投稿时间：2020-07-25修订日期：2020-09-08 |
| 基金项目:国家电网公司总部科技项目资助(5102- 201999343A-0-0-00) |
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| Coordinated control strategies for DC fault ride-through of wind power integration via bipolar hybrid MMC-HVDC overhead lines |
| LI Guoqing,ZHANG Lin,JIANG Shouqi,XIN Yechun |
| (Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology,
Ministry of Education (Northeast Electric Power University), Jilin 132012, China) |
| Abstract: |
| The overhead line MMC-HVDC is an effective method for large-scale wind-power-friendly grid connection and reliable delivery. Faced with the high failure rate of overhead lines, a scheme of adopting symmetrical bipolar wiring and hybrid MMC with fault blocking capability is one of the main methods of tackling this. Based on this scheme, this paper proposes a DC fault ride-through coordinated control strategy for grid-connected wind power via a bipolar hybrid MMC-HVDC. Through hybrid MMC zero DC voltage control, the fault current is effectively blocked and the support ability of the fault pole MMC to the AC voltage is maintained. Based on the flexible operation mode of the symmetrical bipolar wiring scheme, and according to whether the fault pole power can be completely absorbed by non-fault poles, the control strategies of non-fault pole under self-absorption and non-self-absorption conditions and parameter adjustment principles are designed. Based on the frequency response capability of the wind farm, a control strategy without communication is designed to achieve accurate load reduction of wind power, and then achieve full load operation of a non-faulty MMC. This scheme could reduce the impact on the receiving AC system while maintaining the safe and stable operation of the system. Finally, a grid-connected system model is built on Matlab/Simulink to verify the effectiveness of the proposed DC fault ride-through coordinated control strategy.
This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China (No. 5102-201999343A-0-0-00). |
| Key words: wind power integration bipolar MMC-HVDC zero DC voltage control DC fault ride-through coordinated control strategy |
