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±420 kV渝鄂直流背靠背联网工程系统设计
作者:
作者单位:

国网经济技术研究院有限公司,北京市102209

摘要:

与前期工程相比,渝鄂工程系统设计的主要难点在于工程直流电压较高、容量较大,且故障穿越、交直流保护等要求提升,但全控电力电子器件的暂态应力水平受限且交流电网极端方式恶化。针对器件暂态应力水平受限,文中提出了精确的换流器桥臂故障电流上升率计算方法、阀控过流保护的分桥臂闭锁策略、阀本体过压保护的动态过压定值策略,解决了弱器件能力下无法兼顾设备安全性和故障穿越能力的问题。针对极端方式下交流电网和柔性直流系统高频失稳和弱系统失稳问题,分别提出了失稳机理及解决失稳的工程实用方法。针对接入500 kV交流电网带来交流断路器失灵保护和直流差动保护的特殊要求,提出了相应的解决对策和建议。

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基金项目:

国家重点研发计划资助项目(2016YFB0900905);国家电网公司科技项目(SGSDJY00JHJS1900210)。

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作者简介:


System Design of ±420 kV Chongqing-Hubei Back-to-Back HVDC Project of China
Author:
Affiliation:

State Grid Economic and Technological Research Institute CO., Ltd., Beijing 102209, China

Abstract:

Compared with the previous projects, the main difficulties in the system design of Chongqing-Hubei project of China are that the engineering DC voltage is higher, capacity is larger, requirements for fault ride-through and AC/DC protection etc. are improved, but the transient stress level of fully-controlled power electronic devices is limited and the extreme mode of AC power grid deteriorates. In view of the limited transient stress level of the device, this paper proposes the accurate calculation method of rising rate for the arm fault current in the converter, the independent arm blocking strategy of overcurrent protection for valve base controller, the dynamic setting strategy of valve over-voltage protection. They solve the problem that the device safety and fault ride-through capability cannot be taken into account under the weak device capability. Aiming at the problems of high-frequency instability and weak-system instability of AC grid and flexible DC system in extreme modes, the instability mechanism and the practical engineering methods solving the instability are proposed. To meet the special requirements of AC breaker failure the protection and DC differential protection under the access of 500 kV AC power grid, the corresponding solutions and advices are proposed.

Keywords:

Foundation:
This work is supported by National Key R&D Program of China (No. 2016YFB0900905) and State Grid Corporation of China (No. SGSDJY00JHJS1900210).
引用本文
[1]潘尔生,乐波,梅念,等.±420 kV渝鄂直流背靠背联网工程系统设计[J/OL].电力系统自动化,http://doi. org/10.7500/AEPS20200518007.
PAN Ersheng, YUE Bo, MEI Nian, et al. System Design of ±420 kV Chongqing-Hubei Back-to-Back HVDC Project of China[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20200518007.
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  • 收稿日期:2020-05-18
  • 最后修改日期:2020-11-09
  • 录用日期:2020-08-24
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