DC fault characteristic analysis and recovery control strategy for hybrid cascaded HVDC system

被引：0
|
作者：
Yang S. [1 ]
Zheng A. [1 ]
Peng Y. [1 ]
Guo C. [1 ]
Zhao C. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 09期
基金：
中国国家自然科学基金;
关键词：
DC fault characteristic; Hybrid cascaded HVDC system; Power step characteristic; Recovery control strategy;
D O I：
10.16081/j.epae.201909049
中图分类号：
学科分类号：
摘要：
The hybrid cascaded HVDC system composed of LCC at rectifier side and MMC in series with LCC at inverter side can realize DC fault ride-through, commutation failure suppression and large capacity power transmission. The model of hybrid cascaded HVDC system is established and an overall control strategy is designed. The dynamic characteristics of the system with step power are researched by PSCAD/EMTDC simulation software, which verifies the effectiveness of the proposed control strategy. The DC fault characteristics of the system are simulated and analyzed, and it is found that if proper measures are not taken, the over-current phenomenon caused by unbalanced current distribution between parallel MMCs when DC fault occurs and large fluctuation problem in system recovery process after fault clearing will appear, for which, a fault recovery control strategy during fault and after fault clearing is proposed, and simulation verifies the effectiveness of the control strategy. © 2019, Electric Power Automation Equipment Press. All right reserved.
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页码：166 / 172and179
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