A grid-side fault ride-through method suitable for offshore wind farms connected with MMC-MTDC

被引：0

作者：

Jia K. ^{[1
]}

Dong X. ^{[1
]}

Li J. ^{[1
]}

Li Y. ^{[1
]}

Niu H. ^{[1
]}

Bi T. ^{[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 Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 21期

关键词：

coordinated control; fault ride-through; MMC-MTDC; offshore wind power; unbalanced power;

D O I：

10.19783/j.cnki.pspc.230551

中图分类号：

学科分类号：

摘要：

Offshore wind power projects are progressively expanding into deep seas and using MMC based multi-terminal direct current (MMC-MTDC). When a fault occurs on the shore AC grid side, the offshore wind farms connected to an MMC-MTDC system should have the capability of fault ride-through (FRT). However, existing methods focus on system-level control strategies between grid side converters, without considering the coordination of other converters. This oversight could lead to converter overload during severe faults. Additionally, traditional FRT methods for MMC based two-terminals have not been adapted for MTDC scenarios. This may result in wind farm disconnection. To address the above issues, faults are categorized into scenarios of self-absorption and non-self-absorption first. The unbalanced power is relatively small in the self-absorption scenario, so this paper proposes an over-speed load-shedding control strategy based on the voltage droop method and a slave station voltage deviation droop control strategy considering the power margin combining safe load-shedding capability of wind turbine itself and slave station surplus capacity. The unbalanced power is larger in the non-self-absorption scenario, so this paper proposes FRT control strategies considering normal and abnormal dispatch center communication. Finally, modeling on PSCAD/EMTDC simulation platform show the validity of the proposed control method. © 2023 Power System Protection and Control Press. All rights reserved.

引用

页码：76 / 85

页数：9

共 25 条

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