海上风电低频外送系统故障穿越分析

doi:10.19595/j.cnki.1000-6753.tces.250220

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (2866 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract

Fault ride-through of flexible low-frequency transmission is an important issue that needs to be addressed in future applications. During the fault process, it is necessary to ensure the safe operation of the modular multilevel matrix converters (M3C), prevent overcurrent, overvoltage and overcapacity from triggering protection actions and cutting off the M3C, which would prevent the system from crossing the fault. There is only one recent demonstration project for low-frequency transmission of offshore wind power in China, and there is a lack of operational experience in fault ride-through of flexible low-frequency transmission. However, existing literature studies on fault ride-through of flexible low-frequency transmission mainly focus on the power redundancy and unbalanced bridge arm capacitor voltage during the fault period, but lack a systematic analysis of other problems faced by the system during the fault period. This paper systematically analyzes the possible problems faced during fault ride-through of flexible low-frequency transmission to provide a reference for the design of subsequent protection and control strategies.
Firstly, the mathematical model and control strategy of M3C are introduced, and a detailed model of the low-frequency transmission system for offshore wind power is established. Secondly, the transient characteristics of M3C are analyzed through simulation of symmetrical and asymmetrical faults on the fundamental frequency side and low-frequency side of M3C. Finally, based on the transient characteristics of the system under fault conditions, the problems faced by the system in achieving fault ride-through are summarized.
The following conclusions can be drawn from the simulation analysis: (1) Under symmetrical faults on the fundamental frequency side, the main problem faced is the over-limitation of M3C capacitor voltage due to power redundancy. Under asymmetrical faults on the fundamental frequency side, the system faces problems of power redundancy and unbalanced bridge arm capacitor voltage during the fault period, as well as the impact of negative sequence components on system control performance during the fault period. Negative sequence component control can be introduced on the fundamental frequency side system to achieve different negative sequence control objectives. (2) Under symmetrical faults on the low-frequency side, during the fault ride-through period, M3C experiences power reversal, and during the recovery period, the low-frequency system experiences overvoltage problems, but the capacitor of M3C does not experience overvoltage during the ride-through period. During the low-frequency fault period, voltage-frequency control switches to vector control, and there is a coupling problem between low-frequency active and reactive power. Under asymmetrical faults on the low-frequency side, during the fault period, there are problems of unbalanced bridge arm capacitor voltage and overvoltage on the non-fault phase during the ride-through period. Moreover, the strategy of simultaneously suppressing the negative sequence to zero on the low-frequency side and the wind farm grid side may lead to overvoltage problems. (3) Under asymmetrical faults, zero-sequence voltage leaks to the opposite side on the valve side of the converter.

Key words： modular multilevel matrix converters low-frequency transmission systems for offshore wind power fault analysis offshore wind power

Received: 14 February 2025

PACS:

TM614

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Gao Chenjing
	Chen Wuhui
	Zhang Gengwu
	Jiao Meirui

Cite this article:

Gao Chenjing,Chen Wuhui,Zhang Gengwu等. Fault Ride-through Analysis of Offshore Wind Power Low-frequency Transmission System[J]. Transactions of China Electrotechnical Society, 0, (): 20250220-20250220.

URL:

https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250220 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/20250220

[1] 申刘飞, 翟雨佳, 吴星徵, 等. 海上超导风电制氢一体化研究进展与发展趋势[J/OL]. 电工技术学报, 1-22[2025-05-21] . https://doi.org/10.19595/j.cnki.1000-6753.tces.240788.
Shen Liufei, Zhai Yujia, Wu Xingzheng, et al. Progress and development trend of integrated research on hydrogen production from offshore superconducting wind power[J/OL]. Transactions of China Electrotechnical Society, 1-22[2025-05-21] . https://doi.org/10.19595/j.cnki.1000-6753.tces.240788.
[2] 赵国亮, 陈维江, 邓占锋, 等. 柔性低频交流输电关键技术及应用[J]. 电力系统自动化, 2022, 46(15): 1-10.
Zhao Guoliang, Chen Weijiang, Deng Zhanfeng, et al.Key technologies and application of flexible low-frequency AC transmission[J]. Automation of Electric Power Systems, 2022, 46(15): 1-10.
[3] 黄明煌, 王秀丽, 刘沈全, 等. 分频输电应用于深远海风电并网的技术经济性分析[J]. 电力系统自动化, 2019, 43(5): 167-174.
Huang Minghuang, Wang Xiuli, Liu Shenquan, et al.Technical and economic analysis on fractional frequency transmission system for integration of long-distance offshore wind farm[J]. Automation of Electric Power Systems, 2019, 43(5): 167-174.
[4] 王秀丽, 段子越, 孟永庆, 等. 分频输电系统运行特性与控制策略综述[J]. 高电压技术, 2023, 49(9): 3696-3707.
Wang Xiuli, Duan Ziyue, Meng Yongqing, et al.Review on operational characteristics and control strategies of fractional frequency transmission systems[J]. High Voltage Engineering, 2023, 49(9): 3696-3707.
[5] 王秀丽, 赵勃扬, 黄明煌, 等. 大规模深远海风电送出方式比较及集成设计关键技术研究[J]. 全球能源互联网, 2019, 2(2): 138-145.
Wang Xiuli, Zhao Boyang, Huang Minghuang, et al.Research of integration methods comparison and key design technologies for large scale long distance offshore wind power[J]. Journal of Global Energy Interconnection, 2019, 2(2): 138-145.
[6] 张金辉, 江岳文. 提高海缆输送容量的无功补偿策略[J]. 电气技术, 2019, 20(5): 19-23.
Zhang Jinhui, Jiang Yuewen.Reactive power compensation strategy for improving capacity of submarine cable[J]. Electrical Engineering, 2019, 20(5): 19-23.
[7] Liu Shenquan, Wang Xifan, Ning Lianhui, et al.Integrating offshore wind power via fractional frequency transmission system[J]. IEEE Transactions on Power Delivery, 2017, 32(3): 1253-1261.
[8] 郑涛, 康恒. 基于控保协同的柔性低频输电系统电流差动保护性能提升方案[J]. 电工技术学报, 2025, 40(7): 2162-2177.
Zheng Tao, Kang Heng.Improvement of current differential protection performance of flexible low-frequency transmission system based on control and protection cooperation[J]. Transactions of China Electrotechnical Society, 2025, 40(7): 2162-2177.
[9] 刘昊霖, 贾科, 毕天姝, 等. 接入新能源大基地汇集系统的柔直换流站低电压穿越方法研究[J]. 电工技术学报, 2025, 40(3): 759-770.
Liu haolin, Jia Ke, Bi Tianshu, et al. Research on low voltage ridethrough methods for flexible DC converter stations connected to the gathering system of new energy base[J]. Transactions of China Electrotechnical Society, 2025, 40(3): 759-770.
[10] 孙玉巍, 王童, 付超, 等. 适用于海上风电分频输电的模块化多电平矩阵变换器故障穿越控制策略[J]. 高电压技术, 2023, 49(1): 19-30.
Sun Yuwei, Wang Tong, Fu Chao, et al.Fault ride-through control strategy of modular multilevel matrix converter for fractional frequency transmission system[J]. High Voltage Engineering, 2023, 49(1): 19-30.
[11] 赵勃扬, 王锡凡, 宁联辉, 等. 分频海上风电系统的不对称故障穿越控制[J]. 中国电机工程学报, 2023, 43(12): 4589-4600.
Zhao Boyang, Wang Xifan, Ning Lianhui, et al.Ride-through control of fractional frequency offshore wind power system during unsymmetrical grid faults[J]. Proceedings of the CSEE, 2023, 43(12): 4589-4600.
[12] Liu Shenquan, Saeedifard M, Wang Xifan.Analysis and control of the modular multilevel matrix converter under unbalanced grid conditions[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018, 6(4): 1979-1989.
[13] 高校平, 张晨浩, 宋国兵, 等. 海上风电低频输电系统低频侧不对称故障控制策略[J]. 电力自动化设备, 2023, 43(10): 160-166.
Gao Xiaoping, Zhang Chenhao, Song Guobing, et al.Control strategies of offshore wind power low frequency transmission system under asymmetric fault of low-frequency side[J]. Electric Power Automation Equipment, 2023, 43(10): 160-166.
[14] 郑涛, 宋伟男, 吕文轩. 基于M3C的低频输电系统不对称故障穿越控制策略[J]. 电力系统保护与控制, 2023, 51(8): 107-117.
Zheng Tao, Song Weinan, Lü Wenxuan.Asymmetric fault ride-through control strategy for a low frequency AC transmission system based on a modular multilevel matrix converter[J]. Power System Protection and Control, 2023, 51(8): 107-117.
[15] 郑涛, 康恒, 宋伟男. 可实现低频输电系统不对称故障穿越的M3C电容电压均衡控制策略[J]. 电力系统保护与控制, 2023, 51(23): 130-140.
Zheng Tao, Kang Heng, Song Weinan.Asymmetric fault ride-through control strategy for low-frequency transmission systems realizing the capacitor voltage balance of modular multilevel matrix converters[J]. Power System Protection and Control, 2023, 51(23): 130-140.
[16] 孟永庆, 王健, 李磊, 等. 基于双dq坐标变换的M3C变换器的数学模型及控制策略研究[J]. 中国电机工程学报, 2016, 36(17): 4702-4712.
Meng Yongqing, Wang Jian, Li Lei, et al.Research on modeling and control strategy of modular multilevel matrix converter based on double dq coordinate transformation[J]. Proceedings of the CSEE, 2016, 36(17): 4702-4712.
[17] 徐政, 张哲任. 低频输电技术原理之三: M~3C基本控制策略与子模块电压平衡控制[J]. 浙江电力, 2021, 40(10): 30-41.
Xu Zheng, Zhang Zheren.Principles of low frequency power transmission technology: part 3-basic control strategy for the M³C and sub-module voltage balance control[J]. Zhejiang Electric Power, 2021, 40(10): 30-41.
[18] 李峰, 王广柱. 模块化多电平矩阵变换器电容电压纹波稳态分析[J]. 中国电机工程学报, 2013, 33(24): 52-58, 9.
Li Feng, Wang Guangzhu.Steady-state analysis of sub-modular capacitor voltage ripple in modular multilevel matrix converters[J]. Proceedings of the CSEE, 2013, 33(24): 52-58, 9.
[19] 国家市场监督管理总局, 国家标准化管理委员会. 风电场接入电力系统技术规定第2部分:海上风电: GB/T 19963.2—2024[S]. 北京: 中国标准出版社, 2024.
[20] 黄守道, 肖磊, 黄科元, 等. 不对称电网故障下直驱型永磁风力发电系统网侧变流器的运行与控制[J]. 电工技术学报, 2011, 26(2): 173-180.
Huang Shoudao, Xiao Lei, Huang Keyuan, et al.Operation and control on the grid-side converter of the directly-driven wind turbine with PM synchronous generator during asymmetrical faults[J]. Transactions of China Electrotechnical Society, 2011, 26(2): 173-180.