Zero-sequence Voltage-suppressing control strategy for MMC-MVDC Without Coupling Transformer

doi:10.3969/j.issn.1000-7229.2018.07.007

Abstract

Abstract: Technology scheme of AC distribution network connected by MMC-HVDC without coupling transformer is introduced. Single-phase fault will cause DC voltage fluctuation in local station and AC voltage distortion in non-faulty station. By analyzing the conduction mechanism of zero-sequence voltage when single-phase ground fault occurred, corresponding zero-sequence voltage-suppressing controller （ZSVSC） is designed. The designed ZSVSC can suppress the fluctuation of DC voltages on positive and negative poles, and realize the AC voltage at non-fault station symmetrical and stable. The MMC-MVDC simulation model with zero-sequence voltage-suppression controller is built on PSCAD / EMTDC simulation platform. Simulation results show the effectiveness of the designed ZSVSC.

Key words: medium voltage distribution network, MMC-MVDC distribution network, single-phase ground fault, zero-sequence voltage-suppressing controller.

CLC Number:

TM 72

LI Gang, TIAN Jie,LU Yu,LI Haiying,LU Yi,QIU Defeng. Zero-sequence Voltage-suppressing control strategy for MMC-MVDC Without Coupling Transformer[J]. Electric Power Construction, 2018, 39(7): 57-63.

References

［1］郑欢.柔性直流配电网的若干问题研究［D］.杭州: 浙江大学,2014.

ZHENG Huan. Research on some problems of DC distribution network［D］. Hangzhou: Zhejiang University, 2014.

［2］甘国晓.配电网合环可行性研究［D］.重庆:重庆大学,2015.

GAN Guoxiao. Feasibility study on closed-loop in distribution networks［D］. Chongqing: Chongqing University, 2015.

［3］江道灼, 郑欢. 直流配电网研究现状与展望［J］. 电力系统自动化, 2012, 36（8）: 98-104.

JIANG Daozhuo, ZHENG Huan. Research status and developing prospect of DC distribution network［J］. Automation of Electric Power Systems, 2012, 36（8） : 98- 104.

［4］顾益磊, 唐庚, 黄晓明,等. 含多端柔性直流输电系统的交直流电网动态特性分析［J］.电力系统自动化, 2013, 37（15）: 27-34.

GU Yilei, TANG Geng, HUANG Xiaoming, et al. Dynamic characteristic analysis of hybrid AC/DC power grid with multi-terminal HVDC based on modular multilevel converter［J］. Automation of Electric Power Systems, 2013, 37（15） : 27- 34.

［5］李庚银，吕鹏飞，李广凯，等.轻型高压直流输电技术的发展与展望［J］. 电力系统自动化, 2003，27（4）:77-81.

LI Gengyin, L Pengfei, LI Guang kai, et al. Development and prospects for HVDC light［J］. Automat ion of Electric Power Systems, 2003, 27（4） : 1- 5.

［6］SONG H S，NAM K. Dual current control scheme for PWM converter under unbalance input voltage conditions［J］. IEEE Transcation on Industial Electronics,1999,46（5）:953-959.

［7］管敏渊，徐政. 模块化多电平换流器型直流输电的建模与控制［J］.电力系统自动化, 2010, 34（19）: 64-68.

GUAN Minyuan，XU Zheng．Modeling and control of modular multilevel converter in HVDC transmission［J］．Automation of Electric Power Systems，2010, 34（19）: 64-68.

［8］黄华. 柔性直流输电在城市电网中应用的可行性［J］. 电气技术, 2011（8）: 29-32.

HUANG Hua．The application of VSC-HVDC in urban power grid［J］．Electrical Engineering, 2011（8）:29-32.

［9］刘国伟，赵彪，赵宇明，等. 中压柔性直流配电技术在深圳电网的应用框架［J］. 南方电网技术，2015, 9（9）:1-10.

LIU Guowei, ZHAO Biao，ZHAO Yuming, et al. Application framework of VSC Medium-voltage DC distribution technology in Shenzhen power grid［J］.South Power System Technology, 2015, 9（9）：1-10.

［10］余潇潇，张璞，张凯. 柔性直流背靠背装置在北京配电网中的应用［J］.电力建设,2016, 37（5）:132-137.

YU Xiaoxiao, ZHANG Pu, ZHANG Kai. Application of VSC-HVDC back-to-back device in Beijing distribution net-work［J］.Electric Power Construction, 2016, 37（5）：132-137.

［11］LESNICAR A, MARQUARDT R. An innovative modular multilevel converter topology suitable for a wide power range［C］//Proceedings of IEEE Power Tech Conference. Bologna,Italy: IEEE, 2003:1-6.

［12］胡兆庆，田杰，董云龙，等. 模块化多电平柔性直流系统网侧故障控制策略及验证［J］.电力系统自动化,2013, 37（14）: 71-75,108.

HU Zhaoqin,TIAN Jie, DONG Yunlong, et al．A control strategy for modular multilevel converter based HVDC flexible systems under system faults and its verification［J］.Automation of Electric Power Systems,2013, 37（14）: 71-75,108.

［13］董云龙，凌为家，田杰，等. 舟山多端柔性直流输电控制保护系统［J］. 电力自动化设备, 2016, 36（7）: 169-174.

DONG Yunlong, LING Jiawei, TIAN Jie, et al．Control ＆ protection system for Zhoushan multi-terminal VSC-HVDC［J］ . Electric Power Automation Equipment,2016, 36（7）:169-174.

［14］GUAN Mingyuan，XU Zheng. Modeling and control of a modular multilevel converter-based HVDC system under unbalanced grid conditions［J］. IEEE Transactions on Power Electronics, 2012，27 （12）：4858-4867.

［15］薛永瑞,郭丽伟，张林利，等．有源配电网中性点接地方式的选择问题［J］.电力系统自动化,2015, 39（13）: 129-136.

XUE Yongrui,GUO Liwei, ZHANG Linli, et al. Selection problems of neutral grounding mode in active distribution networks［J］.Automation of Electric Power Systems,2015, 39（13）: 129-136.

［16］王辉.10 kV配电网中性点接地方式的研究［D］. 天津：天津大学,2006.

WANG Hui. Study on neutral grounding mode for 10 kV power distribution network［D］. Tianjin: Tianjin University, 2006.

［17］蒋心译, 徐永生. 中性点经小电阻接地系统接地保护方案探讨［J］.上海电力学院学报, 1998, 14（2）: 6-11.

JIANG Xinyi, XU Yongsheng. Discuss on earthing protection scheme in neutral grounded with low-resistance distributed system［J］.Journal of Shanghai Institute of Electric Power,1998, 14（2）: 6-11.

［18］夏天.小电阻接地系统继电保护的研究和整定计算［D］.北京:清华大学,2005.

XIA Tian. Research and calculation of relay protection in low-resistance grounding system［D］. Beijing: Tsinghua University, 2005.

［19］刘钟淇,宋强,刘文华.采用MMC变流器的VSC-HVDC系统故障态研究［J］.电力电子技术,2010,44（9）: 69-71.

LIU ZHongqi,SONG Qiang,LIU Wenhua. Research on the VSC-HVDC system using modular multilevel converters under fault condition［J］.Power Electronics, 2010, 44（9）：69-71.

［20］WANG P, ZHANG X P, COVENTRY P F, et al. Control and protection strategy for MMC MTDC system under converter-side AC fault during converter blocking failure［J］. Journal of Modern Power Systems & Clean Energy, 2014, 2（3）:272-281.

［21］陈海荣,张静,屠卿瑞.电网电压不平衡时电压源换流器型直流输电的负序电压补偿控制［J］.高电压技术,2011,37（10）, 2363-2369.

CHEN Hairong, ZHANG Jing, TU Qingrui. Negative voltage compensating control of voltage source converter based HVDC system under unbalanced grid conditions［J］. High Voltage Engineering, 2011，37（10）: 2363-2369.

［22］催恒荣，郭从良. 中性点经消弧线圈和电阻接地系统电感和电阻的取值分析［J］.低压电器, 2007（17）: 32-35.

CUI Hengrong, GUO Conglian. Analysis on inductance and resistance for grounding system with peterson coils and resistors in neutral point［J］. Low Voltage Apparatus, 2007（17）:32-35．

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