DAI Zhihui,ZHU Huijun,SU Huaibo,et al.DC line protection scheme for modular multilevel converter station considering coordination of AC and DC sides[J].Electric Power Automation Equipment,2019,39(09):109-115.
DAI Zhihui,ZHU Huijun,SU Huaibo,et al.DC line protection scheme for modular multilevel converter station considering coordination of AC and DC sides[J].Electric Power Automation Equipment,2019,39(09):109-115.DOI: 10.16081/j.epae.201909011.
DC line protection scheme for modular multilevel converter station considering coordination of AC and DC sides
In the protection of converter station,the coordination between AC and DC protections has not been fully addressed,and the tripping speed of DC protection is not quick enough and the fault area is difficult to be identified accurately. Therefore,an approach for discriminating AC and DC faults near MMC(Modular Multilevel Converter) station is proposed based on characteristics of DC-side second harmonic current and AC-side negative-sequence current before and after the blocking of MMC,which can effectively distinguish AC faults from DC ones and determine the fault area. On this basis,a DC protection scheme for MMC station considering the coordination between AC and DC side protections is proposed. Finally, the feasibility of the AC/DC fault discrimination approach and the reliability of the DC protection scheme considering the coordination between AC and DC side protections are verified by the PSCAD/EMTDC model of a photovoltaic grid-connected system. Results demonstrate that the proposed approach can discriminate AC and DC faults while being slightly affected by the transition resistance.
SI Zhilei , LU Yi , HAN Kun , et al . Fast fault clearance and system recovery technology of MMC based on bridge-arm damping valve groups [J]. Electric Power Automation Equip-ment , 2018 , 38 ( 4 ): 60 - 67,74 .
LI Bin , HE Jiawei , FENG Yadong , et al . Key techniques for protection of multi-terminal flexible DC grid [J]. Automation of Electric Systems , 2016 , 40 ( 21 ): 2 - 12 .
ZHENG Tao , WU Dan , SONG Jieying . The AC side fault characteristics and protection scheme of the unified power flow controller based on MMC [J]. Power System Technology , 2015 , 39 ( 12 ): 3570 - 3577 .
SUN Xiaoyun , GAO Xin , TONG Xiangqian . Fault diagnosis algorithm for converter of VSC-HVDC system with failed valve arm blocking [J]. Electric Power Automation Equipment , 2018 , 38 ( 10 ): 121 - 126 .
PU Ying , LI Xuan , MA Yulong , et al . Control and protection system scheme on UHVDC with hierarchical connection to 500 kV/1 000 kV AC systems [J]. Power System Technology , 2016 , 40 ( 10 ): 3081 - 3087 .
DAI Zhihui , GE Hongbo , CHEN Bingyan , et al . Line protection schemes for flexible medium voltage DC distribution networks [J]. Automation of Electric Power Systems , 2017 , 41 ( 17 ): 78 - 86 .
ZHANG Haiqiang , LIN Sheng , LIU Lei , et al . Grounding fault location scheme of HVDC rectifier based on the action of DC differential protection [J]. Power System Technology , 2018 ,2018, 42 ( 8 ): 2382 - 2390 .
CHENG Jingzhou , XU Zheng , ZHANG Jing . Influence of transverse faults in HVAC power system on HVDC 100 Hz protection of HVDC transmission system and analysis on its characteristics [J]. Power System Technology , 2011 , 35 ( 9 ): 223 - 228 .
HE Jinghan , HUANG Weibo , LI Haiying , et al . FBMMC DC fault ride-through mechanism and fault clearing strategy [J]. Electric Power Automation Equipment , 2017 , 37 ( 10 ): 1 - 7 .
LESNICAR A , MARQUARDT R . An innovative modular multilevel converter topology suitable for a wide power range [C]∥ 2003 IEEE Bologna Power Tech Conference Procee-dings . Bologna,Italy : IEEE , 2003 : 1 - 6 .
LI J , KONSTANTINOU G , WICKRAMASINGHE H R , et al . Im-pact of circulating current control in capacitor voltage ripples of modular multilevel converters under grid imbalances [J]. IEEE Transactions on Power Delivery , 2018 , 33 ( 3 ): 1257 - 1267 .
LU M , HU J , ZENG R , et al . Imbalance mechanism and ba-lanced control of capacitor voltage for a hybrid modular multilevel converter [J]. IEEE Transactions on Power Elec-tronics , 2018 , 33 ( 7 ): 5686 - 5696 .
SHI X , WANG Z , LIU B , et al . Steady-state modeling of mo-dular multilevel converter under unbalanced grid conditions [J]. IEEE Transactions on Power Electronics , 2015 , 32 ( 9 ): 7306 - 7324 .
ZHAO Chengyong , LI Tan , YU Lujie , et al . DC pole-to-ground fault characteristic analysis and converter fault recovery strategy of MMC-HVDC [J]. Proceedings of the CSEE , 2014 , 34 ( 21 ): 3518 - 3526 .
DAI Zhihui , ZHU Huijun , YAN Siqi , et al . Influence of clamp double submodule-modular multilevel converter AC-side faults on DC-side quantities [J]. Proceedings of the CSEE , 2018 , 38 ( 12 ): 3568 - 3577 .
DAI Zhihui , GE Hongbo , YAN Siqi , et al . Effects of groun-ding mode on fault characteristics in flexible DC distribution system [J]. Power System Technology , 2017 , 41 ( 7 ): 2353 - 2362 .
HE Jinghan , ZHOU Lin , LUO Guomin , et al . Transient protection based on single-end electrical signals for multi-terminal flexible DC distribution system [J]. Electric Power Automation Equipment , 2017 , 37 ( 8 ): 158 - 165 .