经柔性直流输电并网的大型风电场频率控制策略
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摘要
在大型风电场经柔性直流输电系统并入交流电网的场合,传统的电网调频方法难以适用。提出一种频率控制策略,分别在逆变侧换流器、整流侧换流器和风电机组上设计响应频率变化的控制环节。所有控制环节均基于本地测量的信号,无需远距离通信。该方法可以使风电场参与交流系统调频,此外,当系统故障引起柔性直流送出容量受限时,该方法可以自动降低风电机组功率,防止直流侧过压保护动作。
Traditional frequency control approaches are generally not applicable for large-scale wind farms integrated to AC gird through VSC-HVDC(Voltage Source Converter based HVDC). In this regard,a frequency control approach is proposed. Supplementary controllers corresponding to frequency variation in receiving end,sending end and wind farm are designed based on local measurements to reduce reliance on communication. Wind farms can participate in the frequency regulation of AC grid using this approach. In addition,during the case that fault conditions result in limited transmission capacity of VSC-HVDC,wind farms can decrease their power outputs to avoid over-vol-tage in the DC side of VSC-HVDC.
Traditional frequency control approaches are generally not applicable for large-scale wind farms integrated to AC gird through VSC-HVDC(Voltage Source Converter based HVDC). In this regard,a frequency control approach is proposed. Supplementary controllers corresponding to frequency variation in receiving end,sending end and wind farm are designed based on local measurements to reduce reliance on communication. Wind farms can participate in the frequency regulation of AC grid using this approach. In addition,during the case that fault conditions result in limited transmission capacity of VSC-HVDC,wind farms can decrease their power outputs to avoid over-vol-tage in the DC side of VSC-HVDC.
引文
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[17] PHULPIN Y.Communication-free inertia and frequency control for wind generators connected by an HVDC-link[J].IEEE Transac-tions on Power Systems,2012,27(2):1136-1137.
[18] SILVA B,MOREIRA C L,SECA L,et al.Provision of inertial and primary frequency control services using offshore multi-terminal HVDC networks[J].IEEE Transactions on Sustainable Energy,2012,3(4):800-808.
[19] ADEUYI O D,CHEAH-MANE M,LIANG J,et al.Fast frequency response from offshore multiterminal VSC-HVDC schemes[J].IEEE Transactions on Power Delivery,2017,32(6):2442-2452.
[20] 王国强,王志新,张学燕.海上风电场柔性直流输电变流器的无源性控制策略[J].电力自动化设备,2011,31(8):11-15.WANG Guoqiang,WANG Zhixin,ZHANG Xueyan.Passivity control of VSC-HVDC for offshore wind farm[J].Electric Power Automation Equipment,2011,31(8):11-15.
[2] 董云龙,凌卫家,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):169-175.DONG Yunlong,LING Weijia,TIAN Jie,et al.Control & protection system for Zhoushan multi-terminal VSC-HVDC[J].Electric Power Automation Equipment,2016,36(7):169-175.
[3] 王曦,李兴源,魏巍,等.柔性直流和常规直流互联输电系统协调控制策略[J].电力自动化设备,2016,36(12):102-108.WANG Xi,LI Xingyuan,WEI Wei,et al.Coordinated control stra-tegy for interconnected transmission system of VSC-HVDC and LCC-HVDC[J].Electric Power Automation Equipment,2016,36(12):102-108.
[4] 彭茂兰.异步联网工程柔性直流测量异常导致功率反转机理分析和优化策略研究[J].电力自动化设备,2018,38(8):218-223.PENG Maolan.Mechanism analysis and optimization strategy of active power reversal caused by abnormal measurement of flexible HVDC in asynchronous interconnection project[J].Electric Power Automation Equipment,2018,38(8):218-223.
[5] ANDREASSON M,WIGET R,DIMAROGONAS D V,et al.Distri-buted frequency control through MTDC transmission systems[J].IEEE Transactions on Power Systems,2017,32(1):250-260.
[6] CHAUDHURI N R,CHAUDHURI B.Adaptive droop control for effective power sharing in Multi-Terminal DC(MTDC) grids[J].IEEE Transactions on Power Systems,2013,28(1):21-29.
[7] CHAUDHURI N R,MAJUMDER R,CHAUDHURI B.System frequency support through Multi-Terminal DC(MTDC) grids[J].IEEE Transactions on Power Systems,2013,28(1):347-356.
[8] ZHANG L,HARNEFORS L,NEE H P.Interconnection of two very weak AC systems by VSC-HVDC links using power-synchronization control[J].IEEE Transactions on Power Systems,2011,26(1):344-355.
[9] GUAN M,CHENG J,WANG C,et al.The frequency regulation sche-me of interconnected grids with VSC-HVDC links[J].IEEE Tran-sactions on Power Systems,2017,32(2):864-872.
[10] 刘巨,姚伟,文劲宇,等.大规模风电参与系统频率调整的技术展望[J].电网技术,2014,38(3):638-646.LIU Ju,YAO Wei,WEN Jinyu,et al.Prospect of technology for large-scale wind farm participating into power grid frequency regulation[J].Power System Technology,2014,38(3):638-646.
[11] 周密,徐箭,孙元章.多端柔性直流电网平抑风电波动的协调控制策略[J].电力自动化设备,2016,36(12):29-35.ZHOU Mi,XU Jian,SUN Yuanzhang.Coordinated control restraining wind power fluctuation of VSC-MTDC[J].Electric Power Automation Equipment,2016,36(12):29-35.
[12] VIDYANANDAN K V,NILANJAN S.Primary frequency regulation by deloaded wind turbines using variable droop[J].IEEE Transactions on Power Systems,2013,28(2):837-846.
[13] 胡旭,边晓燕,周歧斌,等.基于VSC-HVDC并网风电场的系统调频综合控制[J].现代电力,2017,34(6):53-58.HU Xu,BIAN Xiaoyan,ZHOU Qibin,et al.An integrated frequency control for grid-connected wind farm based on VSC-HVDC[J].Modern Electric Power,2017,34(6):53-58.
[14] LI C,ZHAN P,WEN J,et al.Offshore wind farm integration and frequency support control utilizing hybrid multi-terminal HVDC transmission[J].IEEE Transactions on Industry Applications,2014,50(4):2788-2797.
[15] LIU H,CHEN Z.Contribution of VSC-HVDC to frequency regulation of power systems with offshore wind generation[J].IEEE Transactions on Energy Conversion,2015,30(3):918-926.
[16] LI Y,XU Z,?STERGAARD J,et al.Coordinated control strategies for offshore wind farm integration via VSC-HVDC for system frequency support[J].IEEE Transactions on Energy Conversion,2017,32(3):843-856.
[17] PHULPIN Y.Communication-free inertia and frequency control for wind generators connected by an HVDC-link[J].IEEE Transac-tions on Power Systems,2012,27(2):1136-1137.
[18] SILVA B,MOREIRA C L,SECA L,et al.Provision of inertial and primary frequency control services using offshore multi-terminal HVDC networks[J].IEEE Transactions on Sustainable Energy,2012,3(4):800-808.
[19] ADEUYI O D,CHEAH-MANE M,LIANG J,et al.Fast frequency response from offshore multiterminal VSC-HVDC schemes[J].IEEE Transactions on Power Delivery,2017,32(6):2442-2452.
[20] 王国强,王志新,张学燕.海上风电场柔性直流输电变流器的无源性控制策略[J].电力自动化设备,2011,31(8):11-15.WANG Guoqiang,WANG Zhixin,ZHANG Xueyan.Passivity control of VSC-HVDC for offshore wind farm[J].Electric Power Automation Equipment,2011,31(8):11-15.