双馈感应风力发电机(doubly-fed induction generator,DFIG)在电网发生对称故障后,因其定子侧直接与电网相连,且转子电阻阻值通常较小,电网电压对称故障将导致DFIG转子电流快速抬升,严重影响风电机组的并网稳定性.对于当电网发生故障后变流器无法直接快速准确获取暂态量来补偿转子电压以达到抑制转子过电流的问题,提出了一种基于转子暂态电流的转子电压动态补偿方案,并分析了该补偿方案对定子暂态磁链衰减的影响.首先对DFIG进行故障电路分析,得到转子绕组等效电路以及转子电流在电网电压对称跌落时的动态过程,并基于转子侧变流器的电流内环调节得到在同步旋转坐标系下的转子电流表达式.然后通过坐标变换与转子绕组等效电路参数,得到转子暂态感应电动势,将其通过前馈控制补偿转子侧变流器的输出电压,以此削弱转子过电流.仿真结果表明,基于转子暂态电流的转子电压动态补偿方案对转子过电流抑制有良好效果,所提的控制方案提高了DFIG在故障状态下的并网能力.
Since the stator side of the doubly-fed induction generator(DFIG)is directly connected to the power grid and the rotor resistance value is usually small, the grid voltage symmetry fault leads to the rapid rise of DFIG rotor current, seriously affecting the grid-connected stability of wind turbines. Hence, this paper proposes a dynamic compensation scheme of rotor voltage based on the rotor transient current and analyzes the influence of the compensation scheme on the stator transient flux attenuation to address the problem that the converter cannot obtain the transient value directly and accurately compensate the rotor voltage for suppressing the rotor overcurrent when the power grid fails. The proposed method involves- DOI:10.3969/j.issn.1000-1565.2025.01.003基于转子暂态电流的双馈风电机组转子电压动态补偿控制白望望1,张中丹1,张耀忠1,赵伟阳1,付媛2(1.国网甘肃省电力公司经济技术研究院,甘肃 兰州 730050;2.华北电力大学 河北省分布式储能与微网省级重点实验室,河北 保定 071003)摘 要:双馈感应风力发电机(doubly-fed induction generator,DFIG)在电网发生对称故障后,因其定子侧直接与电网相连,且转子电阻阻值通常较小,电网电压对称故障将导致DFIG转子电流快速抬升,严重影响风电机组的并网稳定性.对于当电网发生故障后变流器无法直接快速准确获取暂态量来补偿转子电压以达到抑制转子过电流的问题,提出了一种基于转子暂态电流的转子电压动态补偿方案,并分析了该补偿方案对定子暂态磁链衰减的影响.首先对DFIG进行故障电路分析,得到转子绕组等效电路以及转子电流在电网电压对称跌落时的动态过程,并基于转子侧变流器的电流内环调节得到在同步旋转坐标系下的转子电流表达式.然后通过坐标变换与转子绕组等效电路参数,得到转子暂态感应电动势,将其通过前馈控制补偿转子侧变流器的输出电压,以此削弱转子过电流.仿真结果表明,基于转子暂态电流的转子电压动态补偿方案对转子过电流抑制有良好效果,所提的控制方案提高了DFIG在故障状态下的并网能力.关键词:双馈感应风力发电机;电网电压对称跌落;转子过电流;转子电压补偿;定子磁链衰减中图分类号:TM315 文献标志码:A 文章编号:1000-1565(2025)01-0020-14Dynamic compensation control of rotor voltage of doubly-fed wind turbine based on rotor transient currentBAI Wangwang1, ZHANG Zhongdan1, ZHANG Yaozhong1, ZHAO Weiyang1, FU Yuan21. Institute of Economic Technology, State Grid Gansu Electric Power Company, Lanzhou 730050, China; 2. Hebei Key Laboratory of Distributed Energy Storage and Micro-Grid, North China Electric Power University, Baoding 071003, China)Abstract: Since the stator side of the doubly-fed induction generator(DFIG)is directly connected to the power grid and the rotor resistance value is usually small, the grid voltage symmetry fault leads to the rapid rise of DFIG rotor current, seriously affecting the grid-connected stability of wind turbines. Hence, this paper proposes a dynamic compensation scheme of rotor voltage based on the rotor transient current and analyzes the influence of the compensation scheme on the stator transient flux attenuation to address the problem that the converter cannot obtain the transient value directly and accurately compensate the rotor voltage for suppressing the rotor overcurrent when the power grid fails. The proposed method involves- 收稿日期:2024-05-31;修回日期:2024-11-11 基金项目:国网甘肃省电力科技项目(522730230006) 第一作者:白望望(1991—),男,国网甘肃省电力公司经济技术研究院工程师,主要从事输电网规划技术及新能源消纳方向研究.E-mail:1241509352@qq.com 通信作者:付媛(1982—),女,华北电力大学副教授,博士,主要从事新能源发电控制技术方面的研究.E-mail:1172766364@qq.com 第1期白望望等:基于转子暂态电流的双馈风电机组转子电压动态补偿控制河北大学学报(自然科学版) 第45卷analyzing the fault circuit of the DFIG to derive the equivalent circuit of rotor winding and study the dynamic process of rotor current when the grid voltage drops symmetrically. Subsequently, the rotor overcurrent expression in the synchronous rotating coordinate system is obtained based on the current inner loop adjustment of the rotor side converter. Then, the rotor transient electromotive force(EMF)is obtained using coordinate transformation and equivalent circuit parameters of the rotor winding. This EMF is used by feedforward control to compensate the output voltage of the rotor-side converter, aiming to weaken the rotor overcurrent. Simulation results demonstrate that the dynamic compensation scheme based on transient rotor current for rotor voltage effectively suppresses rotor overcurrent, and the proposed control scheme enhances the grid connection capability of DFIG during power grid fault conditions.
[1] 庞彬,周紫烨,齐晓帆,等.双馈异步风力发电机转子匝间短路故障振动特性分析[J].河北大学学报(自然科学版), 2024, 44(1): 9-16. DOI: 10.3969/j.issn.1000-1565.2024.01.002.
[2] LOPEZ J, SANCHIS P, ROBOAM X, et al.Dynamic behavior of the doubly fed induction generator during three-phase voltage dips[J]. IEEE Trans Energy Convers, 2007, 22(3): 709-717. DOI: 10.1109/TEC.2006.878241.
[3] CHENG P, NIAN H, WU C, et al. Direct stator current vector control strategy of DFIG without phase-locked loop during network unbalance[J]. IEEE Trans Power Electron, 2017, 32(1): 284-297. DOI: 10.1109/TPEL.2016.2533638.
[4] 年珩,程鹏,贺益康.故障电网下双馈风电系统运行技术研究综述[J].中国电机工程学报, 2015, 35(16): 4184-4197. DOI: 10.13334/j.0258-8013.pcsee.2015.16.022.
[5] 王伟,孙明冬,朱晓东.双馈式风力发电机低电压穿越技术分析[J].电力系统自动化, 2007, 31(23): 84-89. DOI: 10.3321/j.issn: 1000-1026.2007.23.019.
[6] 何聚彬,赵博超,于维耀,等.双馈电机变速调相系统低电压穿越过程的转子稳定性控制研究[J].可再生能源, 2024, 42(7): 979-985. DOI: 10.13941/j.cnki.21-1469/tk.2024.07.013.
[7] 刘刚,袁至,王维庆,等.基于混合储能的双馈风机的电网支撑能力提升策略[J].可再生能源, 2022, 40(10): 1387-1395. DOI: 10.13941/j.cnki.21-1469/tk.2022.10.014.
[8] 罗嘉,赵浩然,高术宁,等.基于显式模型预测控制和改进虚拟阻抗的双馈风机低电压穿越策略[J].电网技术, 2021, 45(5): 1716-1723. DOI: 10.13335/j.1000-3673.pst.2020.2085.
[9] 郑涛,邹芃蓥,颜景娴,等.适用于高比例风电接入的自适应低电压故障穿越控制策略[J].电网技术, 2022, 46(12): 4666-4677. DOI: 10.13335/j.1000-3673.pst.2022.1074.
[10] ZHU J H, ZHANG P K, ZHANG X S, et al. Model predictive control on transient flux linkage and reactive power compensation of doubly fed induction wind generator[J]. Int J Energy Res, 2024, 2024: 6648691. DOI: 10.1155/2024/6648691.
[11] JABBOUR N, TSIOUMAS E, MADEMLIS C, et al. A highly effective fault-ride-through strategy for a wind energy conversion system with a doubly fed induction generator[J]. IEEE Trans Power Electron, 2020, 35(8): 8154-8164. DOI: 10.1109/TPEL.2020.2967971.
[12] RAFIEE Z, HEYDARI R, RAFIEE M, et al. Enhancement of the LVRT capability for DFIG-based wind farms based on short-circuit capacity[J]. IEEE Syst J, 2022, 16(2): 3237-3248. DOI: 10.1109/JSYST.2022.3153887.
[13] 徐殿国,王伟,陈宁.基于撬棒保护的双馈电机风电场低电压穿越动态特性分析[J].中国电机工程学报, 2010, 30(22): 29-36. DOI: 10.13334/j.0258-8013.pcsee.2010.22.003.
[14] GHOLIZADEH M, TOHIDI S, ORAEE A, et al. Appropriate crowbar protection for improvement of brushless DFIG LVRT during asymmetrical voltage dips[J]. Int J Electr Power Energy Syst, 2018, 95: 1-10. DOI: 10.1016/j.ijepes.2017.07.018.
[15] GAO F, XUE A C, SU S, et al. Research on the improvement of LVRT ability of an actual DFIG-type wind farm with Crowbar and SVG[J]. Int Conf Renew Power Gener RPG 2015, 2015: 1-5. DOI: 10.1049/cp.2015.0452.
[16] 姚骏,廖勇,李辉.采用串联网侧变换器的DFIG风电系统低电压穿越控制[J].电力系统自动化, 2010, 34(6): 98-103, 115.
[17] YAO J, LI H, CHEN Z, et al. Enhanced control of a DFIG-based wind-power generation system with series grid-side converter under unbalanced grid voltage conditions[J]. IEEE Trans Power Electron, 2013, 28(7): 3167-3181. DOI: 10.1109/TPEL.2012.2219884.
[18] 李梅,李建林,赵斌,等.不同电网故障情况下DFIG运行特性比较[J].高电压技术, 2008, 34(4): 777-782. DOI: 10.13336/j.1003-6520.hve.2008.04.030.
[19] ANANTH DUGGIRALA V N, NAGESH KUMAR GUNDAVARAPU V. Improved LVRT for grid connected DFIG using enhanced field oriented control technique with super capacitor as external energy storage system[J]. Eng Sci Technol Int J, 2016, 19(4): 1742-1752. DOI: 10.1016/j.jestch.2016.07.014.
[20] HUY T N, LE HANH D, TAKANO H, et al. Cooperative LVRT control for protecting PMSG-based WTGs using battery energy storage system[J]. Energy Reports, 2023, 9: 590-598. DOI: 10.1109/TEC.2015.2449900
[21] 凌禹.对称电压故障下双馈风力发电机瞬态特性分析[J].中国电机工程学报, 2022, 42(18): 6871-6879. DOI: 10.13334/j.0258-8013.pcsee.211452.
[22] LIU M Y, PAN W X, RAO Y F, et al. An electromagnetic transient analysis model for DFIG considering LVRT hardware protection[J]. IEEE Access, 2021, 9: 32591-32598. DOI: 10.1109/ACCESS.2021.3060409.
[23] 杨淑英,陈银,周天保,等.低电压穿越过程中双馈风电机组虚拟电感暂态自灭磁控制[J].电力系统自动化, 2015, 39(4): 12-18. DOI: 10.7500/AEPS20140702009.
[24] 周临原,刘进军,周思展.对称电网故障下双馈式风力发电系统去磁控制[J].电网技术, 2014, 38(12): 3424-3430. DOI: 10.13335/j.1000-3673.pst.2014.12.024.
[25] 张禄,金新民,战亮宇,等.电网电压对称跌落下的双馈感应风力发电机磁链有源衰减控制[J].电工技术学报, 2012, 27(9): 191-197. DOI: 10.19595/j.cnki.1000-6753.tces.2012.09.026.
[26] WANG S, HU J B, YUAN X M. Virtual synchronous control for grid-connected DFIG-based wind turbines[J]. IEEE J Emerg Sel Top Power Electron, 2015, 3(4): 932-944. DOI: 10.1109/JESTPE.2015.2418200.
[27] WANG S, HU J B, YUAN X M, et al. On inertial dynamics of virtual-synchronous-controlled DFIG-based wind turbines[J]. IEEE Trans Energy Convers, 2015, 30(4): 1691-1702. DOI: 10.1109/TEC.2015.2460262.
[28] 迟永宁,王伟胜,戴慧珠.改善基于双馈感应发电机的并网风电场暂态电压稳定性研究[J].中国电机工程学报, 2007, 27(25): 25-31. DOI: 10.3321/j.issn: 0258-8013.2007.25.005.
[29] ALI M A S, MEHMOOD K K, BALOCH S, et al. Modified rotor-side converter control design for improving the LVRT capability of a DFIG-based WECS[J]. Electr Power Syst Res, 2020, 186: 106403. DOI: 10.1016/j.epsr.2020.106403.
[30] 年珩,程鹏,诸自强.电网电压对称故障时DFIG转子电流的优化控制策略[J].电工技术学报, 2014, 29(7): 200-208. DOI: 10.19595/j.cnki.1000-6753.tces.2014.07.026.
[31] 朱晓荣,刘世鹏,王毅.电网电压对称故障时双馈风电机组转子电压补偿控制策略[J].高电压技术, 2016, 42(10): 3280-3288.DOI: 10.13336/j.1003-6520.hve.20160926032.
[32] 姜惠兰,王绍辉,贾燕琪,等.基于定子电流微分前馈控制的双馈异步风力发电机低电压穿越复合控制策略[J].高电压技术, 2021, 47(1): 198-204. DOI: 10.13336/j.1003-6520.hve.20200402002. (
