摘要
永磁直驱风电机构成的直驱恒频变速发电系统可通过全功率变流器与电网连接。当电网发生故障时,不仅会对发电机造成损坏,还会影响风力发电系统的安全运行。分析了系统故障期间机侧网侧功率不平衡的机理,基于发电机转子惯性储能及换流器无功补偿能力,提出了一种新型直驱风力发电系统的网侧故障穿越策略。在电网侧故障期间通过提高转子转速配合直流侧储能系统消耗机侧富余功率,以减低直流系统输出的不平衡功率,抑制故障期间直流侧电压攀高。应用仿真软件建立了单机系统的模型,仿真结果验证了控制策略的有效性。
引文
[1]董博,许晓艳,马烁,等.基于长过程动态仿真的风电接入对系统频率控制影响研究[J].电力系统保护与控制,2014,42(12).
[2]MOHSENI M,ISLAM S M.Review of international grid codes for wind power integration:diversity,technology and a case for global standard.Renewable and Sustainable Energy Reviews,2012,16(06).
[3]高峰,周孝信,朱宁辉,等.直驱式风电机组机电暂态建模及仿真[J].电网技术,2011,35(11).
[4]Ki-Hong Kim,Yoon-Cheul Jeung,Dong-Choon Lee.LVRT Scheme of PMSG Wind Power Systems Based on Feedback Linearization.IEEE TRANSACTIONS ON POWER ELECTRONICS,2012,5(27).
[5]姚骏,陈西寅,廖勇.电网电压不平衡时永磁直驱风电机组的控制策略[J].电力系统保护与控制,2011,14(39).
[6]侯桂欣,刘其辉,谢孟丽.对称及不对称电网故障下的电池储能系统低电压穿越控制策略[J].电力系统保护与控制,2013,10(41).
[7]候世英,房勇,曾建兴.应用超级电容提高风电系统低电压穿越能力[J].电机与控制学报,2010,14(05).
[8]Hansen A.D,Michalke G.Multi-pole permanent magnet synchronous generator wind turbines grid support capability in uninterrupted operation during grid faults.IET Renew.Power Gener,2009,3(03).
[9]Molinas M,Suul J.A,Undeland T.Low Voltage Ride Through of Wind Farms With Cage Generators:STATCOM Versus SVC.IEEE Trans.on Power Electronics,2008,23(03).
[10]Jun Li,Dujiang Li,Lei Hong.A Novel Power-flow Balance LVRT Control Strategy for Low-speed Direct-drive PMSG Wind Generation System.IEEE,2010(05).
[11]Li Yan,Chi Yongning.Study on LVRT Capability of D-PMSG Based Wind Turbine.IEEE,2011(18).
[12]张磊,梅柏杉.电网电压跌落对永磁同步电机风电系统的影响[J].华东电力,2010,38(1).
[13]党存禄,林国富.超导储能在并网直驱风电系统中的应用[J].电力系统保护与控制,2013,41(16).