动态电压恢复器提升PMSG-FFRT运行能力研究
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摘要
提出超级电容(SC)储能的动态电压恢复器(DVR)提升永磁同步电机(PMSG)风电系统柔性故障穿越(FFRT)能力策略.对PMSG的数学模型,DVR的工作原理、矢量关系及其比例谐振(PR)控制进行了研究.在此基础上,建立了基于SC储能的三单相DVR提升PMSG风电系统故障穿越能力仿真模型,电网故障时DVR进行分相畸变电压补偿,维持PMSG输出端电压恒定,提升了FFRT能力.针对电网对称和不对称短路故障情况,DVR均可向电网串联注入补偿电压,改善了PMSG输出端电压特性.研究结果表明,不论在对称或不对称短路电网故障工况,DVR均改善了PMSG机组FFRT运行能力,可向电网注入友好型清洁风能.
The dynamic voltage restorer(DVR)based on super capacitor(SC)energy storage was proposed to enhance the flexible fault ride through(FFRT)capability of permanent magnet synchronous generator(PMSG)wind power systems.The mathematical model of PMSG,operating principle of DVR,vector relations and proportional resonance(PR)control were studied.Based on this,the simulation model of three single-phase DVRs based on SC energy storage were established to enhance the fault ride through capability of PMSG wind power systems.When the power grid fails,the DVR compensates each phase distortion voltage,maintains the PMSG voltage constant,and improves the FFRT capability.For symmetric and asymmetrical short circuit faults in the power grid,the DVR can inject compensation voltage into the grid in series,improving the output voltage characteristics of the PMSG.The results of the study indicate that,regardless of whether it is in a symmetrical or asymmetrical short circuit condition,the proposed DVR improves the PMSG FFRT operation capability and can inject friendly clean wind energy into the grid.
The dynamic voltage restorer(DVR)based on super capacitor(SC)energy storage was proposed to enhance the flexible fault ride through(FFRT)capability of permanent magnet synchronous generator(PMSG)wind power systems.The mathematical model of PMSG,operating principle of DVR,vector relations and proportional resonance(PR)control were studied.Based on this,the simulation model of three single-phase DVRs based on SC energy storage were established to enhance the fault ride through capability of PMSG wind power systems.When the power grid fails,the DVR compensates each phase distortion voltage,maintains the PMSG voltage constant,and improves the FFRT capability.For symmetric and asymmetrical short circuit faults in the power grid,the DVR can inject compensation voltage into the grid in series,improving the output voltage characteristics of the PMSG.The results of the study indicate that,regardless of whether it is in a symmetrical or asymmetrical short circuit condition,the proposed DVR improves the PMSG FFRT operation capability and can inject friendly clean wind energy into the grid.
引文
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[2] Du W,Chen X,Wang H.PLL-induced modal resonance of grid-connected PMSGs with the power system electromechanical oscillation modes[J].IEEE Transactions on Sustainable Energy,2017,8(4):1581~1591.
[3] Yuan X,Li Y.Control of variable pitch and variable speed direct-drive wind turbines in weak grid systems with active power balance[J].IET Renewable Power Generation,2014,8(2):119~131.
[4]任永峰,胡宏彬,薛宇,等.基于卸荷电路和无功优先控制的永磁同步风力发电机组低电压穿越研究[J].高电压技术,2016,42(1):11~18.
[5]贺益康,徐海亮.双馈风电机组电网适应性问题及其谐振控制解决方案[J].中国电机工程学报,2014,34(29):5188~5203.
[6]贾锋,蔡旭,李征,等.风电机组精细化建模及硬件在环实时联合仿真[J].中国电机工程学报,2017,37(4):1239~1250.
[7] Yao J,Guo L,Zhou Te,et al.Capacity configuration and coordinated operation of a hybrid wind farm with FSIG-based and PMSG-based wind farms during grid faults[J].IEEE Transactions on Energy Conversion,2017,32(3):1188~1198.
[8]孟永庆,王健,李磊,等.考虑风机转速限制及卸荷电路优化的永磁同步电机新型低电压穿越协调控制策略[J].中国电机工程学报,2015,35(24):6283~6292.
[9]李生虎,许志峰.直驱永磁同步机组卸荷电阻最优取值及分组投切策略[J].电网技术,2013,37(7):1868~1873.
[10]袁小明,程时杰,文劲宇.储能技术在解决大规模风电并网问题中的应用前景分析[J].电力系统自动化,2013,37(1):14~18.
[11] Wessels C,Gebhardt F,Fuchs F.Fault ride-through of a DFIG wind turbine using a dynamic voltage restorer during symmetrical and asymmetrical grid faults[J].IEEE Transactions on Power electronics,2011,26(3):807~815.
[12]许建兵,江全元,石庆均.基于储能型DVR的双馈风电机组电压穿越协调控制[J].电力系统自动化,2013,37(4):14~20.
[13]任永峰,孙伟,韩俊飞,等.采用全钒液流电池储能的UDVR提升DFIG-LVRT能力研究[J].高电压技术,2015,41(10):3185~3192.
[14] Chen L,Chen H,Yang J,et al.Comparison of superconducting fault current limiter and dynamic voltage restorer for LVRT improvement of high penetration microgrid[J].IEEE Transactions on Applied Superconductivity,27(4):1~7.
[15] Wang L,Vo Q S,Prokhorov A V.Stability improvement of a multimachine power system connected with a largescale hybrid wind-photovoltaic farm using a supercapacitor[J].IEEE Transactions on Industry Applications,2018,54(1):50~60.
[16] Yuan Y,Sun C,Li M.Determination of optimal supercapacitor-lead-acid battery energy storage capacity for smoothing wind power using empirical mode decomposition and neural network[J].Electric Power Systems Research,2015,127:323~331.
[17]张琛,李征,蔡旭,等.超级电容提升双馈风电机组异常电压耐受能力[J].太阳能学报,2016,37(11):2792~2799.