撬棒附加动态电容的双馈风电低电压穿越控制
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摘要
讨论双馈风力发电低电压穿越中,撬棒保护电路投入后双馈电机从电网吸收的无功功率大小与撬棒电阻的关系,提出了撬棒附加动态电容的双馈风力发电低电压穿越控制策略。根据双馈电机转速运行范围,选择3个不同滑差时计算出的电容为备用投切电容,按照转速要求选择IGBT管的闭合和开通状态,以产生该转速下最接近计算精确值的电容器组合。所提控制策略在10 kW双馈风力发电低电压穿越模拟平台上进行了实验验证。结果表明,该结构在减小低电压穿越时转子电流过冲的同时,有效促使电网故障电压快速恢复。
The relationship between the reactive power that DFIG(doubly-fed induction generator)absorbed from the grid and crowbar resistance when crowbar protect cut-in during the LVRT(low voltage ride through)was discussed,the control strategy of LVRT additional dynamic capacitance was put forward. According to the speed operating range of the DFIG,the capacitance calculated in three different slips was selected as a spare switching capacitor. The closed and open state of IGBT was selected according to the speed requirement,the purpose was to produce a capacitor combination that was close to the calculated value. The proposed control strategy was verified on a 10 kW LVRT of DFIG experimental platform,the results show that the structure can reduce the rotor current overshoot and effectively promote the fast recovery of grid voltage.
The relationship between the reactive power that DFIG(doubly-fed induction generator)absorbed from the grid and crowbar resistance when crowbar protect cut-in during the LVRT(low voltage ride through)was discussed,the control strategy of LVRT additional dynamic capacitance was put forward. According to the speed operating range of the DFIG,the capacitance calculated in three different slips was selected as a spare switching capacitor. The closed and open state of IGBT was selected according to the speed requirement,the purpose was to produce a capacitor combination that was close to the calculated value. The proposed control strategy was verified on a 10 kW LVRT of DFIG experimental platform,the results show that the structure can reduce the rotor current overshoot and effectively promote the fast recovery of grid voltage.
引文
[1] ZHANG Wenjuan,MA Haomiao,ZHANG Junli,et al. Multiobjective Fuzzy-optimization of Crowbar Resistances for the Low-voltage Ride-through of Doubly Fed Induction Wind Turbine Generation Systems[J]. Journal of Power Electronics,2015,15(4):1119-1129.
[2]熊威,邹旭东,黄清军,等.基于Crowbar保护的双馈感应发电机暂态特性与参数设计[J].电力系统自动化,2015,39(11):117-124.
[3]张文娟,马浩淼,张国慨,等.基于转子串联电阻的双馈风力发电机低电压穿越[J].电力自动化设备,2015,35(12):28-32.
[4] Mohammadi J,Afsharnia S,Vaez-Zadeh S. Efficient Faultride-through Control Strategy of DFIG-based Wind Turbines During the Grid Faults[J]. Energy Conversion and Management,2014,78(7):88-95.
[5] Niiranen J. Voltage Dip Ride Through of Doubly-fed Generator Equipped with Active Crowbar[C]//Nordic Wind Power Conference,2004:1501-1507.
[6]訾鹏,周孝信,安宁,等.提高双馈式风力发电机机电暂态模型crowbar保护仿真精度的方法[J].中国电机工程学报,2015,35(6):1322-1328.
[7] Snehaprava Swain,Pravat Kumar Ray. Short Circuit Fault Analysis in a Grid Connected DFIG Based Wind Energy System with Active Crowbar Protection Circuit for Ride Through Capability and Power Quality Improvement[J]. Electrical Power and Energy Systems,2017,48(5):64-75.
[8]张曼,姜惠兰.基于撬棒并联动态电阻的自适应双馈风力发电机低电压穿越[J].电工技术学报,2014,29(2):271-278.
[9]中国标准化管理委员会. GB/T 19963—2011风电场接入电力系统技术规定[S].北京:中国标准出版社,2012..
[10] Yang L,Xu Z,Ostergaard J,et al. Advanced Control Strategy of DFIG Wind Turbines for Power System Fault Ride Through[J]. IEEE Trans. on Power System,2012,27(2):713-722.
[11]董鹤楠.风力发电机组低电压穿越特性与动态无功补偿技术研究[D].沈阳:沈阳工业大学,2013.
[12] Yu Ling,Xu Cai,Wang Ningbo. Rotor Current Transient Analysis of DFIG-based Wind Turbines During Symmetrical Voltage Faults[J]. Energy Conversion and Management,2013,22(12):910-917.
[13]郑重,杨耕,耿华.电网故障下基于撬棒保护的双馈风电机组短路电流分析[J].电力自动化设备,2012,32(11):7-11.
[2]熊威,邹旭东,黄清军,等.基于Crowbar保护的双馈感应发电机暂态特性与参数设计[J].电力系统自动化,2015,39(11):117-124.
[3]张文娟,马浩淼,张国慨,等.基于转子串联电阻的双馈风力发电机低电压穿越[J].电力自动化设备,2015,35(12):28-32.
[4] Mohammadi J,Afsharnia S,Vaez-Zadeh S. Efficient Faultride-through Control Strategy of DFIG-based Wind Turbines During the Grid Faults[J]. Energy Conversion and Management,2014,78(7):88-95.
[5] Niiranen J. Voltage Dip Ride Through of Doubly-fed Generator Equipped with Active Crowbar[C]//Nordic Wind Power Conference,2004:1501-1507.
[6]訾鹏,周孝信,安宁,等.提高双馈式风力发电机机电暂态模型crowbar保护仿真精度的方法[J].中国电机工程学报,2015,35(6):1322-1328.
[7] Snehaprava Swain,Pravat Kumar Ray. Short Circuit Fault Analysis in a Grid Connected DFIG Based Wind Energy System with Active Crowbar Protection Circuit for Ride Through Capability and Power Quality Improvement[J]. Electrical Power and Energy Systems,2017,48(5):64-75.
[8]张曼,姜惠兰.基于撬棒并联动态电阻的自适应双馈风力发电机低电压穿越[J].电工技术学报,2014,29(2):271-278.
[9]中国标准化管理委员会. GB/T 19963—2011风电场接入电力系统技术规定[S].北京:中国标准出版社,2012..
[10] Yang L,Xu Z,Ostergaard J,et al. Advanced Control Strategy of DFIG Wind Turbines for Power System Fault Ride Through[J]. IEEE Trans. on Power System,2012,27(2):713-722.
[11]董鹤楠.风力发电机组低电压穿越特性与动态无功补偿技术研究[D].沈阳:沈阳工业大学,2013.
[12] Yu Ling,Xu Cai,Wang Ningbo. Rotor Current Transient Analysis of DFIG-based Wind Turbines During Symmetrical Voltage Faults[J]. Energy Conversion and Management,2013,22(12):910-917.
[13]郑重,杨耕,耿华.电网故障下基于撬棒保护的双馈风电机组短路电流分析[J].电力自动化设备,2012,32(11):7-11.