一种直流配电网交流侧不平衡情况下的电压脉动抑制策略
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摘要
在直流配电网中,交流侧电压三相不平衡会引起直流电压的二倍频脉动,进而影响直流配电网各端的稳定运行。为抑制直流电压的脉动分量,在分析直流电压脉动产生原理的基础上,提出了一种蓄电池侧基于准PR控制的电压脉动抑制策略。该策略基于准PR控制实现直流电压二次脉动分量的跟踪,在此基础上,通过蓄电池对直流配电网的脉动功率进行补偿,以达到抑制直流电压脉动分量的目的,且不会进一步恶化交流侧的运行状态。最后通过MATLAB/SIMULINK搭建了直流配电网仿真平台,验证了所提直流电压脉动抑制策略的有效性,分析了参数变化对控制效果的影响。
In DC distribution network, the three-phase imbalance of AC side voltage will cause double power frequency fluctuation of DC voltage, which will affect the stable operation of each end of DC distribution network. In order to suppress the DC voltage ripple component, a quasi-PR control strategy for voltage ripple suppression on battery side was proposed based on the analysis of the principle of DC voltage ripple generation. The strategy is based on quasi-PR control to track the secondary DC voltage ripple component. On this basis, the unbalanced power of DC distribution network is compensated by batteries, so as to suppress the DC voltage ripple component without further deteriorating the operation state of AC side. Finally, a DC distribution network simulation platform is built by using MATLAB/SIMULINK to verify the effectiveness of the proposed voltage ripple suppression strategy, and the influence of parameter changes on the control effect is analyzed.
In DC distribution network, the three-phase imbalance of AC side voltage will cause double power frequency fluctuation of DC voltage, which will affect the stable operation of each end of DC distribution network. In order to suppress the DC voltage ripple component, a quasi-PR control strategy for voltage ripple suppression on battery side was proposed based on the analysis of the principle of DC voltage ripple generation. The strategy is based on quasi-PR control to track the secondary DC voltage ripple component. On this basis, the unbalanced power of DC distribution network is compensated by batteries, so as to suppress the DC voltage ripple component without further deteriorating the operation state of AC side. Finally, a DC distribution network simulation platform is built by using MATLAB/SIMULINK to verify the effectiveness of the proposed voltage ripple suppression strategy, and the influence of parameter changes on the control effect is analyzed.
引文
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[2]李斌,刘海金,孔祥平,等.直流配电网运行控制策略分析及展望[J].电力建设,2018,39(11):96-108.
[3]孙鹏飞,贺春光,邵华,等.直流配电网研究现状与发展[J].电力自动化设备,2016,36(6):64-73.
[4]周逢权,黄伟.直流配电网系统关键技术探讨[J].电力系统保护与控制,2014,42(22):62-67.
[5]曾嘉思,徐习东,赵宇明.交直流配电网可靠性对比[J].电网技术,2014,38(9):2582-2589.
[6]郑欢,江道灼,杜翼.交流配电网与直流配电网的经济性比较[J].电网技术,2013,37(12):3368-3374.
[7]熊雄,季宇,李蕊,等.直流配用电系统关键技术及应用示范综述[J].中国电机工程学报,2018,38(23):6802-6813.
[8]景世良,王毅,许士锦,等.基于VSC的直流配电网的电压调整控制策略[J].电力科学与工程,2016,32(5):7-13.
[9]XU C D,CHENG K W E.A survey of distributed power system-AC versus DC distributed power system[C]//International Conference on Power Electronics Systems and Applications IEEE,Hong Kong,China,2011:1-12.
[10]SITHIMOLADA V,SAUER P W.Facility-level DC vs typical ac distribution for data centers:A comparative reliability study[C]//Tencon IEEE Region 10 Conference,Fukuoka,Japan,2011:2102-2107.
[11]王成山,李微,王议锋,等.直流微电网母线电压波动分类及抑制方法综述[J].中国电机工程学报,2017,37(1):84-98.
[12]阳同光,桂卫华.电网不平衡情况下并网逆变器控制策略综述[J].电工技术学报,2015,30(14):241-246.
[13]韦徵,茹心芹,石伟,等.适用于不平衡负载工况下的微网逆变器控制策略[J].电力系统自动化,2016,40(20):76-82.
[14]石存玮.逆变器的三相不平衡负载控制方法研究[D].成都:西南交通大学,2014.
[15]SUH Y,TIJERAS V,LIPO T A.A nonlinear control of the instantaneous power in DQ synchronous frame for PWM AC/DC converter under generalized unbalanced operating conditions[C]//Industy Applications Conference,2002.37th IAS Annual Meeting.Conference Record of the IEEE,2002.
[16]YIN B,ORUGANTI R,PANDA S K,et al.An output-power-control strategy for a three-phase PWM rectifier under unbalanced supply conditions[J].IEEE Transactions on Industrial Electronics,2008,55(5):2140-2151.
[17]YUAN X,MERK W,STEMMLER H,et al.Stationary-frame generalized integrators for current control of active power filters with zero steady-state error for current harmonics of concern under unbalanced and distorted operating conditions[J].IEEE Transactions on Industry Applications,2002,38(2):523-532.
[18]HU JB,HE YK.Modeling and control of grid-connected voltage-sourced converters under generalized unbalanced operation conditions[J].IEEE Transactions on Energy Conversion,2008,23(3):903-913.
[19]章玮,王宏胜,任远,等.不对称电网电压条件下三相并网型逆变器的控制[J].电工技术学报,2010,25(12):103-110.
[20]SUH Y,LIPO T A.Control scheme in hybrid synchronous stationary frame for PWM AC/DC converter under generalized unbalanced operating conditions[J].IEEE Transactions on Industry Applications,2006,42(3):825-835.
[21] 胡家兵,贺益康,王宏胜.不平衡电网电压下双馈感应发电机转子侧变换器的比例-谐振电流控制策略[J].中国电机工程学报,2010,30(6) :48-56.
[22]ETXEBERRIA-OTADUI I,VISCARRET U,CABALLERO M,et al.New optimized PWM VSC control structures and strategies under unbalanced voltage transients[J].IEEE Transactions on Industrial Electronics,2007,54(5):2902-2914.
[23]HU J B,HE Y K,XU L,et al.Improved control of DFIG systems during network unbalance using PI-R current regulators[J].IEEE Transactions on Industrial Electronics,2009,56(2):439-451.