基于直接功率控制的开绕组BDFG系统共模电压抑制
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摘要
无刷双馈发电机(brushless doubly-fed generator,BDFG)的定子上具有两套极数不同的绕组,分别为功率绕组和控制绕组。开绕组无刷双馈发电机(open winding brushless doubly-fed generator,OW-BDFG)是将控制绕组全部打开,两端各接一个变频器对OW-BDFG进行控制。当两个变频器之间采用共直流母线结构时,会在系统中形成零序电流的回路,在共模电压的作用下会产生零序电流,影响发电机的效率和性能。针对OW-BDFG的特殊结构,基于直接功率控制(direct power control,DPC)策略,提出了一种能够消除共模电压的电压调制方法,既实现了对有功功率和无功功率的解耦控制,又解决了共直流母线OW-BDFG系统中存在零序电流的问题。最后,通过仿真和实验研究与对比分析,验证了所提出的基于直接功率控制的开绕组BDFG系统共模电压抑制(direct power control-common-mode voltage elimination,DPC-CMVE)方法的可行性和优越性。
Brushless doubly-fed generator( BDFG) has two sets of different number windings on the stator,the power winding and control winding,and adopts the hybrid rotor structure consisting of magnetic barrier and cage. Open winding brushless doubly-fed generator( OW-BDFG) opens the control winding entirely and connects a converter to each end. When the two converters use a common DC-bus,the system forms a zero sequence current loop and produces the zero sequence current which affects the efficiency and performance of the system under the action of common-mode voltage. A voltage modulation method was proposed to eliminate common-mode voltage based on direct power control( DPC) for the special structure,both to achieve the decoupling control of active power and reactive power,and to solve the zero sequence current problems existing in the common DC-bus OW-BDFG system. Finally,the effectiveness and superiority of proposed common-mode voltage elimination for open winding brushless doubly-fed gen-erator based on direct power control( CMVE-DPC) method is verified through the simulation and experiment research and comparison analysis.
Brushless doubly-fed generator( BDFG) has two sets of different number windings on the stator,the power winding and control winding,and adopts the hybrid rotor structure consisting of magnetic barrier and cage. Open winding brushless doubly-fed generator( OW-BDFG) opens the control winding entirely and connects a converter to each end. When the two converters use a common DC-bus,the system forms a zero sequence current loop and produces the zero sequence current which affects the efficiency and performance of the system under the action of common-mode voltage. A voltage modulation method was proposed to eliminate common-mode voltage based on direct power control( DPC) for the special structure,both to achieve the decoupling control of active power and reactive power,and to solve the zero sequence current problems existing in the common DC-bus OW-BDFG system. Finally,the effectiveness and superiority of proposed common-mode voltage elimination for open winding brushless doubly-fed gen-erator based on direct power control( CMVE-DPC) method is verified through the simulation and experiment research and comparison analysis.
引文
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[3]魏超.浅谈风力发电技术发展现状及趋势[J].科技创新与应用,012,23:156.WEI Chao.Talking about the present situation and trend of wind power generation technology[J].Science and Technology Innovation and Application,2012,23:156.
[4]刁统山,王秀和.永磁感应电机直接功率控制[J].电机与控制学报,2013,17(4):12.DIAO Tongshan,WANG Xiuhe.Permanent power induction motor direct power control[J].Electric Machines and Control,2013,17(4):12.
[5]马宏伟,许烈,李永东.基于直接虚功率控制的双馈风电系统并网方法[J].中国电机工程学报,2013,33(3):99.MA Hongwei,XU Lie,LI Yongdong.Method of grid-connected wind power system based on direct virtual power control[J].Proceedings of the CSEE,2013,33(3):99.
[6]PANKRATOV V V,KOTIN D A,VDOVIN V V,A doubly fed induction motor drive of a mine hoisting plant[J].Russian Electrical Engineering,2014,85(12):709.
[7]KALAISELVI J,SEKHAR K R C,SRINIVAS S.Common mode voltage elimination PWMs for a dual two-level VSI with single inverter switching[C]//IEEE International Symposium on Industrial Electronics,Hangzhou,2012:234.
[8]SEKHAR K R,SRINIVAS S.Current ripple analysis for an asymmetric dual two-level inverter drive with reduced common mode voltage pwm technique[C]//IEEE International Conference on Power Electronics,Bengaluru,2012:1.
[9]SRINIVAS S,SOMASEKHAR V T.Switching algorithms for the dual inverter fed open-end winding induction motor drive for 3-level voltage space phasor generation[J].Asian Power Electronics Journal,2007,1(1):96.
[10]WANG Y,PANDA D,LIPO T,et al.Open-winding power conversion systems fed by half-controlled converters[J].IEEE Transactions on Power Electronics,2013,28(5):2427.
[11]KALAISELVI J,SEKHAR K R C,SRINIVAS S.Common mode voltage elimination PWMs for a dual two-level VSI with single inverter switching[C]//IEEE International Symposium on Industrial Electronics,Hangzhou,2012:234.
[12]SEKHAR K R,SRINIVAS S.Current ripple analysis for an asymmetric dual two-level inverter drive with reduced common mode voltage pwm technique[C]//IEEE International Conference on Power Electronics,Bengaluru,2012:1.
[13]SOMASEKHAR V T,SRINIVAS S,K KRANTI KUMAR.Effect of zero-vector placement in a dual-inverter fed open-end winding induction motor drive with alternate sub-hexagonal centre PWM switching scheme[J].IEEE Transactions on Power Electronics,Vol.23,No.3,May,2008:1584.