新型双定子无刷双馈发电机包括内外功率绕组和内外控制绕组,二者分别通过中间带隔磁环的背靠背笼障转子进行磁场耦合。针对该新型双定子无刷双馈风力发电机提出一种直接功率控制方法,内外功率绕组及内外控制绕组分别串联以保持各自同相绕组的电磁一致性,将功率绕组有功和无功功率滞环比较器输出值及控制绕组磁链扇区号综合,采用查找表得到控制绕组机侧变流器所需输出的电压空间矢量。通过定量对比研究12/8极50 kW样机控制系统阶跃信号作用下的特性仿真与实验结果,验证了所提双定子无刷双馈风力发电机直接功率控制在亚同步~超同步速度变化范围内变速恒频发电、最大功率跟踪、无功功率与单位功率因数控制等方面的正确性、可行性和有效性。
Abstract
The novel dual-stator brushless doubly-fed generator （DS-BDFG） consists of inner and outer power windings and inner and outer control windings. The inner power and control windings are coupled by the inner magnetic field of inner cage-barrier rotor, the outer power and control windings are coupled by the outer magnetic field of outer cage-barrier rotor, and the inner and outer rotors are designed as back-to-back rotors where isolated with a non-magnetic ring. A novel direct power control （DPC） for the dual-stator brushless doubly-fed wind power generator is proposed. The inner and outer power windings also inner and outer control windings are connected in series, respectively, where the electromagnetic characteristics of the inner and outer power wingdings also inner and outer control windings can be kept consistent. By synthesizing the output values of the active and reactive power hysteresis comparator of power winding and the flux sector number of control windings, the voltage space vector of machine side converter can be determined by using the look-up table （LUT） method. The characteristic simulation and experimental results of the 12/8 pole 50 kW prototype control system under the action of step signal are studied by quantitative comparison. The correctness, feasibility and effectiveness of VSCF, MPPT, reactive power control and unit power factor control （UPFC） of the proposed LUT-DPC for the novel DS-BDFG in the range of speed variation from sub-synchronous to super-synchronous are verified.
关键词
无刷双馈发电机 /
双定子 /
背靠背笼障转子 /
直接功率控制 /
最大功率跟踪 /
单位功率因数控制
Key words
brushless double-fed generator /
dual-stator /
back-to-back cage-barrier rotor /
direct power control /
maximum power tracking /
unit power factor control
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基金
国家自然科学基金重点项目（51537007）; 辽宁省教育厅面上项目（LJKZ0617）
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