基于dSPACE的电网谐波环境下双馈风机的适应性分析

Adaptation analysis of doubly-fed induction generator with grid harmonicsbased on dSPACE

文章以双馈电机(DFIG)机组及以含有5,7,11,13次谐波电压的电网为研究对象,针对风电机组应对电网谐波带来的扰动并维持正常运行等问题进行了研究。给出了一种基于多重谐振控制器的谐波抑制方法,并在dSPACE仿真平台上建立了一台2 MW风机模型,借助dSPACE系统提供的ControlDesk环境对其进行实时仿真分析。实时仿真结果表明,该方案能有效减少5,7,11,13次电网谐波电压带来的影响,使DFIG定子电流波形更加正弦化,改善直流母线电压波动问题,提高了电网谐波环境下风机系统的适应性。

With the development of wind power generation,doubly-fed induction generator（DFIG）comes into our eyes.There are some problems in the using of the DFIG,one of the problems is harmonics come from grid whichinfluence the security of the DFIG badly. In order tosuppress the harmonics,this paper focuses on DFIG and distortion of 5th,7th,11 th,13th harmonics in grid.The mathematical analysis of DFIG and conventional control strategy for converter is presented so as tounderstand the DFIG system deeply and comprehensively. Harmonics influence on DFIG is analyzed and a specialcurrent controller based on the multi-resonantis explained,The special current controller includes a six order resonantand a twelve order resonant controller.For the verificationofthe analyseand the special control strategy, a 2 MW DFIG modelis built in dSPACE.Based on ControlDesk which provided by dSPACE,the real-time simulation is realized.The simulation results indicate that the control scheme with multi-resonant current controller alleviate the distortion of 5th,7th,11 th,13thharmonicsobviously,improve the stator current waveform andstabilize the busbar voltage.The using of the new controller improves the adaptation of DGIG with grid harmonics,the reliability of the experiment is confirmed as well due to the real-time simulation.