Z源并网风力发电系统机侧谐波抑制

Harmonic Suppression for the Motor-Side Converter of the Z-Source Grid-Connected Wind Generation System

传统Z源并网风力发电系统整流侧采用的是三相不可控整流，其定子侧的电流谐波不仅会增大电机的铜耗和铁耗，降低发电效率，还有可能出现电机饱和以及失控等现象，严重影响了系统的稳定性。本文将VIENNA整流器应用于Z源并网风力发电系统，提出一种新的并网变流器控制方法。将定子输出电压的一个周期划分为6个扇区，通过扇区决策控制器给每个扇区内的不导通相提供电流通路，改善了机侧电流与机侧电压的非线性关系。比较了采用三相不可控整流器和VIENNA整流器以及最大升压控制和改进SVPWM控制下Z源并网风力发电系统的机侧电流谐波。仿真与实验结果表明，本文方法减少了定子侧电流谐波，提高了系统的效率和稳定性。

D-PMSG based on Z-source inverter uses a three-phase diode rectifier. Stator side current harmonics will not only increase the motor＇s copper and iron losses, but also produce motor saturation and runaway phenomenon. What has seriously affected the stability of the system and reduced power generation efficiency. This paper presents a wind turbine generation system based on the Z-source inverter, which takes in the VIENNA rectifier. A period of stator voltage is divided into six sectors in this paper and equivalent circuit is researched in different working stages. A Z-source inverter control strategy is proposed according to the determination of Z-source inductor value. The simulation and experimental results prove the theoretical analysis very well.