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控制技术是应用变流器在配电网实现电能质量补偿的关键。作者针对三线三电平并联型电能质量调节器提出了在 dq坐标下求取参考电流和应用改进的无差拍控制与校正的电压空间矢量调制相结合跟踪参考电流的控制方法。MATL AB下的仿真结果表明这一控制方法可以使三电平并联型变流器同时完成抑制谐波、补偿无功和不对称的综合功能 ,并且达到良好的动态和静态效果。
Control technology is the key to the application of converter in the distribution network to achieve power quality compensation. Aiming at the three-wire three-level shunt-type power quality regulator, a control method of tracking the reference current is proposed based on the reference current dq coordinates and the application of improved beatless control and correction voltage space vector modulation. Simulation results under MATL AB show that this control method can make the three-level shunt converter achieve the functions of harmonic suppression, reactive power compensation and asymmetric compensation at the same time, and achieve good dynamic and static effects.