New current references calculation for dual vector controlled three level active rectifiers under asymmetrical voltage operation
by Hany A. Hamed; Ahmed Fathi Abdou; Ehab H.E. Bayoumi; E.E. EL-Kholy
International Journal of Industrial Electronics and Drives (IJIED), Vol. 2, No. 4, 2015

Abstract: This paper introduces an effective nonlinear current references calculation to enhance the performance of the dual vector control under asymmetrical grid for three level neutral point active (NPC) rectifiers. Maintaining the DC-link voltage at the desired level without oscillation is the main target for such kind of application. The asymmetrical grid voltage or voltage dip introduces negative sequence components with badly penetrates through the rectifier control loop casing DC-link to oscillate with twice grid frequency. Conventional vector control (VC) technique failed to meet the control targets under unbalance operation of grid voltage as twice grid frequency ripple pollutes the DC-link voltage. Dual vector control (DVC) concept is implemented to control the positive and negative sequence currents separately. The conventional DVC control scheme can be enhanced by incorporating line power losses for calculating the reference currents. Maintaining the DC-link voltage at the desired level without any symptom of twice grid frequency ripples is one of the control targets which can be achieved by selecting the proper constrains for calculating the current references. The proposed enhanced DVC scheme performance is verified under asymmetrical voltage dip test. The entire system is modeled and simulated with real system parameters of a 7 MW multilevel NPC-type active rectifier.

Online publication date: Sat, 30-Apr-2016

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