Abstract
In this paper, a novel natural frame control is proposed for a single-phase cascaded H-bridge (CHB) multilevel converter. Natural frame control can acquire sinusoidal current waveform and achieve the balanced control of dc-link voltage without phase-locked loop or any coordinate transformation. Compared with conventional single-phase dq control, it only needs an imaginary voltage component without requiring an imaginary current component, which can eliminate additional current delay. Moreover, a new imaginary voltage construction method, referred to as fictive-phase construction (FPC), based on phase leading is presented. The delay time of FPC is only 1.67 ms theoretically under the condition of 50-Hz frequency, which is faster than the existing delay time of 5 or 3.33 ms. This effectively improves the real-time performance of the system when grid voltage fluctuates. Simulation and experimental results for a three-cell CHB converter validate the proposed control method.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
