Adaptive dead-time compensation of H-bridge cascaded STATCOM

In this paper,in order to eliminate the effect of STATCOM dead-time effect on the voltage and current,a new dead-time compensation method was proposed.According to the principle of discrete-time disturbance observer,corresponding observer was designed.The D-value of STATCOM output voltage and reference voltage caused by dead-time effect can be real-time observed on line.The D-value as a compensation value feeds back to the dead-beat control system to realize the self-adaption dead-time compensation.Simulation and experimental results show that it can effectively improve the effect of deadtime compensation,eliminate the phenomenon of the zero current clamping,and reduce current harmonic content of STATCOM.