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Dead-time causes distorted output current in current-controlled three-phase PWM inverters. Instead of using a real inductor, a virtual inductor is proposed in this paper to minimize the dead-time effects. Virtual inductor is an additional controller block that changes the system behavior so that it is similar as if there is a real inductor in the system. As it is virtual inductor, we have no problems of cost and losses. How to design a virtual inductor for dead-time effect minimization is presented in this paper. The effect of low-pass filter (LPF) which is mandatory in virtual inductor application is also presented in this paper. Simulation and experimental results are included to show the effectiveness of proposed virtual inductor.

Minimization of Dead-Time Effect in Current-Controlled Three-Phase PWM Inverters by Using Virtual Inductor