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This paper proposes a fault-ride-through (FRT) method for a single-phase grid-connected inverter with a minimized inductor by reducing the inverter output current overshoot. When a low-inductance interconnected inductor is used, the inverter output current overshoot becomes very high at a voltage sag and a voltage recovery. Therefore, a grid-voltage fault stops the operation of the grid-connected...
When a inductance of a single-phase grid-connected inverter is minimized, the effect of the disturbance to the current control such as the dead-time error voltage increases. This paper proposes a disturbance compensation method by using a high-performance disturbance observer. In particular, in the control system, the current controller is implemented by the digital signal processor, whereas the high-performance...
A proposed voltage error correction method that uses a disturbance observer for various types of induction motor control was evaluated. The features of the proposed control method are: 1) control parameters are easily determined according to the motor model and the parameter sensitivity is robust, and 2) the proposed method can be applied for field-oriented vector control, speed sensor-less vector...
This paper proposes a dead-time compensation method with a disturbance observer and a current controller for V/f control. Dead-time compensation is very important to improve motor drive performances in the low speed region. The proposed compensation method is composed in the d-q rotational frame. The ripple of the d-axis current caused by the dead-time is suppressed by an auto current regulator, the...
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