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In this paper, a three-level inverter fed induction motor drive operating under Direct Torque Control (DTC) is presented. DTC do not show good performance in low speed region due to stator flux demagnetization that relates to variation in stator resistance. Here, a sinusoidal wave is used as dither signal of minute amplitude (for torque hysteresis band and flux hysteresis band respectively) in the...
In this paper forced switching control of three-level Neutral Point Clamped (NPC) ac-dc converter having rectification and regeneration capability is presented. This converter is utility friendly and maintains the dc-link voltage constant. Hysteresis current controller (HCC) is used for current control because of its simplicity, easy implementation and good dynamic performance. The comparison of a...
Industrial and traction drives (used in automobile and electric locomotives) using induction motor, require a good control over torque and speed, reversible and regenerative speed control operation. Hence the drive topology requires both ac to dc conversion and dc to ac conversion system. In this paper, a three-level utility friendly the front-end neutral point clamped (NPC) converter system having...
A new soft-switched bidirectional dc-dc converter with coupled inductors is proposed in the paper. The proposed converter can operate with soft-switching, fixed switching frequency, and the switch stresses of a conventional PWM converter with coupled inductor regardless of the direction of power flow. These features are due to a very simple auxiliary active clamp circuit that is operational regardless...
A new soft-switched bidirectional dc-dc converter is proposed in the paper. The proposed converter can operate with soft-switching, a continuous inductor current, fixed switching frequency, and the switch stresses of a conventional PWM converter regardless of the direction of power flow. These features are due to a very simple auxiliary circuit that is operational regardless of the direction of power...
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