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An isolated power factor correction converter for power light emitting diode (LED) is presented. The converter is constructed with single-stage by employing flyback topology, and the high power factor is accomplished through controlling the PFC circuit operates on the boundary between continuous and discontinuous current mode. The principle and design(More)
Current controller is typically required in the torque ripple minimization control strategies for the switched reluctance motor (SRM). However, the conventional current controllers such as digital hysteresis controller and fixed proportional-integral (PI) controller have remarkable limitations. To improve the performances of the SRM, a novel current control(More)
Because the complementary characteristics of ultracapacitor and battery, the hybrid energy storage system with these two components will be provided with better performances, such as not only power density but also energy density will be upgraded, life time of the system will be prolonged. This paper proposes a active hybrid energy storage system of(More)
This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous(More)
Dynamic response of DC bus voltage for PWM rectifier is very important, because higher response means little DC bus capacitor. A fuzzy logic controller for the DC bus voltage was designed in this paper in order to improve the dynamic response‥ The overshoot and the start-up time of the DC bus voltage response for the traditional PI controller and(More)
This paper presents a novel integrated control scheme for three-level neutral point clamped (NPC) based PWM rectifier-inverter. Two measures are taken to minimize the size of dc-bus capacitors which are expensive, bulky and have a lifetime limit. Firstly, the direct power control (DPC) for front-end three-level PWM rectifier is applied, which will provide(More)
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