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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 power. On these bases, a direct power control...
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 strategy based on adaptive sliding mode...
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 method of the converter is presented. A 180∼.250V...
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 battery/ultracapacitor based on bidirectional converter,...
This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier. The mathematical model of three-level pulse width modulated (PWM) rectifier is established, and the direct power controlled strategy based on sliding mode control (SMC) is presented. Conventional PI controller is replaced by SMC to obtain fast and accurate response of dc-bus...
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 fuzzy logic controller were compared respectively....
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 better dynamic performance for the dc-link...
It appears that the main mechanism of 44 Ti nucleosynthesis in supernovae involves an alpha-rich freezeout of hot matter. Late assembly of 12 C nuclei via triple alpha reactions is followed by a rapid sequence of captures upward to the 44 Ti. Considering that radioactive 44 Ti is one of the premier targets of gamma astronomy, having already been...
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