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In this paper, the use of an adaptive control method for an induction motor is described. Using the conventional adaptive control method, it is possible to stably estimate the inverse time constants (both primary and secondary) during the powering mode. However, it becomes unstable during the regenerating mode. To solve this problem, there is a method that changes the adaptive control gain in the...
Palladium catalyzed direct coupling of aryl halides not only with various carbon nucleophiles having acidic C-H bonds, but also with aromatic and heteroaromatic compounds accompanied by cleavage of their unactivated C-H bonds, has been significantly developed in recent years. In this review the progress of these reactions as effective methods for preparing aromatic fine compounds is summarized. A...
The PV generation is increasingly popular nowadays while typical loads require more high power quality. Basically, one PV generator supplying to nonlinear load is desired to be integrated with a function as an active power filter (APF). In this paper, the proposed three-phase three-wire system including PV generation, DC/DC boost converter to extract maximum radiation power by using MPPT and DC/AC...
Regarding to dispersed generation field, an islanding is known as a situation that those generators are disconnected from the utility feeders and a bunch of local loads being powered by them is isolated. Accordingly, anti-islanding schemes are used to immediately detect that phenomenon in facilitating the detachment the DG or adaptive controlling of autonomous operation. Negative-sequence impedance...
Cascade multilevel inverter has been proposed for high voltage applications. However, such a topology always requires an isolated multiphase transformer for individual inverter cells, which increases the weight, volume and cost of equipment, as well as wiring complexity on transformer's secondary side. In this paper, a new flying capacitor 5 level (FC 5L) inverter with single DC source is proposed,...
Cascaded multilevel inverters with Y-connection or Delta-connection have been proposed for high voltage applications. However, these topologies always require isolated transformers for each inverter cell, which makes cost high and wiring complex. Furthermore, system weight and volume also increase accordingly. This paper presents two new types of boost type delta-connection cascaded inverters with...
Nowadays, more and more applications have been developed along with continuous research on magnetic suspension. In these applications, wide air gap structure always plays an important role. Therefore, bearingless motor with such structure which can provide large magnetic suspension force was proposed. This paper shows the experimental results of such bearingless motor based on a prototype model and...
A high response digital speed control system for the induction motor drive, which is based on the decoupled control method, has been developed. This control system can compensate the error of the time constant caused by the variation of temperature in the secondary circuit of the induction motor. This paper presents the principle of the control system and experimental results and discusses the compensation...
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