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The power/signal synchronous transmission between converters has attracted much attention since no extra independent signal transmitting equipment is required. In this paper, bifurcation behaviors of a cascaded two-stage Buck-Boost converter are discussed by simplifying the second stage boost converter as constant power load. The amplitude variation of the bus voltage caused by bifurcation is used...
Although multi current-valley control can be used to eliminate the low-frequency oscillation for pulse train controlled DC/DC converters operated in continuous conduction mode (CCM), the number of preset current-valley values are necessarily increased, which will increase the complexity of the controller. Meanwhile, the output voltage ripple is uncontrollable and varies with the changes of the load...
This brief proposes a floating emulator circuit for mimicking the dynamic behaviors of flux coupled memcapacitors (MCs) by making use of common off-the-shelf active devices. The equivalent constitutive relation of the coupled MC emulators is theoretically presented in details. The coupled MCs are then utilized to structure new relaxation oscillators (ROs) with the purpose of achieving controllable...
In this paper, the structure of switched reluctance generator wind power system is introduced. Then compared with the existing maximum power point tracking method, a speed disturbance variable step hill-climbing search method is given. And the implementation process of maximum power point tracking is analyzed in detail. Afterwards, a strategy of the maximum power point tracking and voltage closed-loop...
This paper presents a method of controlling switched reluctance generators (SRG) for maximum efficiency where the SRG operates in single pulse mode. The analysis and modeling of experiment data showed that the optimal-efficiency turn-on angle can be characterized as a function of output power and speed. Thus the maximum efficiency is achieved where the turn-on angle is fixed at optimum value and the...
In order to minimize the output low-frequency oscillation of pulse train (PT) controlled buck converters operated in continuous current mode (CCM), a modified Buck converter by using coupled inductors is newly proposed in this paper. The discrete-time model and the low-frequency oscillation mechanism of this new converter are analyzed in details, and the corresponding solution method was given for...
In order to regulate the dc-link voltage and achieve the bidirectional power flow capability, a traction driving system with bidirectional quasi-Z-source inverter (BQ-ZSI) for electric vehicles (EV) is proposed in this paper. Based on analyzing the circuit structure and small signal model, oscillation of the dc-link voltage of BQ-ZSI could be caused when the disturbances on dc input voltage occur...
Tremendous efforts have been put into dissecting the inherent characteristics and potential applications of Memcapacitor (MC), which possesses unique abilities of storing both information and energy [1]. Recently, coupling is disclosed as the third relation beyond series and parallel connections of memristive circuits in [2], of which the mechanical dynamic coupling of MCs is taken into account for...
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