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This paper presents the maximum constant boost control method based on the space vector pulse-width modulation (SVPWM) technique for a three-phase Z-source inverter (ZSI). The advantage of the proposed control method is not only it retains the advantages of the carrier-based maximum constant boost control strategy but it also inherits good features from SVPWM technique. Compared with the carrier-based...
In this paper, a novel control strategy for the load converter supplying the unbalanced AC load in the renewable energy resources system is presented. This novel control strategy is implemented in the a-b-c coordinate, so reference-frame transformation from a-b-c coordinate to d-q-0 rotating coordinate and inverse transformation from d-q-0 rotating coordinate to a-b-c coordinate are not required which...
In this paper, a novel maximum boost control method is presented based on the space vector pulse-width modulation (SVPWM) technique for the three-phase Z-source inverter (ZSI). Compared with the traditional carrier-based maximum boost control strategy, the proposed method has a wider linear operation range and is easier for digital implementation. What's more, the number of switching transition in...
Recently, an improved Z-source inverter topology has been proposed to reduce the capacitor voltage stress and limit the inrush current at startup in traditional Z-source inverter. The dynamic modeling and transfer functions are essential to design control schemes for this new topology. This paper presents the small signal modeling and mathematical analysis of the improved Z-source inverter. In particular,...
Positive output Luo converters are a series of DC-DC converters possessing high-voltage transfer gain and small ripple voltage and ripple current. They have very large potential in future industrial applications. Sliding mode control is an effective control method for these converters due to their nonlinear property. Previous work has solved the problem of constant switching frequency. But those controllers...
The clean energy sources such as solar cells, fuel cells and photovoltaic are attractive in the present time as fossil energy cannot be renewed and the price is soaring in recent years. A system converting solar energy to electricity and connecting to the utility network is proposed in this paper. DC-DC converter becomes necessary in this system. In order to obtain a stable output DC voltage, an improved...
Data replications is a typical strategy for improving access performance and data availability in data grid systems. Current works on data replication in grid systems focus on the infrastructure for data replication and the mechanism of replicas creation and deletion.The important problem of choosing suitable locations for placing replicas in data grids has not been fully studied. This paper addresses...
Remaining inductor current phenomena occur in several dc-dc converters operating in discontinuous conduction mode, but they do not agree with the classical definition of the discontinuous conduction mode. Since these special phenomena often cause misunderstanding during theoretical analysis and engineering applications, a reexamination is performed in this paper. Based on the investigation of energy...
A robotic formulation and control of weapon pointing systems are investigated. Specifically, a complete mathematical model for a helicopter and tank gun-turret system has been developed based on robotic formulation and methodology. The resultant mathematical model will automatically take into account the interaxis dynamics and nonlinear coupling between the azimuth and elevation axes, thereby providing...
The problem of maneuvering target tracking is considered in this paper, with an additional (and non-conventional) target attitude measurement, i.e., fusion of data from a point detection sensor with an imaging sensor. This is motivated by the fact that certain attitude variables such as target orientation can provide faster and more reliable information about target maneuvers or acceleration changes...
This paper summarizes a combined midcourse and terminal guidance and control law design of missiles to achieve range enhancement and stability with excellent intercept performance. We derive analytic solutions of a closed loop, nonlinear optimal guidance law for three dimensional flight for both the midcourse and terminal phases. Since this combined guidance law contains the proportional navigation...
The optimal control theory is applied to the homing missile lateral autopilot design. The approach is to adapt the autopilot gains to the environment model reference and to vary as functions of time-to-go to minimize the performance index. The path constraint is applied throughout the whole terminal homing period and infinite penalty is imposed at intercept. A single-plane, linear autopilot design...
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