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This paper presents the design considerations and the implementation of a cd-cd buck-boost converte, which can process the energy transferred from the ultra capacitors (UC) bank and batteries to the load (motor drive system of an Electric Vehicle EV). The UC bank is used as auxiliary source to supply the motor drive system which allows recovering the energy generated during the regenerative breaking;...
The small signal transfer function of the Boost converter with Constant Power Loads(CPLs) is derived and the condition of stability for the system is obtained. State feedback exact linearization and optimal tracking control technique are applied to control the system. The nonlinear control law is verified using SABER. The simulation results show that the nonlinear controller can make the system operation...
In this paper the input-output linearization technique is used to synthesize a control system for an AC/DC three-phase converter. The control system is composed of two control loops connected in cascade. The inner loop, the current control loop, is realized in a synchronous reference frame. The outer control loop maintains the dc capacitor voltage in a required level. As there are only two input control...
Passivity-based control (PBC) is based on a procedure including energy/power shaping and series/parallel damping injection to control several nonlinear systems such as power converters. In this paper, PBC is used to design a controller for three phase/level/switch PWM (Vienna I) rectifier. Passivity-based controller is supposed to regulate the output voltage and the input three phase sinusoidal currents...
We are considering the problem of controlling AC/DC full bridge converters. The control objectives are twofold: (i) guaranteeing a regulated voltage for the supplied load, (ii) enforcing power factor correction (PFC) with respect to the main supply network. The considered problem is dealt with using a nonlinear controller that involves two loops in cascade. The inner-loop is designed, using sliding...
Conventional PWM voltage mode or current mode control techniques are commonly used in practice for controlling switched-capacitor converters. However, such control methods are only useful for applications involving small operating regions. This paper discusses the application of nonlinear control in the form of sliding mode control on switched-capacitor converters. The result is an enlarged operating...
This paper presents the digital current mode control employing nonlinear resistive current mode control and digital state feedback control using the pole placement technique for parallel interleaved DC-DC converters. The former method achieves current sharing by converting the effective input characteristic of the converters seen by the source to a resistive load sink. The latter method derives the...
Control of a class of nonlinear/uncertain systems is discussed via a variable structure systems approach. In this paper the so-called unit vector control structure is exploited to the development of numeric design algorithm. A control law will be presented which induce and maintain sliding despite the presence of both matched and unmatched uncertainty. The natural extension to an controller design...
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