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A model control and a filter suppressing oscillation of the output voltage that can obtain the stable output voltage of a dc-dc converter have been proposed previous. Although there is a problem that the condition on the input side of dc-dc converter is changed when it connects the load equipment to renewable energy generators through the DC bus, since the renewable energy generators are sometimes...
This paper presents a dc-link voltage control for a three-phase PWM rectifier that combines an adaptive PI controller with a feed-forward of the load current which is estimated through a Luenberger observer. A systematic design approach is presented for the adjustment of the adaptive PI and the observer gains. Several simulation and experimental results are presented and discussed in order to show...
The proposition for this study is to assess how much simulation results can differ from real measurements on the implementation of a control strategy for a grid-connected PV inverter. The system is simulated in Matlab/Simulink and experimentally evaluated on a real low-voltage distribution grid. The PV inverter is implemented using a power-hardware-in-the-loop platform running the control algorithm...
We have proposed the sensorless model control based on the static model equation of the dc-dc converter that is able to change the bias value corresponding to changes of the load current, the input voltage and output voltage. The sensorless model control can regulate the output voltage. On the other hand, the transient response of output voltage is not improved. Therefore, an improvement of the transient...
Recently, the energy saving is required. It is necessary for the energy saving to operate the electric device in the sleep mode. Therefore, the output voltage rises abnormally because the dc-dc converter is required the operation in the discontinuous current mode. Therefore, we have proposed the model control using static model and strived for improvements. In the proposed method, the output voltage...
This paper presents a model-based predictive control scheme for a dual-output Nine-Switch Inverter (NSI) with output filter. The conventional Pulse Width Modulation (PWM) method for NSI control is very complicated, it requires a multi-loop control scheme and implementation incurs high computational costs. Conversely, the proposed predictive control scheme is simple and controls two the three-phase...
Shunt active filters are used to compensate for electric current harmonics in the line grid. In this paper the internal model principle is exploited to achieve asymptotic harmonics cancellation. A detailed tuning procedure for this kind of controller is provided, keeping into account the effects of digital implementation. Extensive experimental results show the effectiveness of the proposed approach.
Discrete time digital linear regulators, including low dropout regulators (LDOs) have become competitive in muti-Vcc digital systems for fine-grained spatio-temporal voltage regulation and distribution. However, wide dynamic current range of the digital load circuits poses serious problems in maintaining stability and high efficiency at all corners. In this paper we present a control model for discrete...
In this paper a new fifth-order buck converter is proposed. This converter gives better bucking features at moderate duty ratios. Through time-domain analysis steady-state converter performance and then converter elements design expressions are obtained. The proposed converter performance is compared with conventional buck converter both from voltage bucking and input current ripple point of view...
The digital control system of three-phase two-zone thyristor AC voltage regulator is considered and analyzed. This system has been assembled on the base of microcontroller Atmel AVR Atmega128A. The system of automatic control and protection system of current to prevent the regulator from the transition to emergency mode is proposed. The results of developing control system model are presented.
This paper presents a novel current mode controller for the synchronous rectifier Buck (SR-Buck) converter. In term of the discrete equation, the required duty cycle can be calculated directly with two parallel terms: the current term and the voltage term. Based on the analysis of the proposed algorithm, the small signal model of the closed-loop system is derived, thus a proportional and integral...
In this paper modeling and control of a two-input boost type dc-dc converter is presented. Discrete-time models of the converter are established for trailing-edge modulation. Digital single-loop current and voltage-mode controllers are then designed based on these discrete-time models. The digital current controller keeps limit on the power drawn from the weak source, while the digital voltage mode...
In this paper analysis and digital controller design for a soft-switching high gain boost converter (SSHBC) is presented. The steady-state performance and soft transition methodology has been analyzed and then its discrete-time transfer functions models are formulated using system identification toolbox of the MATALB. These linearized models are then used in the design of digital voltage-mode controller...
This paper presents a novel prediction based digital control dc-dc converter. In this method, addition to the P-I-D control as the feedback control, the prediction based control is used as the feedfoward control. In the feedfoward control, the neural network based method is adopted. This works to improve the transient response very effectively when the load is changed quickly. As a result, the undershoot...
In this paper analysis and robust stabilizing digital controller design for a zero-voltage turn-ON boost converter (ZVTBC) is presented. The steady-state performance and zero-voltage switch-ON methodology has been analyzed and then its state-space models are formulated to obtain the small-signal models. These linearized models are then used in the design of digital voltage-mode controller. A loopgain...
This paper presents a DSP based direct digital control (DDC) design and implementation for a high power boost converter. A dual loop voltage control is digitally implemented using DSP. The real time workshop (RTW) is used for automatic real-time code generation. A laboratory prototype of a 20 kW boost converter based on TMS320F2808 DSP is presented. The proposed controller performance is investigated...
The purpose of this paper is to present a new digital model control which detects multiple output values of multiple-output dc-dc converter. In this method, the P-I-D control and the static equation model are performed. The dynamic characteristics of digital control converter are improved as compared with the conventional one.
This paper deals with the holistic modeling approach of a combined Photovoltaic, Wind and Fuel Cell power system. The method is using the DK5 modeling/design environment from Mentor Graphics and is based on the new Handel-C programming language. The goal of the work carried out was to achieve an optimized holistic digital control system design, followed by its rapid prototyping into a single Field...
This paper characterizes two digital V2 control schemes using for the buck converters with small-ESR capacitors based on the presented small-signal models. Due to the sampling effects of the analog-to-digital converters (ADCs), the digital V2 control system performances are not as good as the analog ones, even using the inductor current sensing feedback. The major issue is that in order to stabilize...
In this paper, a terminal sliding mode control (TSMC) with grey prediction for UPS inverters is proposed to maintain very low total harmonic distortion (THD) output voltage under rectifier-type loading conditions and fast dynamic response under step change loading conditions. The proposed controller combines the merits of terminal sliding mode control and grey prediction. TSMC can drive the system...
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