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Distributed power systems are getting more attention now-a-days due to their high flexibility and reliability. In this paper, predictive current control strategy is proposed for the grid-connected four-leg inverters. This kind of converter is developed to deliver power to the unbalanced/nonlinear three-phase loads and as well to the grid. The discrete-time model of the converter and load is used to...
A n-stage cascaded boost converter connected with a single active switch is usually used in applications with high conversion ratio. It has been reported that the dynamic of the transfer function output-voltage-to-duty cycle related with the first inductor is minimum phase and the second, third or n inductor current has right-hand side (RHS) zeros; as a result, it is obtained and increment of complexity...
Modulation of multilevel converters is the focus of researchers looking for high quality of the output waveforms with low losses. This paper shows that multiple switching sequences can be used in order to generate the desired phase voltage. A simple two-dimensional modulation technique for two-cell multilevel cascaded converters is introduced in this paper. Using a two-dimensional control region,...
This paper presents a new power regulation method for contactless power transfer systems that combines current magnitude control of a series tuned resonant converter with energy injection concepts suitable for constant load or single pick-up applications. In the latter, the control of the primary converter operates with asymmetrical control, to regulate the magnitude of the high frequency primary...
This paper presents a novel constant switching frequency band controller for dynamic voltage restorer (DVR) with a proposed filter structure. The switching operation of voltage source inverter (VSI) based on band controller which restricts the injected voltages within a band, is explored. This control method of the VSI inherits merits such as fast dynamic response, robustness, zero magnitude/phase...
The mathematical model of the three-level PWM rectifiers is set up in this paper. By comparing it with the model of DC motors, some similarities are established. Based on the state feedback decoupling, the dual-loop close control scheme of DC motors is implemented to three-level PWM rectifiers. As a result, the three-level rectifier has favorable dynamic and steady state performance, sinusoidal input...
This brief presents a new return-current control method for a multioutput step-up/down dc-dc converter. Compared with prior multioutput dc-dc converters, the presently described converter can generate outputs higher or lower than the input voltage with simple control-loop compensation while guaranteeing stability in a wide load range. Using a 0.5-mum bipolar CMOS (BiCMOS) process, a converter having...
A 100 MHz switching power supply with two-loop control is proposed for radio frequency power amplifiers. The power supply has a tracking bandwidth of 5 MHz and an estimated efficiency of 80%. The two-loop topology consists of a buck converter with an inner loop for one-cycle control and an outer loop that contains a PI compensator. With the two loops a stable feedback control is obtained with an excellent...
This paper presents a filter structure for improving the performance of switching band controlled Dynamic Voltage Restorer (DVR) and a systematic design procedure for the passive filter components. The switching operation of VSI is accompanied by a band controller which restricts the injected voltages within a band, defined about a reference voltage. Switching band control method exhibits merits such...
Interest in multilevel power converters has been increased in the last decades due to numerous advantages. Therefore, new control concepts have to be developed or existing control techniques must be extended to take advantage of these benefits.However, although multilevel inverters present numerous advantages, some drawbacks are evident. They require a higher number of semiconductors and either multiple...
The voltage mode control (VMC) technique of switchmode converters has been widely used in renewable PV system applications. The feasibility of the current mode control (CMC) techniques in PV applications is also promising because of the irregular nature of the PV source. This paper presents a comparative assessment of the VMC and four different CMCs of switch-mode converters for photovoltaic (PV)...
A fully-integrated DC-DC step-down converter in a 130 nm 1.2 V CMOS technology is realized, with an integrated metal-track inductor and integrated MOS and MIM capacitors. The converter is designed to generate an output voltage of 1.2 V out of a 2.6 V power supply. No external components are required. The maximum power conversion efficiency is 52%, for a voltage conversion ratio of 0.46. This is a...
The purpose of the article is to introduce a new DC-DC converter typology, which has the advantages of simple circuit typology with no total device rating penalty, soft-switching implementation without additional devices, simple control and low cost. It is promising for medium and high power applications where high power density, low cost and high reliability power converters are required, such as...
In this paper, the mathematical model of three-phase four-wire three-level neutral-point-clamped (NPC) voltage source rectifier (VSR) using switching functions is founded and its operating principle analyzed. Then a new nonlinear control law based on Lyapunovpsilas stability theory for the PWM rectifier is presented. With this control law, the converter can be stabilized globally for handling large-signal...
DC-DC switch-mode converters recently have been increasingly used in many EV and HEV applications when the power distribution is in the form of multi-converter DC electrical system due to their good specifications. Different control strategies such as sliding mode control and current mode control have been applied to DC-DC converters to improve their robustness, efficiency, and stability. However,...
Nowadays, most digital control for motion and power electronics systems are based on DSPs. This paper presents a FPGA-based digital control for a DC-DC converter. The main difference from DSP-based solution is that FPGA allows simultaneous execution of all control procedures, enabling high performance and novel control methods. The control algorithm has been developed using a VHDL language or CAD...
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...
A novel control strategy for the operation of a permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine is presented in this paper. The direct drive PMSG is connected to the load through a switch mode rectifier and a vector controlled pulse width modulated (PWM) IGBT-inverter. The generator side switch mode rectifier is controlled to achieve maximum power from the...
This paper presents a comparative study between two control strategies based on the sliding mode control theory applied to a switched DC-DC boost converter. A master-slave control structure is applied to the converter such that the inner control loop is a sliding mode current controller and the outer voltage controller is designed according to what follows. First a proportional-integral compensator...
This work applies LMI control to a nonlinear switched mode power converter. The linearized model of the converter presents a non-minimum phase response. Nonlinearities and uncertainty are taken into account using a polytopic model. The LMI formulation permits to build a state-feedback controller to stabilize the plant with the maximum perturbation rejection and a certain pole placement constraint...
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