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In last years, behavioral models of power converters are becoming an interesting tool for the system level analysis of power electronics based systems, when these ones are composed of converters whose internal data are unknown. In this paper, a new "grey box" behavioral modeling and identification procedure for voltage mode controlled buck derived converters is proposed. The model is composed...
Nowadays, "black box" behavioral models of power converters are becoming interesting for system level simulation of power electronic based systems. Hence, new modeling and identification procedures become needed. In this paper, an easy modeling method and identification procedure based on a transient response analysis is presented. Using this method, a behavioral model with reduced order...
EMI filters are mainly made up of passive components including capacitors and inductors. These passive components can be a significant portion of the total converter system volume. Integration techniques can be used to improve space utilization and reduce the total system volume. This paper gave a comparison on existing passive integration technologies, and then developed an integrated EMI for 2 kW...
This contribution deals with overvoltage protection in inverter-fed drives by varistors. Several kinds of overvoltage in combination with very low rise times impose extreme dielectric stress on the insulation of electrical machines. With varistors it is possible to decrease these overvoltages in combination with an extended rise time of the impulses occurring at the machine terminal. During this service...
In order to find the optimal converter topology for a given AC motor drive, as defined by its mission profile, suitable assessment criteria have to be applied. A new semiconductor chip area based approach is proposed to compare and assess different motor drive converter topologies. It determines the total semiconductor chip area based on the drive's operating point and the optimal partitioning of...
In this paper, the most suitable time to replace to the damaged element in open-loop and closed-loop control for the fault-tolerant induction motor drive system is presented, with a previous stage of fault-diagnostic to detect a short-circuit or open-circuit failure in the power device. The technique is based on the connection of bidirectional switches to isolate electrically the damaged element by...
In order to accommodate increasing energy demand from "more electrified" domestic and vehicular applications, simultaneous use of various renewable sources are encouraged. Multiple converters are commonly adopted to process the renewable power as a distributed power system (DPS). However, due to the loose structure of DPS, reliability and load/source regulation will degrade as compared to...
A control technique is developed for parallel operating inverters with no control interconnections in microgrid. This technique uses only locally measurable feedback signals to allow some independent inverters to share the active power for loads, while the others to provide reactive power compensation for loads, both in proportional to their capacities. Simulation results prove the validity of this...
Islanding detection and anti-islanding protection are the essential functions of the gird-connected inverter in DG systems. This paper focuses on the non-detection zone (NDZ) with passive islanding detection method for the DG system with the current control scheme. The parameters of the point of common coupling such as the voltage amplitude and frequency are studied through mathematical derivation...
With the shortage of the energy and ever increasing of the oil price, research on the renewable and green energy sources, especially the solar arrays and the fuel cells, becomes more and more important. How to achieve high step-up and high efficiency DC/DC converters is the major consideration in the renewable grid-connected power applications due to the low voltage of PV arrays and fuel cells. The...
This paper presents a dynamic model of the active front-end (AFE) converter under the synchronous reference frame. Transfer functions of the closed-loop control based on this dynamic model are verified experimentally in the frequency domain. Bode plots of these transfer functions are given to validate this synchronous frame-based dynamic model. Based on these results, this paper presents the control...
The ZVS-SVM controlled three-phase boost rectifier can realize ZVS operation for all switching devices. In this paper, the operation principal and design guideline are described in detail. The soft switching restriction is analyzed in particular. The experimental results of a 40 kW hardware prototype are presented to show the superiority of the topology and the reduction on loss.
Two techniques are presented to balance the filter capacitor voltages of a multi-pulse rectifier with active injection operating on a variable frequency supply. The active injector consists of a low-rated, bidirectional switch that modifies the behaviour of a 12-pulse rectifier at either low or high-frequency, resulting in 24-pulse or multi-level PWM operation respectively. The operation of the rectifier...
This paper proposes a three-phase, two-switch, buck converter that can operate with input power factor correction. The key features of the proposed converter are that a switch in it can operate with almost half the voltage stress of that in the standard three-phase, single-switch buck converter and with less current stress. In the paper, the operation of the converter is discussed and a detailed mathematical...
Design consideration of a three-phase inverter with 1200 V Si-IGBT and SiC-JBS hybrid pairs has been implemented to further reduce the power loss and increase the power density. A low-on-voltage SiC-JBS has been developed to reduce the conduction loss. In order to minimize the switching loss of Si-IGBT, a high-speed gate driving technique is introduced. A 4 kVA class three-phase hybrid pair inverter...
A novel soft switching inverter using two small coupled magnetics in one resonant pole is proposed to guarantee the main switches operating at zero-voltage-switching (ZVS) from zero load to full load and the auxiliary switches at zero-current-switching (ZCS) with load adaptability and small current stress. Since independent magnetics structure avoids the unwanted magnetizing current freewheeling loop,...
This paper presents a variable timing controlled soft-switching inverter. The proposed timing control is based on a simple voltage sensing circuit that detects zero voltage crossing condition to determine the main switch turn-on time. The proposed technique can be applied to different types of zero-voltage switching type inverters. In this paper, the coupled-magnetic type soft-switching inverter is...
The paper focuses on a new driving strategy for improving the efficiency of power converters even if they are not used at there nominal power. The converters are using an output filtering structure with magnetical coupling. These filtering structures are usually employed to minimize in a significant way the mass of the converters. These filters are normally sized to work with a fixed number of phases...
A hybrid structure three-level resonant converter suitable for wide input and load variation is proposed. A hybrid combination of a three-level converter controlled by phase-shift modulation and a half-bridge converter is presented. Since the voltage of each switch is one half of the input voltage, it has advantages of the choice and characteristics of switches. The ZVS operation of the converter...
The peak-current control that is modeled in this paper is a novel variable-frequency control that maintains regulation in a flyback converter by enabling and disabling cycles instead of modulating the pulse-width, which allows for elimination of feedback compensation and can provide for peak power 3 times higher than the rated full load power without increasing the power supply component sizes. A...
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