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This paper presents improvement of an output performance of a two-switch forward converter with a Lead-Lag (LL) controller. The controller design is illustrated and its ability to regulate the converter's output voltage is evaluated experimentally. It is revealed that the converter employing the LL controller can achieve a higher system bandwidth compared to that employing the Proportional-plus-Integral...
One of the primary challenges with fully integratedvoltage regulation is to maintain a high power efficiency overa wide output current range. A multiphase distributed switchedcapacitor (SC) converter with a new control method that adaptivelyturns on and off certain interleaved stages is proposed. By controlling the number of active interleaved stages basedon the load current, the proposed system achieves...
Multiple-input converter (MIC), which has higher efficiency, less component count, lower cost and simpler control method, is a promising candidate for energy harvesting in hybrid systems, and for power distribution in micro and nano grids. The principle of the proposed advanced-timesharing switching (ATSS) strategy is that the effective duty ratio of each switch is an integer multiple of a common...
This paper proposes the simple and seamless operation technique for bi-directional LLC resonant converter. Generally, bi-directional operation of LLC resonant converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences (the switching timing between high voltage side and low voltage side) has...
This paper describes the detailed design of a singlephase multi-level single-phase shunt current injection converter based on cascaded H-bridge topology. The shunt current injection converter can inject an arbitrary current perturbation at three-phase power system interfaces, in order to identify small-signal dq impedances. Special attention is given toward the selection of inductors and capacitors,...
Single phase matrix converter has been developed to perform the functions of all operations in one converter that is a single circuit is developed that can perform cycloconverter, cycloinverter, ac voltage regulator, rectifier, inverter, chopper operations. The well-known sinusoidal pulse width modulation is used to synthesize the output. IGBT with antiparallel diode is used as a switching device...
Resonant dc-dc converters have been applied to many industrial applications. In order to dc-dc converter operates in fixed frequency and the zero-voltage-switching (ZVS) condition per different loads, using robust control theory has been reported. In this paper, an optimal sliding mode controller for dc-dc series resonant converter is proposed to control the output voltage of converter in presence...
The Modular Multilevel Converter (MMC) is one of interesting transformerless multilevel converter topology intended for medium and high-voltage power conversion. The MMC is formed by a cascade connection of several identical submodules and requires charge balancing of the multiple floating capacitors of the submodules. This paper proposes a new balancing method for the floating capacitor voltage....
This paper deals with controlling of the two-stage two-phase electronic systems with orthogonal output voltages and currents — DC/HF_AC/2AC using FPGA. Design and prototyping of the two-stage DC/HF_AC/2AC high frequency converter with two-phase orthogonal output using two single-phase matrix converters in full-bridge connection operating in either unipolar or bipolar PWM. Simulation and experimental...
A Zeta mode three-level AC/AC converter proposed utilizes three-level voltage in one switching period before output filter to form output sinusoid voltage, which can get a better spectrum and reduce bulk of the filter. The frequency of harmonics depends on switching period, so it can be filtered easily when the converter operates in high frequency. Compared with Two-level ac chopper, the amplitude...
Recently AC voltage regulators, which adopt the method of AC-DC-AC transformation, not only have the problems of big bulk and high noise, but also with high voltage switch stress and harmonic interferences. To solve these problems, a new kind of high frequency isolated three-level AC-AC direct converter is proposed, operational principle, frequency structure of the voltage in front of the output filter...
Nowadays, the typical railway traction chain, which operates under alternative power supplies, includes a heavy and bulky transformer. In order to reduce the size and the weight of the input transformer, a medium frequency topology, which involves switches in soft commutation mode, is proposed. A test bench, based on one elementary stage of the complete structure, was built. It allows characterizing...
This paper proposes a coordinated control method of the diesel generators (DGs) and battery storage system (BSS) in AC island microgrid. When the DGs run as the main power source, an auxiliary power control signal is added to the conventional droop control for BSS to prevent system collapses caused by long-time over-current of the DGs, which can improve the stability of the microgrid. To avoid short-term...
Two new SMPS (a Boost and a Buck- topology) based three phase cyclo-converters are presented. Instead of using 12-SCR model, in each cycle of the input AC signal the voltage is made unidirectional by employing full bridge rectifier.To provide output voltages at opposite polarities two SMPS topology based converters (one P and one N converter) are differentially connected across the load. This newly...
LLC resonant converter is proposed for Front End DC/DC conversion application. Three advantages are achieved with this resonant converter. First, ZVS turn on and low current turn off of MOSFETs is achieved. The switching loss is reduced so we can operate the converter at higher switching frequency. Second advantage is that with this topology, we can optimize the converter at high input voltage. And...
On load, transformer primary tap changing is not common in high frequency converters. This paper investigates a new converter topology to drive primary tapped transformers. The ideas that have been introduced previously are simply implemented into existing converter topologies which have been modified to accommodate a primary tapped transformer. The effects of efficiency with variation of source voltage...
In this paper, a full-bridge full-wave high frequency link inverter with active clamper is proposed. Analysis and modeling of such an inverter are provided. A PR controller is developed and implemented for the inverter. The effectiveness of the proposed inverter and its control strategy are verified by using experiments.
With the development of large power electronics, application of the large power converter using the self-controllable devices such as IGCT becomes the trend. The large power high performance AC-DC-AC converters with high output frequency and less harmonic component are widely required in many fields such as metallurgy and transportation. The 16MVA voltage source converter with IGCTs is introduced...
In order to solve the problems existed in the field of high power applications such as voltage stresses and harmonic interferences of the two-level AC / AC converter, a new kind of high frequency isolated half-bridge three-level AC / AC direct converter is proposed, which can convert one alternating voltage with instability distortion to another regulated constant frequency sinusoidal voltage. The...
This paper presents a modular AC-AC converter with high frequency AC link. It is constructed from connecting multiple current mode AC-AC converters with high frequency AC link in series at the input sides and parallel at the output sides (ISOP). This topology allows the use of low voltage power switch. Control strategy and operation principle of the converter are investigated. Four operation modes...
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