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On the behalf of organizing committees of 2014 IEEE International Power Electronics and Application Conference and Exposition (IEEE PEAC'2014), I would like to welcome all colleagues around world to participate in the symposium which will be hold from 5th to 8th November 2014 in City Shanghai, China.
A novel two winding coupled-inductor step-up gain boost-flyback converter is proposed in this paper. The proposed converter consists of a boost cell and a flyback cell, with a two winding coupled-inductor to achieve high step-up voltage gain at reasonable duty ratio. The voltage gain of the proposed converter is improved with input-parallel output-series of two windings of coupled-inductor. The operating...
A high efficiency high voltage step-up gain DC-DC converter is proposed and studied in this paper. The proposed converter consists of a boost converter cell and an isolated single-ended PWM resonant converter cell, with their outputs connected in series to achieve high voltage step-up gain. By using quasi-resonant technology, zero current switching (ZCS) for the diode on the secondary of transformer...
In order to increase the output voltage range of photovoltaic panels, battery and fuel cell monomer efficiently in the distributed generation system, In this paper, a novel Z-source high step-up boost converter is presented. With a unique X-type Z-source network, clamping voltage of pump capacitor is improved. The proposed converter achieves a high voltage gain without an extremely switch duty cycle...
This paper proposes a novel high gain DC-DC converter, the core structure of the circuit is a bridge which is composed of two power switches and two equivalent voltage sources. The two equivalent voltage sources are charged in parallel during the two switches turn on and are discharged in series during the two switches turn off, which makes the converter produce high output voltage to realize high...
A novel high step-up three-port converter is proposed in this paper. By utilizing coupled-inductor technique, voltage lift technique and multi-winding technique of coupled-inductor. However, main switch suffer from high voltage spike during the turned-off period. Hence, for suppressing and recycling the energy, the clamp circuit technique is applied. Finally, the prototype of the proposed converter...
A novel high step-up DC-DC converter is proposed in this paper. In this paper, interleaved inductors are utilized to combine with switched capacitors to generate a simple circuit structure. This topology aims to reduce current stress in low-voltage side further, decrease voltage stress in high-voltage side, and to achieve output voltage regulation with a wide range input. The operating principles...
To accurately assess the reliability level of wind power converter for doubly fed induction generator (DFIG) system, an assessment methodology for power cycling capabilities of insulated gate bipolar transistor (IGBT) modules is investigated for wind power converter. First, power losses and junction temperatures calculation models of IGBT module are presented, the junction temperature calculation...
Due to a series of unique merits, Modular Multilevel Converters (MMCs) have been developing dramatically in the last decade. However in some applications like offshore power transmission the MMC modules are subjected to a variety of tough temperature profiles with adverse working condition, all of these could lead to thermo-mechanical fatigues in the components and joints of the power modules and...
In wind power converters, the junction temperature of the power module is the crucial factor which affects its reliability. This paper developed a comprehensive thermal management strategy to improve the operational reliability of a small-scale wind power converter. Theoretical analysis, simulation and frequency conversion experiment are given to verify the effectiveness. And the specific goal of...
Power converters are crucial components of the wind turbine generator system (WTGS), and the reliability of wind power converters is susceptible to power fluctuations of the WTGS. The accurate lifetime estimation of power semiconductors should consider the long-time mission profiles of the WTGS. However, the existing junction temperature calculation methods don't meet the requirement for performance...
This paper proposes a novel control strategy-Coordinated DC Voltage Control (CDVC)-to enhance the AC fault ride through capability of Multi-terminal HVDC system. It is able to keep DC voltage constant and distribute power fast and smoothly, independent on line impedance parameters. Combined with this original control strategy, a series of AC fault ride through methods, including voltage reduction,...
Compared with the conventional buck-boost three-level inverters, the Z-source neutral-point-clamped (NPC) inverters have more simple structure with improved output waveform quality. But the neutral-point potential unbalance problem is still a drawback for their applications. Based on the research of SPWM modulation method and the analysis of the effect of the shoot-through states on the neutral-point...
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