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Power electronics applications have become ubiquitous among electronic products today. As a consequence, a great increase on the demand of professionals by the industry has been observed. This has a direct consequence on the electrical and electronics engineering curricula, as they have to meet the requirements of an industry with an increasing number of products requiring power electronics solutions...
A new asymmetrical hybrid multilevel inverter topology is presented. The new topology improve the number of the output voltage level greatly through cascading two five-level H-bridge cells. A hybrid PWM strategy is proposed for the new topology that the switches of different cells works in different switching frequency to low switching losses. Lastly, an experimental 17-level asymmetrical inverter...
This project has been oriented to the development of an energy system unit for powering tramways during shorts periods of time. The aim of this work is to present the results obtained for a high frequency DC-DC converter which is included in the energy unit. The energy unit will consist on two type of energy storage devices: a battery stack and a supercapacitor stack. A comparison of the simulated...
The power chain of a cable car has to meet special requirements concerning grid coupling and drive concept: On the grid side very low short-circuit power is available and on the drive side the bearable torque ripple is very low. Due to the long cable connections, the use of very line friendly line-side converter topologies and control concepts is a must. The minimization of the torque ripple is the...
Step-up dc-dc converters are being extensively studied due to the diffusion of battery powered, renewable energy, traction systems and electrical power systems applications. Coupled-inductor step-up topology can be efficient when high step-up gains are required. The paper investigates the dependence of the efficiency on design parameters for a bidirectional dc-dc converter. The sliding mode control...
Boost converters are widely used in the low-to-high DC/DC application and power-factor-corrected circuits. Based on the interleaved boost converter with coupled inductors, a converter consisting of four interleaved boost converter cells is proposed in this paper. The boost converter cells can share the input current, so this prototype circuit can be designed to have small input current ripple. And...
In this paper, two control strategies for three-phase series-parallel uninterruptible power supplies are compared. A series-parallel UPS consists of a parallel and a series converter. In this topology, most power required by load is supplied directly from AC line during standby mode. Therefore the overall efficiency is higher than that of a conventional UPS. Traditionally, the control strategy of...
This paper proposes a novel bidirectional AC-AC converter based on the Z-source concept. This converter can provide bidirectional power flow. It has symmetrical circuit structure, and can reduce in-rush and harmonic current, provide larger range of output AC voltage and improve reliability. Simulation results verify the validity of the proposed converter.
This paper proposes a novel ZCT (zero-current-transition) PWM full-bridge DC-DC converter. The proposed converter can achieve ZCS (zero-current- switching) for all the active switches in the entire load ranges, also it realizes soft commutation for the output rectifier diodes. Furthermore, the auxiliary circuit also helps to turn on the main switches softly. Soft-switching operational principle is...
This paper investigates feasible topologies of VSC-HVDC system for interconnecting large-scale off-shore wind farms. The corresponding control strategy is developed for coordination and control of the corresponding VSC-HVDC systems. A case of 5-terminal VSC-HVDC system is developed in MATLAB/ SIMULINK to demonstrate the validity of the proposed scheme. The proposed scheme may enable optimal integration...
This paper proposes an input-paralleled output-paralleled half-bridge converter based on single half-bridge converter, which is very suitable for the low output voltage and large output current application. All modules share a common capacitor-leg, that can reduce the number of main circuitpsilas capacitors and make topology simple. The traits and rules of combination converter are introduced and...
In this paper, a novel five-phase five-level inverter based on H-bridge is proposed. Then, the PWM control strategies of this inverter are researched. As the five-phase five-level inverter has 3125 space voltage vectors, it makes SVPWM algorithm extraordinarily complex and too difficult to implement. So, it is a feasible control scheme to adopt carrier-based PWM method. According to phase-shift SPWM...
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