Power semiconductor manufacturers are offering IGBT modules with ever greater power densities. The limit is represented by the maximum power loss that can be dissipated; optimisation criteria are the packaging technology as well as the conduction and switching losses of the semiconductor chips. The high current density of the modules together with high switching speeds place increased demands o...

This article deals with the optimization, expressed as the minimization of the 2 norm of the tracking error, of the regulation transients caused by instantaneous, wide parameter variations occurring in the regulated systems. The parameter-varying regulated system is modeled by a set of discrete-time, linear, time-invariant systems and the regulated system switching law is assumed to be complete...

Photovoltaic (PV) cell-level inverters have recently gained popularity, as they provide individual maximum power point tracking and energy management, minimizing so the mismatch losses, caused by partial-shading, degradation effects cell manufacturing variations in solar modules arrays. In this article, a fully decentralized control scheme, applicable to PV cascaded H-bridge (CHB) configuration...

In this paper, slewing maneuver of a flexible spacecraft with large angle of rotation is considered and assuming structural frequency uncertainties a robust minimum-time optimal control law is developed. Considering typical bang-bang control commands with multiple symmetrical switches, a parameter optimization procedure is introduced to find the control forces/torques. The constrained minimizat...

We investigate the dependence of transmission losses on the choice of a slack bus in high voltage AC transmission networks. We formulate a transmission loss minimization problem in terms of slack variables representing the additional power injection that each generator provides to compensate the transmission losses. We show analytically that for transmission lines having small, homogeneous resi...

The paper introduces the modified UPQC topology with reduced switching losses. UPQC is a versatile custom power device which consists of two inverters connected back to back and deals with both load current and supply voltage imperfections. It can simultaneously perform as shunt and series active power filters. The series part of the UPQC acts as Dynamic Voltage Restorer (DVR). It is used to ma...

The impressive features, both in a design and technical aspect, of the Organic LED (OLED) lighting technology have attracted the interest of the research and commercial world and have recently be in the spotlight of the automotive industries, like the Lighting Department of Audi. Some of the most exciting features of these lights are the flexibility, transparency and the very small thickness. I...

For certain field-effect transistors (FETs) in soft-switching operation, the large-signal behavior of their output capacitance ( ${C}_\text{o}$ ) has shown to deviate considerably from datasheet values. This can have a significant effec...

Triangular-current-mode (TCM) modulation guarantees zero-voltage-switching across the mains cycle in AC-DC power converters, eliminating hard-switching with a minor ≈ 30% penalty conduction losses over conventional continuous current mode (CCM) scheme. TCM-operated however, include wide variation both switching frequency and switched cycle, complicating an analytical description of key operatin...