This paper introduces an improved stat-space averaged representation of switching power converters for LED driving taking into consideration the equivalent electrical model of the LED array being driven. This allows for exact prediction of the large-signal behavior of the converter when presented with duty-cycle, load and input voltage disturbances, as well as obtaining the accurate small-signal transfer functions for proper control loop design. Simulation and experimental results are given to validate the state-space model presented, which are then compared to the classical approach to modeling such LED drivers.

This paper proposes an initial study on Visible Light Communication (VLC) system consisting of a 20 W flyback converter operating in Continuous Conduction Mode (CCM) with dimmable capability over the range of 20-80%. The paper uses the VPPM (Variable Pulse Position Modulation) technique for VLC data transmission. This modulation allows the transmission of the bits without modification of the converter duty cycle, ensuring a data transmission that does not affect the current dimming condition. The implemented laboratory prototype features a system efficiency between 85% and 89% over the whole dimming range and a transmission rate of 2.2 kb/s.

As the world transitions toward renewable electrification to reduce CO₂ emissions, remote island electrification remains a challenge. While some islands are grid-connected, many still rely on fossil fuels for electricity generation. Several studies indicate that renewable energy sources, such as wave energy, have the potential to make these islands self-reliant due to their substantial power potential. However, research on the control of power electronics converters for these systems remains limited. This paper proposes isolated grid-forming control for island electrification to address this gap using a wave energy converter and an energy storage system. Resistive loading control is implemented to optimize the power absorption from the generator. The result illustrates the establishment of the required AC voltage and 50 Hz frequency in the island load, ensuring harmonics compliance with the recommended standards. Experiments were conducted to test and validate the operation of different converter controls. The results also demonstrate the converter’s ability to black-start the island load and automatically transition the load current with varying loads in a few milliseconds. Furthermore, the power quality produced by the wave energy converter presents one of its significant challenges. Therefore, the performances of two distinct converter technologies were compared. The performance of the IGBT converter was evaluated against that of the SiC-based converter in terms of power quality. The study demonstrates that the use of SiC enhances power quality across all the tested switching frequencies, achieving the greatest reduction of 78% in current THD and 92% in voltage THD at 25 kHz switching frequency, thereby validating its advantages for wave energy converter applications.

The main purpose of this paper is to analyze the performance of LED luminaries and to analyze the remote management integrated into them. These luminaires come with a remote monitoring system based on ZigBee protocol, and it allows wireless communication using GSM / GPRS, the most used technology around the world provided by mobile network operators. With photometric tests, electrical and performance analysis of the luminaires in according to the standards, this paper aims to study the operation of the whole system in a pragmatic way and to evaluate the actual performance and the possible positive and desired results on the public lighting system.

Salient pole wound field synchronous motors find many industrial applications, thanks to their favorable characteristics: reactive power regulation, stiff mechanical characteristic, and overall outstanding efficiency. Nevertheless, their competitiveness toward the induction motors, especially for medium and small power sizes, depends crucially on their capability to be asynchronously started as well. Regrettably, the asynchronous run-up of a synchronous motor can be sometimes very problematic because of thermal issues, torsional vibrations, and grid voltage disturbances. This article presents an alternative method of starting salient pole wound field synchronous machines by activating the field winding in a special manner, which makes it possible to mitigate the three problems at once. The suggested method is validated through a two-dimensional finite elements simulation and by starting a 60-kVA prototype generator. The requirements for the application of the proposed run-up strategy are critically discussed together with related pros and cons.