Browsing by Author "Agelidis, Vassilios"
Now showing items 1-20 of 42
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A modified voltage balancing sorting algorithm for the modular multilevel converter: Evaluation for staircase and phase-disposition PWM
(2014)
Conference report
Restricted access - publisher's policyThis paper introduces a low complexity implementation of the voltage balancing sorting algorithm to reduce the switching frequency of the power devices in modular multilevel converters (MMCs). Two modulation techniques are ... -
A modified voltage balancing sorting algorithm for the modular multilevel converter: Evaluation for staircase and phase-disposition PWM
(2015-08-01)
Article
Open Access -
A three-phase frequency-adaptive phase-locked loop for independent single-phase operation
(2014-12-01)
Article
Restricted access - publisher's policyThis letter proposes a phase-locked loop (PLL) able to operate as an independent single-phase PLL in the context of three-phase systems. Its key advantage is that the extracted information allows the independent control ... -
Active redundant submodule configuration in modular multilevel converters
(2013-09)
Article
Restricted access - publisher's policyThe modular multilevel converter (MMC) is based on the cascaded connection of identical submodules (SMs) enabling additional redundancies. This paper proposes the configuration of the MMC topology with redundant SMs and ... -
Analysis of a voltage balancing technique with reduced switching transitions in a flying capacitor multilevel converter
(2013)
Conference report
Open AccessThis paper reports the analysis of a voltage balancing technique based on optimal switching transitions for a flying capacitor (FC) multilevel converter using phase disposition pulse-width modulation. Since multiple switching ... -
Analysis of voltage balancing limits in modular multilevel converters
(IEEE, 2011)
Conference report
Open AccessThe modular multilevel converter (MMC) is one of the most promising converter topologies for high-voltage applications, especially for high-voltage direct-current (HVDC) transmission systems. One of the most challenging ... -
Capacitor voltage balancing in a three-level-converter-based energy storage system
(2013-10-01)
Article
Restricted access - publisher's policyThis paper discusses a grid-connected energy storage system based on two three-level (3L) converters: a DC-DC one and a neutral-point-clamped inverter. When compared to a system using standard two-level converters, the ... -
Circulating current control and evaluation of carrier dispositions in modular multilevel converters
(2013)
Conference report
Restricted access - publisher's policyThis paper presents two control techniques to minimize the circulating currents of the modular multilevel converter. The control techniques reduce the amplitude of each capacitor voltage ripple. Multicarrier level-shifted ... -
Circulating current injection methods based on instantaneous information for the modular multilevel converter
(Institute of Electrical and Electronics Engineers (IEEE), 2015-02-01)
Article
Open AccessThis paper studies different circulating current references for the modular multilevel converter. The circulating current references are obtained from the instantaneous values of the output current and modulation signal ... -
Closed-Loop discontinuous modulation technique for capacitor voltage ripples and switching losses reduction in modular multilevel converters
(2015-04-15)
Article
Open Access -
Comparison of phase-shifted and level-shifted PWM in the modular multilevel converter
(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference report
Restricted access - publisher's policyThis paper reports a comparison study of different carrier-based PWM techniques applied to the modular multilevel converter. Phase-disposition PWM (PD-PWM) and phase-shifted pulse-width modulation (PS-PWM) with non-interleaving ... -
Control of Circulating Currents in Modular Multilevel Converters Through Redundant Voltage Levels
(2016-11-01)
Article
Open AccessAmong the main control targets in a modular multilevel converter (MMC) is the control of the circulating currents within the phase legs of the topology. This paper presents a controller for the circulating current of the ... -
Control strategy to balance operation of parallel connected legs of modular multilevel converters
(2013)
Conference report
Open AccessConnecting legs of modular multilevel converters (MMCs) in parallel can assist an MMC-based high-voltage direct current (HVDC) to increase its current ratings and hence overall power handling capability. Consequently, each ... -
Current improvement of a grid-connected photovoltaic system under unbalanced voltage conditions
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Restricted access - publisher's policyThis paper discusses the performance of a large-scale grid-connected photovoltaic system (GCPS) under unbalanced voltage sag conditions in the grid. By applying the droop control to address the low-voltage-ride-through ... -
Current-balancing technique for interleaved voltage source inverters with magnetically coupled legs connected in parallel
(Institute of Electrical and Electronics Engineers (IEEE), 2015-03-01)
Article
Open AccessConnecting legs in parallel in a voltage source inverter is a way to increase the output current and, thus, its rated power. The connection can be made using either coupled or uncoupled inductors, and achieving an even ... -
Discontinuous modulation of modular multilevel converters without the need for extra submodules
(2015)
Conference report
Open Access -
Dynamic behaviour of a back-to-back five-level flying capacitor converter with reduced DC bus capacitance
(2012)
Conference report
Restricted access - publisher's policyDue to extensive research, advanced voltage source converter (VSC) such as multilevel and multi-module have been proposed for high power applications. These advanced VSCs must provide secure as well as, intelligent power ... -
Enhanced phase-shifted PWM carrier disposition for interleaved voltage-source inverters
(2014-03-01)
Article
Open AccessThis letter presents a novel implementation of pulse width modulation that improves the quality of the line-to-line output voltages in interleaved multiphase voltage-source inverters (VSIs). In multiphase VSIs with n ... -
Evaluation of DC-link decoupling using electrolytic or polypropylene film capacitors in three-phase grid-connected photovoltaic inverters
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Open AccessThe life expectancy and long term reliability of grid-connected three-phase photovoltaic (PV) inverters can be increased by replacing the conventional electrolytic film capacitors by metallized polypropylene film capacitors. ... -
Initial capacitor charging in grid-connected flying capacitor multilevel converters
(2014-07-01)
Article
Restricted access - publisher's policyThis letter reports a method for the initial charging of capacitors in grid-connected flying capacitor (FC) multilevel converters. A resistor is inserted between each phase of the FC converter and the grid. A voltage ...
