Browsing by Author "Konstantinou, Georgios"
Now showing items 1-20 of 21
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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 -
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 ... -
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 ... -
Discontinuous modulation of modular multilevel converters without the need for extra submodules
(2015)
Conference report
Open Access -
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 ... -
Generalized PWM-based method for multiphase neutral-point-clamped converters with capacitor voltage balance capability
(2017-06-12)
Article
Open AccessThis paper presents a generalized pulse width modulation (PWM)-based control algorithm for multiphase neutral-point-clamped (NPC) converters. The proposed algorithm provides a zero sequence to be added to the reference ... -
Interleaved operation of three-level neutral point clamped converter legs and reduction of circulating currents under SHE-PWM
(Institute of Electrical and Electronics Engineers (IEEE), 2016-06)
Article
Open AccessInterleaving of voltage-source converter (VSC) legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. However, the interleaved operation results ... -
Interleaved selective harmonic elimination PWM for single-phase rectifiers in traction applications
(2013)
Conference report
Restricted access - publisher's policyInterleaved four-quadrant, single-phase rectifiers are widely used in traction applications as part of an AC-DC-AC conversion system. This paper presents selective harmonic elimination pulse-width modulation (SHE-PWM) ... -
Optimal injection of harmonics in circulating currents of modular multilevel converters for capacitor voltage ripple minimization
(2013)
Conference report
Restricted access - publisher's policyThis paper proposes an algorithm to calculate the optimal amplitude and phase of the harmonic current components that can be injected in the circulating currents of a modular multilevel converter (MMC) to minimize the ... -
Reducing circulating currents in interleaved converter legs under selective harmonic elimination pulse-width modulation
(2015)
Conference report
Open AccessInterleaving of voltage source converter legs enables higher output currents per phase, effectively increasing the power rating without increasing semiconductor ratings. Different switching patterns between the converter ... -
Single-carrier phase-disposition PWM techniques for multiple interleaved voltage-source converter legs
(Institute of Electrical and Electronics Engineers (IEEE), 2017-10-26)
Article
Open AccessInterleaved converter legs are typically modulated with individual carriers per leg and phase-shifted PWM (PS-PWM) as it facilitates current balancing amongst the legs. Phase-disposition PWM (PD-PWM), despite the better ... -
Study and comparison of discontinuous modulation for modular multilevel converters in motor drive applications
(Institute of Electrical and Electronics Engineers (IEEE), 2019-01-01)
Article
Open AccessDiscontinuous modulation applied to modular multilevel converters is an effective method for reducing the capacitor voltage ripples. In this paper, the discontinuous modulation is adapted and used in a motor drive application. ... -
Submodule power losses balancing algorithms for the modular multilevel converter
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Open AccessTolerance and component aging can cause significant differences in the capacitance values of the submodules (SMs) in a modular multilevel converter (MMC). Depending on the modulation technique, capacitance mismatches may ... -
Utilising redundant voltage levels for circulating current control in modular multilevel converters
(2015)
Conference report
Open Access
