5 results on '"Ruderman, Alex"'
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2. Three-Phase Three-Level Flying Capacitor PV Generation System with an Embedded Ripple Correlation Control MPPT Algorithm
- Author
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Gabriele Grandi, Mattia Ricco, Alex Ruderman, Manel Hammami, Hammami, Manel, Ricco, Mattia, Ruderman, Alex, and Grandi, Gabriele
- Subjects
Maximum power principle ,Computer Networks and Communications ,Computer science ,Ripple ,Irradiance ,lcsh:TK7800-8360 ,02 engineering and technology ,Maximum power point tracking ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,low-frequency harmonics ,three-level flying capacitor inverter ,three-phase inverter ,020208 electrical & electronic engineering ,Photovoltaic system ,lcsh:Electronics ,020206 networking & telecommunications ,maximum power point (MPP) ,Low-frequency harmonic ,Computer Networks and Communication ,Three-phase ,Control and Systems Engineering ,Hardware and Architecture ,Harmonics ,Signal Processing ,Harmonic ,Inverter ,Photovoltaic ,Pulse-width modulation ,ripple correlation control (RCC) ,Voltage - Abstract
This paper presents the implementation of a maximum power point tracking (MPPT) algorithm in a multilevel three-phase photovoltaic (PV) system using the ripple correlation control (RCC) method. Basically, RCC adopts the inherent oscillations of PV current and voltage as perturbation, and it has been predominantly used for single-phase configurations, where the oscillations correspond to the 2nd order harmonics. The implementation of an RCC-MPPT algorithm in a three-phase system has not been presented yet in the literature. In this paper, the considered three-phase three-level converter is a three-level flying capacitor (FC) inverter. The proffered RCC method uses the 3rd harmonic components of PV current and voltage for the estimation of the voltage derivative of the power dPpv/dVpv (or current, dIpv/dVpv), compelling the PV array to operate at or very close to the maximum power point. The analysis and calculation of the low-frequency PV current and voltage ripple harmonic components in the three-phase flying capacitor inverter is presented first, with reference to centered carrier-based three-level PWM. The whole grid-connected PV generation scheme has been implemented by MATLAB/Simulink, and detailed numerical simulations verified the effectiveness of the control method in both steady-state and dynamic conditions, emulating different sun irradiance transients.
- Published
- 2019
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3. On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources
- Author
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Zhansen Akhmetov, Alex Ruderman, Gabriele Grandi, Manel Hammami, Akhmetov, Zhansen, Hammami, Manel, Grandi, Gabriele, and Ruderman, Alex
- Subjects
multilevel inverters ,total harmonic distortion ,level-shifted PWM ,phase-shifted PWM ,Control and Optimization ,Computer science ,Energy Engineering and Power Technology ,lcsh:Technology ,Energy storage ,Multilevel inverter ,Control theory ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Total harmonic distortion ,Renewable Energy, Sustainability and the Environment ,business.industry ,lcsh:T ,Photovoltaic system ,H bridge ,Power (physics) ,Three-phase ,Cascade ,Distributed generation ,Inverter ,business ,Pulse-width modulation ,Energy (miscellaneous) - Abstract
Cascade H-bridge (CHB) inverter is an attractive choice for integration of DC sources of different nature, e.g., for distributed generation with energy storage, photovoltaic generation, etc. In general, non-equal DC voltage sources can affect the total harmonic distortion (THD) of the CHB by introducing undesirable low-frequency subharmonics. This paper investigates different level-shifted (LS) and phase-shifted (PS) pulse width modulation (PWM) strategies for single- and three-phase cascade H-bridge inverters with non-equal DC sources from the load current THD minimization perspective. The best current quality is provided by LS PWM, as reported in the literature. The paper provides a simple time domain explanation of LS PWM superiority. However, PS PWM may be a preferable choice for practical applications due to fair power and loss sharing across individual H-bridges. The paper explains how to obtain the best current quality by PS PWM carriers’ order arrangement (DC sources switching sequence selection).
- Published
- 2019
4. Time-Domain Minimization of Voltage and Current Total Harmonic Distortion for a Single-Phase Multilevel Inverter with a Staircase Modulation
- Author
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Alex Ruderman, Gabriele Grandi, Milan Srndovic, Yakov Lvovich Familiant, Srndovic, Milan, Familiant, Yakov L., Grandi, Gabriele, and Ruderman, Alex
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Control and Optimization ,staircase modulation ,multilevel inverter ,020209 energy ,Modulation index ,Energy Engineering and Power Technology ,02 engineering and technology ,lcsh:Technology ,optimization ,total harmonic distortion (THD) ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Hardware_INTEGRATEDCIRCUITS ,Time domain ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Mathematics ,Total harmonic distortion ,Renewable Energy, Sustainability and the Environment ,lcsh:T ,Computer Science (all) ,020208 electrical & electronic engineering ,THD analyzer ,Frequency domain ,Harmonics ,Inverter ,Energy (miscellaneous) ,Voltage - Abstract
This paper presents the optimization technique for minimizing the voltage and current total harmonic distortion (THD) in a single-phase multilevel inverter controlled by staircase modulation. The previously reported research generally considered the optimal THD problem in the frequency domain, taking into account a limited harmonic number. The novelty of the suggested approach is that voltage and current minimal THD problems are being formulated in the time domain as constrained optimization ones, making it possible to determine the optimal switching angles. In this way, all switching harmonics can be considered. The target function expression becomes very compact and existing efficient solvers for this kind of optimization problems can find a solution in negligible processor time. Current THD is understood as voltage frequency weighted THD that assumes pure inductive load-this approximation is practically accurate for inductively dominant RL-loads. In this study, the optimal switching angles and respective minimal THD values were obtained for different inverter level counts and overall fundamental voltage magnitude (modulation index) dynamic range. Developments are easily modified to cover multilevel inverter grid-connected applications. The results have been verified by experimental tests.
- Published
- 2016
5. Asymptotic time domain evaluation of a single-phase multilevel PWM inverter current quality
- Author
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Boris Reznikov, Yakov Lvovich Familiant, Bexultan Rakhim, Alex Ruderman, Gabriele Grandi, Milan Srndovic, Reznikov, Bori, Srndovic, Milan, Grandi, Gabriele, Rakhim, Bexultan, Familiant, Yakov L., and Ruderman, Alex
- Subjects
Inductance ,Total harmonic distortion ,Control theory ,Frequency domain ,Harmonic ,Modulation index ,Inverter ,Time domain ,Harmonic distorsion, single-phase inverters, multilevel inverters ,Pulse-width modulation ,Mathematics - Abstract
This paper addresses theoretical calculation of a single-phase multilevel PWM inverter current Total Harmonic Distortion (THD). Analytical approach introduced in late 1980s for a 2-level inverter is generalized for an arbitrary level count for a single-phase inverter. Though the obtained closed-form piece-wise analytical solutions assume (infinitely) large ratio of switching and fundamental frequencies and pure inductive load, they are practically very accurate for the ratios of (apparent) switching and fundamental frequencies larger than 25-30 and inductance dominated loads. Along with strict mathematical solutions suggested are simple accurate Bessel function approximation and hyperbolic average trend one. The formulas clearly reveal a single-phase PWM inverter current THD dependence on modulation index for an arbitrary voltage level count and are easily modified to cover grid-connected cases.
- Published
- 2015
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