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28 results on '"Adabi, M. Ebrahim"'

1. Direct Participation of Dynamic Virtual Power Plants in Secondary Frequency Control

Author

Adabi, M. Ebrahim and Marinescu, Bogdan

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

This paper proposes a novel control strategy in which Renewable Energy Sources (RES) considered in a new Dynamic Virtual Power Plant (DVPP) concept directly participate to Secondary Frequency Control (SFC). This allows full participation of these generators to SFC, i.e., in the same manner as classic synchronous generators by fulfilling identical specifications from both control and contractual points of view. An internal real-time redispatch has been proposed to account in DVPP in order to determine the amount of active power injection by each RES unit for provision of frequency support in secondary level. The whole control scheme is designed to take into account both rapid and slow dynamics of modern power systems which contain both classic synchronous generators and rapid power electronics for renawable energy sources in which DVPP is supposed to be inserted. The performance of secondary frequency control strategy has been validated through simulation studies on a two-area benchmark with mixed wind power plants and classic synchronous generators. This work is part of the H2020 POSYTYF project (https://posytyf-h2020.eu/).

Published
2022

22. A Novel Step-Up Single Source Multilevel Inverter

Author

Saeedian, Meysam, Adabi, M. Ebrahim, Hosseini, Seyyed Mehdi, Adabi, Jafar, Pouresmaeil, Edris, Department of Electrical Engineering and Automation, Polytechnic University of Catalonia, Babol Noshirvani University of Technology, Aalto-yliopisto, and Aalto University

Subjects
Voltage step-up, Phase disposition pulse width modulation, Hardware_PERFORMANCEANDRELIABILITY, Capacitors, Efficiency, High-voltage techniques, Inverters, Power supplies, Topology, Integrated circuit modeling, Switched-capacitor technique, DC-AC power conversion, Hardware_INTEGRATEDCIRCUITS, Single source multilevel converter, Switches
Abstract

This paper presents a novel step-up DC to AC converter with only one power supply. These types of converters are suitable for renewable and sustainable energy applications with low input DC sources. The proposed topology has the ability of self-voltage balancing and does not apply end side H-bridge to produce a bipolar staircase waveform. Consequently, switching losses and voltage stress of semiconductor components are reduced to a great extent. A small DC voltage source can be used to achieve a high voltage high quality AC waveform through switching the pre-charged capacitors in series and in parallel. Circuit configuration and its operation principle, capacitors’ charging process, thermal model, capacitances and losses calculations are discussed in details. Moreover, the comparison of the proposed circuit with the other single source multilevel converters shows that the proposed topology reduces the number of circuit elements. Finally, a laboratory9-level prototype is built to verify the theoretical analyses and feasibility of the proposed topology. The experimental results show that the converter efficiency at 1 KW output power is 92.75%.

Published
2019

27. A Hysteresis Current Control Strategy for Common-Mode Voltage Reduction in AC Drive Systems.

Author

Adabi, M. Ebrahim and Vahedi, A.

Subjects
HYSTERESIS, ELECTRIC currents, ELECTRIC noise, CONTROL theory (Engineering), COMPARATIVE studies, SWITCHING theory, SIMULATION methods & models, ELECTRIC inverters
Abstract

This paper presents a current control strategy to reduce the maximum common mode voltage levels of three-phase two-level inverters in adjustable speed drives application. Any reduction of the common mode voltage leads to a decrement of the high frequency related issues of AC drives such as leakage current, EMI noises, shaft voltage and motor bearing damages. A comparative study with other famous hysteresis switching strategies shows that proposed method decreases the switching frequency. Also, a three-level inverter, has seven different values of common mode voltages. Elimination of switching vectors which leads to maximum common mode voltage levels from the switching algorithm is the best option in controlling common mode voltage. In this structure, the quality of the current waveform increases due to variety of switching options. Mathematical analyses have been verified through Simulations to investigate the presented method. [ABSTRACT FROM AUTHOR]

Published
2011

28. An Asymmetrical Step-Up Multilevel Inverter Based on Switched-Capacitor Network.

Author

Taghvaie, Amir, Alijani, Ahmad, Adabi, M. Ebrahim, Rezanejad, Mohammad, Adabi, Jafar, Rouzbehi, Kumars, and Pouresmaeil, Edris

Abstract

This paper presents a transformerless step-up multilevel inverter based on a switched-capacitor structure. One of the main contributions of the proposed topology is replacing the separated DC voltage source with capacitors which are charged at predetermined time intervals. Therefore, a high-level staircase voltage waveform can be achieved by discharging some of these capacitors on the load. The other contribution of the proposed structure is to eliminate the magnetic elements which traditionally boost the input DC voltage. In addition, asymmetrical or unequal amounts of capacitor voltages create more voltage levels, which enable voltage level increments without increasing the number of semiconductor devices. This paper introduces a self-balanced boost Switched-Capacitors Multilevel Inverter (SCMLI) which is able to create a nearly sinusoidal voltage waveform with a maximum voltage of up to 45 times that of the input voltage DC source. Higher level output voltage levels are also achievable by extending the circuit topology. After determination of the switching angles and selecting the proper switching states for each level, an offline NLC method is used for modulation, which eases the control implementation. Analysis, simulation and experiments are carried out for a 91-level inverter (45 levels for positive and negative voltages and one for zero voltage) are presented. [ABSTRACT FROM AUTHOR]

Published
2019
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