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Dr. Hani Vahedi
Chief Scientist, Ossiaco Inc., Montreal, QC, Canada

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Research Keywords & Expertise

0 Power Electronics
0 Power Quality
0 Renewable Energy Conversion
0 Multilevel converter
0 Switching technique

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Renewable Energy Conversion
Switching technique

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Journal article
Published: 10 August 2021 in IEEE Transactions on Industrial Electronics
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Multilevel inverters (MLIs) are widely employed in high power and high voltage applications due to their advantages like better power quality and lower voltage stress across power switches compared to the traditional two-level inverter. However, the utilization of higher number of power semiconductor devices and capacitors results in less reliability. In this regard, a fault-tolerant MLI (FTMLI) with asymmetrical source configuration is developed which can tolerate the open circuit (OC) and short circuit (SC) switch failures (single & multiple switch faults). The proposed topology preserves the output power and balances the capacitor's voltage under pre and post-fault conditions. Further, a new switching scheme is proposed to reduce the ripple content in the capacitor's voltage. Further, under post fault operation uses less number of conducting switches resulting in a better efficiency. The proposed FTMLI generates a higher number of voltage levels with less number of component counts when compared with recently proposed topologies. Moreover, this comparative study reveals the prevalence of the proposed converter in the recent literature. The conducted experimental test proves the effectiveness and fault-tolerant (FT) feature of the proposed topology.

ACS Style

Anilkumar Chappa; Shubhrata Gupta; Lalit Kumar; Krishna Kumar Gupta; Hani Vahedi. Fault-Tolerant Asymmetrical Multilevel Inverter with Preserved Output Power under Post-Fault Operation. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.

AMA Style

Anilkumar Chappa, Shubhrata Gupta, Lalit Kumar, Krishna Kumar Gupta, Hani Vahedi. Fault-Tolerant Asymmetrical Multilevel Inverter with Preserved Output Power under Post-Fault Operation. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Anilkumar Chappa; Shubhrata Gupta; Lalit Kumar; Krishna Kumar Gupta; Hani Vahedi. 2021. "Fault-Tolerant Asymmetrical Multilevel Inverter with Preserved Output Power under Post-Fault Operation." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.

Journal article
Published: 21 July 2021 in Sustainability
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The Crossover Switches Cell (CSC) is a recent Single DC-Source Multilevel Inverter (SDCS-MLI) topology with boosting abilities. In grid-connected PV applications, the CSC should be controlled to inject a sinusoidal current to the grid with low THD% and unity power factor, while balancing the capacitor voltage around its reference. These two objectives can be met through the application of a finite control set model predictive control (FCS-MPC) method. Thus, this paper proposes a design of an optimized FCS-MPC for a 9-level grid-tied CSC inverter. The switching actions are optimized using the redundant switching states. The design is verified through simulations and real-time implementation. The presented results show that the THD% of the grid current is 1.73%, and the capacitor voltage is maintained around its reference with less than 0.5 V mean error. To test the reliability of the control design, different scenarios were applied, including variations in the control reference values as well as the AC grid voltage. The presented results prove the good performance of the designed controller in tracking the reference values and minimizing the steady-state errors.

ACS Style

Alamera Alquennah; Mohamed Trabelsi; Khaled Rayane; Hani Vahedi; Haitham Abu-Rub. Real-Time Implementation of an Optimized Model Predictive Control for a 9-Level CSC Inverter in Grid-Connected Mode. Sustainability 2021, 13, 8119 .

AMA Style

Alamera Alquennah, Mohamed Trabelsi, Khaled Rayane, Hani Vahedi, Haitham Abu-Rub. Real-Time Implementation of an Optimized Model Predictive Control for a 9-Level CSC Inverter in Grid-Connected Mode. Sustainability. 2021; 13 (15):8119.

Chicago/Turabian Style

Alamera Alquennah; Mohamed Trabelsi; Khaled Rayane; Hani Vahedi; Haitham Abu-Rub. 2021. "Real-Time Implementation of an Optimized Model Predictive Control for a 9-Level CSC Inverter in Grid-Connected Mode." Sustainability 13, no. 15: 8119.

Review
Published: 26 January 2021 in IEEE Open Journal of the Industrial Electronics Society
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Having a reduced number of switches and isolated DC sources yet generating a higher number of voltage levels has been always the challenge when selecting the appropriate Multilevel Inverter (MLI) topology. Nowadays, Single-DC-Source Multilevel Inverter (SDCS-MLI) topologies are being considered as more suitable for many power system applications such as Renewable Energy (RE) conversion systems and electrified transportations compared to the Multiple-DC-Source MLIs (MDCS-MLIs). Moreover, increasing the power rating and minimizing the switching frequency while maintaining reasonable power quality using a SDCS-MLI is an important requirement and a persistent challenge for the industry. Thus, this paper presents a general review on available SDCS-MLI topologies and future trends. Existing solutions are discussed and analyzed based on their topologies, number of output voltage levels, number of active/passive components, advantages/limitations, maturity, and industrial applications. Furthermore, recommendations for future research and development are suggested in this paper

ACS Style

Mohamed Trabelsi; Hani Vahedi; Haitham Abu-Rub. Review on Single-DC-Source Multilevel Inverters: Topologies, Challenges, Industrial Applications, and Recommendations. IEEE Open Journal of the Industrial Electronics Society 2021, 2, 112 -127.

AMA Style

Mohamed Trabelsi, Hani Vahedi, Haitham Abu-Rub. Review on Single-DC-Source Multilevel Inverters: Topologies, Challenges, Industrial Applications, and Recommendations. IEEE Open Journal of the Industrial Electronics Society. 2021; 2 (99):112-127.

Chicago/Turabian Style

Mohamed Trabelsi; Hani Vahedi; Haitham Abu-Rub. 2021. "Review on Single-DC-Source Multilevel Inverters: Topologies, Challenges, Industrial Applications, and Recommendations." IEEE Open Journal of the Industrial Electronics Society 2, no. 99: 112-127.

Research article
Published: 09 July 2019 in IET Power Electronics
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This article studies the design and implementation of multi-objective predictive control (MO-PC) of a grid-connected seven-level packed U-cell (PUC7) inverter for minimising the line current total harmonic distortion (THD) and capacitor voltage error simultaneously. The weighting factor method is usually used as a simple method for solving the control problem in the literature. However, there are some difficulties and shortcomings in the calculation of weighting factors. Here, max–min selection strategy with together priority is adopted to reduce these deficiencies and improves the system performance. The switch model of the PUC inverter is derived and then applied in designing the MO-PC for grid-connected applications, where a controlled active or reactive power is injected into the utility. A comparative study among three strategies of weighting factor, fuzzy decision-making and max–min selection is performed to distinguish the proposed method superiority. Experimental results are given to validate the practicality of the applied controller in regulating the line current and capacitor voltage of the grid-connected PUC7 inverter.

ACS Style

Seyed Mehdi Abedi Pahnehkolaei; Hani Vahedi; Alireza Alfi; Kamal Al‐Haddad. Comparative study of multi‐objective finite set predictive control methods with new max–min strategy applied on a seven‐level packed U ‐cell inverter. IET Power Electronics 2019, 12, 2170 -2178.

AMA Style

Seyed Mehdi Abedi Pahnehkolaei, Hani Vahedi, Alireza Alfi, Kamal Al‐Haddad. Comparative study of multi‐objective finite set predictive control methods with new max–min strategy applied on a seven‐level packed U ‐cell inverter. IET Power Electronics. 2019; 12 (9):2170-2178.

Chicago/Turabian Style

Seyed Mehdi Abedi Pahnehkolaei; Hani Vahedi; Alireza Alfi; Kamal Al‐Haddad. 2019. "Comparative study of multi‐objective finite set predictive control methods with new max–min strategy applied on a seven‐level packed U ‐cell inverter." IET Power Electronics 12, no. 9: 2170-2178.

Journal article
Published: 01 March 2019 in Electronics
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In this paper the standalone operation of the modified seven-level Packed U-Cell (MPUC) inverter is presented and analyzed. The MPUC inverter has two DC sources and six switches, which generate seven voltage levels at the output. Compared to cascaded H-bridge and neutral point clamp multilevel inverters, the MPUC inverter generates a higher number of voltage levels using fewer components. The experimental results of the MPUC prototype validate the appropriate operation of the multilevel inverter dealing with various load types including motor, linear, and nonlinear ones. The design considerations, including output AC voltage RMS value, switching frequency, and switch voltage rating, as well as the harmonic analysis of the output voltage waveform, are taken into account to prove the advantages of the introduced multilevel inverter.

ACS Style

Ali Asghar Shojaei; Bahram Najafi; Hani Vahedi. Standalone Operation of Modified Seven-Level Packed U-Cell (MPUC) Single-Phase Inverter. Electronics 2019, 8, 268 .

AMA Style

Ali Asghar Shojaei, Bahram Najafi, Hani Vahedi. Standalone Operation of Modified Seven-Level Packed U-Cell (MPUC) Single-Phase Inverter. Electronics. 2019; 8 (3):268.

Chicago/Turabian Style

Ali Asghar Shojaei; Bahram Najafi; Hani Vahedi. 2019. "Standalone Operation of Modified Seven-Level Packed U-Cell (MPUC) Single-Phase Inverter." Electronics 8, no. 3: 268.

Journal article
Published: 14 February 2019 in IEEE Transactions on Industrial Electronics
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This paper presents the current control design procedure of a single-phase grid-tied five-level packed U-cell inverter (PUC5) with an LCL output filter. The PUC5 inverter is used as an interface of renewable energy sources, such as solar applications. The LCL filter is calculated according to the grid-tied operation and converter ratings. An optimal controller, based on a linear quadratic regulator with integral action, is designed to inject a sinusoidal current with low harmonic distortion at unity power factor. For that design, the PUC5 inverter is modelled in the D – Q frame. The sensorless voltage control is incorporated into the switching technique to balance the PUC5 capacitor voltage and generate a five-level waveform at the output. Experimental tests are performed on a laboratory benchmark to confirm the theoretical design. The results prove the efficiency and accuracy of the adopted control strategy in a steady state and under transients of grid current, grid inductance, ac and dc voltage amplitudes.

ACS Style

Naima Arab; Hani Vahedi; Kamal Al-Haddad. LQR Control of Single-Phase Grid-Tied PUC5 Inverter With LCL Filter. IEEE Transactions on Industrial Electronics 2019, 67, 297 -307.

AMA Style

Naima Arab, Hani Vahedi, Kamal Al-Haddad. LQR Control of Single-Phase Grid-Tied PUC5 Inverter With LCL Filter. IEEE Transactions on Industrial Electronics. 2019; 67 (1):297-307.

Chicago/Turabian Style

Naima Arab; Hani Vahedi; Kamal Al-Haddad. 2019. "LQR Control of Single-Phase Grid-Tied PUC5 Inverter With LCL Filter." IEEE Transactions on Industrial Electronics 67, no. 1: 297-307.

Journal article
Published: 17 January 2019 in IEEE Transactions on Industrial Informatics
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This paper proposes a novel sensor-less switching method based on logic gates for a five-level packed U-cell (PUC5) converter. It comprises only two level-shifted triangular carriers and logic gates. Hence, the number of triangular carriers is halved and the switching states table is eliminated, which cause remarkable reduction in complexity of the proposed modulation method. Moreover, employing the proposed sensor-less switching method leads to decrease in the PUC5 capacitor value by a factor of carrier ratio, fast self-balancing of the PUC5 capacitor voltage, and halving the output LC filter inductor and capacitor values in stand-alone mode, as well as the grid-link inductor value in grid-connected mode. In addition, the PUC5 converter start-up transient time is considerably decreased and the first switching harmonic cluster frequency is doubled, which lead to notable improvement of steady-state and dynamic performances of the PUC5 converter. The proposed sensor-less switching method has been implemented in both stand-alone and grid-connected operating modes of PUC5 converter. Provided simulation and experimental results verify the feasibility and effectiveness of the proposed sensor-less switching method as well as its improved dynamic and steady-state performances in both stand-alone and grid-connected modes.

ACS Style

Mostafa Abarzadeh; Hani Vahedi; Kamal Al-Haddad. Fast Sensor-Less Voltage Balancing and Capacitor Size Reduction in PUC5 Converter Using Novel Modulation Method. IEEE Transactions on Industrial Informatics 2019, 15, 4394 -4406.

AMA Style

Mostafa Abarzadeh, Hani Vahedi, Kamal Al-Haddad. Fast Sensor-Less Voltage Balancing and Capacitor Size Reduction in PUC5 Converter Using Novel Modulation Method. IEEE Transactions on Industrial Informatics. 2019; 15 (8):4394-4406.

Chicago/Turabian Style

Mostafa Abarzadeh; Hani Vahedi; Kamal Al-Haddad. 2019. "Fast Sensor-Less Voltage Balancing and Capacitor Size Reduction in PUC5 Converter Using Novel Modulation Method." IEEE Transactions on Industrial Informatics 15, no. 8: 4394-4406.

Journal article
Published: 01 December 2018 in International Journal of Electrical Power & Energy Systems
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A continuous control set model predictive control (CCS-MPC) is designed for a DC-DC buck converter used in maximum power point tracking (MPPT) of a photovoltaic (PV) module. A modified incremental conductance (m-INC) algorithm is used for MPP determination as a reference signal for CCS-MPC. The small-signal model of the PV system is adaptively obtained around MPP through linearization of its average model. The predictive control is designed and applied to a PV system using an online optimization of the cost function including the discretized present and future states. The performance of the proposed m-INC CCS-MPC is evaluated by simulation study that indicates better performance in terms of transient and disturbance rejection compared to conventional PI controller. Finally, the applicability of the proposed m-INC CCS-MPC strategy is assessed with outdoor experimental results and the associated practical advantages against finite control set (FCS) MPC are discussed.

ACS Style

Ahmad Dehghanzadeh; Gholamreza Farahani; Hani Vahedi; Kamal Al-Haddad. Model predictive control design for DC-DC converters applied to a photovoltaic system. International Journal of Electrical Power & Energy Systems 2018, 103, 537 -544.

AMA Style

Ahmad Dehghanzadeh, Gholamreza Farahani, Hani Vahedi, Kamal Al-Haddad. Model predictive control design for DC-DC converters applied to a photovoltaic system. International Journal of Electrical Power & Energy Systems. 2018; 103 ():537-544.

Chicago/Turabian Style

Ahmad Dehghanzadeh; Gholamreza Farahani; Hani Vahedi; Kamal Al-Haddad. 2018. "Model predictive control design for DC-DC converters applied to a photovoltaic system." International Journal of Electrical Power & Energy Systems 103, no. : 537-544.

Journal article
Published: 16 July 2018 in IEEE Transactions on Industrial Electronics
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In this paper a fixed switching frequency Model Predictive Current Controller is designed and implemented on a sensor-less five-level Packed U-Cell (PUC5) inverter interfacing the utility. The predictive control methodology is based on a voltage vector generation technique for the cost function optimization by nullifying its derivative. The aim of the controller is to allow a fixed-frequency operation with no iterations while operating as a utility line current regulator. A pulse width modulator based on employing PUC5 redundant switching states takes the action of fixing the PUC5 auxiliary dc bus capacitor voltage to its desired level with no necessity of a regulator; the overall technique reduces system complexity with less sensors and no loops in the predictive algorithm making it suitable for industrial applications. System discrete model is developed and experimental results verify the performance of the designed controller in making a fast response in regulating the grid current and balancing the capacitor voltage.

ACS Style

Fadia Sebaaly; Hani Vahedi; Hadi Youssef Kanaan; Kamal Al-Haddad. Experimental Design of Fixed Switching Frequency Model Predictive Control for Sensorless Five-Level Packed U-Cell Inverter. IEEE Transactions on Industrial Electronics 2018, 66, 3427 -3434.

AMA Style

Fadia Sebaaly, Hani Vahedi, Hadi Youssef Kanaan, Kamal Al-Haddad. Experimental Design of Fixed Switching Frequency Model Predictive Control for Sensorless Five-Level Packed U-Cell Inverter. IEEE Transactions on Industrial Electronics. 2018; 66 (5):3427-3434.

Chicago/Turabian Style

Fadia Sebaaly; Hani Vahedi; Hadi Youssef Kanaan; Kamal Al-Haddad. 2018. "Experimental Design of Fixed Switching Frequency Model Predictive Control for Sensorless Five-Level Packed U-Cell Inverter." IEEE Transactions on Industrial Electronics 66, no. 5: 3427-3434.

Journal article
Published: 27 April 2018 in IEEE Transactions on Industry Applications
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This paper proposes new angles constraint for Selective Harmonic Elimination (SHE)-PWM utilized in single-phase inverter applications. The proposed angles constraint naturally eliminates all triplen harmonics whereas they were conventionally appeared in all single-phase output voltages. The harmonic amplitude formula is developed based on the obtained angles constraint and then modified single-phase SHE equations are defined to eliminate only specified low non-triplen harmonics. Therefore, more harmonics would be eliminated with same switching frequency in modified SHE-PWM. Five-level voltage waveform has been opted to implement the introduced method; but, it can be applied on all multilevel voltage waveforms such as seven-level with even number of angles. Unlike conventional SHE technique, voltage THD is analyzable in modified SHE to find optimum values for switching angles in order to control non-eliminated harmonic amplitudes and minimize THD. Moreover, the cancellation of triplen harmonics empowers single-phase inverter to supply nonlinear loads beside linear ones. Some experimental tests are accomplished using a single-phase 5-level Modified Packed U-Cell (MPUC) inverter. Results are discussed to prove the excellent performance of single-phase MPUC inverter under both normal and harmonic loads and accurate elimination of determined triplen and non-triplen harmonics by applying the presented angles constraint.

ACS Style

Mohammad Sharifzadeh; Hani Vahedi; Kamal Al-Haddad. New Constraint in SHE-PWM for Single-Phase Inverter Applications. IEEE Transactions on Industry Applications 2018, 54, 4554 -4562.

AMA Style

Mohammad Sharifzadeh, Hani Vahedi, Kamal Al-Haddad. New Constraint in SHE-PWM for Single-Phase Inverter Applications. IEEE Transactions on Industry Applications. 2018; 54 (5):4554-4562.

Chicago/Turabian Style

Mohammad Sharifzadeh; Hani Vahedi; Kamal Al-Haddad. 2018. "New Constraint in SHE-PWM for Single-Phase Inverter Applications." IEEE Transactions on Industry Applications 54, no. 5: 4554-4562.

Journal article
Published: 02 April 2018 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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This paper proposes a modified conation of single-phase pack U-cell (PUC) multilevel inverter in which the output voltage has higher amplitude than the maximum dc link value used in the topology as a boost operation. The introduced inverter generates seven-level ac voltage at the output using two dc links and six semiconductor switches. Comparing to cascaded H-bridge and neutral point clamp multilevel inverters, the introduced multilevel inverter produces more voltage levels using less components. The proposed inverter is used in photovoltaic (PV) system where the green power comes from two separate PV panels connected to the dc links through dc-dc converters to draw the maximum power. Due to boost operation of this inverter, two different PV panels can combine and send their powers to the grid. Simulations and experimental tests are conducted to investigate the good dynamic performance of the inverter in grid-connected PV system.

ACS Style

Hani Vahedi; Mohammad Sharifzadeh; Kamal Al-Haddad. Modified Seven-Level Pack U-Cell Inverter for Photovoltaic Applications. IEEE Journal of Emerging and Selected Topics in Power Electronics 2018, 6, 1508 -1516.

AMA Style

Hani Vahedi, Mohammad Sharifzadeh, Kamal Al-Haddad. Modified Seven-Level Pack U-Cell Inverter for Photovoltaic Applications. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2018; 6 (3):1508-1516.

Chicago/Turabian Style

Hani Vahedi; Mohammad Sharifzadeh; Kamal Al-Haddad. 2018. "Modified Seven-Level Pack U-Cell Inverter for Photovoltaic Applications." IEEE Journal of Emerging and Selected Topics in Power Electronics 6, no. 3: 1508-1516.

Journal article
Published: 05 March 2018 in IEEE Transactions on Power Electronics
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In this paper, a modified selective harmonic mitigation pulse amplitude modulation (SHM-PAM) is presented to be capable of canceling all triplen harmonic orders and suitable for single-phase application of five-level type of voltage source inverters. To this end, a new constraint is established for the two switching angles (α 1 , α 2 ) to derive the new formula for the harmonics' amplitude, which results in self-elimination of all triplen harmonics (e.g., 3rd, 9th, 15th, ...). The fifth and seventh harmonic orders are mitigated through normal operation of the proposed SHM-PAM technique. It is also shown that the proposed technique is extendable to other multilevel voltage waveforms and a flowchart of self-elimination of all triplen harmonics has been presented. Mathematical analysis supported by experimental investigations show the desired performance of the proposed SHM-PAM algorithm on a two-cell single-phase cascaded H-bridge inverter as a typical five-level configuration in dealing with linear and nonlinear loads. Then, it is demonstrated that the maximum number of harmonic orders would be controlled with the minimum number of available angles in a low switching frequency voltage waveform.

ACS Style

Mohammad Sharifzadeh; Hani Vahedi; Ramon Portillo; Leopoldo Garcia Franquelo; Kamal Al-Haddad. Selective Harmonic Mitigation Based Self-Elimination of Triplen Harmonics for Single-Phase Five-Level Inverters. IEEE Transactions on Power Electronics 2018, 34, 86 -96.

AMA Style

Mohammad Sharifzadeh, Hani Vahedi, Ramon Portillo, Leopoldo Garcia Franquelo, Kamal Al-Haddad. Selective Harmonic Mitigation Based Self-Elimination of Triplen Harmonics for Single-Phase Five-Level Inverters. IEEE Transactions on Power Electronics. 2018; 34 (1):86-96.

Chicago/Turabian Style

Mohammad Sharifzadeh; Hani Vahedi; Ramon Portillo; Leopoldo Garcia Franquelo; Kamal Al-Haddad. 2018. "Selective Harmonic Mitigation Based Self-Elimination of Triplen Harmonics for Single-Phase Five-Level Inverters." IEEE Transactions on Power Electronics 34, no. 1: 86-96.

Journal article
Published: 18 December 2017 in IEEE Transactions on Industrial Electronics
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In this paper, a novel controller based on the predictive technique has been introduced for a neutral-point-clamped grid-tied inverter. The aim of the developed method is to achieve a constant system switching frequency operation. The proposed method generates the voltage vector by nullifying the derivative of the cost function of a finite-set model predictive controller. The developed controller takes in action of injecting the desired grid current while a closed-loop space vector modulator regulates the capacitors voltages. A comparative study with a similar model predictive algorithm with constant switching frequency (MPC-CSF) is introduced and discussed in terms of computational complexity. Experimental results are provided to verify the performance and robustness of the new method over MPC-CSF with its ability of injecting a very low total harmonic distortion to the grid with almost unity power factor during normal and transient operations.

ACS Style

Fadia Sebaaly; Hani Vahedi; Hadi Y. Kanaan; Kamal Al-Haddad. Novel Current Controller Based on MPC With Fixed Switching Frequency Operation for a Grid-Tied Inverter. IEEE Transactions on Industrial Electronics 2017, 65, 6198 -6205.

AMA Style

Fadia Sebaaly, Hani Vahedi, Hadi Y. Kanaan, Kamal Al-Haddad. Novel Current Controller Based on MPC With Fixed Switching Frequency Operation for a Grid-Tied Inverter. IEEE Transactions on Industrial Electronics. 2017; 65 (8):6198-6205.

Chicago/Turabian Style

Fadia Sebaaly; Hani Vahedi; Hadi Y. Kanaan; Kamal Al-Haddad. 2017. "Novel Current Controller Based on MPC With Fixed Switching Frequency Operation for a Grid-Tied Inverter." IEEE Transactions on Industrial Electronics 65, no. 8: 6198-6205.

Journal article
Published: 14 July 2017 in IEEE Transactions on Power Electronics
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In this letter, the five-level packed U-cell (PUC5) inverter is reconfigured with two identical dc links operating as an active power filter (APF). Generally, the peak voltage of an APF should be greater than the ac voltage at the point-of-common coupling (PCC) to ensure the boost operation of the converter in order to inject harmonic current into the system effectively; therefore, full compensation can be obtained. The proposed modified PUC5 (MPUC5) converter has two equally regulated separated dc links, which can operate at no load condition useful for APF application. Those divided dc terminals amplitudes are added at the input of the MPUC5 converter to generate a boosted voltage that is higher than the PCC voltage. Consequently, the reduced dc-links voltages are achieved since they do not individually need to be higher than the PCC voltage due to the mentioned fact that their summation has to be higher than PCC voltage. The voltage balancing unit is integrated into the modulation technique to be decoupled from the APF controller. The proposed APF is practically tested to validate its good dynamic performance in harmonic elimination, ac-side power factor correction, reactive power compensation, and power quality improvement.

ACS Style

Hani Vahedi; Ali Asghar Shojaei; Louis-A. Dessaint; Kamal Al-Haddad. Reduced DC-Link Voltage Active Power Filter Using Modified PUC5 Converter. IEEE Transactions on Power Electronics 2017, 33, 943 -947.

AMA Style

Hani Vahedi, Ali Asghar Shojaei, Louis-A. Dessaint, Kamal Al-Haddad. Reduced DC-Link Voltage Active Power Filter Using Modified PUC5 Converter. IEEE Transactions on Power Electronics. 2017; 33 (2):943-947.

Chicago/Turabian Style

Hani Vahedi; Ali Asghar Shojaei; Louis-A. Dessaint; Kamal Al-Haddad. 2017. "Reduced DC-Link Voltage Active Power Filter Using Modified PUC5 Converter." IEEE Transactions on Power Electronics 33, no. 2: 943-947.

Research articles
Published: 01 August 2016 in IET Power Electronics
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In this study, a real-time controller implementing closed-loop space vector modulation (CLSVM) technique combined with DC bus voltage control is applied on a three-phase four-wire three-level neutral point clamped (NPC) inverter to be used in sustainable energy conversion systems with higher efficiency and lower switching frequency than conventional two-level inverters. The redundant switching states of CLSVM is dictated based on the voltage feedback obtained from DC link in order to constantly balance the DC bus capacitors voltages under various load conditions. The main feature of this technique is the use of only voltage sensors for balancing the DC capacitors voltages in four-wire system which makes the algorithm act fast, while permitting reduction of DC bus capacitors voltage ripple significantly and therefore smaller capacitors are used. The NPC inverter has been modelled and effects of redundant switching states have been analysed mathematically on DC capacitors voltages. Comprehensive experimental tests are conducted on a four-wire three-leg NPC operating as uninterruptible power supply application for sustainable energy conversion to validate the designed approach and the dynamic response under various load conditions including linear, non-linear, balanced, unbalanced and motor loads.

ACS Style

Hani Vahedi; Philippe‐Alexandre Labbe; Kamal Al‐Haddad. Balancing three‐level neutral point clamped inverter DC bus using closed‐loop space vector modulation: real‐time implementation and investigation. IET Power Electronics 2016, 9, 2076 -2084.

AMA Style

Hani Vahedi, Philippe‐Alexandre Labbe, Kamal Al‐Haddad. Balancing three‐level neutral point clamped inverter DC bus using closed‐loop space vector modulation: real‐time implementation and investigation. IET Power Electronics. 2016; 9 (10):2076-2084.

Chicago/Turabian Style

Hani Vahedi; Philippe‐Alexandre Labbe; Kamal Al‐Haddad. 2016. "Balancing three‐level neutral point clamped inverter DC bus using closed‐loop space vector modulation: real‐time implementation and investigation." IET Power Electronics 9, no. 10: 2076-2084.

Journal article
Published: 29 June 2016 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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In this paper, a fixed-frequency pulsewidth modulation (PWM) based on sliding-mode current controller is designed and applied to a utility interface three-phase/wire/level neutral-point-clamped inverter. The proposed design methodology of the sliding-mode control is based on a constant switching frequency operation and on Gao's reaching law that allows chattering compensation. The aim of the controller is to inject a controlled active power from renewable energy sources into the grid while controlling the power factor and minimizing supply current harmonics. Moreover, the dc-link voltages across the split capacitors are controlled with a simple proportional-integral (PI) regulator. Experimental results show the advantages of the proposed control algorithm in terms of fast dynamic response, low voltage ripple on the dc bus, low current Total Harmonic Distortion, and robustness toward external perturbations from the dc and ac sides; moreover, a comparison with a PWM-PI current controller is presented.

ACS Style

Fadia Sebaaly; Hani Vahedi; Hadi Y. Kanaan; Nazih Moubayed; Kamal Al-Haddad. Sliding Mode Fixed Frequency Current Controller Design for Grid-Connected NPC Inverter. IEEE Journal of Emerging and Selected Topics in Power Electronics 2016, 4, 1397 -1405.

AMA Style

Fadia Sebaaly, Hani Vahedi, Hadi Y. Kanaan, Nazih Moubayed, Kamal Al-Haddad. Sliding Mode Fixed Frequency Current Controller Design for Grid-Connected NPC Inverter. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2016; 4 (4):1397-1405.

Chicago/Turabian Style

Fadia Sebaaly; Hani Vahedi; Hadi Y. Kanaan; Nazih Moubayed; Kamal Al-Haddad. 2016. "Sliding Mode Fixed Frequency Current Controller Design for Grid-Connected NPC Inverter." IEEE Journal of Emerging and Selected Topics in Power Electronics 4, no. 4: 1397-1405.

Journal article
Published: 07 June 2016 in IEEE Transactions on Industrial Informatics
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Presents corrections to various diagrams and figures in the paper, "Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes," (Vahedi, H., et al), IEEE Trans. Ind. Informat., vol. 12, no. 1, pp. 361-370, 2016.

ACS Style

Hani Vahedi; Philippe-Alexandre Labbe; Kamal Al-Haddad. Corrections to “Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes” [Feb 16 361-370]. IEEE Transactions on Industrial Informatics 2016, 12, 1298 -1298.

AMA Style

Hani Vahedi, Philippe-Alexandre Labbe, Kamal Al-Haddad. Corrections to “Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes” [Feb 16 361-370]. IEEE Transactions on Industrial Informatics. 2016; 12 (4):1298-1298.

Chicago/Turabian Style

Hani Vahedi; Philippe-Alexandre Labbe; Kamal Al-Haddad. 2016. "Corrections to “Sensor-Less Five-Level Packed U-Cell (PUC5) Inverter Operating in Stand-Alone and Grid-Connected Modes” [Feb 16 361-370]." IEEE Transactions on Industrial Informatics 12, no. 4: 1298-1298.

Journal article
Published: 15 October 2015 in IEEE Transactions on Industrial Informatics
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In this paper, a new mode of operation has been introduced for packed U-cell (PUC) inverter. A sensor-less voltage control based on redundant switching states is designed for the five-level packed U-cell (PUC5) inverter, which is integrated into switching process. The sensor-less voltage control is in charge of fixing the dc capacitor voltage at half of the dc source value results in generating symmetric five-level voltage waveform at the output with low harmonic distortion. The sensor-less voltage regulator reduces the complexity of the control system, which makes the proposed converter appealing for industrial applications. An external current controller has been applied for grid-connected application of the introduced sensor-less PUC5 to inject active and reactive power from inverter to the grid with arbitrary power factor, while the PUC auxiliary dc bus is regulated only by sensor-less controller combined with new switching pattern. Experimental results obtained in stand-alone and grid-connected operating modes of proposed PUC5 inverter prove the fast response and good dynamic performance of the designed sensor-less voltage control in balancing the dc capacitor voltage at desired level.

ACS Style

Hani Vahedi; Philippe-Alexandre Labbe; Kamal Al-Haddad. Sensor-Less Five-Level Packed U-Cell Inverter Operating in Stand-Alone and Grid-Connected Modes. IEEE Transactions on Industrial Informatics 2015, 12, 1 -1.

AMA Style

Hani Vahedi, Philippe-Alexandre Labbe, Kamal Al-Haddad. Sensor-Less Five-Level Packed U-Cell Inverter Operating in Stand-Alone and Grid-Connected Modes. IEEE Transactions on Industrial Informatics. 2015; 12 (1):1-1.

Chicago/Turabian Style

Hani Vahedi; Philippe-Alexandre Labbe; Kamal Al-Haddad. 2015. "Sensor-Less Five-Level Packed U-Cell Inverter Operating in Stand-Alone and Grid-Connected Modes." IEEE Transactions on Industrial Informatics 12, no. 1: 1-1.

Review article
Published: 28 June 2011 in Advances in Power Electronics
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Hysteresis Current Control (HCC) is widely used due to its simplicity in implementation, fast and accurate response. However, the main issue is its variable switching frequency which leads to extraswitching losses and injecting high-frequency harmonics into the system current. To solve this problem, adaptive hysteresis current control (AHCC) has been introduced which produces hysteresis bandwidth which instantaneously results in smoother and constant switching frequency. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the adaptive hysteresis current control is explained that leads to fixing the switching frequency and reducing the high-frequency components in source current waveform. Due to these advantages of AHCC, the switching frequency and switching losses will be diminished appropriately. Some simulations are done in MATLAB/Simulink. The Fourier Transform and THD results of source and load currents and the instantaneous switching frequency diagram are discussed to prove the efficiency of this method. The Fourier Transform and THD results of source and load currents are discussed to prove the validity of this method.

ACS Style

Hani Vahedi; Abdolreza Sheikholeslami; Mohammad Tavakoli Bina; Mahmood Vahedi. Review and Simulation of Fixed and Adaptive Hysteresis Current Control Considering Switching Losses and High-Frequency Harmonics. Advances in Power Electronics 2011, 2011, 1 -6.

AMA Style

Hani Vahedi, Abdolreza Sheikholeslami, Mohammad Tavakoli Bina, Mahmood Vahedi. Review and Simulation of Fixed and Adaptive Hysteresis Current Control Considering Switching Losses and High-Frequency Harmonics. Advances in Power Electronics. 2011; 2011 ():1-6.

Chicago/Turabian Style

Hani Vahedi; Abdolreza Sheikholeslami; Mohammad Tavakoli Bina; Mahmood Vahedi. 2011. "Review and Simulation of Fixed and Adaptive Hysteresis Current Control Considering Switching Losses and High-Frequency Harmonics." Advances in Power Electronics 2011, no. : 1-6.