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In this paper, a new single-phase seven level inverter with reduced device count is introduced. The structure can boost the input voltage by synthesizing the capacitors’ voltages in predetermined current paths. A single DC voltage source is utilized to generate the output AC staircase waveform, which is facilitated via Nearest Level Control. Self-voltage balancing ability, less number of semiconductor devices, high efficiency and control simplicity are the most significant inherent attributes of the proposed circuit. It is also noticeable that in this configuration neither bulky transformer/inductor nor filters are applied. Power loss calculation and required capacitance of the proposed inverter are investigated and theoretical efficiency of 93.31% was reached. Moreover, the proposed converter operates under various load conditions with lower Total Harmonic Distortion compared to recent topologies. Ultimately, operating principles of the proposed D-Type seven-level Inverter and simulation results in MATLAB SIMULINK environment are validated by experimental ones obtained from the laboratory prototype.
Erfan Azimi; Aliakbar Tavasoli; Hossein Hafezi; Alireza Nateghi. A Dumbbell Type (D-Type) multilevel inverter based on switched capacitor concept. International Journal of Electronics 2021, 1 -17.
AMA StyleErfan Azimi, Aliakbar Tavasoli, Hossein Hafezi, Alireza Nateghi. A Dumbbell Type (D-Type) multilevel inverter based on switched capacitor concept. International Journal of Electronics. 2021; ():1-17.
Chicago/Turabian StyleErfan Azimi; Aliakbar Tavasoli; Hossein Hafezi; Alireza Nateghi. 2021. "A Dumbbell Type (D-Type) multilevel inverter based on switched capacitor concept." International Journal of Electronics , no. : 1-17.
This paper aims to present a novel switched-capacitor multi-level inverter. The presented structure generates a staircase near sinusoidal AC voltage by using a single DC source and a few capacitors to step-up the input voltage. The nearest level control (NLC) strategy is used to control the operation of the converter. These switching states are designed in a way that they always ensure the self-voltage balancing of the capacitors. Low switching frequency, simple control, and inherent bipolar output are some of the advantages of the presented inverter. Compared to other existing topologies, the structure requires fewer circuit elements. Bi-directional power flow ability of the proposed topology, facilitates the operation of the circuit under wide range of load behaviors which makes it applicable in most industries. Besides, a 13-level laboratory prototype is implemented to realize and affirm the efficacy of the MATLAB Simulink model under different load conditions. The simulation and experimental results accredit the appropriate performance of the converter. Finally, a theoretical efficiency of 92.73% is reached.
Erfan Azimi; Aryorad Khodaparast; Mohammad Javad Rostami; Jafar Adabi; M. Ebrahim Adabi; Mohammad Rezanejad; Eduardo M. G. Rodrigues; Edris Pouresmaeil. X-Type Step-Up Multi-Level Inverter with Reduced Component Count Based on Switched-Capacitor Concept. Electronics 2020, 9, 1987 .
AMA StyleErfan Azimi, Aryorad Khodaparast, Mohammad Javad Rostami, Jafar Adabi, M. Ebrahim Adabi, Mohammad Rezanejad, Eduardo M. G. Rodrigues, Edris Pouresmaeil. X-Type Step-Up Multi-Level Inverter with Reduced Component Count Based on Switched-Capacitor Concept. Electronics. 2020; 9 (12):1987.
Chicago/Turabian StyleErfan Azimi; Aryorad Khodaparast; Mohammad Javad Rostami; Jafar Adabi; M. Ebrahim Adabi; Mohammad Rezanejad; Eduardo M. G. Rodrigues; Edris Pouresmaeil. 2020. "X-Type Step-Up Multi-Level Inverter with Reduced Component Count Based on Switched-Capacitor Concept." Electronics 9, no. 12: 1987.
In this paper, a step-up seven-level inverter supplied by a single DC source suitable for renewable energy application is presented. Forming the desired output is realized by charging capacitors and synthesizing them based on switched-capacitor concept. This structure is praised for the ability of sensor-less voltage balancing of the capacitors, reducing control complexity to produce a bipolar staircase waveform. It also benefits from regenerative performance, avoiding unwanted capacitors overvoltage. Phase Disposition Pulse Width Modulation technique is utilized to control the circuit operation. Furthermore, a comparison with other recent topologies reveals that losses, number of semiconductor devices, and gate driver circuits are reduced. Theoretical analysis is verified through a laboratory prototype implementation. Experimental results under various types of loads approve the performance of the proposed inverter and validity of the design. Finally, maximum experimental efficiency of 94.3% (115 V, 250 W load) was reached.
Aryorad Khodaparast; Mohammad Javad Hassani; Erfan Azimi; M. Ebrahim Adabi; Jafar Adabi; Edris Pouresmaeil. Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter. IEEE Transactions on Power Electronics 2020, 36, 7087 -7096.
AMA StyleAryorad Khodaparast, Mohammad Javad Hassani, Erfan Azimi, M. Ebrahim Adabi, Jafar Adabi, Edris Pouresmaeil. Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter. IEEE Transactions on Power Electronics. 2020; 36 (6):7087-7096.
Chicago/Turabian StyleAryorad Khodaparast; Mohammad Javad Hassani; Erfan Azimi; M. Ebrahim Adabi; Jafar Adabi; Edris Pouresmaeil. 2020. "Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter." IEEE Transactions on Power Electronics 36, no. 6: 7087-7096.
A bi-level operation scheduling of distribution system operator (DSO) and multi-microgrids (MMGs) considering both the wholesale market and retail market is presented in this paper. To this end, the upper-level optimization problem minimizes the total costs from DSO’s point of view, while the profits of microgrids (MGs) are maximized in the lower-level optimization problem. Besides, a scenario-based stochastic programming framework using the heuristic moment matching (HMM) method is developed to tackle the uncertain nature of the problem. In this regard, the HMM technique is employed to model the scenario matrix with a reduced number of scenarios, which is effectively suitable to achieve the correlations among uncertainties. In order to solve the proposed non-linear bi-level model, Karush–Kuhn–Tucker (KKT) optimality conditions and linearization techniques are employed to transform the bi-level problem into a single-level mixed-integer linear programming (MILP) optimization problem. The effectiveness of the proposed model is demonstrated on a real-test MMG system.
Saeid Esmaeili; Amjad Anvari-Moghaddam; Erfan Azimi; Alireza Nateghi; João P. S. P. S. Catalão. Bi-Level Operation Scheduling of Distribution Systems with Multi-Microgrids Considering Uncertainties. Electronics 2020, 9, 1441 .
AMA StyleSaeid Esmaeili, Amjad Anvari-Moghaddam, Erfan Azimi, Alireza Nateghi, João P. S. P. S. Catalão. Bi-Level Operation Scheduling of Distribution Systems with Multi-Microgrids Considering Uncertainties. Electronics. 2020; 9 (9):1441.
Chicago/Turabian StyleSaeid Esmaeili; Amjad Anvari-Moghaddam; Erfan Azimi; Alireza Nateghi; João P. S. P. S. Catalão. 2020. "Bi-Level Operation Scheduling of Distribution Systems with Multi-Microgrids Considering Uncertainties." Electronics 9, no. 9: 1441.
A new structure of switched capacitor multilevel inverter (SCMLI) capable of voltage boosting and with self-balancing ability is introduced in this article. This advantage is the result of a step by step rise of capacitor voltages in each module, supplied by just one DC voltage source. The proposed topology generates a sinusoidal output waveform with a magnitude several times greater than the input one. Higher output staircase AC voltage is obtained by applying a nearest level control (NLC) modulation technique. The most significant features of this configuration can be mentioned as: fewer semiconductor devices, remarkably low total harmonic distortion (THD), desirable operating under high /low frequency, high efficiency, inherent bipolar voltage production, easy circuit expansion, ease of control and size reduction of the circuit thanks to utilizing neither bulky transformer nor inductor. Moreover, the proposed SCMLI is comprehensively surveyed through theoretical investigation and a comparison of its effectiveness to recent topologies. Eventually, the operating principle of a 25-level prototype of the suggested SCMLI is validated by simulation in the MATLAB SIMULINK environment and experimental results.
Aryorad Khodaparast; Erfan Azimi; Ali Azimi; M. Ebrahim Adabi; Jafar Adabi; Edris Pouresmaeil. A New Modular Multilevel Inverter Based on Step-Up Switched-Capacitor Modules. Energies 2019, 12, 524 .
AMA StyleAryorad Khodaparast, Erfan Azimi, Ali Azimi, M. Ebrahim Adabi, Jafar Adabi, Edris Pouresmaeil. A New Modular Multilevel Inverter Based on Step-Up Switched-Capacitor Modules. Energies. 2019; 12 (3):524.
Chicago/Turabian StyleAryorad Khodaparast; Erfan Azimi; Ali Azimi; M. Ebrahim Adabi; Jafar Adabi; Edris Pouresmaeil. 2019. "A New Modular Multilevel Inverter Based on Step-Up Switched-Capacitor Modules." Energies 12, no. 3: 524.