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This paper presents a proposal for potential bioelectrochemical power to gas stations. It consists of a two-level voltage source converter interfacing the electrical grid on the AC side and an electromethanogenesis based bioelectrochemical system (EMG-BES) working as a stacked module on the DC side. The proposed system converts CO2 and electrical energy into methane, using wastewater as the additional chemical energy input. This energy storage system can contribute to dampening the variability of renewables in the electrical network, provide even flexibility and grid services by controlling the active and reactive power exchanged and is an interesting alternative technology in the market of energy storage for big energy applications. The big challenge for controlling this system lays in the fact that the DC bus voltage of the converter has to be changed in order to regulate the exchanged active power with the grid. This paper presents a cascade approach to control such a system by means of combining external control loops with fast inner loops. The outer power loop, with a proportional-integral (PI) controller with special limitation values and anti-windup capability, is used to generate DC bus voltage reference. An intermediate loop is used for DC bus voltage regulation and current reference generation. A new proportional resonant controller is used to track the current reference. The proposed scheme has been validated through real-time simulation in OPAL OP4510.
Mahdi Shahparasti; Amirhossein Rajaei; Andres Tarraso; Jose Vidal Leon Romay; Alvaro Luna. Control and Validation of a Reinforced Power Conversion System for Upcoming Bioelectrochemical Power to Gas Stations. Electronics 2021, 10, 1470 .
AMA StyleMahdi Shahparasti, Amirhossein Rajaei, Andres Tarraso, Jose Vidal Leon Romay, Alvaro Luna. Control and Validation of a Reinforced Power Conversion System for Upcoming Bioelectrochemical Power to Gas Stations. Electronics. 2021; 10 (12):1470.
Chicago/Turabian StyleMahdi Shahparasti; Amirhossein Rajaei; Andres Tarraso; Jose Vidal Leon Romay; Alvaro Luna. 2021. "Control and Validation of a Reinforced Power Conversion System for Upcoming Bioelectrochemical Power to Gas Stations." Electronics 10, no. 12: 1470.
In this paper, a new modified structure of a DC/DC T-source converter is proposed. Since the proposed converter provides high voltage gain, it is suitable for photovoltaic integration into uninterruptible power supply (UPS) systems. The proposed structure employs partial power processing technique to increase the output voltage as well as efficiency without requiring new hardware. Partial power converters (PPCs) process only a fraction of flowing power while the remaining power directly flows through output. This generally causes an improvement in efficiency and output voltage. A total of two structures are presented: conventional partial power T-source converters and improved partial power T-source converters. The key advantage of the improved partial power converter is a higher voltage gain. Furthermore, it reduces the voltage and the current stresses on switches and diodes. The steady-state operation principles are described for both converters and the governed rules and equations are derived. The PPCs and full power converter are compared in terms of efficiency, voltage gain, voltage stress, and current stress of converter elements. The converter performance is evaluated through experimental and simulation studies. The presented results show good consistency with the theoretical analysis.
Amirhossein Rajaei; Mahdi Shahparasti; Ali Nabinejad; Mehdi Savaghebi. A High Step-Up Partial Power Processing DC/DC T-Source Converter for UPS Application. Sustainability 2020, 12, 10464 .
AMA StyleAmirhossein Rajaei, Mahdi Shahparasti, Ali Nabinejad, Mehdi Savaghebi. A High Step-Up Partial Power Processing DC/DC T-Source Converter for UPS Application. Sustainability. 2020; 12 (24):10464.
Chicago/Turabian StyleAmirhossein Rajaei; Mahdi Shahparasti; Ali Nabinejad; Mehdi Savaghebi. 2020. "A High Step-Up Partial Power Processing DC/DC T-Source Converter for UPS Application." Sustainability 12, no. 24: 10464.
This paper presents a novel inverter topology with a multi-port structure, which aims to connect two independent DC sources to a three-phase load by using single-stage power conversion. The proposed inverter has been developed to be used in hybrid renewable energy applications such as photovoltaic (PV), fuel cell (FC), and battery energy storage systems. Compared to the conventional hybrid dual-source inverters that use a multi-input DC-DC converter to provide a DC-link voltage at the input of the inverter stage, the proposed dual-source inverter uses an integrated DC-AC power conversion stage. The conventional topologies use bulky electrolytic capacitors at the input of the inverter stage, which leads to lower voltage gain and reliability due to high parasitic ESR/ESL and short lifetime of these capacitors. Moreover, compared to existing multi-port voltage source inverters, the proposed topology uses lower semiconductors, cost, and weight and has higher voltage gain. Besides, the proposed topology draws continuous current from both input ports and there is magnetic isolation between the input sources. The analysis and performance of the proposed inverter are verified through both computer simulations and experimental results of a 600 W - 50 Hz laboratory prototype using the Simple Boost-SPWM modulation method.
Majid Ghani Varzaneh; Amirhossein Rajaei; Mojtaba Forouzesh; Yam P. Siwakoti; Frede Blaabjerg. A Single-Stage Multi-Port Buck-Boost Inverter. IEEE Transactions on Power Electronics 2020, 36, 7769 -7782.
AMA StyleMajid Ghani Varzaneh, Amirhossein Rajaei, Mojtaba Forouzesh, Yam P. Siwakoti, Frede Blaabjerg. A Single-Stage Multi-Port Buck-Boost Inverter. IEEE Transactions on Power Electronics. 2020; 36 (7):7769-7782.
Chicago/Turabian StyleMajid Ghani Varzaneh; Amirhossein Rajaei; Mojtaba Forouzesh; Yam P. Siwakoti; Frede Blaabjerg. 2020. "A Single-Stage Multi-Port Buck-Boost Inverter." IEEE Transactions on Power Electronics 36, no. 7: 7769-7782.
In high voltage applications, sensorless voltage control techniques can reduce the cost and increase the reliability of DC-DC converters. In this paper, a sensorless voltage observer for a current fed Cockcroft-Walton voltage multiplier is designed. The first step is to derive the converter model. Since any inaccuracy in the derived model can result in a discrepancy between the observed voltage and the actual output voltage, an accurate model is derived, which incorporates the influential elements. Then, two voltage observers based on the extended Kalman filter (EKF) are designed and used to estimate the output voltage, transformer magnetizing current and inductor current for two different configurations of the high step-up DC-DC converter. Experimental and simulation results of the system show the efficiency of the observers. The proposed observers represent good precision as the main parasitic parameters are considered in the converter model.
Karim Haadi; Amirhossein Rajaei; Mahdi Shahparasti; Akbar Rahideh. Sensorless Voltage Observer for a Current-Fed High Step-Up DC-DC Converter Using Extended Kalman Filter. Electronics 2020, 9, 2066 .
AMA StyleKarim Haadi, Amirhossein Rajaei, Mahdi Shahparasti, Akbar Rahideh. Sensorless Voltage Observer for a Current-Fed High Step-Up DC-DC Converter Using Extended Kalman Filter. Electronics. 2020; 9 (12):2066.
Chicago/Turabian StyleKarim Haadi; Amirhossein Rajaei; Mahdi Shahparasti; Akbar Rahideh. 2020. "Sensorless Voltage Observer for a Current-Fed High Step-Up DC-DC Converter Using Extended Kalman Filter." Electronics 9, no. 12: 2066.
Amirhossein Rajaei; Iman Dehghanian; Mahdi Shahparasti; Edris Pouresmaeil. Correction to: Behavioral switching model for current‑fed Cockcroft–Walton voltage multiplier. Journal of Power Electronics 2020, 20, 1119 -1119.
AMA StyleAmirhossein Rajaei, Iman Dehghanian, Mahdi Shahparasti, Edris Pouresmaeil. Correction to: Behavioral switching model for current‑fed Cockcroft–Walton voltage multiplier. Journal of Power Electronics. 2020; 20 (4):1119-1119.
Chicago/Turabian StyleAmirhossein Rajaei; Iman Dehghanian; Mahdi Shahparasti; Edris Pouresmaeil. 2020. "Correction to: Behavioral switching model for current‑fed Cockcroft–Walton voltage multiplier." Journal of Power Electronics 20, no. 4: 1119-1119.
After about 80 years of introducing the Cockcroft–Walton (CW) circuit, it is still widely used because of its advantages, such as simplicity and high step-up gain. Several studies focused on the performance and design optimization of the circuit, but a dynamic model of the circuit remains to be established. This study analyzed the operation principles of an n-stage current-fed Cockcroft–Walton (CF-CWVM) during transient and steady-state operations. Then, an approach was derived to achieve a mathematical model for CF-CWVM with an arbitrary number of stages. A mathematical model for one- and two-stage CF-CWVM was developed, and its results were compared with simulation results. The theoretical model and simulations were validated by providing a prototype of CF-CWVM and comparing the results with the model outputs.
Amirhossein Rajaei; Iman Dehghanian; Mahdi Shahparasti; Edris Pouresmaeil. Behavioral switching model for current-fed Cockcroft–Walton voltage multiplier. Journal of Power Electronics 2020, 20, 365 -375.
AMA StyleAmirhossein Rajaei, Iman Dehghanian, Mahdi Shahparasti, Edris Pouresmaeil. Behavioral switching model for current-fed Cockcroft–Walton voltage multiplier. Journal of Power Electronics. 2020; 20 (2):365-375.
Chicago/Turabian StyleAmirhossein Rajaei; Iman Dehghanian; Mahdi Shahparasti; Edris Pouresmaeil. 2020. "Behavioral switching model for current-fed Cockcroft–Walton voltage multiplier." Journal of Power Electronics 20, no. 2: 365-375.
In this paper, two new structures are proposed for diode-assisted extended-boost continuous-current quasi-Z-source inverter (qZS). In the proposed structures to reduce the capacitors and diodes voltage stresses, a new switched inductor structure is used. Voltage gains of inverters in the proposed and conventional topologies have the same magnitude. Moreover, the startup inrush current in the proposed topologies is decreased. In this article, at first, the proposed Z-source inventers are investigated to find out their governing relations. Then, the proposed Z-source inverters are compared with the conventional ones by simulating them to assess their performance efficiency. Next, applying the simple boost pulse width modulation the simulation is carried out in PSCAD/EMTDC software. To evaluate the obtained results, the prototypes of the proposed inverters with 48Vdc input voltage are used.
Milad Abbasi; Mohammad Mardaneh; Majid Ghani; Amirhossein Rajaei. Modified diode-assisted quasi-ZSI with reduced voltage stress on diodes and capacitors. EPE Journal 2020, 30, 57 -68.
AMA StyleMilad Abbasi, Mohammad Mardaneh, Majid Ghani, Amirhossein Rajaei. Modified diode-assisted quasi-ZSI with reduced voltage stress on diodes and capacitors. EPE Journal. 2020; 30 (2):57-68.
Chicago/Turabian StyleMilad Abbasi; Mohammad Mardaneh; Majid Ghani; Amirhossein Rajaei. 2020. "Modified diode-assisted quasi-ZSI with reduced voltage stress on diodes and capacitors." EPE Journal 30, no. 2: 57-68.
Multi input–multi output Power electronic interface for hybrid energy resources has gathered much of interest. In this paper, a new configuration for cascade connection of two Z-Impedance networks is presented which is able to extract power from two separate low voltage energy sources such as photovoltaic panels and fuel cell stacks. The required load power can be shared between two sources which may have different low values. The power sharing is controlled by adjusting the shoot through duration and time shifting. The proposed converter includes the features of conventional Z-source converter such as voltage boost and shoot through immunity of the inverter. Steady state operation principles, switching methods and the main relations for power flow from two inputs to the output are derived. A prototype of the converter is built and tested for different operation modes. The results are compared with simulations and theoretical analysis which verify well performance of the system.
Majid Ghani Varzaneh; Amirhossein Rajaei; Mohammad Mardaneh. Dual-source inverter for hybrid PV–FC application. SN Applied Sciences 2019, 1, 1470 .
AMA StyleMajid Ghani Varzaneh, Amirhossein Rajaei, Mohammad Mardaneh. Dual-source inverter for hybrid PV–FC application. SN Applied Sciences. 2019; 1 (11):1470.
Chicago/Turabian StyleMajid Ghani Varzaneh; Amirhossein Rajaei; Mohammad Mardaneh. 2019. "Dual-source inverter for hybrid PV–FC application." SN Applied Sciences 1, no. 11: 1470.
This study proposes a novel pulse width modulation (PWM) algorithm to mitigate the common mode voltage (CMV) in a multi-level voltage source inverter feeding an electric machine. Dead-time effect frequently prevents the CMV not to reach zero in several switching periods. Then the electromagnetic interference noise is generated and causes bearing failure and overvoltage stress on winding insulations. The proposed strategy compensates the dead-time effect that alleviates the high-amplitude rectangular pulses with extreme range of variations during high-frequency switching transitions. The existing PWM methods reduce the CMV to however by utilising the presented approach, CMV can be reduced to zero. However, the total harmonic distortion will be increased 0.3% at fundamental current harmonic rather than conventional state PWM method, which could be neglected. Simulation results and efficiency analysis imply on worthy performance of the proposed strategy to eliminate the CMV.
Mehrdad Mahmoudian; Mohsen Gitizadeh; Amir Hosein Rajaei; Vahid Moradzadeh Tehrani. Common mode voltage suppression in three‐phase voltage source inverters with dynamic load. IET Power Electronics 2019, 12, 3141 -3148.
AMA StyleMehrdad Mahmoudian, Mohsen Gitizadeh, Amir Hosein Rajaei, Vahid Moradzadeh Tehrani. Common mode voltage suppression in three‐phase voltage source inverters with dynamic load. IET Power Electronics. 2019; 12 (12):3141-3148.
Chicago/Turabian StyleMehrdad Mahmoudian; Mohsen Gitizadeh; Amir Hosein Rajaei; Vahid Moradzadeh Tehrani. 2019. "Common mode voltage suppression in three‐phase voltage source inverters with dynamic load." IET Power Electronics 12, no. 12: 3141-3148.
Employing partial power processing (PPP) technique for quasi Z-source converter (QZSC) a new structure of the converter is presented. Using PPP technique although eliminates electrical insolation, but permits reducing voltage and current stress at the semiconductors, if compared with full power proposals. In this work, two PPP structures are discussed: A first one, similar to the basic topology, where the output voltage of the power converter is in series with the input voltage; and a second one, where the output is in series with the capacitor of the QZSC. This minor modification, which requires no extra elements, improves the power rating, voltage gain, and requires a lower transformation ratio. An experimental prototype of the proposed converter has been tested and the results are compared with other implementations, permitting to validate the theoretical analysis as well as the advantages that this proposal provides.
Shahin Honarmand; Amirhossein Rajaei; Mahdi Shahparasti; Alvaro Luna; Edris Pouresmaeil. A Modified Partial Power structure for Quasi Z-Source Converter to Improve Voltage Gain and Power Rating. Energies 2019, 12, 2139 .
AMA StyleShahin Honarmand, Amirhossein Rajaei, Mahdi Shahparasti, Alvaro Luna, Edris Pouresmaeil. A Modified Partial Power structure for Quasi Z-Source Converter to Improve Voltage Gain and Power Rating. Energies. 2019; 12 (11):2139.
Chicago/Turabian StyleShahin Honarmand; Amirhossein Rajaei; Mahdi Shahparasti; Alvaro Luna; Edris Pouresmaeil. 2019. "A Modified Partial Power structure for Quasi Z-Source Converter to Improve Voltage Gain and Power Rating." Energies 12, no. 11: 2139.
An isolated full power (FP) converter can be easily transformed into a partial power (PP) converter by changing the connections of source and load to the converter. This is known as partial power processing technique which can improve voltage gain, power rating and efficiency of the system. This paper discusses the dynamic behavior of PP converter. A general procedure is proposed to find the dynamic equations and ac small signal relations for input-to-output voltage and duty ratio-to-output voltage transfer functions of PP converter. It requires only the dynamic equations of FP converter. Therefore, circuit analysis is not necessary. The presented methodology is applicable to the converters with any number of switching states. In order to validate the proposed method, it is applied to partial power quasi z-source DC-DC converter. Several experimental/simulation tests are performed and the results are compared to the modeling results. Frequency responses of Gvd and Gvg are obtained by simulations, while experiments verify the theoretical predictions.
Ali Nabinejad; Amirhossein Rajaei; Mohammad Mardaneh. A Systematic Approach to Extract State-Space Averaged Equations and Small-Signal Model of Partial-Power Converters. IEEE Journal of Emerging and Selected Topics in Power Electronics 2019, 8, 2475 -2483.
AMA StyleAli Nabinejad, Amirhossein Rajaei, Mohammad Mardaneh. A Systematic Approach to Extract State-Space Averaged Equations and Small-Signal Model of Partial-Power Converters. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2019; 8 (3):2475-2483.
Chicago/Turabian StyleAli Nabinejad; Amirhossein Rajaei; Mohammad Mardaneh. 2019. "A Systematic Approach to Extract State-Space Averaged Equations and Small-Signal Model of Partial-Power Converters." IEEE Journal of Emerging and Selected Topics in Power Electronics 8, no. 3: 2475-2483.
Losses of power semiconductor switching devices used in grid-connected wind energy conversion systems (WECSs) are regarded as one of the main issues to be considered when comparing different types of grid interface systems (GISs). This loss is more highlighted for low-power applications, because it directly affects the reliability and efficiency of the system. Recently, a GIS using Vienna rectifier (VR) as generator-side converter is investigated for a permanent magnet synchronous generator-based WECS. Due to its cost advantage, this reduced switch count rectifier is specifically attractive for low-power applications. In this study, the analytical relations for switching and conduction losses of a VR-based GIS are derived and compared to conventional back-to-back systems. As for the grid-side converter, two types of inverters, conventional six-switch inverter and B4 inverter, are considered and the efficiency of GIS is investigated analytically. In order to derive the loss equations for VR, a new current PWM method is presented explaining the formulas required for its implementation. Finding the relations for switching loss and efficiency, different GISs are compared and the most efficient ones are determined for different ratings. The GISs are also simulated, and their switching power losses for different operating points are shown.
Amirhossein Rajaei; Mustafa Mohamadian; Ali Yazdian. Efficiency Analysis of Vienna Rectifier-Based Grid interface Systems for Low-Power PM WECS. Iranian Journal of Science and Technology, Transactions of Electrical Engineering 2019, 43, 577 -586.
AMA StyleAmirhossein Rajaei, Mustafa Mohamadian, Ali Yazdian. Efficiency Analysis of Vienna Rectifier-Based Grid interface Systems for Low-Power PM WECS. Iranian Journal of Science and Technology, Transactions of Electrical Engineering. 2019; 43 (3):577-586.
Chicago/Turabian StyleAmirhossein Rajaei; Mustafa Mohamadian; Ali Yazdian. 2019. "Efficiency Analysis of Vienna Rectifier-Based Grid interface Systems for Low-Power PM WECS." Iranian Journal of Science and Technology, Transactions of Electrical Engineering 43, no. 3: 577-586.
Maximum power point tracking (MPPT) is an inevitable part of new controller design for PV connected voltage converters used to extract energy. To simplify the implementation of the algorithm, in this paper, an analog circuit for MPPT of a PV battery charger is proposed which works in a full range condition with constant switching frequency. Besides this, a new robust controller parameter is introduced. As discussed in the paper, conventional MPPT algorithms provide PV current or voltage reference value as output controller parameter, which fast climate changes may cause system instability. Here, a new variable is defined to eliminate the problem and improve the stability of the system. To compare the presented circuit with a conventional system, perturb and observe MPPT algorithm which is well-known in PV systems is implemented on the same system. The proposed system is also compared with a recently developed current-mode system. Simulation results for both simulations are presented and compared which demonstrate performance and effectiveness of the proposed analog MPPT circuit.
Amirhossein Rajaei. A New Robust Analog Maximum Power Point Tracker for a PV Battery Charger. Iranian Journal of Science and Technology, Transactions of Electrical Engineering 2018, 42, 123 -133.
AMA StyleAmirhossein Rajaei. A New Robust Analog Maximum Power Point Tracker for a PV Battery Charger. Iranian Journal of Science and Technology, Transactions of Electrical Engineering. 2018; 42 (2):123-133.
Chicago/Turabian StyleAmirhossein Rajaei. 2018. "A New Robust Analog Maximum Power Point Tracker for a PV Battery Charger." Iranian Journal of Science and Technology, Transactions of Electrical Engineering 42, no. 2: 123-133.
A new non-isolated, high step-up DC-DC converter is proposed based on the current-fed Cockcroft-Walton Voltage Multiplier (CW-VM) that can be used as the boosting power stage of converter for low-voltage low power renewable energy sources such as photovoltaic and fuel cells. The proposed converter employs two low-voltage common-emitter switches. Utilizing the current-fed CW-VM eliminates some problems associated with the conventional voltage-fed type such as voltage ripple and load-dependent voltage droop. Other advantages of the proposed converter are continuous input current, high voltage gain, and high efficiency. Steady state operation principles, specifications, and design considerations of the proposed converter are illustrated. Furthermore, efficiency analysis of the converter is performed and discussed. Experimental tests for a 200 W prototype are carried out which confirm the theoretical analysis.
Amirhossein Rajaei; Reza Khazan; Mehrdad Mahmoudian; Mohammad Mardaneh; Mohsen Gitizadeh. A Dual Inductor High Step-Up DC/DC Converter Based on the Cockcroft–Walton Multiplier. IEEE Transactions on Power Electronics 2018, 33, 9699 -9709.
AMA StyleAmirhossein Rajaei, Reza Khazan, Mehrdad Mahmoudian, Mohammad Mardaneh, Mohsen Gitizadeh. A Dual Inductor High Step-Up DC/DC Converter Based on the Cockcroft–Walton Multiplier. IEEE Transactions on Power Electronics. 2018; 33 (11):9699-9709.
Chicago/Turabian StyleAmirhossein Rajaei; Reza Khazan; Mehrdad Mahmoudian; Mohammad Mardaneh; Mohsen Gitizadeh. 2018. "A Dual Inductor High Step-Up DC/DC Converter Based on the Cockcroft–Walton Multiplier." IEEE Transactions on Power Electronics 33, no. 11: 9699-9709.
Hyperthermia utilizing nanoparticles is a novel cancer therapy which relies on the heat released when nanoparticles inside a tumor are exposed to an alternating magnetic field. The field strength and frequency are the main variants affect performance of nanoparticles for heat generation. Besides the characteristics of nanoparticle, which is the main criteria for tuning amplitude and frequency of magnetic field generated by an alternating magnetic field generator (AMFG), several parameters should be considered for an optimum design, which is related to AMFG design. These parameters are input voltage range, copper tube resistance used for solenoid coil, coil number of turns, and etc. According to these criteria, design procedure of AMFG for research applications is performed to maximize the heat released by nanoparticles. In order to validate the design, an experimental set up of AMFG is prepared which is used for in vivo hyperthermia tests. The experimental results are shown and compared to the simulations.
Mahdi Mohseni; Amirhossein Rajaei. Design of Alternating Magnetic Field Generator for Magnetic Fluid Hyperthermia Research Application. Scientia Iranica 2017, 1 .
AMA StyleMahdi Mohseni, Amirhossein Rajaei. Design of Alternating Magnetic Field Generator for Magnetic Fluid Hyperthermia Research Application. Scientia Iranica. 2017; ():1.
Chicago/Turabian StyleMahdi Mohseni; Amirhossein Rajaei. 2017. "Design of Alternating Magnetic Field Generator for Magnetic Fluid Hyperthermia Research Application." Scientia Iranica , no. : 1.
Model Predictive Control (MPC) uses the model of system at current time to predict the system behavior at the future sampling interval in the prediction horizon and sets a number of variables to their references due to their controllability from input variables. This paper concentrates on the design and analysis of a controller for Distributed Generation (DG) microgrids in islanding and grid connected operation modes using a Receding Horizon MPC scheme. In this contribution, active and reactive powers are used in a cost function as an inner control loop to produce switching states. Two outer voltage and frequency droop loops share active and reactive powers between DGs in the microgrid. The design concept of the proposed control system is evaluated through simulation studies and experiment under different test scenarios. The impact of the simulation and the experimental results shows that the operations of the DG units within the microgrid can be coordinated effectively under the proposed control system to ensure stable operation of the overall microgrid and power quality improvement.
Mohammad Mehdi Ghanbarian; Majid Nayeripour; Amir Hosein Rajaei; Fatemeh Jamshidi; Eberhard Waffenschmidt. Model predictive control of distributed generation micro-grids in island and grid connected operation under balanced and unbalanced conditions. Journal of Renewable and Sustainable Energy 2017, 9, 045303 .
AMA StyleMohammad Mehdi Ghanbarian, Majid Nayeripour, Amir Hosein Rajaei, Fatemeh Jamshidi, Eberhard Waffenschmidt. Model predictive control of distributed generation micro-grids in island and grid connected operation under balanced and unbalanced conditions. Journal of Renewable and Sustainable Energy. 2017; 9 (4):045303.
Chicago/Turabian StyleMohammad Mehdi Ghanbarian; Majid Nayeripour; Amir Hosein Rajaei; Fatemeh Jamshidi; Eberhard Waffenschmidt. 2017. "Model predictive control of distributed generation micro-grids in island and grid connected operation under balanced and unbalanced conditions." Journal of Renewable and Sustainable Energy 9, no. 4: 045303.
An analog circuit for maximum power point tracking of a PV battery charger with minimum number of elements is proposed which works in a full range condition with a fixed switching frequency. In conventional MPPT algorithms which provide PV current or voltage reference value as output, fast climate changes may cause system instability. Here, a new variable is defined to eliminate the problem and improve the stability of the system. In order to compare the presented circuit with a conventional system, perturb and observe (P&O) MPPT algorithm which is well-known in PV systems is implemented on the same system. Simulation results (Conventional P&O algorithm and proposed structure) are presented and compared which demonstrate performance and effectiveness of the proposed analog MPPT circuit. An experimental set up has been made which the results match with theory and simulation.
Shahriyar Kaboli; Amir Hossein Rajaei. A robust maximum power point tracker with fully analog implementation. 2017 8th Power Electronics, Drive Systems & Technologies Conference (PEDSTC) 2017, 490 -495.
AMA StyleShahriyar Kaboli, Amir Hossein Rajaei. A robust maximum power point tracker with fully analog implementation. 2017 8th Power Electronics, Drive Systems & Technologies Conference (PEDSTC). 2017; ():490-495.
Chicago/Turabian StyleShahriyar Kaboli; Amir Hossein Rajaei. 2017. "A robust maximum power point tracker with fully analog implementation." 2017 8th Power Electronics, Drive Systems & Technologies Conference (PEDSTC) , no. : 490-495.
Wind energy is a prominent area of application of variable-speed generators operating on the constant grid frequency. This paper describes the operation and control of one of these variable-speed wind generators: the direct driven permanent magnet synchronous generator (PMSG). This generator is connected to the power network by means of a fully controlled frequency converter, which consists of a pulse-width-modulation (PWM) rectifier, an intermediate dc circuit, and a PWM inverter. In this study, simultaneous connection of two PMSGs to a common DC link is considered. The power of the generators is transferred to a capacitor; afterwards, it is delivered to the grid according to the demanded level.
Seyed Mohammad; Reza Moosavi; Akbar Rahideh; Majid Nayeripour; Masoud Jokar; Amir Hossein Rajaei; Rasool Hemmati. Vector control of two PMSGs with a common DC link for grid connected wind energy conversion. 2016 24th Iranian Conference on Electrical Engineering (ICEE) 2016, 1023 -1026.
AMA StyleSeyed Mohammad, Reza Moosavi, Akbar Rahideh, Majid Nayeripour, Masoud Jokar, Amir Hossein Rajaei, Rasool Hemmati. Vector control of two PMSGs with a common DC link for grid connected wind energy conversion. 2016 24th Iranian Conference on Electrical Engineering (ICEE). 2016; ():1023-1026.
Chicago/Turabian StyleSeyed Mohammad; Reza Moosavi; Akbar Rahideh; Majid Nayeripour; Masoud Jokar; Amir Hossein Rajaei; Rasool Hemmati. 2016. "Vector control of two PMSGs with a common DC link for grid connected wind energy conversion." 2016 24th Iranian Conference on Electrical Engineering (ICEE) , no. : 1023-1026.
Nowadays, magnetic nanoparticles (MNPs) have received much attention because of their enormous potentials in many fields such as magnetic fluid hyperthermia (MFH). The goal of hyperthermia is to increase the temperature of malignant cells to destroy them without any lethal effect on normal tissues. To investigate the effectiveness of cancer therapy by magnetic fluid hyperthermia, Fe0.5Zn0.5Fe2O4 nanoparticles (FNPs) were used to undergo external magnetic field (f=515 kHz, H=100 G) in mice bearing implanted tumor. FNPs were synthesized via precipitation and characterized using transmission electron microscopy (TEM), vibrating sample magnetometer, and Fourier transform infrared. For in vivo study, the mice bearing implanted tumor were divided into four groups (two mice per group), namely, control group, AMF group, MNPs group, and MNPs&AMF group. After 24 hours, the mice were sacrificed and each tumor specimen was prepared for histological analyses. The necrotic surface area was estimated by using graticule (Olympus, Japan) on tumor slides. The mean diameter of FNPs was estimated around 9 nm by TEM image and M versus H curve indicates that this particle is among superparamagnetic materials. According to histological analyses, no significant difference in necrosis extent was observed among the four groups. FNPs are biocompatible and have a good size for biomedical applications. However, for MFH approach, larger diameters especially in the range of ferromagnetic particles due to hysteresis loss can induce efficient heat in the target region.
Maryam Heidari; Naghmeh Sattarahmady; Sirus Javadpour; Negar Azarpira; Hossein Heli; Alireza Mehdizadeh; Amirhossein Rajaei; Tahereh Zare. Effect of Magnetic Fluid Hyperthermia on Implanted Melanoma in Mouse Models. Iranian journal of medical sciences 2016, 41, 314 -321.
AMA StyleMaryam Heidari, Naghmeh Sattarahmady, Sirus Javadpour, Negar Azarpira, Hossein Heli, Alireza Mehdizadeh, Amirhossein Rajaei, Tahereh Zare. Effect of Magnetic Fluid Hyperthermia on Implanted Melanoma in Mouse Models. Iranian journal of medical sciences. 2016; 41 (4):314-321.
Chicago/Turabian StyleMaryam Heidari; Naghmeh Sattarahmady; Sirus Javadpour; Negar Azarpira; Hossein Heli; Alireza Mehdizadeh; Amirhossein Rajaei; Tahereh Zare. 2016. "Effect of Magnetic Fluid Hyperthermia on Implanted Melanoma in Mouse Models." Iranian journal of medical sciences 41, no. 4: 314-321.
A new approach for minimization of total harmonic distortion (THD) of a multilevel flying capacitor inverter (MFCI) based on the selective harmonic elimination named stochastic THD (STHD) strategy is proposed. In the STHD strategy, the step voltage levels of multilevel inverter are considered to be varying due to unbalanced capacitor voltages. Moreover, this paper improves modeling of harmonic elimination by considering the effects of dissipative snubbers, blanking time, gate-drive circuits, and computation time in microcontrollers on the THD calculation. Switching instants are deviated from the desired moments by regarding the mentioned effects. In the proposed strategy, the switching angle variations and unbalancing of flying capacitor voltages are evaluated by 2 m + 1 point estimate strategy. Then, the formulation is combined with new modified cuckoo search algorithm and a self-adaptive mutation tactic for the establishment of new robust algorithm for minimization of the THD. The proposed STHD strategy is capable of determining the best switching angles pattern in low switching frequency without measuring current and capacitor voltages, as well as not using any controller. The proposed strategy is applied on three MFCIs and the results show that the proposed method effectively minimizes specific harmonics with low THD.
Hamid Reza Massrur; Taher Niknam; Mohammad Mardaneh; Amirhossein Rajaei. Harmonic Elimination in Multilevel Inverters Under Unbalanced Voltages and Switching Deviation Using a New Stochastic Strategy. IEEE Transactions on Industrial Informatics 2016, 12, 716 -725.
AMA StyleHamid Reza Massrur, Taher Niknam, Mohammad Mardaneh, Amirhossein Rajaei. Harmonic Elimination in Multilevel Inverters Under Unbalanced Voltages and Switching Deviation Using a New Stochastic Strategy. IEEE Transactions on Industrial Informatics. 2016; 12 (2):716-725.
Chicago/Turabian StyleHamid Reza Massrur; Taher Niknam; Mohammad Mardaneh; Amirhossein Rajaei. 2016. "Harmonic Elimination in Multilevel Inverters Under Unbalanced Voltages and Switching Deviation Using a New Stochastic Strategy." IEEE Transactions on Industrial Informatics 12, no. 2: 716-725.