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Microgrid as the main building block for future smart grids is prone to instability originated from converter-based distributed generations (DG). Herein, we first analyze the small-signal stability of an inverter-interfaced microgrid. Then, a novel adaptive network fuzzy inference system (ANFIS)-based optimization method is introduced which aims at online tuning of virtual inductances (VI) in the islanded microgrids. The data for ANFIS training is drawn by particle swarm optimization (PSO) algorithm and the proposed objective function. A total of 140 load scenarios are considered to provide optimal VI in each load condition and generate optimal data for ANFIS training. This process yields minimizing reactive power mismatches and improves microgrid stability in different load levels. The simultaneous application of PSO algorithm and ANFIS training facilitates the objectives pursued by current study. Finally, the trained ANFIS networks are installed in the converter control. The adaptive performance of ANFIS controllers makes the converters responses independent from load change location and value. The effectiveness of the proposed control methodology is verified using simulations studies.
Bahram Pournazarian; Reza Sangrody; Meysam Saeedian; Oriol Gomis-Bellmunt; Edris Pouresmaeil. Enhancing Microgrid Small-Signal Stability and Reactive Power Sharing Using ANFIS-Tuned Virtual Inductances. IEEE Access 2021, 9, 104915 -104926.
AMA StyleBahram Pournazarian, Reza Sangrody, Meysam Saeedian, Oriol Gomis-Bellmunt, Edris Pouresmaeil. Enhancing Microgrid Small-Signal Stability and Reactive Power Sharing Using ANFIS-Tuned Virtual Inductances. IEEE Access. 2021; 9 (99):104915-104926.
Chicago/Turabian StyleBahram Pournazarian; Reza Sangrody; Meysam Saeedian; Oriol Gomis-Bellmunt; Edris Pouresmaeil. 2021. "Enhancing Microgrid Small-Signal Stability and Reactive Power Sharing Using ANFIS-Tuned Virtual Inductances." IEEE Access 9, no. 99: 104915-104926.
An accurate and real-time knowledge of temperatures in insulated-gate bipolar transistor modules is crucial for reliability analysis and thermal management of power electronic converters. For this purpose, this paper establishes an integrated thermal equivalent circuit model comprising self-heating thermal impedances and cross-heating thermal impedances to provide a temperature profile of the junction and solder joints during various operations and in the case of thermal aging. The thermal resistance and capacitance parameters of the thermal impedances are characterized in terms of different electro-thermal operating conditions and solder joints aging conditions with the help of three-dimensional finite element simulations. Also, the effect of the heatsink, which brings an uneven heat transfer coefficient distribution at the module baseplate, is investigated and modeled into the thermal impedances. The introduced thermal model can work even if the conditions change simultaneously. The accuracy of the model is verified by experiments and finite element simulations, all of which agree with negligible error unlike thermal models given in the datasheet and fixed-parameter thermal models.
Mohsen Akbari; Mohammad Tavakoli Bina; Amir Sajjad Bahman; Bahman Eskandari; Edris Pouresmaeil; Frede Blaabjerg. An Extended Multilayer Thermal Model for Multichip IGBT Modules Considering Thermal Aging. IEEE Access 2021, 9, 84217 -84230.
AMA StyleMohsen Akbari, Mohammad Tavakoli Bina, Amir Sajjad Bahman, Bahman Eskandari, Edris Pouresmaeil, Frede Blaabjerg. An Extended Multilayer Thermal Model for Multichip IGBT Modules Considering Thermal Aging. IEEE Access. 2021; 9 (99):84217-84230.
Chicago/Turabian StyleMohsen Akbari; Mohammad Tavakoli Bina; Amir Sajjad Bahman; Bahman Eskandari; Edris Pouresmaeil; Frede Blaabjerg. 2021. "An Extended Multilayer Thermal Model for Multichip IGBT Modules Considering Thermal Aging." IEEE Access 9, no. 99: 84217-84230.
There are some environmental factors, such as ambient temperature, dust, etc., which cause a reduction in the efficiency of Photovoltaic (PV) systems. Installation of PV panels on the water surface, commonly known as Floating Photovoltaic (FPV) systems, is one solution to employ PV panels in a cooler environment, achieve higher efficiency, and reduce water evaporation. FPV systems open up new opportunities for scaling up solar generating capacity, especially in countries with high population density and valuable lands, as well as countries with high evaporation rates and water resources deficiency. Since the FPV system is an almost new concept, its cleaning techniques have not been comprehensively studied. While FPV systems are located on the surface of water resources and reservoirs, the water quality can limit the application of different cleaning techniques. Therefore, this paper investigates different techniques of FPV systems cleaning and categorizes them into water-based and water-free approaches. In addition, their cleaning frequencies, as well as economic aspects, are presented and discussed to determine their merits and demerits for using them in FPV systems.
Rafi Zahedi; Parisa Ranjbaran; Gevork Gharehpetian; Fazel Mohammadi; Roya Ahmadiahangar. Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives. Energies 2021, 14, 2018 .
AMA StyleRafi Zahedi, Parisa Ranjbaran, Gevork Gharehpetian, Fazel Mohammadi, Roya Ahmadiahangar. Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives. Energies. 2021; 14 (7):2018.
Chicago/Turabian StyleRafi Zahedi; Parisa Ranjbaran; Gevork Gharehpetian; Fazel Mohammadi; Roya Ahmadiahangar. 2021. "Cleaning of Floating Photovoltaic Systems: A Critical Review on Approaches from Technical and Economic Perspectives." Energies 14, no. 7: 2018.
Diesel generator emulators (DGEs) are commonly used instead of real diesel generator units in laboratory-scale studies for their lower noise, more flexible parameters design and lower environmental pollution. This study presents a new control system in αβ framework for a DGE based on power electronic converter. The proposed control system has two parallel control paths including the frequency path and the voltage path. The voltage path consists of a PI controller that generates the amplitude of the modulation reference waveform. The frequency path consists of a transfer function in series with a droop curve to generate the angle of the modulation reference waveform. Finally, the angle and amplitude are applied to an especial space vector modulation unit for generation of the inverter gate pulses. The presented algorithm can be simply implemented in αβ framework with no need to PLL system and park transformation. It employs just one PI controller which can be easily implemented and tuned on the microcontroller. The experimental and simulation results verify the accuracy and performance of the proposed method.
M. S. Mahdavi; G. B. Gharehpetian; Ali Ghasemi. An Enhanced Converter-based Diesel Generator Emulator for Voltage and Frequency Control Studies in Laboratory-Scale Microgrids. Iranian Journal of Science and Technology, Transactions of Electrical Engineering 2021, 1 -13.
AMA StyleM. S. Mahdavi, G. B. Gharehpetian, Ali Ghasemi. An Enhanced Converter-based Diesel Generator Emulator for Voltage and Frequency Control Studies in Laboratory-Scale Microgrids. Iranian Journal of Science and Technology, Transactions of Electrical Engineering. 2021; ():1-13.
Chicago/Turabian StyleM. S. Mahdavi; G. B. Gharehpetian; Ali Ghasemi. 2021. "An Enhanced Converter-based Diesel Generator Emulator for Voltage and Frequency Control Studies in Laboratory-Scale Microgrids." Iranian Journal of Science and Technology, Transactions of Electrical Engineering , no. : 1-13.
Insufficient inertia is the paramount challenge in power system transition toward $ 100\%$ converter-based generation. A promising solution to this issue is utilizing distributed virtual inertia (DVI) concept, i.e., releasing energy stored in the dc-link capacitors of power converters employed in the grid following a frequency disturbance. Nevertheless, this method has two drawbacks: $ 1$ ) the dc-link voltage is not reverted to its reference value after the power mismatch between generation and demand, and $ 2$ ) it yields instability of a local mode associated with the control system when the converter operates in weak grids. To overcome the aforesaid problems, the conventional DVI loop is modified so as not to affect the outer loop voltage regulator after transient. Moreover, an efficient compensator is presented in this article which eliminates the adverse impact of DVI technique on the converter stability in weak grid connections. The efficacy of proposed control scheme is depicted by simulations in MATLAB. The results illustrate that an improvement of $ 23\%$ is evident in the grid frequency rate of change following a frequency contingency collated with the case in which the DVI loop staying nullified.
Meysam Saeedian; Bahram Pournazarian; Shamsodin Taheri; Edris Pouresmaeil. Provision of Synthetic Inertia Support for Converter-Dominated Weak Grids. IEEE Systems Journal 2021, PP, 1 -10.
AMA StyleMeysam Saeedian, Bahram Pournazarian, Shamsodin Taheri, Edris Pouresmaeil. Provision of Synthetic Inertia Support for Converter-Dominated Weak Grids. IEEE Systems Journal. 2021; PP (99):1-10.
Chicago/Turabian StyleMeysam Saeedian; Bahram Pournazarian; Shamsodin Taheri; Edris Pouresmaeil. 2021. "Provision of Synthetic Inertia Support for Converter-Dominated Weak Grids." IEEE Systems Journal PP, no. 99: 1-10.
Inherent nonlinearities and uncertainties are inseparable parts of the real-life engineering systems, which make theoretical analyzes and control system designs more challenging. Usually, most of the physical parts in control systems such as controllers and actuators are subjected to saturation. On the other hand, uncertainties are ubiquitous in the physical systems, which demand some necessities in the design of the control system. Additionally, unreliability in communication networks is another practical constraint in multiagent systems, which is required to be considered. In this article, based on the mentioned issues, a distributed robust algorithm is proposed for the semiglobal stabilization of the voltage and frequency of isolated (islanded) ac microgrids considering parameters uncertainties, static nonlinearity of actuators, and unreliability in the communication network. In this regard, by employing an adaptive low-gain feedback protocol, the robust performance of the closed-loop system is guaranteed. Finally, to evaluate the proposed control strategy’s performance, digital time-domain simulations are carried out on a test microgrid system in MATLAB/Simulink environment, and the results are compared with several previously reported methods. Simulation results and comparison with previous works reveal the proposed method’s effectiveness and accuracy in regulating the microgrid voltage/frequency and providing accurate proportional active power sharing.
Amir Afshari; Mehdi Karrari; Hamid Reza Baghaee; Gevork B. Gharehpetian; Josep M. Guerrero. Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications: A Low-Gain Feedback Approach. IEEE Systems Journal 2021, PP, 1 -12.
AMA StyleAmir Afshari, Mehdi Karrari, Hamid Reza Baghaee, Gevork B. Gharehpetian, Josep M. Guerrero. Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications: A Low-Gain Feedback Approach. IEEE Systems Journal. 2021; PP (99):1-12.
Chicago/Turabian StyleAmir Afshari; Mehdi Karrari; Hamid Reza Baghaee; Gevork B. Gharehpetian; Josep M. Guerrero. 2021. "Robust Cooperative Control of Isolated AC Microgrids Subject to Unreliable Communications: A Low-Gain Feedback Approach." IEEE Systems Journal PP, no. 99: 1-12.
In this study, a novel method is proposed for current control (CC) of an active power filter (APF) of the aircraft power system, which is based on a fuzzy inference system (FIS). The control system is designed according to the instantaneous power theory. Two other conventional CC methods consisting of the hysteresis current control method (HCCM) and adaptive hysteresis current control method (AHCCM) are utilized in the study and their results are compared with the proposed fuzzy current control method (PFCCM). It is shown that the proposed method is more successful in eliminating harmonics without drawbacks of conventional methods such as high and variable switching frequency which hardens system design and utilization. The study is carried out in MATLAB\Simulink environment to prove the applicability of the proposed method.
Hamid Radmanesh; Gevork B. Gharehpetian. Harmonic distortion reduction of commercial airplane electrical power system using fuzzy logic based current control of active power filter. International Transactions on Electrical Energy Systems 2021, e12811 .
AMA StyleHamid Radmanesh, Gevork B. Gharehpetian. Harmonic distortion reduction of commercial airplane electrical power system using fuzzy logic based current control of active power filter. International Transactions on Electrical Energy Systems. 2021; ():e12811.
Chicago/Turabian StyleHamid Radmanesh; Gevork B. Gharehpetian. 2021. "Harmonic distortion reduction of commercial airplane electrical power system using fuzzy logic based current control of active power filter." International Transactions on Electrical Energy Systems , no. : e12811.
In this paper, the virtual synchronous generator (VSG) concept is utilized in the controller of the grid-connected dual two-level voltage source inverter (DTL VSI). First, the topology of the VSG and the DTL VSI are presented. Then, the state-space equations of the DTL VSI and the grid-connected two-level voltage source inverter (TL VSI), regarding the presence of the phase-locked loop (PLL) and the VSG, are given. Next, the small-signal modeling of the DTL VSI and the TL VSI is realized. Eventually, the stability enhancement in the DTL VSI compared with the TL VSI is demonstrated. In the TL VSI, large values of virtual inertia could result in oscillations in the power system. However, the ability of the DTL VSI in damping oscillations is deduced. Furthermore, in the presence of nonlinear loads, the potentiality of the DTL VSI in reducing grid current Total Harmonic Distortion (THD) is evaluated. Finally, by using a proper reference current command signal, the abilities of the DTL VSI and the TL VSI in supplying nonlinear loads and providing virtual inertia are assessed simultaneously. The simulation results prove the advantages of the DTL VSI compared with the TL VSI in virtual inertia emulation and oscillation damping, which are realized by small-signal analysis.
Mohammad Dashtaki; Hamed Nafisi; Amir Khorsandi; Mojgan Hojabri; Edris Pouresmaeil. Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study. Energies 2021, 14, 1160 .
AMA StyleMohammad Dashtaki, Hamed Nafisi, Amir Khorsandi, Mojgan Hojabri, Edris Pouresmaeil. Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study. Energies. 2021; 14 (4):1160.
Chicago/Turabian StyleMohammad Dashtaki; Hamed Nafisi; Amir Khorsandi; Mojgan Hojabri; Edris Pouresmaeil. 2021. "Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study." Energies 14, no. 4: 1160.
Inertia requirement is the paramount challenge in future power systems with a significant share of renewable energy generators. A promising solution to this issue is applying Distributed Virtual Inertia (DVI) concept, i.e. releasing energy preserved in the dc-link capacitors of employed power converters in the grid following a frequency disturbance. Nonetheless, small-signal stability analyses affirm that a local mode associated with the control system is prone to become unstable when the grid-interactive converter augmented with the DVI operates in weak grids. To overcome this problem, an efficient compensator is proposed in this paper. This compensator introduces one degree-of-freedom to the direct axis current controller in synchronous reference frame, which eliminates the adverse impact of DVI function on converter stability. Finally, the efficacy of the proposed control framework is depicted by simulations in MATLAB. The results illustrate that the grid frequency rate of change following a disturbance is improved by 30% compared to the case in which the DVI loop is nullified.
Meysam Saeedian; Reza Sangrody; Mahdi Shahparasti; Shamsodin Taheri; Edris Pouresmaeil. Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability. IEEE Transactions on Power Delivery 2021, PP, 1 -1.
AMA StyleMeysam Saeedian, Reza Sangrody, Mahdi Shahparasti, Shamsodin Taheri, Edris Pouresmaeil. Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability. IEEE Transactions on Power Delivery. 2021; PP (99):1-1.
Chicago/Turabian StyleMeysam Saeedian; Reza Sangrody; Mahdi Shahparasti; Shamsodin Taheri; Edris Pouresmaeil. 2021. "Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability." IEEE Transactions on Power Delivery PP, no. 99: 1-1.
Due to the growing power demands in microgrids (MGs), the necessity for parallel production achieved from distributed generations (DGs) to supply the load required by customers has been increased. Since the DGs have to procure the demand in parallel mode, they are faced with several technical and economic challenges, such as preventing DGs overloading and not losing network stability considering feeder impedance variation. This paper presents a method that upgrades the droop controller based on sliding mode approach, so that DGs are able to prepare a suitable reactive power sharing without error even in more complex MGs. In the proposed strategy, the third-order sliding mode controller significantly reduces the V-Q error and increases the accuracy in adjusting the voltage at the DG output terminals. Various case studies conducted out in this paper validate the truthfulness of the proposed method, considering the stability analysis using Lyapunov function. Finally, by comparing the control parameters of the proposed technique with existing methods, the superiority, simplicity and effectiveness of the 3rd order sliding mode control (SMC) method are determined.
Abdonaser Saleh-Ahmadi; Mazda Moattari; Amir Gahedi; Edris Pouresmaeil. Droop Method Development for Microgrids Control Considering Higher Order Sliding Mode Control Approach and Feeder Impedance Variation. Applied Sciences 2021, 11, 967 .
AMA StyleAbdonaser Saleh-Ahmadi, Mazda Moattari, Amir Gahedi, Edris Pouresmaeil. Droop Method Development for Microgrids Control Considering Higher Order Sliding Mode Control Approach and Feeder Impedance Variation. Applied Sciences. 2021; 11 (3):967.
Chicago/Turabian StyleAbdonaser Saleh-Ahmadi; Mazda Moattari; Amir Gahedi; Edris Pouresmaeil. 2021. "Droop Method Development for Microgrids Control Considering Higher Order Sliding Mode Control Approach and Feeder Impedance Variation." Applied Sciences 11, no. 3: 967.
In this paper, a bi‐level power management strategy is presented for an active distribution network (ADN) in the presence of virtual power plant (VPP). In the proposed strategy, VPP contains renewable energy source (RES), energy storage system (ESS) and electric vehicles (EVs) parking lot coordinated with VPP operator (VPPO), and there is a coordinated framework between VPPO and distribution system operator. The proposed power management strategy (PMS) is considered in the context of the bi‐level optimization problem. In the first level, the optimal harmonic power flow formulation of the ADN is considered by minimizing the summation of energy cost, voltage deviation function and voltage THD% as a normalized objective function. In the second level, the VPP is modeled according to the framework of day‐ahead energy and ancillary services markets. In the next step, the linear format of the proposed non‐linear original problem is obtained with an optimal solution and low calculation burden. Also, the Karush‐Kuhn‐Tucker condition is used to convert the proposed bi‐level PMS approach to a single‐level model, and the scenariobased stochastic programming models the uncertainty of load, energy price, RES power, and EVs demand. Finally, the proposed strategy is applied on the 33‐bus distribution network using GAMS software.
Arash Rohani; Mahyar Abasi; Arsalan Beigzadeh; Mahmood Joorabian; Gevork B. Gharehpetian. Bi‐level power management strategy in harmonic‐polluted active distribution network including virtual power plants. IET Renewable Power Generation 2021, 15, 462 -476.
AMA StyleArash Rohani, Mahyar Abasi, Arsalan Beigzadeh, Mahmood Joorabian, Gevork B. Gharehpetian. Bi‐level power management strategy in harmonic‐polluted active distribution network including virtual power plants. IET Renewable Power Generation. 2021; 15 (2):462-476.
Chicago/Turabian StyleArash Rohani; Mahyar Abasi; Arsalan Beigzadeh; Mahmood Joorabian; Gevork B. Gharehpetian. 2021. "Bi‐level power management strategy in harmonic‐polluted active distribution network including virtual power plants." IET Renewable Power Generation 15, no. 2: 462-476.
In recent years, the installation of large‐scale photovoltaic (PV) farms (LPFs) is expanding around the world. Due to the addition of LPFs to the power system and increasing their penetration level, they should be able to undertake the most common tasks of conventional power plants in coordinated with other devices in the power system. Damping of low‐frequency oscillation (LFO) through the power system stabilizers (PSSs) is regarded as one of these common tasks. Therefore, the LPF must be able to damp the LFO in coordinated with the PSSs. This paper proposes a new method for LFO damping in power system which is based on optimal coordination of wide‐area measurement‐based fractional‐order proportional‐integral‐derivative (WMFOPID) controller as an auxiliary controller for LPF and PSSs of synchronous generators. The performance evaluation of the optimal coordinated WMFOPID controller is performed in a smart two‐area power system and is compared with other controllers in terms of LFO damping. The simulation results show the better performance of the optimal coordinated WMFOPID controller compared to the uncoordinated case and determine the effectiveness of the novel proposed method for LFO damping. The results also show the high robustness of the optimal WMFOPID controller compared to previous controllers, against some uncertainties in the power system.
Mahdi Saadatmand; Babak Mozafari; Gevork B. Gharehpetian; Soodabeh Soleymani. Optimal coordinated tuning of power system stabilizers and wide‐area measurement‐based fractional‐order PID controller of large‐scale PV farms for LFO damping in smart grids. International Transactions on Electrical Energy Systems 2021, 31, 1 .
AMA StyleMahdi Saadatmand, Babak Mozafari, Gevork B. Gharehpetian, Soodabeh Soleymani. Optimal coordinated tuning of power system stabilizers and wide‐area measurement‐based fractional‐order PID controller of large‐scale PV farms for LFO damping in smart grids. International Transactions on Electrical Energy Systems. 2021; 31 (2):1.
Chicago/Turabian StyleMahdi Saadatmand; Babak Mozafari; Gevork B. Gharehpetian; Soodabeh Soleymani. 2021. "Optimal coordinated tuning of power system stabilizers and wide‐area measurement‐based fractional‐order PID controller of large‐scale PV farms for LFO damping in smart grids." International Transactions on Electrical Energy Systems 31, no. 2: 1.
The performance of a photovoltaic (PV) system is highly affected by different types of power losses which are incurred by electrical equipment or altering weather conditions. In this context, an accurate analysis of power losses for a PV system is of significant importance. Hence, the systematic calculation of the PV system power losses based on recorded data of the main electrical and meteorological parameters is investigated in this paper. The proposed approach for power losses calculation investigates both array capture losses (e.g. losses resulted from cell temperature, soiling, low irradiance, snow cover, mismatching, and module quality degradation) and system losses (e.g. losses resulted from cabling, inverter, etc.). Moreover, according to the best of our knowledge, the paper proposes for the first time in the literature the modeling of all types of losses based on computational intelligence techniques. The proposed models can predict the future daily values for each type of loss solely based on the main meteorological parameters. The proposed losses calculation approach is applied to 8 years of recorded data for a 1.44 kWp rooftop PV system located in Denver, CO. Several prediction models are built based on the calculated values of the losses. The models are not only validated on the PV system itself, but also on another PV system with different electrical characteristics in Las Vegas, NV. As the results show, the loss prediction models developed in this paper perform accurately for the main PV system and are also applicable to other PV systems.
Behzad Hashemi; Shamsodin Taheri; Ana-Maria Cretu; Edris Pouresmaeil. Systematic photovoltaic system power losses calculation and modeling using computational intelligence techniques. Applied Energy 2021, 284, 116396 .
AMA StyleBehzad Hashemi, Shamsodin Taheri, Ana-Maria Cretu, Edris Pouresmaeil. Systematic photovoltaic system power losses calculation and modeling using computational intelligence techniques. Applied Energy. 2021; 284 ():116396.
Chicago/Turabian StyleBehzad Hashemi; Shamsodin Taheri; Ana-Maria Cretu; Edris Pouresmaeil. 2021. "Systematic photovoltaic system power losses calculation and modeling using computational intelligence techniques." Applied Energy 284, no. : 116396.
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.
Nowadays, the problem of the proper charging of plug-in hybrid electric vehicles (PHEVs) has become increasingly difficult because there is high uncertainty on both the demand and supply sides of microgrid (MG) systems, which may reduce efficiency and increase the cost of MG systems. Available solutions to these challenges are the application of energy storage systems and energy exchange with the upstream utility grid (UUG). However, uncoordinated PHEV charging could have adverse effects on MGs, such as increasing the amounts of energy exchanged between the MGs and the UUG as well as decreasing the battery energy storage systems (BESSs) lifetime. This article proposes a smart charging scheme for PHEVs in ac MGs that can simultaneously minimize the energy drawn from the UUG to charge PHEVs and maximize the lifetime of BESSs based on a multiobjective optimization algorithm. For proving the validity of the proposed power management strategy (PMS), offline digital time-domain simulation studies are conducted based on the modified version of the IEEE 33-bus test system. The obtained results are compared with the results of other previously reported PMSs, which show that by increasing the output power of DER units (even when the penetration level of PHEVs increases), the proposed PMS can ensure proper charging of PHEVs while improving the lifetimes of BESSs and decreasing the energy drawn from the UUG.
Ehsan Fouladi; Hamid Reza Baghaee; Mehdi Bagheri; G. B. Gharehpetian. Smart V2G/G2V Charging Strategy for PHEVs in AC Microgrids Based on Maximizing Battery Lifetime and RER/DER Employment. IEEE Systems Journal 2020, PP, 1 -11.
AMA StyleEhsan Fouladi, Hamid Reza Baghaee, Mehdi Bagheri, G. B. Gharehpetian. Smart V2G/G2V Charging Strategy for PHEVs in AC Microgrids Based on Maximizing Battery Lifetime and RER/DER Employment. IEEE Systems Journal. 2020; PP (99):1-11.
Chicago/Turabian StyleEhsan Fouladi; Hamid Reza Baghaee; Mehdi Bagheri; G. B. Gharehpetian. 2020. "Smart V2G/G2V Charging Strategy for PHEVs in AC Microgrids Based on Maximizing Battery Lifetime and RER/DER Employment." IEEE Systems Journal PP, no. 99: 1-11.
Optimal power sharing between parallel inverters and the demand load in microgrids is challenging and particularly critical for power grids in islanding operation. This paper introduces a novel control approach for managing parallel distributed power sources in the presence of variable load in islanding regime. The proposed scheme is based on the modified sliding mode control (MSMC) which is combined with the optimal Riccati control method to achieve convergence at the slip level with higher accuracy. The mathematical principles of the network equations are derived and its stability is obtained using the Lyapunov function. The MSMC simulation results are discussed in relation to the conventional droop method, while the laboratory evaluation was carried out to characterize its dynamic and static response. The results show that the proposed scheme control is able to manage the distributed power generation for static and dynamic load scenarios, and as such, guarantying microgrid frequency stability.
Ehsan Baneshi; Hasan Kolahduzloo; Javad Ebrahimi; Mehrdad Mahmoudian; Edris Pouresmaeil; Eduardo Rodrigues. Coordinated Power Sharing in Islanding Microgrids for Parallel Distributed Generations. Electronics 2020, 9, 1927 .
AMA StyleEhsan Baneshi, Hasan Kolahduzloo, Javad Ebrahimi, Mehrdad Mahmoudian, Edris Pouresmaeil, Eduardo Rodrigues. Coordinated Power Sharing in Islanding Microgrids for Parallel Distributed Generations. Electronics. 2020; 9 (11):1927.
Chicago/Turabian StyleEhsan Baneshi; Hasan Kolahduzloo; Javad Ebrahimi; Mehrdad Mahmoudian; Edris Pouresmaeil; Eduardo Rodrigues. 2020. "Coordinated Power Sharing in Islanding Microgrids for Parallel Distributed Generations." Electronics 9, no. 11: 1927.
The transition from conventional generation to renewable energy sources (RES) motivated the energy sectors to focus on the microgrid (MG) concept. The stable operation of a microgrid is affected by multiple agents and parameters such as controllers, loads, lines, phase locked loop (PLL), and virtual impedances (VI). The virtual impedances (VI) was introduced to correct the impedance mismatches and subsequent performance characteristics in a MG. The effect of VI on MG stability is significant and should be analyzed thoroughly. This paper firstly draws the MG dynamic model including PLL, VI, current feedback coefficient (F) and induction machinery (IM). Then the non-linear dynamic equations are linearized around an operating point. Finally, the eigenvalues analysis is applied to evaluate the small-signal stability of islanded MG while the induction machinery (IM) and ideal resistive-inductive loads are installed at the MG, simultaneously. The permissible intervals for MG parameters are drawn from the MG stability point of view which is a useful procedure to control the MG effectively and inside a stable region of operation.
Bahram Pournazarian; Maysam Saeedian; Bahman Eskandari; Matti Lehtonen; Edris Pouresmaeil. Feasible Ranges of Microgrid Parameters Based on Small-signal Stability Analysis. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) 2020, 1 -6.
AMA StyleBahram Pournazarian, Maysam Saeedian, Bahman Eskandari, Matti Lehtonen, Edris Pouresmaeil. Feasible Ranges of Microgrid Parameters Based on Small-signal Stability Analysis. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). 2020; ():1-6.
Chicago/Turabian StyleBahram Pournazarian; Maysam Saeedian; Bahman Eskandari; Matti Lehtonen; Edris Pouresmaeil. 2020. "Feasible Ranges of Microgrid Parameters Based on Small-signal Stability Analysis." 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) , no. : 1-6.
Power synchronization control (PSC) has a promising potential to be used in interface converters of large- scale renewable generations operating under weak-grid condition. This paper presents a modified PSC-based control structure that provides an enhanced dynamic response, reinforced synchronization, and reduced vulnerability against grid transients. By utilizing a back-calculation scheme, the active power reference in the synchronization loop of PSC is configured to be adapted to the grid transients for avoiding loss of synchronization (LOS). Furthermore, the proposed control structure prevents power-injection collapse (PIC) and mitigates the dc current components of the converter caused by transients in weak grids. Performance and feasibility of the proposed control structure are highlighted and verified by simulation of various scenarios and operating conditions.
Amir Sepehr; Mobina Pouresmaeil; Mojgan Hojabri; Frede Blaabjerg; Edris Pouresmaeil. Improving Transient Stability of Power Synchronization Control for Weak Grid Applications. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) 2020, 1 -6.
AMA StyleAmir Sepehr, Mobina Pouresmaeil, Mojgan Hojabri, Frede Blaabjerg, Edris Pouresmaeil. Improving Transient Stability of Power Synchronization Control for Weak Grid Applications. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). 2020; ():1-6.
Chicago/Turabian StyleAmir Sepehr; Mobina Pouresmaeil; Mojgan Hojabri; Frede Blaabjerg; Edris Pouresmaeil. 2020. "Improving Transient Stability of Power Synchronization Control for Weak Grid Applications." 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) , no. : 1-6.
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.
The growth of environmental awareness and more robust enforcement of numerous regulations to reduce greenhouse gas (GHG) emissions have directed efforts towards addressing current environmental challenges. Considering the Vehicle Routing Problem (VRP), one of the effective strategies to control greenhouse gas emissions is to convert the fossil fuel-powered fleet into Environmentally Friendly Vehicles (EFVs). Given the multitude of constraints and assumptions defined for different types of VRPs, as well as assumptions and operational constraints specific to each type of EFV, many variants of environmentally friendly VRPs (EF-VRP) have been introduced. In this paper, studies conducted on the subject of EF-VRP are reviewed, considering all the road transport EFV types and problem variants, and classifying and discussing with a single holistic vision. The aim of this paper is twofold. First, it determines a classification of EF-VRP studies based on different types of EFVs, i.e., Alternative-Fuel Vehicles (AFVs), Electric Vehicles (EVs) and Hybrid Vehicles (HVs). Second, it presents a comprehensive survey by considering each variant of the classification, technical constraints and solution methods arising in the literature. The results of this paper show that studies on EF-VRP are relatively novel and there is still room for large improvements in several areas. So, to determine future insights, for each classification of EF-VRP studies, the paper provides the literature gaps and future research needs.
Erfan Ghorbani; Mahdi Alinaghian; Gevork. Gharehpetian; Sajad Mohammadi; Guido Perboli. A Survey on Environmentally Friendly Vehicle Routing Problem and a Proposal of Its Classification. Sustainability 2020, 12, 9079 .
AMA StyleErfan Ghorbani, Mahdi Alinaghian, Gevork. Gharehpetian, Sajad Mohammadi, Guido Perboli. A Survey on Environmentally Friendly Vehicle Routing Problem and a Proposal of Its Classification. Sustainability. 2020; 12 (21):9079.
Chicago/Turabian StyleErfan Ghorbani; Mahdi Alinaghian; Gevork. Gharehpetian; Sajad Mohammadi; Guido Perboli. 2020. "A Survey on Environmentally Friendly Vehicle Routing Problem and a Proposal of Its Classification." Sustainability 12, no. 21: 9079.