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Dr. Mazaher Karimi
School of Technology and Innovations, University of Vaasa, Wolffintie 34, FI-65200 Vaasa, Finland

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Research Keywords & Expertise

0 Distributed Generation
0 microgrid
0 Islanding detection
0 power system stability and control
0 Inverter-based generation

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Journal article
Published: 03 July 2021 in Electric Power Systems Research
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Short-circuit fault detection and classification in high-voltage direct-current (HVDC) electric power transmission lines are necessary for rapid location and removal of faults, as well as for recovering all or part of the power transmission capacity. In this study, a new and efficient technique is designed for protecting current-source converter-based HVDC (CSC-HVDC) lines. In this proposed method, new features considering the moving average and maximum coordinate difference criteria are extracted from local voltage and current signals measured with a relatively low sampling rate at the rectifier side. These extracted features provide excellent recognition to distinguish the external and internal short-circuit faults. The multiclass support vector machine model is also used to detect and classify different short-circuit faults in real-time operation. The comprehensive tests on a CSC-HVDC system verify the suggested protection strategy's high accuracy and dependability even under the circumstances not considered in the initial preparing and training stage. These results also authenticate the designed scheme's stability against external faults and lightning strikes, low sensitivity to measurement noises, and excellent performance in detecting and classifying high-resistance internal faults.

ACS Style

Mohammad Farshad; Mazaher Karimi. Intelligent Protection of CSC-HVDC Lines Based on Moving Average and Maximum Coordinate Difference Criteria. Electric Power Systems Research 2021, 199, 107439 .

AMA Style

Mohammad Farshad, Mazaher Karimi. Intelligent Protection of CSC-HVDC Lines Based on Moving Average and Maximum Coordinate Difference Criteria. Electric Power Systems Research. 2021; 199 ():107439.

Chicago/Turabian Style

Mohammad Farshad; Mazaher Karimi. 2021. "Intelligent Protection of CSC-HVDC Lines Based on Moving Average and Maximum Coordinate Difference Criteria." Electric Power Systems Research 199, no. : 107439.

Journal article
Published: 29 December 2020 in Energies
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This article proposes a new passive islanding detection technique for inverter-based distributed generation (DG) in microgrids based on local synchrophasor measurements. The proposed method utilizes the voltage and current phasors measured at the DG connection point (point of connection, PoC). In this paper, the rate of change of voltages and the ratio of the voltage and current magnitudes (VoI index) at the PoC are monitored using micro-phasor measurement units. The developed local measurements based decentralized islanding detection technique is based on the VoI index in order to detect any kind of utility grid frequency fluctuations or oscillations and distinguishing them from islanding condition. The simulation studies confirm that the proposed scheme is accurate, robust, fast, and simple to implement for inverter-based DGs.

ACS Style

Mazaher Karimi; Mohammad Farshad; Qiteng Hong; Hannu Laaksonen; Kimmo Kauhaniemi. An Islanding Detection Technique for Inverter-Based Distributed Generation in Microgrids. Energies 2020, 14, 130 .

AMA Style

Mazaher Karimi, Mohammad Farshad, Qiteng Hong, Hannu Laaksonen, Kimmo Kauhaniemi. An Islanding Detection Technique for Inverter-Based Distributed Generation in Microgrids. Energies. 2020; 14 (1):130.

Chicago/Turabian Style

Mazaher Karimi; Mohammad Farshad; Qiteng Hong; Hannu Laaksonen; Kimmo Kauhaniemi. 2020. "An Islanding Detection Technique for Inverter-Based Distributed Generation in Microgrids." Energies 14, no. 1: 130.

Journal article
Published: 01 March 2018 in International Journal of Electrical Power & Energy Systems
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ACS Style

Shivashankar Sukumar; Hazlie Mokhlis; Saad Mekhilef; M. Karimi; Safdar Raza. Ramp-rate control approach based on dynamic smoothing parameter to mitigate solar PV output fluctuations. International Journal of Electrical Power & Energy Systems 2018, 96, 296 -305.

AMA Style

Shivashankar Sukumar, Hazlie Mokhlis, Saad Mekhilef, M. Karimi, Safdar Raza. Ramp-rate control approach based on dynamic smoothing parameter to mitigate solar PV output fluctuations. International Journal of Electrical Power & Energy Systems. 2018; 96 ():296-305.

Chicago/Turabian Style

Shivashankar Sukumar; Hazlie Mokhlis; Saad Mekhilef; M. Karimi; Safdar Raza. 2018. "Ramp-rate control approach based on dynamic smoothing parameter to mitigate solar PV output fluctuations." International Journal of Electrical Power & Energy Systems 96, no. : 296-305.

Journal article
Published: 01 September 2014 in International Journal of Electrical Power & Energy Systems
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ACS Style

A. Shahriari; H. Mokhlis; M. Karimi; A.H.A. Bakar; H.A. Illias. Quadratic Discriminant Index for Optimal Multiplier Load Flow Method in ill conditioned system. International Journal of Electrical Power & Energy Systems 2014, 60, 378 -388.

AMA Style

A. Shahriari, H. Mokhlis, M. Karimi, A.H.A. Bakar, H.A. Illias. Quadratic Discriminant Index for Optimal Multiplier Load Flow Method in ill conditioned system. International Journal of Electrical Power & Energy Systems. 2014; 60 ():378-388.

Chicago/Turabian Style

A. Shahriari; H. Mokhlis; M. Karimi; A.H.A. Bakar; H.A. Illias. 2014. "Quadratic Discriminant Index for Optimal Multiplier Load Flow Method in ill conditioned system." International Journal of Electrical Power & Energy Systems 60, no. : 378-388.

Conference paper
Published: 01 January 2014 in 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014
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Inspec keywords: load shedding; power system stability; photovoltaic power systems; distribution networks; hydroelectric generators Subjects: Power system management, operation and economics; a.c. machines; Hydroelectric power stations and plants; Distribution networks; Solar power stations and photovoltaic power systems

ACS Style

N.A. Yusof; H. Mokhlis; J.A. Laghari; M. Karimi; H.A. Illias; N.M. Sapari. Under-Voltage Load Shedding Scheme Based on Voltage Stability Index for Distribution Network. 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014 2014, 23 (5 .) -23 (5 .).

AMA Style

N.A. Yusof, H. Mokhlis, J.A. Laghari, M. Karimi, H.A. Illias, N.M. Sapari. Under-Voltage Load Shedding Scheme Based on Voltage Stability Index for Distribution Network. 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014. 2014; ():23 (5 .)-23 (5 .).

Chicago/Turabian Style

N.A. Yusof; H. Mokhlis; J.A. Laghari; M. Karimi; H.A. Illias; N.M. Sapari. 2014. "Under-Voltage Load Shedding Scheme Based on Voltage Stability Index for Distribution Network." 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014 , no. : 23 (5 .)-23 (5 .).

Conference paper
Published: 01 January 2014 in 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014
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ACS Style

J.A. Laghari; A.H.A. Bakar; H. Mokhlis; A. Shahriari; M. Karimi. Artificial neural network based islanding detection technique for mini hydro type distributed generation. 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014 2014, 1 .

AMA Style

J.A. Laghari, A.H.A. Bakar, H. Mokhlis, A. Shahriari, M. Karimi. Artificial neural network based islanding detection technique for mini hydro type distributed generation. 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014. 2014; ():1.

Chicago/Turabian Style

J.A. Laghari; A.H.A. Bakar; H. Mokhlis; A. Shahriari; M. Karimi. 2014. "Artificial neural network based islanding detection technique for mini hydro type distributed generation." 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014 , no. : 1.

Journal article
Published: 31 July 2013 in International Transactions on Electrical Energy Systems
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The Step Size of the Newton Raphson Method (SSNRM) is based on the optimal multiplier that is used to determine the Multiple Load Flow Solutions (MLFS) for an ill-conditioned power system. However, the SSNRM is incapable of determining the desirable Low Voltage Solution (LVS) from the MLFS at the Maximum Loading Point (MLP), due to the fact that when the load demand increases, the LVSs moves closer to each other at the MLP. Commonly, the smallest optimal multiplier was used to calculate the LVS at the MLP under this condition. However, this paper proves the fact that using the smallest optimal multiplier to determine the most suitable LVS for the systems having multiple solutions at the MLP will not guarantee a favourable outcome. Therefore, this paper investigates the application of the properties of scalar quadratic equations (PSQE) that enhances the function of the SSNRM at the MLP. Thus, an indicator, based on PSQE, is introduced in this work, which amends the existing SSNRM for the purpose of finding the desirable LVS at the MLP. The closest optimal multiplier to the proposed indicator is selected in order to determine the desirable LVS from all possible solutions at the MLP. The proposed method has been tested on a three-bus and IEEE 30-bus systems at the MLP for verification purposes. Additionally, the continuation power flow method is also utilized in order to compare it to the proposed method for the IEEE 30-bus system at the MLP

ACS Style

H. Mokhlis; A. Shahriari; A. H. A. Bakar; H. A. Illias; M. Karimi. Improved Step Size Newton Raphson Method using quadratic equations properties in ill-conditioned power system. International Transactions on Electrical Energy Systems 2013, 24, 1323 -1342.

AMA Style

H. Mokhlis, A. Shahriari, A. H. A. Bakar, H. A. Illias, M. Karimi. Improved Step Size Newton Raphson Method using quadratic equations properties in ill-conditioned power system. International Transactions on Electrical Energy Systems. 2013; 24 (9):1323-1342.

Chicago/Turabian Style

H. Mokhlis; A. Shahriari; A. H. A. Bakar; H. A. Illias; M. Karimi. 2013. "Improved Step Size Newton Raphson Method using quadratic equations properties in ill-conditioned power system." International Transactions on Electrical Energy Systems 24, no. 9: 1323-1342.

Journal article
Published: 01 November 2012 in International Journal of Electrical Power & Energy Systems
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ACS Style

M. Karimi; H. Mohamad; H. Mokhlis; A.H.A. Bakar. Under-Frequency Load Shedding scheme for islanded distribution network connected with mini hydro. International Journal of Electrical Power & Energy Systems 2012, 42, 127 -138.

AMA Style

M. Karimi, H. Mohamad, H. Mokhlis, A.H.A. Bakar. Under-Frequency Load Shedding scheme for islanded distribution network connected with mini hydro. International Journal of Electrical Power & Energy Systems. 2012; 42 (1):127-138.

Chicago/Turabian Style

M. Karimi; H. Mohamad; H. Mokhlis; A.H.A. Bakar. 2012. "Under-Frequency Load Shedding scheme for islanded distribution network connected with mini hydro." International Journal of Electrical Power & Energy Systems 42, no. 1: 127-138.