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Kazem Mazlumi was born in Tehran, Iran, in 1976. He received the B.Sc. degree in electrical engineering from the Amirkabir University of Technology, Tehran, in 2000, the M.Sc. degree from the Sharif University of Technology, Tehran, in 2003, and the Ph.D. degree from the Amirkabir University of Technology in 2009. He is currently an Associate Professor with the University of Zanjan, Zanjan, Iran and member of IEEE. His research interests include power system protection and smart power grids.
This paper develops a novel methodology to apply the piece-wise linear characteristic (PWLC) to coordinate the digital overcurrent relays (DOCRs) in meshed power systems regardless of their scales. In this approach, first, a table based on maximum short-circuit fault currents obtained using DIgSILENT software is produced in which the current seen by each relay is recorded by implementing a three-phase fault in front of other relays. Then, based on the fault currents achieved, the PWLC of each relay begins from the maximum short-circuit fault current in front of it and extends toward the lower fault currents. The proposed approach is tested on three different networks, namely the distribution portion of the IEEE 14-bus, the IEEE 8-bus, and the IEEE 39-bus test systems. The simulation results show that the proposed method can be easily implemented on any power network irrespective of the network size. The viability of the proposed scheme in terms of operating time, miscoordination cases, and flexibility is compared with the other standard and nonstandard characteristic curves available in the literature. The comparative study demonstrates a notable reduction in total relays’ operating time. The operating time difference between main and backup relays is also remarkably decreased. Since the number of line segments of the PWLC characteristic and their relevant slope and time delay can be defined arbitrarily, more flexible and desirable approach for the overcurrent protection coordination problem is achieved compared to other NSCs.
Mehdi Azari; Kazem Mazlumi; Mansour Ojaghi. Optimal Directional Overcurrent Relay Coordination in Interconnected Networks Considering User-Defined PWL Characteristic Curve. Arabian Journal for Science and Engineering 2021, 1 -21.
AMA StyleMehdi Azari, Kazem Mazlumi, Mansour Ojaghi. Optimal Directional Overcurrent Relay Coordination in Interconnected Networks Considering User-Defined PWL Characteristic Curve. Arabian Journal for Science and Engineering. 2021; ():1-21.
Chicago/Turabian StyleMehdi Azari; Kazem Mazlumi; Mansour Ojaghi. 2021. "Optimal Directional Overcurrent Relay Coordination in Interconnected Networks Considering User-Defined PWL Characteristic Curve." Arabian Journal for Science and Engineering , no. : 1-21.
Distribution transformers (DTs) are deemed as one of the major and high-priced equipment of electrical grids and their destruction negatively affects the stability and security of the network. The insulation status of the transformer depends on the hotspot and oil temperatures. Accordingly, controlling and, if possible, reduction of transformer oil temperature will improve the insulation status. In this paper, the effect of using nano-oil on oil temperature and loading capacity increment (LCI) of DTs has been studied via the electro-thermal resistance model (E-TRM). The studied nanofluids are two volumetric concentrations of multi-walled carbon nanotubes (MWCNTs) and three volumetric concentrations of diamond nanoparticles dispersed in pure mineral oil (MO). First, the numerical results gained from the E-TRM method are compared and verified with the experiential results of a 500 kVA DT. As well as, the effect of using MWCNT, diamond and proposed ONF nanoparticles in the heat transfer capacity of the transformer are investigated and compared. The results demonstrate that the highest temperature reduction in comparison with MO among the studied nanofluids is about 1 °C and for nanofluid ODI2. While the use of hypothetical ONF nanofluid reduces the oil temperature by 2.7 °C. Finally, the LCI of DTs caused by the use of nanofluids is investigated by the proposed novel equation. The use of nanofluids, especially the proposed ONF nanofluid, leads to the LCI up to 5%.
Ali Asghar Taheri; Ali Abdali; Mohammad Taghilou; Hassan Haes Alhelou; Kazem Mazlumi. Investigation of Mineral Oil-Based Nanofluids Effect on Oil Temperature Reduction and Loading Capacity Increment of Distribution Transformers. Energy Reports 2021, 7, 4325 -4334.
AMA StyleAli Asghar Taheri, Ali Abdali, Mohammad Taghilou, Hassan Haes Alhelou, Kazem Mazlumi. Investigation of Mineral Oil-Based Nanofluids Effect on Oil Temperature Reduction and Loading Capacity Increment of Distribution Transformers. Energy Reports. 2021; 7 ():4325-4334.
Chicago/Turabian StyleAli Asghar Taheri; Ali Abdali; Mohammad Taghilou; Hassan Haes Alhelou; Kazem Mazlumi. 2021. "Investigation of Mineral Oil-Based Nanofluids Effect on Oil Temperature Reduction and Loading Capacity Increment of Distribution Transformers." Energy Reports 7, no. : 4325-4334.
Photovoltaic is one of the renewable energies in generating electricity. The MPPT as effective technique can improve the performance of photovoltaic cells. Key problem in photovoltaic systems is that it does not achieve much power since the various weather conditions effects on photovoltaic power cells in working such as solar radiation or rainy and cloudy weather. Therefore, the MPPT in PV cells runs and leads to change during the day and seasons. On the other hand, providing an appropriate controller for the MPPT is too important. Here, main purpose is applying the robust controller, which is tuned by firefly algorithm to optimize MPPT in photovoltaic systems. The main reason to propose this method is some defects in previous controllers such as low stability, low battery lifetime, inability to combine AC/DC and low efficiency. The suggested model is performed by MATLAB/Simulink software. Finally, the FLFA model has higher efficiency and best dynamic response than other methods.
Ali Abdali; Kazem Mazlumi. AC/DC robust controller technique for reliable operation of photovoltaic-based microgrid using firefly algorithm and fuzzy logic. International Journal of Emerging Electric Power Systems 2021, 22, 451 -462.
AMA StyleAli Abdali, Kazem Mazlumi. AC/DC robust controller technique for reliable operation of photovoltaic-based microgrid using firefly algorithm and fuzzy logic. International Journal of Emerging Electric Power Systems. 2021; 22 (4):451-462.
Chicago/Turabian StyleAli Abdali; Kazem Mazlumi. 2021. "AC/DC robust controller technique for reliable operation of photovoltaic-based microgrid using firefly algorithm and fuzzy logic." International Journal of Emerging Electric Power Systems 22, no. 4: 451-462.
Direct current (dc) microgrids have gained significant interest in research due to dc generation/storage technologies—such as photovoltaics (PV) and batteries—increasing performance and reducing in cost. However, proper protection and control systems are critical in order to make dc microgrids feasible. This paper aims to propose a novel integrated control and protection scheme by using the state-dependent Riccati equation (SDRE) method for PV-battery based islanded dc microgrids. The dc microgrid under study consists of photovoltaic (PV) generation, a battery energy storage system (BESS), a capacitor bank and a dc load. The aims of this study are fast fault detection and voltage control of the dc load bus. To do so, the SDRE observer-controller—a nonlinear mathematical model—is employed to model the operation of the dc microgrid. Simulation results show that the proposed SDRE method is effective for fault detection and robust against external disturbances, resulting in it being capable of controlling the dc load bus voltage during disturbances. Finally, the dc microgrid and its proposed protection scheme are implemented in an experimental testbed prototype to verify the fault detection algorithm feasibility. The experimental results indicate that the SDRE scheme can effectively detect faults in a few milliseconds.
Ali Abdali; Kazem Mazlumi; Josep M. Guerrero. Integrated Control and Protection Architecture for Islanded PV-Battery DC Microgrids: Design, Analysis and Experimental Verification. Applied Sciences 2020, 10, 8847 .
AMA StyleAli Abdali, Kazem Mazlumi, Josep M. Guerrero. Integrated Control and Protection Architecture for Islanded PV-Battery DC Microgrids: Design, Analysis and Experimental Verification. Applied Sciences. 2020; 10 (24):8847.
Chicago/Turabian StyleAli Abdali; Kazem Mazlumi; Josep M. Guerrero. 2020. "Integrated Control and Protection Architecture for Islanded PV-Battery DC Microgrids: Design, Analysis and Experimental Verification." Applied Sciences 10, no. 24: 8847.
Technological developments in protective devices have established the basis for appearance of numerical overcurrent relays (OCRs), which enable the users to apply their desired time-current characteristics (TCCs). This study propounds novel stepwise and combined stepwise–piece-wise linear TCCs and presents clear procedure to utilise them for coordinating OCRs in large meshed power systems. The TCCs keep constant time interval between the main/backup relay pairs within entire fault current range. They are examined first by coordinating the OCRs in a 4-bus power system and by coordinating the ground fault OCRs in a practical 60 kV looped power system. Then, the OCRs of the IEEE 14-bus test system, which is a rather large meshed power system with 39 OCRs and 102 main/backup pairs, are coordinated by using the novel TCCs. The same relays in the aforesaid power systems are coordinated using some non-standard TCCs recently introduced in the literature. The comparison verifies that the lowest operating times are achieved by using the novel TCCs. The devised TCCs are simply formed as look-up tables to be exactly set on the existing industrial relays. This fact is verified by setting them on an industrial OCR, and then, by testing the relay through the current injection method.
Mehdi Azari; Kazem Mazlumi; Mansour Ojaghi. Novel stepwise and combined stepwise–piece‐wise linear tripping characteristics for coordinating numerical overcurrent relays. IET Generation, Transmission & Distribution 2020, 14, 3719 -3737.
AMA StyleMehdi Azari, Kazem Mazlumi, Mansour Ojaghi. Novel stepwise and combined stepwise–piece‐wise linear tripping characteristics for coordinating numerical overcurrent relays. IET Generation, Transmission & Distribution. 2020; 14 (18):3719-3737.
Chicago/Turabian StyleMehdi Azari; Kazem Mazlumi; Mansour Ojaghi. 2020. "Novel stepwise and combined stepwise–piece‐wise linear tripping characteristics for coordinating numerical overcurrent relays." IET Generation, Transmission & Distribution 14, no. 18: 3719-3737.
Microgrids are penetrating into the power systems at an unprecedented rate. The reason is the mutual economic and environmental benefits of microgrids, both for power grid utility and the consumers. Some special features of microgrids such as, the two main operational conditions called, islanded and grid-connected modes, and being composed of various types of distributed energy resources along with different uncertainties cause some tough challenges to protection and control systems. From the protection aspect, the coordination of overcurrent relays protection will become a difficulty, due to the extensive changes in the fault current levels sensed by these devices. In this paper, a new adaptive protection coordination scheme based on Self-Organizing Map (SOM) clustering algorithm is proposed for digital overcurrent relays equipped with several setting groups. Considering the similarity of mis-coordinated relay pairs for the clustering purpose, the proposed protection scheme focuses on solving the mis-coordination between main/backup relay pairs. As a case study, a modified IEEE 33-bus test system is used as a microgrid. In the case study, a synchronous distributed generation and two electric vehicle charging stations are installed. The results suggest that not only the proposed method is fully capable and flexible to significantly improve the mis-coordination of overcurrent relay pairs, but it can also ameliorate the operating time of relay.
Seyyed Mohammad Ebrahim Ghadiri; Kazem Mazlumi. Adaptive protection scheme for microgrids based on SOM clustering technique. Applied Soft Computing 2020, 88, 106062 .
AMA StyleSeyyed Mohammad Ebrahim Ghadiri, Kazem Mazlumi. Adaptive protection scheme for microgrids based on SOM clustering technique. Applied Soft Computing. 2020; 88 ():106062.
Chicago/Turabian StyleSeyyed Mohammad Ebrahim Ghadiri; Kazem Mazlumi. 2020. "Adaptive protection scheme for microgrids based on SOM clustering technique." Applied Soft Computing 88, no. : 106062.
In the present study, a new method is proposed for early voltage instability detection based on the statistical analysis of the data obtained from PMUs and micro-PMUs. Although, the use of high sampling rate measurements helps operators to assess the dynamic behavior of the systems, but it may lead to processing a large volume of data, which is a main challenge in this regard. Here, K-Medoid partitioning method is used for clustering and reducing the computational burden. Clustering is done based on the analysis of the voltage magnitude variance in unstable scenarios. Based on the critical slowing down phenomenon, the voltage magnitude variance in the critical transmission-level busbars and in the power plant busbars are used as instability detection indices. The data measured by PMUs give information about severity of the events, and micro-PMUs data provide information on operating status of the over-excitation limiters as well as the resiliency of network to keep voltage. In different conditions of the Nordic test system, all contingencies are considered for data training. Efficiency of the proposed method for early detection of instability in online operation is evaluated by AdaBoost algorithm, and the obtained results are compared by those of other classifiers.
Mohsen Ghalei Monfared Zanjani; Kazem Mazlumi; Innocent Kamwa. Combined analysis of distribution‐level PMU data with transmission‐level PMU for early detection of long‐term voltage instability. IET Generation, Transmission & Distribution 2019, 13, 3634 -3641.
AMA StyleMohsen Ghalei Monfared Zanjani, Kazem Mazlumi, Innocent Kamwa. Combined analysis of distribution‐level PMU data with transmission‐level PMU for early detection of long‐term voltage instability. IET Generation, Transmission & Distribution. 2019; 13 (16):3634-3641.
Chicago/Turabian StyleMohsen Ghalei Monfared Zanjani; Kazem Mazlumi; Innocent Kamwa. 2019. "Combined analysis of distribution‐level PMU data with transmission‐level PMU for early detection of long‐term voltage instability." IET Generation, Transmission & Distribution 13, no. 16: 3634-3641.
Arash Shabani; Kazem Mazlumi. Evaluation of a Communication-Assisted Overcurrent Protection Scheme for Photovoltaic-Based DC Microgrid. IEEE Transactions on Smart Grid 2019, 11, 429 -439.
AMA StyleArash Shabani, Kazem Mazlumi. Evaluation of a Communication-Assisted Overcurrent Protection Scheme for Photovoltaic-Based DC Microgrid. IEEE Transactions on Smart Grid. 2019; 11 (1):429-439.
Chicago/Turabian StyleArash Shabani; Kazem Mazlumi. 2019. "Evaluation of a Communication-Assisted Overcurrent Protection Scheme for Photovoltaic-Based DC Microgrid." IEEE Transactions on Smart Grid 11, no. 1: 429-439.
This paper presents a novel method to mitigate the overvoltage transients caused by the circuit breaker operation in the low voltage DC (LVDC) systems. This method is based on using the existing supercapacitor energy storage system (ESS) in the DC grids to limit the switching overvoltage within the standard range. The supercapacitor sizing is performed with considering instability problems of the constant power loads (CPLs) and the boundary between underdamped and overdamped modes. Firstly, a simplified DC system is considered and the analytical expressions are presented to determine the boundary values of the supercapacitor. Effects of the system parameters on the allowable range of the supercapacitor are also discussed. Then, an approach is introduced to determine the boundary values of the supercapacitor for more detailed models of the LVDC systems. This approach applies SimPowerSystems and Control System Toolbox of the MATLAB software. Finally, the effectiveness of the proposed method is verified using simulation.
Arash Shabani; Kazem Mazlumi. A Method Based on A Supercapacitor Energy Storage System to Overcome the Switching Overvoltage in LVDC Systems with Constant Power Loads. International Journal of Emerging Electric Power Systems 2019, 20, 1 .
AMA StyleArash Shabani, Kazem Mazlumi. A Method Based on A Supercapacitor Energy Storage System to Overcome the Switching Overvoltage in LVDC Systems with Constant Power Loads. International Journal of Emerging Electric Power Systems. 2019; 20 (3):1.
Chicago/Turabian StyleArash Shabani; Kazem Mazlumi. 2019. "A Method Based on A Supercapacitor Energy Storage System to Overcome the Switching Overvoltage in LVDC Systems with Constant Power Loads." International Journal of Emerging Electric Power Systems 20, no. 3: 1.
This paper presents a new protection method for LVDC ring-bus microgrid systems based on Multi-Criterion System (MCS) and Neural Network (NN). The proposed method aimed at high-speed detecting line-to-ground (LG) and line-to-line (LL) low impedance faults without using a definite threshold of differential current by using specific rules and multi-criterion system. MCS protection showed speed and accuracy compared to differential protection. Also, NN estimated fault location in percent of line length acceptably as a secondary controller. In order to evaluate the reliability and the enforceability of fault detection and location schemes, simulated network and protection algorithms are implemented and tested in laboratory-scale. The implementation results indicate that the MCS and NN protection scheme can consistently detect and estimate fault locations in the order of a few milliseconds. To reach this goal, a loop type LVDC microgrid with proper power electronic equipment like solid-state bidirectional breakers and the multi-level inverter is fulfilled.
Ali Abdali; Kazem Mazlumi; Reza Noroozian. High-speed fault detection and location in DC microgrids systems using Multi-Criterion System and neural network. Applied Soft Computing 2019, 79, 341 -353.
AMA StyleAli Abdali, Kazem Mazlumi, Reza Noroozian. High-speed fault detection and location in DC microgrids systems using Multi-Criterion System and neural network. Applied Soft Computing. 2019; 79 ():341-353.
Chicago/Turabian StyleAli Abdali; Kazem Mazlumi; Reza Noroozian. 2019. "High-speed fault detection and location in DC microgrids systems using Multi-Criterion System and neural network." Applied Soft Computing 79, no. : 341-353.
Directional relaying is an important feature of protective relays in situations where the fault current direction is not fixed. Many transmission networks, meshed distribution networks, and modern smart grids containing distributed generation (DG) units are examples of these situations. Subtracting voltage angle from current angle indicates the fault direction in common methods. However, this method shows inaccuracy in some special conditions. In this paper, a new method is introduced to detect the fault direction. The proposed method applies a novel criterion, which is called superimposed impedance. This criterion is derived from the instantaneous voltage and current samples in the power system and indicates the fault direction properly. The proposed method is tested on a sample network through simulating in PSCAD/EMTDC and the results are plotted in MATLAB. The simulation results show the accuracy and effectiveness of the proposed method for different types of faults in various conditions.
Vahid Tahsini; Mansour Ojaghi; Kazem Mazlumi; Sina Mohammadi. A Novel Directional Relaying Scheme Using Superimposed Impedance Approach. 2019 International Conference on Protection and Automation of Power System (IPAPS) 2019, 44 -48.
AMA StyleVahid Tahsini, Mansour Ojaghi, Kazem Mazlumi, Sina Mohammadi. A Novel Directional Relaying Scheme Using Superimposed Impedance Approach. 2019 International Conference on Protection and Automation of Power System (IPAPS). 2019; ():44-48.
Chicago/Turabian StyleVahid Tahsini; Mansour Ojaghi; Kazem Mazlumi; Sina Mohammadi. 2019. "A Novel Directional Relaying Scheme Using Superimposed Impedance Approach." 2019 International Conference on Protection and Automation of Power System (IPAPS) , no. : 44-48.
The directional overcurrent relays (DOCRs) are the most important protection devices in micro-grids which are usually coordinated based on the fixed network topology. Due to the presence of the distributed generations (DGs), the setting of these relays is a nonlinear problem which should be solved using appropriate optimization algorithms. The network topology may alter because of uncertainties such as transient and permanent faults or the operator's mistake. The uncertainty increases the number of constraints that may be violated, and this issue complicates the solution algorithm. In this paper, a new objective function and a novel hybrid method are proposed based on multi-objective optimization considering simultaneous uncertainty by the genetic algorithm (GA) and network data analysis. The aim of the new proposed method is to coordinate the DOCRs in the presence of DGs incorporating uncertainty. The proposed approach is applied to the IEEE 14-bus system including distributed generation units. The results show the effectiveness of the presented method.
Hossein Karimkhan Zand; Kazem Mazlumi; Amir Bagheri. Protection Coordination for Micro-Grids based on Multi-Objective Optimization Considering Simultaneous Uncertainty. 2019 International Conference on Protection and Automation of Power System (IPAPS) 2019, 7 -11.
AMA StyleHossein Karimkhan Zand, Kazem Mazlumi, Amir Bagheri. Protection Coordination for Micro-Grids based on Multi-Objective Optimization Considering Simultaneous Uncertainty. 2019 International Conference on Protection and Automation of Power System (IPAPS). 2019; ():7-11.
Chicago/Turabian StyleHossein Karimkhan Zand; Kazem Mazlumi; Amir Bagheri. 2019. "Protection Coordination for Micro-Grids based on Multi-Objective Optimization Considering Simultaneous Uncertainty." 2019 International Conference on Protection and Automation of Power System (IPAPS) , no. : 7-11.
This study proposes a new application of micro-phasor measurement units (µPMUs) for adaptive coordination of overcurrent relays in microgrids. Mis-coordination of overcurrent relays usually arising from the variation of relays fault current and it can cause damage to equipment of network and raise operating costs. Fault current injection and direction to microgrid are highly dependent on network uncertainties; therefore, fault current is affected by line and power plant outages. This study proposes an algorithm to detect these uncertainties in online operation. Then, microgrid overcurrent relays coordination is optimised again. Uncertainties are line and power plant outages in transmission network and microgrid side and two distinct methods are used for each. For online detection of uncertainties in the transmission side, it is assumed that a µPMU is installed between transmission network and microgrid point of common coupling; so, the topology changes such as line outage is detected by monitoring of Thevenin impedance estimation that is obtained by µPMU measurements. Uncertainties detection in a microgrid is done by signals that are sent by µPMUs and installed all over the microgrid. All data are gathered and analysed in phasor data concentrators and then overcurrent relays coordination is updated with such changes.
Mohsen Ghalei Monfared Zanjani; Kazem Mazlumi; Innocent Kamwa. Application of μPMUs for adaptive protection of overcurrent relays in microgrids. IET Generation, Transmission & Distribution 2018, 12, 4061 -4068.
AMA StyleMohsen Ghalei Monfared Zanjani, Kazem Mazlumi, Innocent Kamwa. Application of μPMUs for adaptive protection of overcurrent relays in microgrids. IET Generation, Transmission & Distribution. 2018; 12 (18):4061-4068.
Chicago/Turabian StyleMohsen Ghalei Monfared Zanjani; Kazem Mazlumi; Innocent Kamwa. 2018. "Application of μPMUs for adaptive protection of overcurrent relays in microgrids." IET Generation, Transmission & Distribution 12, no. 18: 4061-4068.
This paper proposes a novel simultaneous control interface and protection scheme for DC microgrids (DCµG) interconnected systems, although the interconnections could be possible via two power electronic systems such as DC/DC converter. Each DCµG presented in this paper is supplied by AC grid as well as battery bank unit, distributed generation (DG) unit and AC load unit. The proposed control interface is based on a developed suitable small signal model for each DCµG that provides proper power flow control and cancellation of interactions between DCµG. Also, the presented protection scheme for fast fault detection in DC link is based on fuzzy inference system (FIS), so that faults could be detected as quickly as possible in few milliseconds. In fact, the aim of this paper is simultaneous protection and control interface for DC multi microgrids, so that the performance of the controller and protection system is separate, yet integrated together. As such, DC multi microgrid performance under different events, such as change in active power of DGs and short circuit is not in trouble and disorder. Simulation results indicate the remarkable effectiveness of the proposed control interface and protection scheme for DCµG interconnected systems. For validation of the capability and feasibility of FIS fault detection scheme, simulated network and protection algorithm are implemented in laboratory-scale. The implementation results demonstrate that FIS protection scheme can swiftly detect faults within a few milliseconds.
Ali Abdali; Reza Noroozian; Kazem Mazlumi. Simultaneous control and protection schemes for DC multi microgrids systems. International Journal of Electrical Power & Energy Systems 2018, 104, 230 -245.
AMA StyleAli Abdali, Reza Noroozian, Kazem Mazlumi. Simultaneous control and protection schemes for DC multi microgrids systems. International Journal of Electrical Power & Energy Systems. 2018; 104 ():230-245.
Chicago/Turabian StyleAli Abdali; Reza Noroozian; Kazem Mazlumi. 2018. "Simultaneous control and protection schemes for DC multi microgrids systems." International Journal of Electrical Power & Energy Systems 104, no. : 230-245.
Low-voltage DC (LVDC) systems may soon become an integral part of our electric grid. Faults on DC lines are usually pole-to-ground faults that depend on the grounding arrangement of the DC system. The grounding of the LVDC system is not adequately covered in the literature and there is no comprehensive standard for it. This paper studies the effect of various grounding arrangements of the LVDC system on pole-to-ground fault protection. An overall scheme of the LVDC system is modeled and a pole-to-ground fault is placed on the DC lines. Possible grounding arrangements are analyzed employing MATLAB/Simulink software and detailed discussion is given for each arrangement. Finally, simulation results are compared and a preferred grounding arrangement is selected with the objective of having selective and effective protection without device damage.
Arash Shabani; Kazem Mazlumi. Studying grounding arrangements of the LVDC system through simulation. SIMULATION 2018, 94, 441 -449.
AMA StyleArash Shabani, Kazem Mazlumi. Studying grounding arrangements of the LVDC system through simulation. SIMULATION. 2018; 94 (5):441-449.
Chicago/Turabian StyleArash Shabani; Kazem Mazlumi. 2018. "Studying grounding arrangements of the LVDC system through simulation." SIMULATION 94, no. 5: 441-449.
Mojtaba Gilvanejad; Hossein Askarian Abyaneh; Kazem Mazlumi. A methodology to include real-life failure data in the failure rate estimation of power distribution systems. TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 2017, 25, 1082 -1094.
AMA StyleMojtaba Gilvanejad, Hossein Askarian Abyaneh, Kazem Mazlumi. A methodology to include real-life failure data in the failure rate estimation of power distribution systems. TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES. 2017; 25 ():1082-1094.
Chicago/Turabian StyleMojtaba Gilvanejad; Hossein Askarian Abyaneh; Kazem Mazlumi. 2017. "A methodology to include real-life failure data in the failure rate estimation of power distribution systems." TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 25, no. : 1082-1094.
M. Azari; M. Ojaghi; K. Mazlumi. An Enhanced Adaptive Algorithm to Mitigate Mis-coordination Problem of the Third Zone of Distance Relays. Journal of Applied Research and Technology 2015, 13, 87 -96.
AMA StyleM. Azari, M. Ojaghi, K. Mazlumi. An Enhanced Adaptive Algorithm to Mitigate Mis-coordination Problem of the Third Zone of Distance Relays. Journal of Applied Research and Technology. 2015; 13 (1):87-96.
Chicago/Turabian StyleM. Azari; M. Ojaghi; K. Mazlumi. 2015. "An Enhanced Adaptive Algorithm to Mitigate Mis-coordination Problem of the Third Zone of Distance Relays." Journal of Applied Research and Technology 13, no. 1: 87-96.
In this paper, a novel hybrid method based on discrete wavelet transform (DWT) and cross-correlation function (CCF) is proposed for the differential protection of the power transformers. The key idea of using the wavelet transform is the existence of high-frequency components in the inrush currents which can be extracted by means of DWT. This method is noise sensitive and may not easily be trusted; therefore, in this paper, CCF is used to reduce the sensitivity to noise. Since transformers are generally operated near the knee point of the magnetizing characteristic, only a small increase in core flux above normal operating levels results in a high magnetizing current; that is why the inrush currents are not similar to a sine wave. Therefore, in this paper, the CCF is used to measure the similarity between differential current and a reference sinusoidal 60Hz signal. The standard deviation of the wavelet transform and the maximum of the CCF are also reported. In addition, the effect of the noise on the proposed method is investigated. In the proposed method, the fault currents can be distinguished from the inrush current by setting a proper threshold. This method is verified using MATLAB/Simulink software.
Sied Mohsen Hosseini; Kazem Mazlumi. A New Hybrid Method Based on Discrete Wavelet Transform and Cross-Correlation Function to Discriminate Internal Faults from Inrush Currents. Arabian Journal for Science and Engineering 2014, 39, 7159 -7172.
AMA StyleSied Mohsen Hosseini, Kazem Mazlumi. A New Hybrid Method Based on Discrete Wavelet Transform and Cross-Correlation Function to Discriminate Internal Faults from Inrush Currents. Arabian Journal for Science and Engineering. 2014; 39 (10):7159-7172.
Chicago/Turabian StyleSied Mohsen Hosseini; Kazem Mazlumi. 2014. "A New Hybrid Method Based on Discrete Wavelet Transform and Cross-Correlation Function to Discriminate Internal Faults from Inrush Currents." Arabian Journal for Science and Engineering 39, no. 10: 7159-7172.
A novel strategy for directional overcurrent relays (DOCRs) coordination is proposed. In the proposed method, the objective function is improved during the optimization process and objective function coefficients are changed in optimization problem. The proposed objective function is more flexible than the old objective functions because various coefficients of objective function are set by optimization algorithm. The optimization problem is solved using hybrid genetic algorithm and particle swarm optimization algorithm (HGAPSOA). This method is applied to 6-bus and 30-bus sample networks.
Seyed Hadi Mousavi Motlagh; Kazem Mazlumi. Optimal Overcurrent Relay Coordination Using Optimized Objective Function. ISRN Power Engineering 2014, 2014, 1 -10.
AMA StyleSeyed Hadi Mousavi Motlagh, Kazem Mazlumi. Optimal Overcurrent Relay Coordination Using Optimized Objective Function. ISRN Power Engineering. 2014; 2014 ():1-10.
Chicago/Turabian StyleSeyed Hadi Mousavi Motlagh; Kazem Mazlumi. 2014. "Optimal Overcurrent Relay Coordination Using Optimized Objective Function." ISRN Power Engineering 2014, no. : 1-10.
Hamed Hashemi Dezaki; Hossein Askarian-Abyaneh; Mehdi Garmrudi; Hossein Mahdinia; Kazem Mazlumi. A novel approach based on reliability sensitivity analysis to allocate protective devices. TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 2014, 22, 315 -326.
AMA StyleHamed Hashemi Dezaki, Hossein Askarian-Abyaneh, Mehdi Garmrudi, Hossein Mahdinia, Kazem Mazlumi. A novel approach based on reliability sensitivity analysis to allocate protective devices. TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES. 2014; 22 ():315-326.
Chicago/Turabian StyleHamed Hashemi Dezaki; Hossein Askarian-Abyaneh; Mehdi Garmrudi; Hossein Mahdinia; Kazem Mazlumi. 2014. "A novel approach based on reliability sensitivity analysis to allocate protective devices." TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 22, no. : 315-326.