eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-01
4
1
1
15
429
مقاله پژوهشی
Clean and Polluting DG Types Planning in Stochastic Price Conditions and DG Unit Uncertainties
برنامه ریزی واحدهای پاک و آلاینده تولید پراکنده در شرایط تصادفی قیمت و عدم قطعیت واحدهای تولید پراکنده
M. Sadeghi
mahmood.sadeghi@gmail.com
1
M. Kalantar
ad@gmail.com
2
Center of Excellence for power system automation and operation, Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
Center of Excellence for power system automation and operation, Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
This study presents a dynamic way in a DG planning problem instead of the last static or pseudo-dynamic planning point of views. A new way in modeling the DG units’ output power and the load uncertainties based on the probability rules is proposed in this paper. A sensitivity analysis on the stochastic nature of the electricity price and global fuel price is carried out through a proposed model. Six types of clean and conventional DG units are included in the planning process. The presented dynamic planning problem is solved considering encouraging and punishment functions. The imperialist competitive algorithm (ICA) as a strong evolutionary strategy is employed to solve the DG planning problem. The proposed models and the proposed problem are applied on the 9-bus and 33-bus test distribution systems. The results show a significant improvement in the total revenue of the distribution system in all of the defined scenarios.
https://joape.uma.ac.ir/article_429_31af2c8f9d36b44177d88446d37df2e3.pdf
Distributed generation
Investment time
Dynamic programming
Uncertainty
Monte Carlo simulation
eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-01
4
1
16
28
424
مقاله پژوهشی
Low Voltage Ride Through Enhancement Based on Improved Direct Power Control of DFIG under Unbalanced and Harmonically Distorted Grid Voltage
Low Voltage Ride Through Enhancement Based on Improved Direct Power Control of DFIG under Unbalanced and Harmonically Distorted Grid Voltage
Ahmadreza Nafar
ahmad.nafar70@yahoo.com
1
Gholam Reza Arab Markadeh
arab-gh@eng.sku.ac.ir
2
Amir Elahi
elahiamirsku@gmail.com
3
Reza pouraghababa
pouraghababa@yahoo.com
4
Shahrekord Univrsity
Shahrkord University
Shahrekord University
Isfahan Regional Electrical Company
In the conventional structure of the wind turbines along with the doubly-fed induction generator (DFIG), the stator is directly connected to the power grid. Therefore, voltage changes in the grid result in severe transient conditions in the stator and rotor. In cases where the changes are severe, the generator will be disconnected from the grid and consequently the grid stability will be attenuated. In this paper, a completely review of conventional methodes for DFIG control under fault conditions is done and then a series grid side converter (SGSC) with sliding mode control method is proposed to enhance the fault ride through capability and direct power control of machine. By applying this controlling strategy, the over current in the rotor and stator windings will totally be attenuated without using additional equipments like as crowbar resistance; Moreover, the DC link voltage oscillations will be attenuated to a great extent and the generator will continue operating without being disconnected from the grid. In addition, the proposed method is able to improve the direct power control of DFIG in harmonically grid voltage condition. To validate the performance of this method, the simulation results are presented under the symmetrical and asymmetrical faults and harmonically grid voltage conditions and compared with the other conventional methods.
https://joape.uma.ac.ir/article_424_3eed2c42101dc55cded4f52bbeae8c6b.pdf
DFIG
Sliding Mode Control
unbalanced grid voltage
Low Voltage Ride Through
eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-09
4
1
29
41
423
مقاله پژوهشی
Optimal emergency demand response program integrated with multi-objective dynamic economic emission dispatch problem
Optimal emergency demand response program integrated with multi-objective dynamic economic emission dispatch problem
Ehsan Dehnavi
ehsan_dehnavi70@yahoo.com
1
Hamdi Abdi,
hamdiabdi@razi.ac.ir
2
Farid Mohammadi
ifaridmohammadi@yahoo.com
3
Electrical Engineering Departments, Engineering Faculty, Razi University, Kermanshah, Iran.
Razi University (Kermanshah)
Electrical Engineering Departments, Engineering Faculty, Razi University, Kermanshah, Iran.
Nowadays, demand response programs (DRPs) play an important role in price reduction and reliability improvement. In this paper, an optimal integrated model for the emergency demand response program (EDRP) and dynamic economic emission dispatch (DEED) problem has been developed. Customer’s behavior is modeled based on the price elasticity matrix (PEM) by which the level of DRP is determined for a given type of customer. Valve-point loading effect, prohibited operating zones (POZs), and the other non-linear constraints make the DEED problem into a non-convex and non-smooth multi-objective optimization problem. In the proposed model, the fuel cost and emission are minimized and the optimal incentive is determined simultaneously. The imperialist competitive algorithm (ICA) has solved the combined problem. The proposed model is applied on a ten units test system and results indicate the practical benefits of the proposed model. Finally, depending on different policies, DRPs are prioritized by using strategy success indices.
https://joape.uma.ac.ir/article_423_a3d41768d01674c53b2e23319a2aa79f.pdf
Emergency demand response program
Dynamic economic emission dispatch
Imperialist competitive algorithm
Optimal incentive
Strategy success indices
eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-01
4
1
42
53
427
مقاله پژوهشی
Multi-Stage DC-AC Converter Based on New DC-DC Converter for Energy Conversion
Multi-Stage DC-AC Converter Based on new DC-DC converter for energy conversion
Mohammadreza Banaei
m.banaei@azaruniv.ac.ir
1
Azarbaijan Shahid Madani University
This paper proposes a multi-stage power generation system suitable for renewable energy sources, which is composed of a DC-DC power converter and a three-phase inverter. The DC-DC power converter is a boost converter to convert the output voltage of the DC source into two voltage sources. The DC-DC converter has two switches operates like a continuous conduction mode. The input current of DC-DC converter has low ripple and voltage of semiconductors is lower than the output voltage. The three-phase inverter is a T-type inverter. This inverter requires two balance DC sources. The inverter part converts the two output voltage sources of DC-DC power converter into a five-level line to line AC voltage. Simulation results are given to show the overall system performance, including AC voltage generation. A prototype is developed and tested to verify the performance of the converter.
https://joape.uma.ac.ir/article_427_07fce5c1eaa8adada9b3e62c076eeee0.pdf
Renewable energy
multi-stage inverter
DC-DC converter
Multilevel inverter
eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-01
4
1
54
65
425
مقاله پژوهشی
An LCL-filtered Single-phase Multilevel Inverter for Grid Integration of PV Systems
An LCL-filtered Single-phase Multilevel Inverter for Grid Integration of PV Systems
Mohammad Farhadi Kangarlu
mfkangarlu@gmail.com
1
Ebrahim Babaei
e-babaei@tabrizu.ac.ir
2
Frede Blaabjerg
fbl@et.aau.dk
3
Urmia University
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
Department of Energy Technology, Aalborg University, Aalborg, Denmark
Integration of the PV into the electrical grid needs power electronic interface. This power electronic interface should have some key features and should come up with grid codes. One of the important criteria is the quality and harmonic contents of the current being injected to the grid. High-order harmonics of the grid current should be very limited (lower than 0.3% of the fundamental current). Beside the topology of the power electronic interface, the output filter also affects the quality of the grid current. In this paper, a 5-level inverter is presented for grid integration of PV systems along with its output LCL filter design. Analytical calculation of losses for the 5-level inverter and the output LCL filter is presented. It is also compared to the H-bridge inverter in terms of output voltage and current harmonics, and the overall losses. Second-order generalized integral phase locked loop is used to synchronize the system with the grid voltage and the proportional resonant (PR) with harmonic compensation control method is used to control the output current. The proposed system has been simulated in the PSCAD/EMTDC environment to verify its operation and control.
https://joape.uma.ac.ir/article_425_c04a1587d3822f2ebf3bc5a929a86618.pdf
Multilevel inverter
PV
LCL filter
MPPT
eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-01
4
1
66
82
428
مقاله پژوهشی
Control of Inverter-Interfaced Distributed Generation Units for Voltage and Current Harmonics Compensation in Grid-Connected Microgrids
Control of Inverter-Interfaced Distributed Generation Units for Voltage and Current Harmonics Compensation in Grid-Connected Microgrids
Reza Ghanizadeh
r.ghanizadeh@iaurmia.ac.ir
1
Mahmoud Ebadian
mebadian@birjand.ac.ir
2
Gevork B. Gharehpetian
grptian@aut.ac.ir
3
Department of Electrical Engineering, University of Birjand, Birjand, Iran
Department of Electrical and computer Engineering, University of Birjand, Birjand, Iran.
Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran
In this paper, a new approach is proposed for voltage and current harmonics compensation in grid-connected microgrids (MGs). If sensitive loads are connected to the point of common coupling (PCC), compensation is carried out in order to reduce PCC voltage harmonics. In absence of sensitive loads at PCC, current harmonics compensation scenario is selected in order to avoid excessive injection of harmonics by the main grid. In both scenarios, compensation is performed by the interface converters of distributed generation (DG) units. Also, to decrease the asymmetry among phase impedances of MG, a novel structure is proposed to generate virtual impedance. At fundamental frequency, the proposed structure for the virtual impedance improves the control of the fundamental component of power, and at harmonic frequencies, it acts to adaptively improve nonlinear load sharing among DG units. In the structures of the proposed harmonics compensator and the proposed virtual impedance, a self-tuning filter (STF) is used for separating the fundamental component from the harmonic components. This STF decreases the number of phase locked loops (PLLs). Simulation results in MATLAB/SIMULINK environment show the efficiency of the proposed approach in improving load sharing and decreasing voltage and current harmonics.
https://joape.uma.ac.ir/article_428_11b1f55fc7b1f79a62b2f2ae50109c4b.pdf
Distributed generation
Microgrid
Load Sharing
Voltage and current Harmonics Compensation
Self-Tuning Filter
eng
University of Mohaghegh Ardabili
Journal of Operation and Automation in Power Engineering
2322-4576
2423-4567
2016-06-01
4
1
83
92
426
مقاله پژوهشی
An Improved Big Bang-Big Crunch Algorithm for Estimating Three-Phase Induction Motors Efficiency
An Improved Big Bang-Big Crunch Algorithm for Estimating Three-Phase Induction Motors Efficiency
Mehdi Bigdeli
bigdeli.mehdi@gmail.com
1
Davood Azizian
d.azizian@abhariau.ac.ir
2
Ebrahim Rahimpour
ebrahim.rahimpour@de.abb.com
3
Islamic Azad University
Islamic Azad University
ABB AG, Power Products Division
Nowadays, the most generated electrical energy is consumed by three-phase induction motors. Thus, in order to carry out preventive measurements and maintenances and eventually employing high-efficiency motors, the efficiency evaluation of induction motors is vital. In this paper, a novel and efficient method based on Improved Big Bang-Big Crunch (I-BB-BC) Algorithm is presented for efficiency estimation in the induction motors. In order to estimate the induction motor’s efficiency, the measured current, the power factor and the input power are applied to the proposed method and an appropriate objective function is presented. The main advantage of the proposed method is efficiency evaluation of induction motor without any intrusive test. Moreover, a new effective and improved version of BB-BC algorithm is introduced. The presented modifications can improve the accuracy and speed of the classic version of algorithm. In order to demonstrate the capabilities of the proposed method, a comparison with other traditional methods and intelligent optimization algorithms is performed.
https://joape.uma.ac.ir/article_426_e652af13ec1a0a6d682179f4bcc1c77e.pdf
Efficiency Estimation
Improved Big Bang-Big Crunch (I-BB-BC) Algorithm
Induction Motor
Measurement