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Open Access Article
1 - A New Method for Direct Power Control of DFIG-based Wind Turbines under Voltage Disturbances
Javad Olamaei Mohammad MirzaeianDoubly-fed induction generator (DFIG) is too sensitive to the terminal voltage reduction. Thus, it is essential to choose an appropriate controller for converters in order to have stable voltage as well. In this article, double-fed wind turbines is controlled by vector MoreDoubly-fed induction generator (DFIG) is too sensitive to the terminal voltage reduction. Thus, it is essential to choose an appropriate controller for converters in order to have stable voltage as well. In this article, double-fed wind turbines is controlled by vector proportional integrated regulator. For this purpose, a test network using vector proportional integrated (VPI) regulator is applied. Therefore, the stability is examined by evaluating the considered grid under different fault conditions. In addition, the performance of this grid is evaluated in the case of adding DFIG. Next, the effect of VPI regulator is analyzed on performance of this grid. The results showed that application of vector proportional integrated regulator improves grid stability to a further degree than direct vector regulator. Manuscript profile -
Open Access Article
2 - Power Distribution Expansion Planning
مختار درخشی جواد علماییThis paper presents a method for distribution network expansion planning. The two objectives are: loss reduction and Reliability improvement. First, neural network method is used for long term load forecasting. Then Genetic algorithm is utilized to solve simultaneous pl MoreThis paper presents a method for distribution network expansion planning. The two objectives are: loss reduction and Reliability improvement. First, neural network method is used for long term load forecasting. Then Genetic algorithm is utilized to solve simultaneous placement of power distribution transformers and feeders. The proposed method is applied on the green field. The effectiveness of the proposed method is tested on a green field system and the results are presented. Manuscript profile -
Open Access Article
3 - Comparative study of optimization algorithms for sizing of Wind Turbine/ Fuel Cell/ Electrolyzer/ Hydrogen Tank in the hybrid stand-alone power system
Hadi Razmi Hasan Doagou-Mojarrad Javad OlamaeiIn this paper, a comparative study of optimization algorithms for determining the optimal size of hybrid stand-alone power systems at the lowest total cost is proposed. In this regard, the performance of the components of hybrid power system including wind turbine, fuel MoreIn this paper, a comparative study of optimization algorithms for determining the optimal size of hybrid stand-alone power systems at the lowest total cost is proposed. In this regard, the performance of the components of hybrid power system including wind turbine, fuel cell, anaerobic reactor, reformer, electrolyzer and hydrogen tank has been studied and several different optimization algorithms are taken into account. The proposed method can meet the load demand using wind energy and biomass as an available energy resource. In the stand-alone power system, power produced by the wind turbine and fuel cell (fed by the reformer) are applied to the demand. When these generations are more than the demand, additional power is delivered to the electrolyzer. Otherwise, the hybrid system is fed by the hydrogen tanks. The proposed method has been tested in Kahnooj region located in the southeastern of Iran and the results of various optimization methods have been presented in order to determine the optimal size of the hybrid power system. Manuscript profile -
Open Access Article
4 - Reactive Power Management in Micro Grid with Considering Power Generation Uncertainty and State Estimation
Mohammad Reza Forozan Nasab Javad OlamaeiOptimal reactive power dispatch problem in power systems has thrown a growing influence on secure and economic operation, nonlinear and multi- modal problems. Used methods in this issue can be divided into two categories: First, the classical methods like linear program MoreOptimal reactive power dispatch problem in power systems has thrown a growing influence on secure and economic operation, nonlinear and multi- modal problems. Used methods in this issue can be divided into two categories: First, the classical methods like linear programming (LP), nonlinear programing (NLP), quadratic programming (QP), interior point methods (IPM), Newton-bused methods, and the second, heuristic methods like genetic algorithm (GA), evolutionary programming (EP), and particle swarm optimization (PSO). In this paper, projected quasi-Newton method (PQN) is used as an optimal algorithm. This algorithm is applied on a 6-bus micro grid in medium voltage level. To make the problem more realistic, a wind turbine is put in one of the buses to consider uncertainty in power generation. Also two buses data are not available to add state estimation to the problem. For troubleshooting of power generation uncertainty, time series prediction model is used to predict wind speed. To overcome the problems of unavailability of some bases information, maximum likelihood weighted least squares estimation (MLWLSE) is used. Finally obtained information is used to optimize the reactive power in micro grid. Manuscript profile -
Open Access Article
5 - PV Inverters and Modulation Strategies: A Review and A Proposed Control Strategy for Frequency and Voltage Regulation
Shayan Ebrahimi Ali Moghassemi Javad OlamaeiTo ensure the reliable delivery of AC power to consumers from renewable energy sources, the photovoltaic inverter has to ensure that the frequency and magnitude of the generated AC voltage are within acceptable limits. This paper develops models and control strategies f MoreTo ensure the reliable delivery of AC power to consumers from renewable energy sources, the photovoltaic inverter has to ensure that the frequency and magnitude of the generated AC voltage are within acceptable limits. This paper develops models and control strategies for the DC-AC converter to ensure that the sinusoidal waveform of the desired frequency voltage and magnitude generated for both single-phase and three-phase operation depend on the robustness of the inverter control system. The paper reviews various topologies and modulation approaches for photovoltaic inverters in both single-phase and three-phase operational modes. Finally, a proposed control strategy is presented to ensure frequency and voltage regulation. Manuscript profile -
Open Access Article
6 - MPPT and Current Mode Control Methods for PV Modules: A Review and A New Multi-Loop Integrated Method
Ali Moghassemi Shayan Ebrahimi Javad OlamaeiThis paper reviews various algorithms for the implementation of MPPT in a PV module integrated with a DC-DC converter and current mode control strategies for power converters. Also, a novel multi-loop integrated MPPT and current mode control for the Single Ended Primary MoreThis paper reviews various algorithms for the implementation of MPPT in a PV module integrated with a DC-DC converter and current mode control strategies for power converters. Also, a novel multi-loop integrated MPPT and current mode control for the Single Ended Primary Inductance Converter (SEPIC) derived from the incremental conductance MPPT technique is proposed. A simulation model is developed using MATLAB/Simulink dynamic system simulation software to verify the operation of the control system developed in the paper. This ensures the efficient operation of the PV power plant by rapid and accurate tracking the maximum power point (MPP) of the PV array. Moreover, the system is seen to offer robust voltage regulation and improved dynamic response in the face of changing environmental variables. Manuscript profile -
Open Access Article
7 - Maximum Power Point Tracking Methods Used in Photovoltaic Systems: A Review
Ali Moghassemi Shayan Ebrahimi Javad OlamaeiThis paper reviews and compares the most important maximum power point tracking (MPPT) techniques used in photovoltaic systems. There is an abundance of techniques to enhance the efficiency of photovoltaic systems. The crucial distinctions between these techniques are d MoreThis paper reviews and compares the most important maximum power point tracking (MPPT) techniques used in photovoltaic systems. There is an abundance of techniques to enhance the efficiency of photovoltaic systems. The crucial distinctions between these techniques are digital or analog implementation, simplicity of the design, sensor requirements, convergence speed, stability, range of effectiveness and costs. Thus, opting for a suitable algorithm is vital as it affects the electrical efficiency of the PV system and lowers the costs by lessening the number of solar panels needed to get the desired power. Moreover, the paper provided a summary of the most used MPPT algorithms. Manuscript profile -
Open Access Article
8 - Distribution Network Reconfiguration Study Using The Gravitational Search Algorithm
Nader Mehrabi Javad OlamaeiIn this paper, the electrical distribution network reconfiguration to achieve loss reduction, load balancing and improve voltage profile in the presence of Distributed Generation (DG) with the gravitational search algorithm (GSA), is investigated. By choosing a 33-bus I MoreIn this paper, the electrical distribution network reconfiguration to achieve loss reduction, load balancing and improve voltage profile in the presence of Distributed Generation (DG) with the gravitational search algorithm (GSA), is investigated. By choosing a 33-bus IEEE sample network and running a computer simulation on it, it is observed that the results of this rearrangement are comparable with similar papers. Manuscript profile -
Open Access Article
9 - A New Passive Islanding Detection Method for Distributed Generations Using Time-Frequency Transform-Based EMD-HT
Abbas Doroozi Javad OlamaeiThis paper presents a new method based on empirical mode decomposition and Hilbert transform for detecting islanding from non-islanding events in distributed generations. In this paper, the empirical mode decomposition is used to separate out intrinsic mode functions (I MoreThis paper presents a new method based on empirical mode decomposition and Hilbert transform for detecting islanding from non-islanding events in distributed generations. In this paper, the empirical mode decomposition is used to separate out intrinsic mode functions (IMF) from non-stationary power signal disturbance waveforms. Then, the Hilbert transform applied on all the IMFs to extract the instantaneous amplitude and frequency components. The required index is extracted from the energy spectrum density of the signals that introduced as U1, U2, and U3 and we can detect islanding events with high accuracy, low cost and high speed in distributed generations. Manuscript profile -
Open Access Article
10 - A Novel Approach for Optimal Placement of HV/Mvsubstation and Distributed Generation Simultaneously by Cuckoo Optimization Algorithm
Javad OlamaeiThe long-term planning of distribution network expansion planning has different complexities, because this problem has a lot of decision-making variable. The optimal placement problem of HV/MV substations with distributed generations simultaneously for supplying the cap MoreThe long-term planning of distribution network expansion planning has different complexities, because this problem has a lot of decision-making variable. The optimal placement problem of HV/MV substations with distributed generations simultaneously for supplying the capacity required for power system are analyzed in this paper. In the mathematical model, objective function together with constant, varied variables and constraints related to limitations for the operation of substations and distributed generation resources as well as network limitations are formulated. Despite of distributed generation resources, the simultaneous placement must be so that firstly load points to be supplied and secondly loss costs of the network to be reduced. In addition, the voltage profile improvement and reduction of network reconfiguration costs are considered. At the end, we will observe the power quality improvement in load points. To solve this problem, optimization of one of new algorithms named cuckoo optimization algorithm has been applied. The study period for performing this test by means of dynamic-pseudo method for a long-term study will be within the design period. Finally, tests will be provided for proving the efficiency of this offered optimization algorithm. Manuscript profile
List of Articles جواد علمائی
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