Robust Active Power Control of a Battery-Supported DSTATCOM to Enhance Wind Generation Power Flow

Mohammad Mahdianpoor,Arash Kiyoumarsi,Mohammad Ataei,Rahmat-Allah Hooshmand 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.4

The lack of controllability over the wind causes fluctuations in the output power of the wind generators (WGs) located at the wind farms. Distribution Static Compensator (DSTATCOM) equipped with Battery Energy Storage System (BESS) can significantly smooth these fluctuations by injecting or absorbing appropriate amount of active power, thus, controlling the power flow of WGs. But because of the component aging and thermal drift, its harmonic filter parameters vary, resulting in performance degradation. In this paper, Quantitative Feedback Theory (QFT) is used as a robust control scheme in order to deactivate the effects of filter parameters variations on the wind power generation power smoothing performance. The proposed robust control strategy of the DSTATCOM is successfully applied to a microgrid, including WGs. The simulation results obviously show that the proposed control technique can effectively smooth the fluctuations in the wind turbines’ (WT) output power caused by wind speed variations; taking into account the filter parameters variations (structural parameter uncertainties).

Robust Active Power Control of a Battery-Supported DSTATCOM to Enhance Wind Generation Power Flow

Mahdianpoor, Mohammad,Kiyoumarsi, Arash,Ataei, Mohammad,Hooshmand, Rahmat-Allah The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.8 No.1

The lack of controllability over the wind causes fluctuations in the output power of the wind generators (WGs) located at the wind farms. Distribution Static Compensator (DSTATCOM) equipped with Battery Energy Storage System (BESS) can significantly smooth these fluctuations by injecting or absorbing appropriate amount of active power, thus, controlling the power flow of WGs. But because of the component aging and thermal drift, its harmonic filter parameters vary, resulting in performance degradation. In this paper, Quantitative Feedback Theory (QFT) is used as a robust control scheme in order to deactivate the effects of filter parameters variations on the wind power generation power smoothing performance. The proposed robust control strategy of the DSTATCOM is successfully applied to a microgrid, including WGs. The simulation results obviously show that the proposed control technique can effectively smooth the fluctuations in the wind turbines' (WT) output power caused by wind speed variations; taking into account the filter parameters variations (structural parameter uncertainties).

Toward residential building energy conservation through the Trombe wall and ammonia ground source heat pump retrofit options, applying eQuest model

Ataei, Abtin,Dehghani, Mohammad Javad Techno-Press 2016 Advances in energy research Vol.4 No.2

The aim of this research is to apply the eQuest model to investigate the energy conservation in a multifamily building located in Dayton, Ohio by using a Trombe wall and an ammonia ground source heat pump (R-717 GSHP). Integration of the Trombe wall into the building is the first retrofitting measure in this study. Trombe wall as a passive solar system, has a simple structure which may reduce the heating demand of buildings significantly. Utilization of ground source heat pump is an effective approach where conventional air source heat pump doesn't have an efficient performance, especially in cold climates. Furthermore, the type of refrigerant in the heat pumps has a substantial effect on energy efficiency. Natural refrigerant, ammonia (R-717), which has a high performance and no negative impacts on the environment, could be the best choice for using in heat pumps. After implementing the eQUEST model in the said multifamily building, the total annual energy consumption with a conventional R-717 air-source-heat-pump (ASHP) system was estimated as the baseline model. The baseline model results were compared to those of the following scenarios: using R-717 GSHP, R410a GSHP and integration of the Trombe wall into the building. The Results specified that, compared to the baseline model, applying the R-717 GSHP and Trombe wall, led to 20% and 9% of energy conservation in the building, respectively. In addition, it was noticed that by using R-410a instead of R-717 in the GSHP, the energy demand increased by 14%.

Application of impulse damper in control of a chaotic friction-induced vibration

Mansour Ataei,Ali Asghar Atai,Sajjad Mirjavadi,Mohammad Sahebnasagh,Mansour Nikkhah-Bahrami 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2

Friction-induced vibration is an important phenomenon with adverse effects on many dynamic systems involving friction. In this study,a very simple and well-known one-dimensional friction-induced dynamic system is considered in which the novel PZT stack impulse damper is incorporated into the system. It has been shown that by appropriately tuning the damping parameters, the chaotic behavior is removed quickly and efficiently. It has also been demonstrated that the system is sensitive to parameter change, and minimal modification of these parameters can revert the chaotic or periodic motion.

Growth, Yield, Chemical Composition, and Antioxidant Activity of Essential Oils from Two Thyme Species under Foliar Application of Jasmonic Acid and Water Deficit Conditions

Seyed Mohammad Alavi-Samani,Mehrdad Ataei Kachouei,Abdollah Ghasemi Pirbalouti 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.4

Jasmonic acid (JA) exerts biological activity in plant responses to environmental stress as well as development. The effect of foliar application of JA and combination with deficit irrigation on some characteristics of two thyme species, including Thymus vulgaris and T. daenensis were investigated. Treatments comprised 0, 200, and 400 μL JA applied to plants under normal, slight drought, and mild drought stress conditions. Irrigation levels had a significant effect on growth traits in terms of herbage dry weight, plant height, number of branches, and leaf area index. Foliarapplication of JA influenced the essential oil yield and the main components of the oils. Percentages of carvacrol, γ-terpinene, and p-cymene in the oil extracted from the plants under stressed conditions were higher than non-stressed plants, whereas percentage of thymol was significantly reduced under drought stress. In both thyme species, the JA significantly improved carvacrol and thymol contents in the oils, antioxidant activity, plant height, and root length, but reduced the essential oil yield and amount of γ-terpinene in the oils. In conclusion, the foliar application of JA reduced the negative effects of water stress on thymol amount in T. daenensis, and γ-terpinene content in T. vuglaris.

Real-Coded Genetic Algorithm Based Design and Analysis of an Auto-Tuning Fuzzy Logic PSS

Rahmat-Allah Hooshmand,Mohammad Ataei 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.2

One important issue in power systems is dynamic instability due to loosing balance relation between electrical generation and a varying load demand that justifies the necessity of stabilization. Moreover, Power System Stabilizer (PSS) must have capability of producing appropriate stabilizing signals over a wide range of operating conditions and disturbances. To overcome these drawbacks, this paper proposes a new method for robust design of PSS by using an auto-tuning fuzzy control in combination with Real-Coded Genetic Algorithm (RCGA). This method includes two fuzzy controllers; internal fuzzy controller and supervisor fuzzy controller. The supervisor controller tunes the internal one by on-line applying of nonlinear scaling factors to inputs and outputs. The RCGA￢based method is used for off-line training of this supervisor controller. The proposed PSS is tested in three operational conditions; nominal load, heavy load, and in the case of fault occurrence in transmission line. The simulation results are provided to compare the proposed PSS with conventional fuzzy PSS and conventional PSS. By evaluating the simulation results, it is shown that the performance and robustness of proposed PSS in different operating conditions is more acceptable.

Improving the Dynamic Performance of Distribution Electronic Power Transformers Using Sliding Mode Control

Rahmat-Allah Hooshmand,Mohammad Ataei,Mohammad Hosein Rezaei 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.1

These days, the application of electronic power transformers (EPTs) is expanding in place of ordinary power transformers. These transformers can transmit power via three or four wire converters. Their dynamic performance is extremely important, due to their complex structure. In this paper, a new method is proposed for improving the dynamic performance of distribution electronic power transformers (DEPT) by using sliding mode control (SMC). Hence, to express the dynamic characteristics of a system, different factors such as the voltage unbalance, voltage sag, voltage harmonics and voltage flicker in the system primary side are considered. The four controlling aims of the improvement in dynamic performance include: 1) maintaining the input currents so that they are in sinusoidal form and in phase with the input voltages so they have a unity power factor, 2) keeping the dc-link voltage within the reference amount, 3) keeping the output voltages at a fixed amount and 4) keeping the output voltages in sinusoidal and symmetrical forms. Simulation results indicate the potential and capability of the proposed method in improving DEPT behavior.

Optimal Adaptive Controller Based on STATCOM and UPFC

Hemmati, Reza,Koofigar, Hamidreza,Ataei, Mohammad The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.5

Application of fuzzy RES and fuzzy DEMATEL in the rock behavioral systems under uncertainty

Ramin Rafiee,Sadjad Mohammadi,Mohammad Ataei,Reza Khalookakaie 한국자원공학회 2019 Geosystem engineering Vol.22 No.1

Most of the mine design methods, especially in underground mining depend on the rock mechanics and thus, they are based on rock behavioral systems. Existence of uncertainty in the rock physical and mechanical parameters leads this assessment to be impossible. In such situation, the system thinking methods can be useful. The aim of this paper is to apply system thinking-based techniques for assessment of the rock mass cavability in block caving mines. For this purpose, fuzzy rock engineering system (FRES) and the decision-making trial and evaluation laboratory (FDEMATEL) methods are used to investigate caving behavioral system. The interrelationships and structure of the parameters involved in the rock mass cavability were determined by these methods. In addition, the parameters were categorized from causality point of view and ranked due to their importance. Finally, two methods were compared in the studying a complex system like the cavability of rock masses from their advantages and disadvantages point of view. This study shows that such analysis is useful in practice to better understanding rock behavior and its impact on the working space regard to the safety and the productivity.

Optimal Adaptive Controller Based on STATCOM and UPFC

Reza Hemmati,Hamidreza Koofigar,Mohammad Ataei 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5

In this paper, an advanced and modified MRAS technique is utilized for controller design in electric power systems. The weighting factors of the proposed MRAS are tuned by using PSO. This optimal-adaptive controller is also normalized by normalization techniques to guarantee the system stability. The proposed MRAS then is applied to design STATCOM stabilizer and UPFC power flow controller. STATCOM stabilizer is a regulatory controller, while the power flow controller of UPFC is a tracking one. Therefore, the ability of the proposed MRAS technique to design regulatory and tracking controllers is investigated. In order to indicate the effectiveness of the proposed method, it is evaluated against the conventional methods. Simulation results demonstrate the validity of the method, under uncertainties and different disturbances.