| 1. |
- Alikhanzadehalamdari, Babak, 1993, et al.
(författare)
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Loss Reduction at Partial Loads of Multi-Level DAB Converters Using Adjusted Switching Patterns
- 2023
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 59:5, s. 6312-6323
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Tidskriftsartikel (refereegranskat)abstract
- A three-phase ( $3\boldsymbol{\phi }$ ) dual-active-bridge (DAB) dc-dc converter built with a medium frequency transformer with $\Delta$ Y-connected windings has low efficiency and low transformer utilization in partial loads. This makes the $3\boldsymbol{\phi }$ - $\Delta$ Y-DAB less attractive for applications where the performance at partial loads is crucial. This paper presents control strategies utilizing extra degrees of freedom provided by multi-level converters to minimize the RMS current and improve the partial load operation of the $3\boldsymbol{\phi }$ - $\Delta$ Y-DAB converter. The duration of the zero-level voltage of the Y-side is adjusted with the help of multi-level converters, and the $\Delta$ -side dc-link voltage is controlled externally. It is shown that the RMS current can be reduced by $27 \,\%$ at no-load by increasing the duration of the zero-level voltage of the Y-side. In addition, the turn-on and turn-off currents of the switches of the Y-side can be decreased drastically for power levels below $42 \,\%$ of the nominal power. Considerable performance improvements can be accomplished by combining $\Delta$ -side dc-link reduction with the Y-side duty cycle variation. It is shown that the RMS current at no-load can be reduced by $100 \,\%$ to zero. This is also validated by measurements where more than $90 \,\%$ reduction in the RMS current is observed at no-load. Moreover, a dramatic decrease in the turn-on and turn-off currents of the switches of both bridges is achieved. Measurements highlighted a factor of nine reduction in no-load turn-off currents of the primary bridge. Moreover, a loss split calculation shows that the semiconductor losses can be decreased by $94 \,\%$ and $81 \,\%$ at $5 \,\%$ and $10 \,\%$ of nominal power, respectively.
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| 2. |
- Antonopoulos, Antonios, et al.
(författare)
-
Modular multilevel converter AC motor drives with constant torque from zero to nominal speed
- 2014
-
Ingår i: IEEE transactions on industry applications. - 0093-9994 .- 1939-9367. ; 50:3, s. 1982-1993
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Tidskriftsartikel (refereegranskat)abstract
- Modular multilevel converters are shown to have a great potential in the area of medium-voltage drives. Low-distortion output quantities combined with low average switching frequencies for the semiconductor devices create an ideal combination for very high-efficiency drives. However, the large number of devices and capacitors that have to conduct the fundamental-frequency current require more complex converter control techniques than its two-level counterpart. Special care needs to be taken for starting and operation at low speeds, where the low-frequency current may cause significant unbalance between the submodule capacitor voltages and disturb the output waveforms. In this paper, principles for converter operation with high torque in the whole speed range are investigated. Experimental results from a down-scaled 12-kVA prototype converter running a loaded motor at various speeds between standstill and the rated speed are also provided.
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| 3. |
- Arshad, Waqas M., et al.
(författare)
-
Use of transverse-flux machines in a free-piston generator
- 2004
-
Ingår i: IEEE transactions on industry applications. - 0093-9994 .- 1939-9367. ; 40:4, s. 1092-1100
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Tidskriftsartikel (refereegranskat)abstract
- This paper investigates the use of transverse-flux machines (TFMs) in a free-piston generator, an integration of a combustion engine and a linear electrical machine. For hybrid vehicles (the intended application), this integrated device has benefits in efficiency, emissions, reliability, etc. Conventional TFMs are dimensioned and their shortcomings illustrated. Several surface-mounted TFM designs are suggested. These designs, initially believed to be promising, are later discovered to be. poor during the three-dimensional finite-element method (3-D FEM) analysis. These designs suffered from a large axial pole-to-pole armature-flux leakage in the stator. This problem is solved in the proposed buried-magnets TFM variants, for which patents have been filed as well. A 5-kW proof-of-concept prototype of one such design is dimensioned that allowed the near fulfilment of 3-D FEM verifiable system demands. One phase. of this dimensioned three-phase prototype is built. Measurements on this,prototype showed that the use of short pole lengths in the machine had led to manufacturing defects. Nevertheless, the electromagnetic viability of the design could still be approximately verified.
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| 4. |
- Bahmani, Amin, 1985, et al.
(författare)
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Design methodology and optimization of a medium-frequency transformer for high-power DC-DC applications
- 2016
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers Inc.. - 0093-9994 .- 1939-9367. ; 52:5, s. 4225-4233
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Tidskriftsartikel (refereegranskat)abstract
- The medium-frequency power transformer (MFPT) is one of the key elements of an isolated bi-directional dc-dc converters in applications such as future all-dc offshore wind farms, traction, and solid state transformers. This paper describes a design methodology taking into account loss calculation, isolation requirements, and thermal management. Incorporating this design methodology, an optimization process with a wide range of parameter variations is applied on a design example to find the highest power density while the efficiency, isolation, thermal, and leakage inductance requirements are all met.
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| 5. |
- Bahramara, Salah, et al.
(författare)
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Resiliency-Oriented Economic Sizing of Battery for a Residential Community: Cloud Versus Distributed Energy Storage Systems
- 2023
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 60:2, s. 1963-1974
-
Tidskriftsartikel (refereegranskat)abstract
- The power supply resiliency of residential feeders against grid outages can be enhanced by installing battery energy storage (BES). Most of the previous studies used distributed BES (DBES) to increase resiliency of the feeders. The cloud BES (CBES) can also be used in a similar manner to improve resiliency. However, detailed modeling of optimal CBES sizing for resiliency improvement has not sufficiently been investigated in the literature. This article formulates an optimization problem to determine the optimal CBES size to improve resiliency against grid outages. Both the number of outages and the outage durations are carefully incorporated into the problem. The results obtained by the proposed method with the optimal CBES size are also compared with those found for the optimal DBES size. It has been found that, for the studied feeder, the net present cost (NPC) of CBES decreased by 25.49% compared to its counterpart DBES. When the number of grid outages and/or the outage durations are increased, the CBES is found to be more economical than the DBES for all cases. For a budget limit of $750,000, the maximum interrupted demand is found as 39 kWh and 1,351 kWh for the CBES and DBES, respectively. When the budget limit is increased to $1 M, the interrupted demand for the CBES is reduced to zero whereas the DBES still needs to interrupt a maximum demand of 805 kWh.
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| 6. |
- Balouji, Ebrahim, 1985, et al.
(författare)
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Deep-Learning-Based Harmonics and Interharmonics Predetection Designed for Compensating Significantly Time-Varying EAF Currents
- 2020
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 56:3, s. 3250-3260
-
Tidskriftsartikel (refereegranskat)abstract
- In this article, a new approach to compensate both the response and reaction times of active power filters (APF) for special cases of highly time-varying harmonics and interharmonics of electric arc furnace (EAF) currents is proposed. Instead of using the classical approach of taking a window of past current samples and analyzing the data, future samples of EAF currents are predetected using a deep learning (DL)-based method and then analyzed, which provides the opportunity to make real-time analysis. This can also serve the needs of other possible APF applications. Two different methods for prediction of future samples of harmonics and interharmonics have been proposed: predetection of harmonics and interharmonics in the time domain (TD) and in the frequency domain (FD). To obtain the best possible accuracy for both methods, grid search has been employed for parameter optimization of the DL structure. Both TD and FD approaches have been tested on field data, which had been obtained from transformer substations supplying EAF plants. It is shown that the response time of the APF algorithms can be compensated using the TD-based approach, while it is possible to compensate both the response and reaction times of APFs using the proposed FD-based approach. The developed method can be considered to be a feasible candidate solution for generating reference signals for the controllers of new generation of compensation devices, which can be referred to as predictive APFs.
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| 7. |
- Balouji, Ebrahim, 1985, et al.
(författare)
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Deep Learning Based Predictive Compensation of Flicker, Voltage Dips, Harmonics and Interharmonics in Electric Arc Furnaces
- 2022
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 58:3, s. 4214-4224
-
Tidskriftsartikel (refereegranskat)abstract
- In this research work, deep machine learning-based methods together with a novel data augmentation are developed for predicting flicker, voltage dip, harmonics, and interharmonics originating from highly time-varying electric arc furnace (EAF)currents and voltage. The aim of the prediction is to counteract both the response and reaction time delays of active power filters(APFs) designed explicitly for electric arc furnaces (EAF). Multiple synchronous Reference frame (MSRF) analysis is used to decompose the frequency components of the EAF current and voltage waveforms into dqo components. Then using low-pass filters and prediction of the future values of these dqo components, reference signals for APFs are generated. Three different methods have been developed. In two of them, a low-pass Butterworth filter is used together with a linear FIR based prediction or long short-term memory network (LSTM) for prediction. In the third method, a deep convolutional neural network (CNN) combined with a LSTM network is used to filter and predict at the same time. For a 40 ms prediction horizon, the proposed methods provide 2.06%, 0.31%, 0.99%prediction errors of the dqo components for the Butterworth and linear prediction, Butterworth and LSTM and CNN with LSTM, respectively. The error of the predicted reconstructed waveforms of flicker, harmonics, and interharmonics resulted in 8.5%,1.90%, and 3.2% reconstruction errors for the above-mentioned methods. Finally, a Simulink and GPU-based implementation of predictive APF using Butterworth filter + LSTM and a trivial APF resulted in 96% and 60% efficiency on the compensation of EAF current interharmonics.
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| 8. |
- Behrouzian, Ehsan, 1985, et al.
(författare)
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A Novel Capacitor-Voltage Balancing Strategy for Double-Y STATCOM Under Unbalanced Operations
- 2021
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 57:3, s. 2692-2701
-
Tidskriftsartikel (refereegranskat)abstract
- This paper proposes a novel capacitor-voltage balancing strategy for the double-Y MMC STATCOM operated under unbalanced current conditions of the system. The proposed method, based on zero-sequence voltage injection, manipulates the current distribution between the converter arms to minimize the converter ratings. The proposed balancing strategy is compared with the classical approach, based on controlling the circulating dc currents. For the same unbalanced conditions, the proposed strategy leads to lower energy rating for the converter as compared with the classical one, while the semiconductor ratings remain the same in both strategies. Theoretical findings are verified through experimental results.
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| 9. |
- Beza, Mebtu Bihonegn, 1981, et al.
(författare)
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Application of Recursive Least Squares Algorithm With Variable Forgetting Factor for Frequency Component Estimation in a Generic Input Signal
- 2014
-
Ingår i: IEEE Transactions on Industry Applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 50:2, s. 1168-1176
-
Tidskriftsartikel (refereegranskat)abstract
- Signal estimation is important for protection, system study, and control purposes. This paper deals with the application of a modified recursive least squares algorithm, based on a variable forgetting factor, for estimation of frequency components in a generic input signal. Application areas such as synchronization and control in three- and single-phase systems for various grid conditions as well as estimation of harmonic and subsynchronous components will be discussed. Advantages of the proposed method over the available techniques in terms of estimation speed, frequency selectivity, and noise rejection capability will be described. Finally, simulation and experimental results will be used to evaluate the dynamic performance of the proposed method.
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| 10. |
- Birk, Wolfgang, et al.
(författare)
-
Model-based estimation of molten metal analysis in the LD converter : experiments at SSAB Tunnplat AB in Lulea
- 2002
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 38:2, s. 565-570
-
Tidskriftsartikel (refereegranskat)abstract
- Experiences from field tests of a model-based molten metal analysis estimation system for the Linz and Donawitz converter process are reported. Experiments have been carried out during a six-month-long period on two converters at SSAB Tunnplat AB, Lulea, Sweden. The achieved results prove viability of the approach taken and indicate its high potential regarding estimation accuracy and robustness. It is also concluded that some further system development is necessary to enable modeling of additives and lance level before the system can be recommended for permanent installation
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| 11. |
- Birk, Wolfgang, et al.
(författare)
-
Physical modeling and control of dynamic foaming in an LD-converter process
- 2001
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 37:4, s. 1067-1073
-
Tidskriftsartikel (refereegranskat)abstract
- This paper deals with physical modeling and control of dynamic foaming in the LD-converter process. An experimental setup consisting of a water model, digital signal processor, and PC hardware is built and shown to be useful for studying dynamic foaming. Furthermore, a foam height estimation algorithm is presented and validated through experiments. Finally, sound signals from the LD-converter and water model are compared and similarities between them are found.
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| 12. |
- Birk, Wolfgang, et al.
(författare)
-
Sensitivity analysis of an LQ optimal multivariable controller for a fine coal injection vessel
- 2000
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 36:3, s. 871-876
-
Tidskriftsartikel (refereegranskat)abstract
- This paper deals with a sensitivity analysis of a linear quadratic optimal multivariable controller for a fine coal injection vessel used in the blast furnace process. The multivariable controller from a previous work is briefly presented and the closed-loop system is studied by means of a sensitivity analysis. Effects of disturbances and uncertainty on the closed-loop system are studied based on analysis of the singular values of the sensitivity and the complementary sensitivity functions, the relative gain array, and the minimized condition numbers. Finally, the sensitivity analysis is validated by the use of logged data from test operation at the coal injection plant at SSAB Tunnplat AB, Lulea, Sweden
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| 13. |
- Birk, Wolfgang, et al.
(författare)
-
Video monitoring of pulverized coal injection in the blast furnace
- 2002
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 38:2, s. 571-576
-
Tidskriftsartikel (refereegranskat)abstract
- A novel approach to monitoring and control of the coal powder injection in a blast furnace is presented and discussed. Image analysis of video recordings is used as a means to estimate the instantaneous coal flow. Initial experiments at blast furnace number 3 of SSAB Tunnplat AB, Lulea, Sweden, are reported and firsthand results on modeling and control of a single injection line are given.
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| 14. |
- Bissal, Ara, et al.
(författare)
-
Electric to Mechanical Energy Conversion of Linear Ultrafast Electromechanical Actuators Based on Stroke Requirements
- 2015
-
Ingår i: IEEE transactions on industry applications. - 0093-9994 .- 1939-9367. ; 51:4, s. 3059-3067
-
Tidskriftsartikel (refereegranskat)abstract
- The operational efficiency of ultrafast actuators used as drives in high-voltage direct-current breakers is at best 5%. To boost their efficiency, the design of the energizing circuit is crucial. A multiphysics finite-element method model coupled with a SPICE circuit model that is able to predict the performance of the actuator with an accuracy of at least 95% has been developed and verified experimentally. Several variants of prototypes and models have been simulated, built, and tested. It was shown that one of the main problems leading to low efficiencies is the stroke of the drive. However, there is a possibility to increase the efficiency of the electric to mechanical energy conversion process of the studied Thomson coil (TC) and double-sided coil (DSC) to a maximum of 54% and 88%, respectively, if their stroke is minimized. These efficiencies are idealistic, and these were obtained with clamped armature studies. The efficiency of the actuator can be increased at the expense of increasing the complexity and the cost of the contact system by designing a switch with several series-connected contacts that is encapsulated in a medium with a high dielectric strength. Another proposed solution is to design a current pulse with a rise time that is considerably shorter than the mechanical response time of the system. Parametric variations of capacitances and charging voltages show that the TC and the DSC can achieve efficiencies up to 15% and 23%, respectively. Regardless of the chosen method, the DSC has a superior efficiency compared to a TC.
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| 15. |
- Boscaglia, Luca, 1991, et al.
(författare)
-
Numerically-based Reduced-order Thermal Modeling of Traction Motors
- 2021
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 57:4, s. 4118-4129
-
Tidskriftsartikel (refereegranskat)abstract
- This paper presents an approach based on numerical reduced-order modeling to analyze the thermal behavior of electric traction motors. In this study, a single conjugate heat transfer analysis provides the possibility to accurately predict thermal performances by incorporating both computational fluid dynamic and heat transfer modules. Then, the developed model is used as the basis for deriving a fast reduced-order model of the traction motor enabling prediction of motor thermal behaviour in duty cycles with a high number of operating points. All the results achieved are verified using flow and temperature measurements carried out on a traction motor designed and built for a traction application. A good agreement between the measured and estimated values of flows and temperatures is achieved while keeping the computation time within a reasonable range for both the full-order and reduced-order conjugate heat transfer models. The optimized full-order model can be run in minutes and the reduced-order model computation time is less than one second per operating point. The transient simulation based on reduced-order model is conducted and both the learning phase and validation results are well illustrated. It is shown than the deviation of the reduced-order model in estimating the motor thermal performance is less than one Celsius degree from the full-order model.
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| 16. |
- Colmenares, Juan, et al.
(författare)
-
High-Efficiency 312-kVA Three-Phase Inverter Using Parallel Connection of Silicon Carbide MOSFET Power Modules
- 2015
-
Ingår i: IEEE transactions on industry applications. - : IEEE. - 0093-9994 .- 1939-9367. ; 51:6, s. 4664-4676
-
Tidskriftsartikel (refereegranskat)abstract
- This paper presents the design process of a 312-kVA three-phase silicon carbide inverter using ten parallel-connected metal-oxide-semiconductor field-effect-transistor power modules in each phase leg. The design processes of the gate-drive circuits with short-circuit protection and power circuit layout are also presented. Measurements in order to evaluate the performance of the gate-drive circuits have been performed using a double-pulse setup. Moreover, electrical and thermal measurements in order to evaluate the transient performance and steady-state operation of the parallel-connected power modules are shown. Experimental results showing proper steady-state operation of the power converter are also presented. Taking into account measured data, an efficiency of approximately 99.3% at the rated power has been measured for the inverter.
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| 17. |
- Cossale, Marco, et al.
(författare)
-
Practical Investigations on Cobalt–Iron Laminations for Electrical Machines
- 2015
-
Ingår i: IEEE transactions on industry applications. - IEEE. - 0093-9994 .- 1939-9367. ; 51:4, s. 2933-2939
-
Tidskriftsartikel (refereegranskat)abstract
- The adoption of high-performance soft magnetic material can be considered a possible way to respect the challenging design specifications for aerospace and automotive electrical machines. This paper presents an accurate noninvasive investigation of magnetic and energetic properties of cobalt–iron stator cores. In particular, the focus lies on the annealing processes aimed to maximize the magnetic saturation and the mechanical strength. Three cobalt–iron stator core samples coming from different annealing processes have been analyzed, both from the BH characteristics and losses viewpoints. Stator slot effects on the magnetic measurements have been investigated by finite-element method. A fringing effect correction factor to be applied on the measured BH curves is as well reported. In order to complete the experimental campaign analysis, micrographic analysis of the material structure is presented, as well as the iron losses separation coefficients.
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| 18. |
- Espin Delgado, Angela, et al.
(författare)
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Characterization of Phase-Angle Jump in RadialSystems using Incremental Voltage Phasors
- 2019
-
Ingår i: IEEE transactions on industry applications. - : IEEE. - 0093-9994 .- 1939-9367. ; 55:2, s. 1117-1125
-
Tidskriftsartikel (refereegranskat)abstract
- A methodology for characterizing the phase-angle jump associated with voltage sags in radial systems using incremental voltage quantities is presented in this paper. The incremental voltage phasor is defined as the difference between the pre-fault and the during-fault voltage phasors at the point of common coupling. The characteristics of this phasor are stated for different fault conditions as a function of system impedances. Both fault impedance and source neutral grounding impedance are considered in the analysis. Furthermore, the vector representation of phasors and impedance diagrams are employed as a graphical aid for understanding the incremental quantities behavior as a function of the system parameters. An algorithm for fault classification is also presented. Finally, the theoretical analysis is confirmed using real data provided by the Department of Energy and the Electric Power Research Institute. The results of this paper can be useful in future works for fault classification and fault location.
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| 19. |
- Grunditz, Emma, 1980, et al.
(författare)
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Acceleration, Drive Cycle Efficiency, and Cost Tradeoffs for Scaled Electric Vehicle Drive System
- 2020
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 56:3, s. 3020-3033
-
Tidskriftsartikel (refereegranskat)abstract
- This article investigates and quantifies, for varying drive system ratings (0.5-2.0 times the rating of a small and large reference system), the tradeoff relations between the electric vehicle acceleration performance and energy consumption during a wide range of drive cycles, using detailed load-dependent loss models. Additionally, the results are related to estimated drive system cost by transparently determined scalable electric motor and inverter cost models. When reducing the system rating to half, the cost is 83% of the small reference system and 76% of the large. The acceleration time (0-100 km/h) decreases nonlinearly with increasing system rating. Interestingly, the drive cycle energy consumption generally decreases with decreasing drive system rating, and most cycles show a minimum consumption with a downscaled drive system. For the small system, the strongest impact was noted for the HWFET cycle where the energy consumption is reduced 2% when downscaling the drive system by 0.5 relative to the reference system. For the large system, NYCC shows the largest reduction in energy consumption: 4% when scaled by 1.6 relative to the reference system.
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| 20. |
- Hammarström, Thomas, 1974
(författare)
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A General Measurement Set-up Approach to Evaluate Insulation System Quality by Exploring PWM and DC Biased waveforms
- 2020
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 56:4, s. 3614-3624
-
Tidskriftsartikel (refereegranskat)abstract
- This article presents a novel test approach able to detect and evaluate PD characteristics when employing various wave shapes similar or close to what is used in different applications. The method covers the range from bipolar PWM with ultra-fast rise times to dc voltages with or without superimposed high -frequency content. Measurement results from tests on twisted pair aimed to resemble a random wound motor are presented. In particular, the influence of conductivity, permittivity, and rise time is explored by applying square- shaped waveforms. The PDs appearing after the unipolar flanks are compared with full -size bipolar voltage steps. One important observation presented is that when the zero voltage was reached and kept, the remaining charges within and surrounding the defect produced a PD pattern (PD echo) which resembles the charge amount present within the winding. Additionally, PWM shaped voltage waveforms superimposed on dc voltages present advantages when further evaluating the influence of material properties. Different step sizes are employed to represent dc voltage with or without superimposed voltage ripple to elucidate the influence on PD characteristics also on HVdc like applications. It can be concluded that higher frequency harmonics will result in considerably larger PD exposure. This article shows that during material evaluation, important common properties and guidelines can be found between these different waveform extremes, suggesting that a more efficient insulation coordination can be obtained selecting the most appropriate or time- efficient evaluation method.
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| 21. |
- Harnefors, Lennart, et al.
(författare)
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Model-Based Current Control of AC Machines Using the Internal Model Control Method
- 1998
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 34:1, s. 133-141
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the internal model control (IMC) method is applied to AC machine current control. Permanent magnet synchronous machines and induction machines are considered. The result is synchronous-frame proportional integral (PI) or PI-type controllers, the parameters (gain and integration time) of which are expressed directly in certain machine parameters and the desired closed-loop bandwidth. This simplifies the controller design procedure, eliminating or reducing the need for trial-and-error steps, and is the main purpose for using IMC.
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| 22. |
- Hsieh, Meng-Ju, 1985, et al.
(författare)
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Improved Parametric Representation of IM from FEM for More Accurate Torque Predictions: Simulations and Experimental Validations
- 2024
-
Ingår i: 2022 IEEE International Conference on Environment and Electrical Engineering and 2022 IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2022. - 1939-9367 .- 0093-9994. ; In Press
-
Tidskriftsartikel (refereegranskat)abstract
- In this work, an updated methodology to determine the parameters of three-phase induction machines (IMs) is developed and presented. The goal of this determination is to achieve a better model representation of induction machines for the usage of a circuit-based control system. First, the theory of the T-form model (TFM) and the inverse Γ-form model (IGFM) are reviewed. The former review becomes the foundation of the following interpretation of the developing methods for identifying the needed parameters. Next, a 2D electromagnetic finite element method (FEM) model of a 15kW IM is utilized to demonstrate the strength of the methodology on a real machine. Furthermore, a comparison of results using the conventional test and the newly proposed method is presented, demonstrating the strength of the proposed procedure with enhanced accuracy for the torque and slip prediction. Lastly, experimental results using a 15kW IM are utilized to demonstrate the usefulness of the proposed parameter determination procedure.
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| 23. |
- Johansson, Andreas, et al.
(författare)
-
Detection of incipient clogging in pulverized coal injection lines
- 2000
-
Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 36:3, s. 877-883
-
Tidskriftsartikel (refereegranskat)abstract
- This paper deals with the detection of clogging in the coal injection lines of a blast furnace. A physical model is developed and augmented with a signal that represents clogging. A nonlinear observer is proposed and shown to have any predefined convergence rate. An adaptive detection threshold scheme which is robust against time-varying uncertainties is employed. Simulations and experiments with real data are carried out to illustrate the usefulness of the methods.
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| 24. |
- Kermani, Mostafa, 1986, et al.
(författare)
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A Comprehensive Techno-economic Solution for Demand Control in Ports: Energy Storage Systems Integration
- 2022
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 58:2, s. 1592-1601
-
Tidskriftsartikel (refereegranskat)abstract
- The specific types of loads such as cranes, in particular, ship to shore (STS), rubber tyred gantry (RTG), rail mounted gantry (RMG) and cold ironing system in the ports present a distinctive load profile, due to their sudden peak load demand. To deal with the problem and avoid extra costs, it is possible to apply a delay time management to cranes operation and/or to implement energy storage systems (ESSs) to take benefit of regenerative energy. At this aim, the load profile characteristics require both energy storage with high power and energy densities and fast response time. Peak shaving can optimize the load demand and facilitate the participation of small power generation units based on renewable energy resources. In this regard, many approaches are introduced such as energy management strategies, modern technologies, and installing high-tech devices such as battery energy storage (BES), ultracapacitors (UCs), and flywheel energy storage (FES) acting as ESS. Therefore, the goal of this paper is to deal with an investigation for an integrated vision and a combination of ESSs application in the ports loads. Since the ports cannot persist to have independent and uncontrolled power systems, hence, the paper proposes the organization of their global design in a microgrid approach and the coordinated management for all the services such as cranes, reefers, col ironing, trucks, offices to increase the operation and energy performance. The statistical results show that the integration of ESSs can provide peak shaving, energy saving, and cost reduction in ports.
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| 25. |
- Kermani, Mostafa, 1986, et al.
(författare)
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Compact and Smart Outdoor Medium/Low Voltage Substation for Energy Communities
- 2022
-
Ingår i: IEEE Transactions on Industry Applications. - 0093-9994 .- 1939-9367. ; 58:3, s. 3123-3133
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Tidskriftsartikel (refereegranskat)abstract
- Energy transition toward smart grids with deep impact of renewables, energy storage systems, and electric vehicle charging stations will increasingly promote the establishment of energy communities that own portions of the electricity grid. The energy communities will consist of clusters of multiunit buildings and or single residential units aggregated sharing a common or multiple medium and low voltage (MV/LV) electrical substations. The size and impact of the location of these MV/LV substations can constitute a barrier especially for highly urbanized contexts where it is very complicated to provide technical spaces inside buildings for large technical systems like transformers, MV switchgear, etc. The idea of this work consists of developing a compact outdoor MV/LV substation to reduce the overall dimensions and to make the execution modularized to facilitate management and maintenance. Also an investigation of energy exchange between multiunit buildings, which are considered as the real energy community case study. The main objective for this case study is to minimize the operation cost of the system by maximizing the self-consumption.
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