Khomfoi, Surin

Preferred name

Khomfoi, Surin

Alternative Name

Khomfoi, S.

Main Affiliation

School of Engineering

surin.kh@kmitl.ac.th

Now showing 1 - 10 of 12

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Hamiltonian-Differential Flatness Control Laws for Battery/Ultracapacitor for Hybrid Electric Vehicle Applications
(2023-01-01)
Mungporn, Pongsiri
;
Khomfoi, Surin
;
Inteeworn, Ridtee
;
Gonmanee, Apinun
;
Pierfederici, Serge
This paper introduces the Hamiltonian-differential flatness control laws specifically designed for battery and ultracapacitor (UC) hybrid vehicle systems. The main goal of these control laws is to effectively manage power flow and optimize energy utilization in hybrid systems combining batteries and UC. The proposed control laws use Hamiltonian control and differential flatness techniques to dynamically regulate the energy distribution between the battery and UC, particularly in the context of constant power load (CPL) challenges within DC Microgrid applications, including vehicle systems. To confirm the efficiency of the proposed control strategy, the experimental test bench has been set up with a Li-ion battery module (LFeLi-48100TB, 48 Vdc, 100 Ah) and a UC module with a capacitance of (188.88 F, 51.3 V.) Finally, the experimental results confirm the exceptional performance of the studied control law throughout the load-drive cycles.
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Wireless Power Transfer System for Autonomous Driving Robot Battery Charging
(2023-01-01)
Pairindra, Worapong
;
Khomfoi, Surin
;
Takorabet, Noureddine
;
Thounthong, Phatiphat
This paper presents a prototype of a 48V, 200W with 85 kHz wireless power transfer. The load-independent charging topology consists of an LCC/C resonant tank that provides an autonomous driving robot that is used in many industrial applications. The validation is carried out using MATLAB/Simulink and hardware implementation. The rear side battery can apparently be charged with a 15cm distance between two coils and the output voltage can be controlled at a specific level with approximately 70% efficiency.
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EV Charging Station Planning Based on Nearby Station Data
(2024-01-01)
Somboonpanya, Nattapon
;
Ketjaem, Supakorn
;
Khomfoi, Surin
;
Phophongviwat, Teeraphon
;
Thounthong, Phatiphat
This paper presents the optimal electric vehicle charging station installation planning, focusing on the installation scenarios where the location is pre-selected. The optimization process includes the maximum charging power capacity and the number of electric vehicles charging stations. Energy consumption information from nearby charging stations is harvested and then analyzed for forecasting the energy supply behavior of each charging station. This paper has a financial analysis to evaluate the cost-effectiveness of each installation scenario. Additionally, this methodology is demonstrated through the real-world data of charging patterns from electric vehicles at each charging station in Thailand.
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CC-CV Charging Control Based on Modified Hamiltonian Control Law for EV Application
(2024-01-01)
Somboonpanya, Nattapon
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Khomfoi, Surin
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Phophongviwat, Teeraphon
;
Jamshidpour, Ehsan
;
Thounthong, Phatiphat
This paper proposes constant current-constant voltage (CC-CV) charging control based on Hamiltonian control law with a state observer for a bidirectional buck-boost converter on an EV charger. The CC-CV charging scheme is mainly utilized to charge lithium-ion batteries on an electric vehicle. In CC mode, the battery is charged with a preset value until the battery voltage reaches the desired equalized voltage. During CV mode, equalized current is used to maintain battery voltage to equalize the battery. In this work, equalization current requires the actual battery voltage, desired battery voltage, and the battery current for its calculation. Additionally, a state observer is implemented to estimate voltage across uncertainties of resistance and the battery current. Also, it can enhance the performance of the proposed control scheme and minimize the required sensors. Furthermore, the 1 kW prototype of the bidirectional buck-boost converter is developed to demonstrate the feasibility of the proposed controlled scheme.
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Hamiltonian/Differential Flatness Control Law for Fuel Cell/Supercapacitor for DC Microgrid Applications
(2025-01-01)
Mungporn, Pongsiri
;
Khomfoi, Surin
;
Yodwong, Burin
;
Bizon, Nicu
;
Pierfederici, Serge
This paper presents a Hamiltonian/differential flatness control law designed for the management of fuel cell/supercapacitor hybrid systems in DC microgrid applications. The control strategy aims to optimize energy management while enhancing the efficiency and stability of DC microgrids. By leveraging the complementary characteristics of fuel cells (high energy density, slow dynamics) and supercapacitors (high power density, rapid response), it addresses specific limitations. The energy of the systems is governed by the Hamiltonian framework, while the differential flatness theory enables precise control of system dynamics, ensuring optimal operation and accurate trajectory tracking. To assess the performance of the control algorithm, an experimental test bench has been established. Experimental results confirm the effectiveness of the control law in managing a load-drive cycle under constant power load conditions, balancing power flow, reducing fuel cell stress, and extending the life of the supercapacitor.
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Control Strategy of Interleaved Buck Converter for Automated Guided Vehicles with Misalignment in Wireless Power Transfer Systems
(2024-01-01)
Phongsawat, Suwaphit
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Pairindra, Worapong
;
Khomfoi, Surin
;
Phophongviwat, Teeraphon
;
Takorabet, Noureddine
The analysis of the positioning of the power transmission coil with a power rating of 3 kW and an output voltage of 48 V at a frequency of 85 kHz is presented, along with a simulation of the wireless power transfer (WPT) control system using an LCC-S resonance compensation circuit, applied to automated guided vehicles (AGVs). The case where the coil positions are misaligned with a deviation of 0-20% from the size of the power transmission coil is considered. Apparently, it can be illustrated that when the two power transmission coils are misaligned, the battery can still be charged in constant current mode using an interleaved buck converter circuit through a PI controller to increase the output power. The operation is simulated using MATLAB/Simulink software.
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The Development of DC-Nano Grid with Wide-Range Wireless Power Transfer for EVs
(2022-01-01)
Pairindra, Worapong
;
Khomfoi, Surin
;
Takorabet, Noureddine
;
Thounthong, Phatiphat
This research paper presents a wireless power supply for electronic or electrical devices such as LED taillights or headlight bulbs on the electric vehicle (EVs). The main objectives of using wireless power transfer (WPT) are cost savings and the prevention of fires caused by the insulation burning due to overheating in the conventional cable. According to commercial necessity, the primary goal of the research is to simplify the power converter and transmission coils. Therefore, a high-frequency half-bridge inverter connected with a resonant tank compensator is selected for this task. The power transfer rate is set at 24V, 24W via the high-frequency inverter with 4SV DC input voltage. Apparently, the wireless power at the point load can be controlled at the desired value by using both MATLAB/Simulink and hardware implementations with different ranges of evaluation.
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Modeling and Control of Multiphase Interleaved Fuel-Cell Boost Converter Based on Hamiltonian Control Theory for Transportation Applications
(2020-06-01)
Mungporn, Pongsiri
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Thounthong, Phatiphat
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Yodwong, Burin
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Ekkaravarodome, Chainarin
;
Bilsalam, Anusak
This article presents a multiphase interleaved boost converter supplied by a fuel-cell (FC)/reformer power source for highly dynamic transportation applications. A control theory based on the Hamiltonian function approach is considered. Using the port-controlled Hamiltonian system, we propose simple solutions to the dynamic performance and convergence problems when an interaction occurs between the power sources and constant power loads. To corroborate the proposed control law, an FC boost converter (2.5-kW two-phase interleaved converter) is used and investigated in the laboratory. The methanol FC system is composed of a fuel reformer reactor that transforms water and methanol liquid fuel into hydrogen gas to a polymer electrolyte membrane FC stack (2.5 kW, 50 V). The studied control approach is realized by digital calculation using a MicroLabBox controller board (dSPACE platform). The simulation using the MATLAB/Simulink program and the experimental results validate that our proposed solution is an excellent control algorithm for highly dynamic power-load cycles.
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State of Health Battery Estimation by Using the OCPP of Charging Station Combined with Loss of EV Charging System
(2023-01-01)
Peanjad, Pannawat
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Khomfoi, Surin
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Phophongviwat, Teeraphon
;
Manee-Inn, Chaitouch
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Thounthong, Phatiphat
The research paper focuses on estimating the health of electric vehicle batteries using electrical variables measured by the charger during the charging process. These variables are sent to a central processing system via OCPP (Open Charge Point Protocol), as the charger itself has limitations in directly measuring battery health. To overcome this limitation, this research utilizes electrical variables measured by the DC charger during the charging process to estimate battery health. The Coulomb counting method is employed in combination with an investigation into losses within the vehicle's charging system to enhance the accuracy of State of Health (SoH) estimation. The obtained battery health values will assist electric vehicle users in better trip planning and maintenance scheduling.
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Improved Hamiltonian Control Law with Load Current Sensorless of Multiphase Parallel Converter for Electric Vehicle Applications
(2023-01-01)
Kamnarn, Uthen
;
Yodwong, Burin
;
Mungporn, Pongsiri
;
Thounthong, Phatiphat
;
Khomfoi, Surin
This article presents an improved Hamiltonian control law (HCL) with load current sensorless ability for multiphase parallel converters in electric vehicle applications. On one hand, the proposed control approach has a significant advantage in handling constant power load (CPL) that occurs in the situation of the vehicle, which is a dangerous situation that can cause oscillations and uncertainty. On the other hand, the load current observer is applied with HCL to improve the efficiency and reliability of the converter system. In addition, by eliminating the need for current sensors, the cost and size of the converter system are reduced, while maintaining accurate current control. Moreover, the difference flatness approach has been applied to generate the current reference resulting in regulating the DC bus voltage. Finally, the multiphase two-quadrant converter driving by the proposed control law has been evaluated through experimental tests. The obtained experimental results demonstrate the excellent performance of the multiphase two-quadrant converter with CPL thereby confirming the efficacy of the proposed approach.

Khomfoi, Surin

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