Wongvanich, Napasool

Preferred name

Alternative Name

Wongvanich, N.

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School of Engineering

napasool.wo@kmitl.ac.th

Now showing 1 - 10 of 23

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A Novel Practical Fixed-Time Speed Control of Permanent Magnet Synchronous Motors with Input Saturation
(2025-01-01)
Cholahan, Varin
;
Wongvanich, Napasool
;
Tangsrirat, Worapong
In this article, we focus on a control problem for the speed control of a permanent magnet synchronous motor (PMSM). An antisaturation adaptive fixed-time nonsingular sliding mode control (AFFTNSM) with disturbance estimation compensation is designed for a class of second-order nonlinear systems to improve PMSM system performance. Firstly, a novel fast fixed-time nonsingular sliding mode surface is chosen based on the error dynamic equation. Then, a practical fixed-time sliding mode control algorithm is proposed where the stability of the proposed controller is demonstrated to show the convergence of the velocity tracking error to a neighborhood of the origin in fixed-time. The implementation of feedforward compensation of disturbance enhances the dynamic performance of the fast fixed-time nonsingular sliding mode control rule, resulting in reduced chattering phenomena. Numerical simulation results are provided to verify the efficiency of the proposed method.
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Model based control of the heat exchanger system with accumulative heat reservoir
(2019-10-01)
Ahpichitpongchai, Panuwat
;
Kamonwattana, Kamonchanok
;
Intarit, Wiriya
;
Wongvanich, Napasool
;
Kongratana, Viriya
This paper designs a model based control system for the heat exchanger system with accumulative heat reservoir. The heat exchanger system was firstly modelled through the set of five differential equations, that also take into account the heat accumulation inside the reservoirs. Temperature data was obtained through the use of a temperature sensor (LM 35) which is connected to LabView through a DAQ. The collected data was then processed using an integral based method to determine the parameters of the heat exchanger system. The appropriate PID gains are selected by pole placement methodology. Results show that the set of PID gains that were determined through the use of calculations outperformed the arbitrary chosen set of gains.
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PLC-based industrial temperature controller with different response times
(2017-12-13)
Gulpanich, S.
;
Krongratana, V.
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Srimuang, Arthit
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Tipsuwanporn, V.
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Wongvanich, N.
This work presents a temperature control of industrial ovens using block FB58 'TCONT-CP' from the Siemens S7-300 PLC, which is evaluated by the OB35 interrupt. Two plants were considered. The first plant was a small industrial oven made of aluminum of size 1.5 cm × 5 cm and taking in 60 W of heat. The second plant was a large industry oven with a 0.125 m<sup>3</sup> capacity, capable of exuding 1500 W of heat. Both experiments were controlled by the same Block Command and ovens were tested separately. The Cohen-Coon PID tuning method was firstly applied to both plants, with a separate controller values being obtained for each plant. These values were kept fixed throughout the experiments. A tailored approach was adopted whereby a pulse gen was used in conjunction with the PID control for the small plant; whereas a control zoning was used for the larger plant. Result show that the tailored approach yielded significant improvements in settling times compared to a conventional PID controller.
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System identification of the two tanks system subjected to WirelessHART delays
(2018-12-10)
Wongvanich, Napasool
;
Somkane, Pongsakorn
;
Kongratana, Viriya
This paper proposes an integral-based method for parameter identification of the coupled tank model used in level control. The plant uses WirelessHART communication protocol to interact between devices in the system, which has a data update rate of 8 seconds, causing time delay impacting the stability of the control system. Two models are considered. The first model is the simple linear model where the delay from the WirelessHART is assumed to be negligible. The second model extends this first model, and introduces nonlinearity from the WirelessHART delay into the model. Results showed that although the both the linear and non linear models provides a good match to the WirelessHART-affected plant responses, the nonlinear model provides on average a 25% better match than the linear model. This model and method can be used to design a more effective controller to combat the WirelessHART induced delay systems.
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Simplified Modeling Approach to Characterize Sudden Load Disturbances in WirelessHART FOPDT Systems
(2018-12-18)
Wongvanich, Napasool
;
Pongsumpun, Puntani
This paper presents the simplified modelling approach to characterize sudden load disturbance in WirelessHART™. Two approaches are presented. The model was firstly formulated through Laplace transformation, where the resulting integral equation renders non-linear optimization problems into simple linear optimizations. Experiments were conducted on a coupled tanks system connected through the WirelessHART™ protocol. Based on the initial fit to the experimental results, the second model then places two locally affine relationships, one for the load flow disturbances, and the other for the level measurements to the responses. The extended locally affine model gave on average a 25% reduction in errors, compared to the Laplace-based method, while better captured the non-linear effects resulting from the WirelessHART™.
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Observer-less Fixed-Time Speed Control For Permanent Magnet Synchronous Motors with matched-mismatched disturbances
(2025-01-01)
Cholahan, Varin
;
Wongvanich, Napasool
;
Tangsrirat, Worapong
This paper presents a state-dependent Variable Exponent Coefficient Sliding Mode Control (VECFSMC) By inducing fixed-time stability analysis, the proposed state-dependent sliding surface provides not only system stability but also a quick response in a fixed period of time as well as counteract with matched and mismatched disturbances. The proposed sliding mode control strategy does not use observers to estimate the disturbances. The designed sliding mode surface possesses robustness properties which is sufficient to cope with both matched and mismatch disturbances in a period of fixed time. Firstly, the mathematical model of permanent magnet synchronous motor and the mathematical background of variable exponent coefficient are demonstrated theoretically. Secondly, the state-dependent sliding surface with variable exponent coefficient is designed. The controller that can manipulate both the speed of PMSM and matched-mismatched disturbances is constructed. Lyapunov function is applied to assess the stability of the proposed method. Finally, a numerical simulation with PMSM drive shows fast convergence, good robustness against both matched and mismatched disturbances. The proposed fixed-time controller with this observer-less method offers high efficiency and offers not too complicated control solution comparing to the other fixed-time and finite-time methods with a small number of parameters.
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Agricultural Mobile Robot Body Vibration Characterization Using Integral Based Methodology
(2019-04-01)
Boksuwan, Sungwan
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Chesof, Abdulhafiz
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Wongvanich, Napasool
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Panaudomsap, Sumit
This paper presents the application of integral based method for characterization of the vibration in the four-wheel agricultural mobile robot, which is designed for use in applications such trimming, spraying and harvesting. Vibration occurs when one of the wheels does not touch the ground which reduces an effective of end effector. In order to design an effective controller, an accurate mathematical model is needed. Results show that the proposed method can simplify the system identification procedure, while yielding excellent match in comparison to the standard black box method. The proposed algorithm gave an NRMSE match of 96.8%, while the standard method yielded a 76.1% match. This match is also found to be lower when the validation data was from other experiments.
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Robust Practical Fixed-Time Control and Application to DC-DC Buck Converter
(2024-01-01)
Wongvanich, Napasool
;
Cholahan, Varin
;
Tangsrirat, Worapong
This work presents an adaptive fixed-time speed controller of permanent magnet synchronous motors for a class of second-order nonlinear systems based on practical fixed-time stability, in which a sliding mode surface with a constant exponent coefficient is designed to avoid singularities and achieve a fast convergence rate. This method is easy to implement compared to other sophisticated fixed-time controllers. In addition, the upper bound of control inputs is selected to prevent saturation limitations. Following that, the Lyapunov function expresses the close-loop stability of a practical fixed-time controller. An adaptive disturbance rejection with smooth function is presented to attenuate the total disturbances, chattering, and steady-state error. The tracking error is integrated into a bounded residual region within a specified time. Finally, numerical simulations are given to verify the performance of both controller and disturbance rejection mechanisms.
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A study of flow-level cascade control with WirelessHARTTM transmitter using LabVIEW
(2017-12-13)
Somkane, Pongsakorn
;
Kongratana, V.
;
Gulpanich, S.
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Tipsuwanporn, V.
;
Wongvanich, N.
This work presents a cascade control architecture to combat network induced delays in Wireless network controlled systems. Specifically a flow-level cascade control system is considered whereby the primary process variable is liquid level, and the secondary process variable is the flow rate. The flow-level process variables are measured by Wireless HART differential Pressure (DP) transmitter and sent through a WirelessHART gateway. Control actions are provided by a control valve actuator which is manipulated through a PLC. The PLC and the WirelessHART gateway are managed by an OPC server providing a medium of communication. The PID controller gains are designed through the LabView software, in which the network induced delays is offset by adjusting the controller interval until the responses are satisfactory. Results show that cascade control outperformed the single loop control, in both handling network induced delays and coping with disturbances.
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Integral-based algorithm for parameter identification of the heat exchanger
(2018-01-01)
Wongvanich, Napasool
;
Kongratana, Viriya
This paper develops an integral based method for the system identification and modeling of the heat exchanger. The proposed method formulates the model through the use of integrals, thus rendering a nonconvex optimization problem into simple linear optimization which can be solved through an ordinary least squares method. The convection heat exchanger model is firstly assumed, whereby all the inlet and outlet temperatures are measured or known. Two experiments were conducted. The first involved a series of step responses with incremental heating input, whilst the second involved step responses taken only after the system has cooled down to room temperature. Results show that the proposed method allowed a more complicated model of the heat exchanger to be constructed, whilst still being robust to Gaussian and quantization as well as encoder noises.

Wongvanich, Napasool

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