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All Journal International Journal of Robotics and Control Systems Control Systems and Optimization Letters
Choeung, Chivon
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Aerospace Engineering Automotive Engineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering

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Robust Voltage Control of a Single-Phase UPS Inverter Utilizing LMI-Based Optimization with All-Pass Filter Under System Uncertainty Tang, Heng; Choeung, Chivon; Srang, Sarot; So, Bunne; Yay, Socheat; Soth, Panha; Cheng, Horchhong
International Journal of Robotics and Control Systems Vol 4, No 2 (2024)
Publisher : Association for Scientific Computing Electronics and Engineering (ASCEE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31763/ijrcs.v4i2.1452

Abstract

This paper proposes a systematic control design for a single-phase LC-filtered inverter considering uncertain system parameters. One major difficulty in controlling single-phase power converters is the lack of a direct conversion method for transforming single-phase signals into dq-frame signals. By employing an all-pass filter in this proposed approach, it is possible to control the output voltage in terms of DC quantity or the dq-rotating frame. Furthermore, voltage stability and harmonic distortion (THD) minimization of the uninterruptible power supply (UPS) are major concerns in inverter design. Therefore, this controller uses integral action to get rid of steady-state errors and stabilize the closed-loop system by the state feedback control. In order to enlarge and guarantee the stability range in the presence of potential parameter fluctuations, an uncertainty model is being considered. In this context, the uncertainty models refer to the potential model with variations in the filter's inductance and capacitance caused by operating temperature, aging, and various external factors. The efficacy of the control approach is assessed through simulations and experiments, with the objective of comparing its results with those of the PI control using a control board featuring a TMS320F28335 digital signal processor. Consequently, the proposed approach offers lower THD at every load step with lesser afford in performance tuning in comparison to the PI method.
Power Regulation of a Three-Phase L-Filtered Grid-Connected Inverter Considering Uncertain Grid Impedance Using Robust Control Yay, Socheat; Soth, Panha; Tang, Heng; Cheng, Horchhong; Ang, Sovann; Choeung, Chivon
International Journal of Robotics and Control Systems Vol 4, No 2 (2024)
Publisher : Association for Scientific Computing Electronics and Engineering (ASCEE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31763/ijrcs.v4i2.1406

Abstract

Uncertain grid impedance is often common in power distribution networks; therefore, it is crucial to design an efficient controller in this situation.  An issue that frequently occurs is the problem of unpredictable grid impedance, which can cause voltage fluctuations, power quality problems, and potential damage to equipment. This work provides a systematic control strategy to tackle these issues by supplying well-regulated power from a DC source to an AC power grid. A linear matrix inequality (LMI)-based robust optimal control is proposed in this paper to provide stability to the inverter system without offset error at the output side. The convergence time to steady state is minimized by solving the LMI problem to maximize the eigen value of the closed-loop system with the inclusion of the uncertainty of the filter parameter and grid impedance. Furthermore, the uncertainties in this study include the potential variation of values for the filters and the grid's impedance. These uncertainties occur because the grid impedance can fluctuate fast in the event of a fault or termination of a transmission line, while the filter's impedance can also be affected by changes in operating temperature. The simulation study of this proposed control includes a comparison between wide and narrow uncertainty ranges, as well as a performance comparison under uncertain parameters. Furthermore, this approach exhibits a lower power ripple in comparison to existing PI control method.
Inner Loop-Based Robust Control Design Considering Uncertain Grid Impedance for a Single-Phase AC–DC Converter In, Sokvan; Choeung, Chivon; San, Sokna; Yay, Socheat; Siren, Seven; Srun, Channareth
Control Systems and Optimization Letters Vol 4, No 1 (2026)
Publisher : Peneliti Teknologi Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59247/csol.v4i1.293

Abstract

Single-phase AC–DC converters based on an H-bridge active rectifier topology are widely used in applications such as electric vehicle charging and renewable energy interfaces. To achieve zero steady-state error using integral control, it is essential to regulate the output in the dq-synchronous frame. A key challenge in controlling single-phase power converters is the inability to directly convert single-phase signals to dq-frame signals. This paper proposes the use of a digital all-pass filter to generate β-signals, which provide the orthogonal component required for dq-transformation in single-phase systems. The control strategy involves an outer loop proportional–integral (PI) controller for regulating the output DC voltage, while an inner loop a linear matrix inequality (LMI)-based robust state-feedback controller with integral action is employed to regulate the AC current. The dq-frame transformation enables effective current regulation, while the robust control law ensures closed-loop stability based on Lyapunov function in the presence of parameter uncertainties. The robustness of this control approach is demonstrated by considering system uncertainties, including variations in the filter inductance with nominal value 3 mH, and the effectiveness of the proposed control is confirmed through simulation results under different resistive load conditions, demonstrating stable operation and accurate DC voltage regulation. Future work will focus on experimental validation of the proposed control strategy and investigation of converter performance under grid disturbance conditions such as voltage unbalance and harmonic distortion.
Co-Authors Ang, Sovann Cheng, Horchhong In, Sokvan San, Sokna Siren, Seven So, Bunne Soth, Panha Srang, Sarot Srun, Channareth Tang, Heng Yay, Socheat