Robust Voltage Control of a Single-Phase UPS Inverter Utilizing LMI-Based Optimization with All-Pass Filter Under System Uncertainty
(1) Heng Tang Mail (1) Faculty of Electricity, National Polytechnic Institute of Cambodia, Phnom Penh 120901, Cambodia. 2) Graduate School, National Polytechnic Institute of Cambodia, Phnom Penh 120901, Cambodia)
(2) * Chivon Choeung Mail (National Polytechnic Institute of Cambodia, Cambodia)
(3) Sarot Srang Mail (Institute of Technology of Cambodia, Cambodia)
(4) Bunne So Mail (National Polytechnic Institute of Cambodia, Cambodia)
(5) Socheat Yay Mail (National Polytechnic Institute of Cambodia, Cambodia)
(6) Panha Soth Mail (National Polytechnic Institute of Cambodia, Cambodia)
(7) Horchhong Cheng Mail (National Polytechnic Institute of Cambodia, Cambodia)
*corresponding author

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.

Keywords


Single-Phase Inverter; Linear Matrix Inequality; Uncertainty Model; All-Pass Filter; State Feedback Control; Integral Control; Digital Signal Processor

   

DOI

https://doi.org/10.31763/ijrcs.v4i2.1452 		      

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