Intelligent UPS Inverter Control Design Using Microcontroller

Abstract

This paper presents many control algorithms using microcontroller for an uninterruptible power supply (UPS) inverter, in order to provide pure sinusoidal wave 50 Hz, controlled by the PIC-microcontroller. The strategy is to utilize the PIC microcontroller and its special features in controlling the UPS inverter. The first approach accomplished with a classical control Proportional-Integral-Derivative (PID) algorithm. The second approach accomplished with the Fuzzy Logic Control (FLC). The third approach accomplished with nonlinear PID-fuzzy logic controller. The ability of the proposed scheme is validated via a successful implementation on a microcontroller-based UPS inverter. The proposed scheme has shown its robustness on low output voltage distortion, excellent voltage regulation, and it is insensitive to load variation, even under nonlinear loads. Experimental studies are performed to further validate the effectiveness of this scheme. This system may be used with grid-solar energy systems.

Keywords: PID Controller, Fuzzy Logic Control, Nonlinear PID-Fuzzy Logic, Takagi Sugeno, Microcontroller Applications