Open AccessDesign of Photovoltaic Inverter Based on STM32 Microcontrollers
Author(s) -
Wei-Tai Hsu,
Jing-Feng Fang,
Chia-Wei Huang
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/644/1/012013
Subject(s) - inverter , stm32 , photovoltaic system , microcontroller , microprocessor , pulse width modulation , harmonic , grid tie inverter , electrical engineering , computer science , electronic engineering , voltage , maximum power point tracking , engineering , chip , physics , quantum mechanics
In this paper, the STM32 microprocessor is used as the central control core, and a 500W photovoltaic inverter is designed. The inverter adopts a two-stage conversion structure. The high-speed timer of the STM32 microprocessor generates high-resolution PWM and SPWM pulses and drives the first-stage DC/DC convertor after driving the chip through UCC27324 and IR2111 respectively. The rectification and the second-stage DC/AC inverter convert the DC signal into a utility frequency. In order to reduce the higher harmonics derived from the DC/AC inverter, the circuit also adopts the principle of LC filter design. Finally, in the Multisim simulation, the operation is stable. The error of the output AC voltage is controlled within 3%. It is said that the inverter has the advantages of high reliability, low harmonic content, and high efficiency.