A Single-Phase Inverter Parallel Operation System Based on STM32

This system aims to design and construct a parallel system composed of two single-phase inverters to provide power to resistive loads or connect to the 220V power grid. The system mainly consists of SPWM control module, control driver module, inverter bridge circuit module, filtering module, phase-locked loop module, and display module. The experiment uses STM32F103 as the main controller, combined with IRS2104 driver module to build the system. In the experiment, the inverter bridge circuit module and LC filter are chosen to provide stable power output, improve the stability of the output voltage, and reduce harmonic distortion. The system can output a single-phase 50Hz sine wave current, the load line voltage meets the requirements of
$(\mathbf{24}+\mathbf{0.2})\mathbf{V}$
, and
$\mathbf{THD} \leq \mathbf{2}{\%}$
, efficiency is
$\geq \mathbf{88}{\%}$
, and the load adjustment rate is
$\leq \mathbf{2.2}{\%}$
, achieving the basic requirements. After powering both single-phase inverters simultaneously, the absolute error measured by the data is less than 6% of the set value, and the absolute value of the relative error is not greater than 5%.