Autonomous inverter for single-phase active filter of harmonic distortions in ship power network

Abstract

The article focuses on the problem of documentary control of the level of harmonic distortions in the ship power network. It has been proposed to use active filters to improve the quality of electric flow on board a ship. There is given a block diagram of the active filter. The methods of designing power electronic devices have been studied. A device for converting DC voltage into sinusoidal AC was designed on the platform of the STM32F4 debug board. The device includes a control system, power amplifiers, short circuit protection and power switches. A low power transformer is provided to convert voltage levels. The controller software was developed using the MATLAB / Simulink software package, and the board was debugged and flashed. Comparison of the device stability and the generated signal quality at different carrier frequencies has been made. It has been stated that the software for the device operation consists of two levels: the lower (code to the microcontroller) and the interface (which communicates and transfers data in real time to a personal computer). Oscillograms of voltages and currents at key points of the converter's electrical circuit are shown. The data obtained from the operation of the device made it possible to evaluate the assembly quality and to determine the scope of application of the developed device. The device is capable of generating a signal of a given frequency and amplitude including interharmonic components, which makes it possible to use it as an active current filter for power systems on ships.