Abstract
The active introduction of distributed generation and an increase in the number of grid-tied inverters in power supply systems in recent years, combined with the growth of modern microprocessor technology computing power, opens up opportunities to expand the inverter functionality in terms of filtering higher harmonics to ensure the power system electromagnetic compatibility. The paper considers a control system for a voltage source inverter of the virtual synchronous machine type with an integrated algorithm for active harmonics filtering of nonlinear load current according to the d-q theory. The developed algorithm has been tested using computer simulating in the Matlab/Simulink software package using the Simscape component library. As a part of the developed algorithm effectiveness evaluation, a comparison of the mains voltage and current harmonic composition in a scenario with complete correction absence, when using a classical parallel active filter and when using the developed algorithm with and without electric power generation to the grid was carried out. The positive effect of the developed algorithm on the harmonic composition of the grid voltage and current in a narrow range due to the presence of the inverter output capacitances is noted. The harmonic filtering algorithm uses the currently unused inverter power, so the filtering efficiency is inversely proportional to the useful electrical power generated by the inverter into the grid. Given the relatively high cost of the active filter kit, the proposed method of retrofitting the inverter may become a more preferable alternative due to lower capital costs. To implement the system, in addition to updating the inverter software, it will be necessary to add three measuring channels of the load phase current.
Keywords
active filters, distributed generation, grid-tied inverters, virtual synchronous machine
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