Experimental Investigation of the Frequency Response of an LC-Filter and Power Transformer for Grid Connection

The power delivered by a voltage source inverter needs to be filtered fulfill grid code requirements. A commonly used filter technology is the LCL-filter. An issue with LCL-filter occurrence of resonance peak, which can mitigated active or passive damping methods. transfer function often investigate frequency response system and propose use an LC-filter combined transformer form has not been extensively investigated. Therefore, study in this article introduces model for connection derived model. validated simulations experimental investigations. results from direct solution analytical overlap almost perfectly. magnitudes are approximately 1 dB lower than simulation before frequency. At frequency, 13.4 lower. however, occurs at same It also concluded that significantly damped.