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This paper presents the investigation of damping concepts of the resonance oscillation of an LCL-filter in a PWM inverter as a variable-speed-drive with low pulse-ratio. The system is designed for general-purpose operation and should be connected to different machines working in mediumvoltage with a power of 22 MVA. Low current THD is required on the machine side, which makes the use of a filter necessary...
This paper explores the effect of the computation and pulsewidth modulation (PWM) delays on the capacitor-current-feedback active damping for the LCL-type grid-connected inverter. It turns out that proportional feedback of the capacitor current is equivalent to a virtual impedance connected in parallel with the filter capacitor in digital control. The LCL-filter resonance frequency is changed by this...
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