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In this paper, four current control strategies for voltage source PWM inverters with LCL-filter at extreme low pulse ratios (e.g. 80 Hz load frequency/600 Hz carrier frequency) are investigated. The system is a medium-voltage variable frequency drive (VFD) application with the power rating over 20 MW. The benefits and drawbacks of each scheme are summarized to provide a guideline for the current control...
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...
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