NDLI: Observer based active damping of LCL resonance in grid connected voltage source converters

Content Provider	IEEE Xplore Digital Library
Author	Miskovic, V. Blasko, V. Jahns, T. Smith, A. Romenesko, C.
Copyright Year	2013
Description	Author affiliation: United Technol. Res. Center, East Hartford, CT, USA (Blasko, V.) \|\| Univ. of Wisconsin Madison, Madison, WI, USA (Jahns, T.) \|\| Danfoss Power Electron., Loves Park, IL, USA (Miskovic, V.; Smith, A.; Romenesko, C.)
Abstract	Voltage source converters (VSC) with LCL filters are attractive in grid connected applications because they greatly reduce pollution of the utility voltage due to switching harmonics. However, LCL network has very low impedance at frequencies close to resonance and therefore even small voltage magnitudes at those frequencies can excite currents of large magnitudes or even cause instability. In this paper novel current controller structure is proposed that uses Luenberger observer as a sensor replacement and state predictor to predict filter capacitor current which is passed through virtual resistor to create damping effect. Predicted filter capacitor through virtual resistor is inner fast loop, while outer loop with appropriate feedforward terms ensures fast command tracking and zero steady-state error. The use of the observer alleviates the impact of sampling delay which greatly improves active damping capability and eliminates the need for additional sensors. This paper with simulation and experimental results demonstrates true active damping and the effectiveness of the virtual resistance in actively stiffening input impedance of AFE drive at frequencies close to resonance.
Starting Page	4850
Ending Page	4856
File Size	981498
Page Count	7
File Format	PDF
ISBN	9781479903368
DOI	10.1109/ECCE.2013.6647353
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Damping Current measurement Capacitors Resonant frequency Observers Harmonic analysis Power harmonic filters
Content Type	Text
Resource Type	Article

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