NDLI: Active damping of LCL resonance with minimum sensor effort by means of a digital infinite impulse response filter

Content Provider	IEEE Xplore Digital Library
Author	Dick, C.P. Richter, S. Rosekeit, M. Rolink, J. De Doncker, R.W.
Copyright Year	2007
Description	Author affiliation: RWTH Aachen Univ., Aachen (Dick, C.P.; Richter, S.; Rosekeit, M.; Rolink, J.; De Doncker, R.W.)
Abstract	This paper presents a concept for active damping of an LCL filter connecting a digitally controlled PWM converter to the grid. Active damping is performed by means of a digital Infinite Impulse Response (IIR) filter. Digital filters, being well known in digital signal analysis, can easily be implemented when using digital controllers and require very low computational effort. In contrast to active damping solutions found in literature, no extra quantities except the controlled current must be sensed. This functionality is proven via experimental results. After a short introduction of the problem and an overview of solutions found in literature, the implemented fundamental procedure for active damping is described. Subsequently, the main idea of using an IIR filter for active damping, being an approximation to a derivative function, is qualified and the design procedure is presented. In this paper it is stated that with this method the sensors are minimized and that due to the approximation of the derivative function the damping performance is lower compared to solutions found in literature. However, the damping effect by using an IIR filter is proven. The use of IIR filters and the reduction of sensor effort for active damping of EMI filters with multiple passives looks promising also for other applications with a known load.
Starting Page	1
Ending Page	8
File Size	781416
Page Count	8
File Format	PDF
ISBN	9789275815108
DOI	10.1109/EPE.2007.4417362
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-02
Publisher Place	Denmark
Access Restriction	Subscribed
Rights Holder	EPE Association
Subject Keyword	Damping DSP Passive filters IIR filters Pulse width modulation Converter control Digital filters Power harmonic filters Digital control Signal processing Active filters Active damping Resonance Equivalent circuits
Content Type	Text
Resource Type	Article

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