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| An Active Damping Method of Virtual Resistor in Parallel With Capacitor |
| Wu Xiaojie1, Sun Wei1, 2, Dai Peng1, Zhou Juan1 |
| 1. China University of Mining and Technology Xuzhou 221008 China; 2. China Electric Power Research Institute Beijing 100192 China |
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Abstract The rectifier connected to supply network with an LCL filter is more effective and reduce harmonic distortion at lower switch frequency than an L filter. However an LCL filter will bring stability problem. This paper shows the present damping methods include passive damping with a resistor and active damping algorithm and gives the advantages and disadvantages of these methods. Then the paper shows a new passive damping with a resistor parallel to the filter capacitance and prove it’s validity through ripple current attenuation function for the first time. Then based on virtual resistor concept, this paper gives a new active damping method. Simulation results are provided to prove the validity of this method.
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Received: 21 January 2009
Published: 04 March 2014
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2010, Vol. 25 
