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| A Stability Control Strategy for PWM Converter With Undamped LCL-Filter |
| Li Jun, Li Yuling, Chen Guozhu |
| College of Electrical Engineering Zhejiang University Hangzhou 310027 China |
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Abstract LCL filter is more and more widely used in PWM converter connected to the grid for its good filter performance. However, it can easily cause the system unstable due to resonances in the underdamping, which make it difficult to maintain the system stable without additional damping. The influence of the AC-side current sampling point and sampling frequency on the stability of current loop is systematically studied based on the mathematical model of the three-phase PWM converter with undamped LCL filter, and then a novel stability control strategy is proposed i.e. amplitude frequency characteristic and phase frequency of control object are improved by regulating sampling frequency to control phase-lag of digital system delay so as to achieve system stability. Simulation and experimental results effectively verify its validity and feasibility.
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Received: 31 August 2010
Published: 20 March 2014
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2012, Vol. 27 
