Highly Accurate Derivatives for LCL-Filtered Grid Converter With Capacitor Voltage Active Damping

  title={Highly Accurate Derivatives for LCL-Filtered Grid Converter With Capacitor Voltage Active Damping},
  author={Zhen Xin and Poh Chiang Loh and Xiongfei Wang and Frede Blaabjerg and Yi Tang},
  journal={IEEE Transactions on Power Electronics},
The middle capacitor voltage of an LCL-filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the capacitor current is then avoided. Relating the capacitor voltage to existing popular damping techniques designed with capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are… CONTINUE READING
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