Active damping control of grid-connected inverters with LCL filters based on over sampling

The resonant problem is essential for grid-connected inverters with LCL filters, then active damping methods are usually adopted. But the delay caused by digital control affects the active damping control dynamic response performance. In view of the above difficulties, on the basis of the active damping control scheme which based on capacitor voltage feedforward, oversampling is introduced. In a switching period, data is sampled and modulation signal is updated multi times. The control delay is reduced greatly. The scheme can improve active damping control dynamic response performance. Experiment results show that the proposed control scheme is correct and effective. © 2017, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.