Dezso Sera, Tamas Kerekes, et, al. Low-cost digital implementation of proportional-resonant current controllers for PV inverter applications using delta operator. IEEE, 2005: 2517-2522.
Teodorescu R, Blaabjerg F, Liserre M, et al. Proportional-resonant controllers and filters for grid-connected voltage-source converters[J]. IEE Proceedings-Electrol Power Application 2006, 153(9): 750-762.
[10]
Blaabjerg F, Borup U, Liserre M. A new control structure for grid-connected LCL PV inverters with zero steady-state error and selective harmonic compensation. IEEE., 2004: 580-586.