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124 Hybrid-Renewable Energy Systems in Microgrids
Figure 7.5 (Continued)
Ks
2
GPRs=Kp+Kiss +w02 G () = K + s + i ω 2 0 (7.34)
s
PR
p
2
where K p and K i are the proportional and integral gain, respectively, and w 0 denotes
resonant frequency. This controller exhibits a high gain around the resonant frequency,
which is tuned at the fundamental grid frequency for a grid-connected converter. As
PR controller is frequency sensitive, it should be carefully designed considering fre-
quency response because even a small deviation of system frequency may diminish
