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134 Hybrid-Renewable Energy Systems in Microgrids
Figure 7.7 (Continued)
in this way, an extremely accurate synchronization system is required so that these
converters can operate in parallel [13]. Droop control is used in Fig. 7.9B to form
the voltage amplitude and frequency references, which resembles a controlled AC
source. Typically, the droop characteristics are represented by:
*
meas
fref=f*−mP*−Pmeas f ref = f − mP ( * − P ) (7.54)
meas
Vref=V*−nQ*−Qmeas V ref = V − nQ ( * − Q ) (7.55)
*
