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Almousawi & Aldair                                                                                           |9
                                  (a)                                       (a)

(b) (b)

(c) (c)

                                 (d)                                                            (d)
                                                              Fig. 12: Simulation results for decreasing PV generation (a)
                                  (e)                         Irradiation (b) Active power (c) SOC of BESS (d) Voltages

                                  (f)                                                  of DC Bus & PV.
Fig. 11: Simulation results for increasing PV generation (a)
Irradiation (b) Active power (c) SOC of BESS (d) SOC of       E. Fifth Scenario: SOC Regulation
 SC (e) Voltage of BESS & SC (f) Voltages of DC Bus &
                                                              If the SOC reaches its maximum value (90%) as shown in
                                 PV.
                                                              Fig. (13a), the operation of the controller focuses on
                                                                            tnhoete"d'*(thaawt athyefr"o'*m(
                                                              regulating                                      the MPPT    as illustrated in Fig.
                                                              (13b). It is                                    rises from  204 V to 236.6V.

                                                              Corresponding to the new reference voltage, the #'( as
                                                              illustrated in Fig. (13c) decreases to 3528 W to achieve the

                                                              power balance in the hybrid system as well as discontinuing

                                                              the BESS from charging. The BESS reacts quickly when the

                                                              load power increases, to accommodate the new load.

                                                              Therefore, the SOC is reduced to less than its maximum

                                                              value and the PV panel is forced to operate back with MPPT.
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