Page 10 - IJEEE-2023-Vol19-ISSUE-1

6| Almousawi & Aldair

illustration is in Fig. (6). the flowchart of ABC is illustrated operation are explained as active power, and SOC of BESS
as shown in Fig. (9b). At the second step (between 3 and 6
in Fig. (7). s), the small difference between #)*+, and #'( indicates that
the HESS losses are very low. In Fig. (9c), the SC is
TABLE II: discharged when the power load is increased according to the
HFC in the proposed controller. According to Fig. (9d), the
ABC PARAMETERS ". is decreased when the power demand increases because
the BESS is discharged while the "-& small change and
Parameters value returns to the nominal value.

Number of bees 40 B. Second Scenario: Decreasing in Power Requirement

Maximum iteration number 50 The controller tested with power demand decreasing as
shown in Fig. (10a). It can be noted that the three cases of the
Dimension 10 hybrid system with the normal operation are explained as the
active power, and SOC of BESS as shown in Fig. (10b). In
Limit 5 Fig. (10c), the SC is charged when the power load is
decreased according to the HFC in the proposed controller.
Scout production period 5 According to Fig. (10d), DC voltage is operated with
nominal value (400V). The ". is increased when the power
Fig. 6: The Best Cost Function of ABC Algorithm. demand decreases because the BESS is charged as illustrated
in Fig. (10e).
The result of PI controllers is given as: -
C. Third Scenario: Increasing in PV Generation
PPIPI_I_V_1CCC=== 1 0. 40.06.01312sss4ss+s++8639877
PPI_I2_3== 0 0.0.3453ssss++907.635 When the irradiance changes, that effect on the power
produced from the PV array. Fig. (11a) depicted the
VI. SIMULATION RESULT simulation outcome when the PV irradiance was adjusted in
four steps within 12 s.
The proposed control strategy and energy management are According to Fig. (11b) shows that the PFG < PH!BC through
tested using MATLAB simulation. To demonstrate the the first 6 second. As a result, the BESS is discharged to
compensated power produced by SC, it is first compared to regulate the DC link voltage as illustrated in Fig. (11c).
a conventional control strategy in [35] as shown in Fig. (8), PFG = PH!BC during the third step, thus, the BESS converters
the power density increases by more than 56% and DC link are turned off for charging/discharging. The small difference
voltage operating with prelimited range (±2%). Then, tested between PH!BC and PFG indicates that the HESS losses are
the system operation using four scenarios; increasing in very low. The solar radiation increases further during the
power requirement; decreasing in power requirement; fourth step. So, the BESS will absorb the power via charging
increasing in PV generation, and decreasing in PV converter.
generation. Additionally, the SOC regulation is examined. In Fig. (11d), the SC is charged when the PV generation is
increased according to the HFC in the proposed controller.
A. First Scenario: Increasing in Power Requirement The BESS voltage is increased when the BESS is charged as
The hybrid system is simulated for 9 s and the controller illustrated in Fig. (11d). According to Fig. (11f) the DC link
examined with power demand increasing as shown in Figure voltage small decreased at each step within the prelimited
(9a). SOC is set to 50%. values and return to specified reference with less than 20 ms.
It can be noted that the three cases of the hybrid system (#'(
> #)*+, , #'( = #)*+, , #'( < #)*+, ) with the normal D. Fourth Scenario: Decreasing in PV Generation

Fig. (12a) showed the simulation outcome when the PV
irradiance was decreased in four steps within 12 s. According
to Fig. (12b) shows that the PFG > PH!BC through the first 6
s. As a result, the BESS is charged to regulate the DC link
voltage as shown in Fig. (12c). The PFG = PH!BC during the
third step. Thus, the BESS converters are turned off for
charging/discharging current.
The small difference between #)*+, and #'( indicates that
the HESS losses are very low. The solar radiation decreases
further during the fourth step. So, the BESS will supply the
power via discharging converter. According to Fig. (12d),
the DC link voltage small increased at each three steps within
the prelimited values and return to setpoint. VFG operating
with MPPT and small change with each step to satisfied the
maximum #'(.