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Fig.21: Voltages and frequencies of Bus-600V and PCC with phase difference in second case.

Fig.22: Zero percent of negative sequence in second case

C. Third case study reveals a curtailment in renewable system, instructing it to switch from MPPT to PQ control
energy. When considering the real solar irradiation, mode, lowering the solar plant's output power (at time point
curtailment indicates that the PV array's production is 2.5 sec.) with a reference power of 400kW. At the 1 sec., the
decreased below what it could have been. A considerable module operates in grid following mode, then in islanded
load reduction is simulated in our test, resulting in a situation mode. Fig.24 shows solar irradiation, boost converter duty
where the electricity generated exceeds the microgrid's load ratio, voltages of PV and converter output and PV current.
requirement (large load was turned off). The BESS then
momentarily absorbs the excess power (as shown in fig.23 Fig.25 depicts the grid operating autonomously after
after 1.5 sec) and sends a signal to the PV array management time 1 sec. while preserving frequency stability at 50 with
delta phase, voltage at PCC and 600V-bus. Fig.26 shows the
negative sequence value in the third case study.