Page 100 - IJOCTA-15-4

Viet Thanh et al. / IJOCTA, Vol.15, No.4, pp.625-648 (2025)

Figure 16. Impact of cloud cover on the output active power of Xuan Thien EaSup and Srepok 3 solar farms

Figure 17. The frequency response at various buses of the system. (a) Scenario 3. (b) Scenario 4

EaNam bus, which is the most affected, with a most affected with a frequency of 48.7102 Hz, ex-
frequency of 48.5538 Hz, exceeding the allowed ceeding the allowed frequency of 49 Hz.
frequency of 49 Hz.

4.3.2. Scenario 4 The frequency response at the EaNam bus,
The Dong Nai generator, with a capacity of 144 comparing the proposed method in this paper
MW, experienced a fault and disconnected from with the method introduced by Choi et al., 41
the power system. The frequency response of sev- is illustrated in Figure 18. The results indicate
eral buses in the Vietnamese Tay Nguyen 500/220 that the frequency response of all buses complies
kV system is depicted in Figure 17b. Based on with the grid connection requirements previously
the results, the frequency response at the EaNam, outlined. 40 Notably, the EaNam bus exhibits sig-
Pleiku, Pleiku 2, Pleiku 3, XuanThien-Easup, nificant improvements in both magnitude and re-
KrongBuk, Serok 3, and NhonHoa buses failed to sponse time. As shown in Figure 18a and b, using
meet the requirements set forth in Circular No. the proposed method, the frequency magnitude
25/2016/TT-BCT, dated November 30, 2016, by values are 49.03 and 49.183 Hz, respectively. Em-
the Ministry of Industry and Trade of Vietnam, ploying the method by Choi et al., 41 the values
which regulates the transmission power system. 33 are 49.07 and 49.143 Hz; and without applying
The most notable is EaNam bus, which is the BESS, the values drop to 48.5538 and 48.7102 Hz
642