Читать книгу Active Electrical Distribution Network - Группа авторов - Страница 86

The response of the DSTATCOM-BESS system with an unbalanced induction motor (IM) load is depicted in Figure 4.18. It has been visualized that it draws a heavy inrush of current, leading to voltage disturbances. These disturbances were effectively minimized using the proposed DSTATCOM-BESS system by injecting the dynamic reactive power at PCC to regulate the voltage. Similar to previous loading conditions, load unbalancing is created, and it was found that the PCC voltage remains constant during an IM load. During this condition, the terminal voltage is also kept at its reference voltage and the battery starts charging. The grid side and load side harmonics are depicted in Figures 4.19 and 4.20, respectively. The obtained harmonics are well under the international standard IEEE519-2014. Moreover, Table 4.2 illustrates the harmonics-based comparative analysis of all considered loads. The perceived results reveal the performance of the DSTATCOM-BESS system.

Figure 4.18 Response of DSTATCOM-BESS under an unbalanced motor load.

Figure 4.19 Source side frequency spectrum.

Figure 4.20 Load side frequency spectrum.

Table 4.2 Harmonics analysis under load unbalancing.

S. No.	Type of load	Indirect current control theory controlled DSTATCOM-BESS
Source side THD	Load side THD
1	Linear load	0.71%	0.71%
2	Nonlinear load	0.19%	30.25%
3	Motor load	0.31%	2.43%