Читать книгу Smart Solar PV Inverters with Advanced Grid Support Functionalities - Rajiv K. Varma - Страница 20

A balance between active power generation and the sum of loads and line losses results in a stable system frequency. Hence, active power exchange (injection/absorption) by IBRs and DERs with the power system directly impacts system frequency. In general, the system frequency increases with active power injection and decreases with active power absorption. The magnitude of frequency change is dependent upon the relative value of active power exchange in comparison with power generation from the remaining generators in the power system. Greater the active power exchange higher is the variation in system frequency. Consequently, the impact of DER active power exchange on microgrid system frequency is much larger than in grid connected environments. The impact of active power control on system frequency is briefly described in the next section.

Figure 1.6 Phasor diagrams for network with active power injection from the solar PV system; (a) network with X/R = 3; (b) network with X/R = 1/3.