Читать книгу Smart Solar PV Inverters with Advanced Grid Support Functionalities - Rajiv K. Varma - Страница 26

The largest credible contingency is described by NERC Reliability Standard BAL‐003 (Resource Loss Protection Criteria) [9]. It is typically the loss of the largest generating unit or a combination of generating units or a large transmission tie line. This largest contingency results in the maximum imbalance between generation and loads.

Larger the size of the contingency, larger will be the reduction in system inertia and consequently, a steeper and more negative ROCOF will be experienced. On the other hand, if the inertia of the lost generator is small relative to the total inertia in the power system, the ROCOF will not be as steep. This will be beneficial for the power system.