Integration of Dynamic Security Assessment and Stability Controls

Dynamic security assessment (DSA) or transient security assessment (TSA) determines a system’s ability to survive contingencies with a safety factor (margin). To ensure that a system remains dynamically secure, preventive or corrective remedial actions are designed. Preventive actions are applied in the pre-contingency system so that after any credible contingency the system remains secure. Examples include restrictions on interface flows, angle differences across a particular interface, and total generation out of a plant. Corrective remedial actions (stability controls) are those taken following a contingency. Examples include generator or load tripping, and capacitor bank or reactor switching.