Parameter-driven strategies to analyze fault ride through capability of synchronous generator

In this work, an equation-based (EB) investigative approach is undertaken through detailed twoaxis dynamic modelling as a white box model that provide full access to all the parameters. EB simulations have been performed that comprehensively analyse the Critical Clearing Times

(CCT) and Critical Clearing Angles (CCA) during grid-code-defined faults. Some of the results are also verified using a black box commercial software (Com.) sensitivity analysis that has been used for evaluation includes Internal generator parameters like inertia H; excitation ceiling factor (C.F); terminal voltage (Vt); and pre-fault reactive power or power factor (P.F); transformer reactance (Xt). External grid factors: external line reactance (Xe). Reinforcement technologies: fast valving (Fv) and braking resistors (Br), with an optimization insight about resistor configuration and sizing.

The results show a key system-level observation that the internal generator changes yield improvement in CCT values, while factors related to external grid-side also can provide leverages. Actions like fast valving and braking resistors can significantly improve the FRT capability. These actions become effective at a certain operation time and size which can be optimized. This work provides a structured framework that deliver understanding and thereby guide the producer to find the most cost-efficient solution to fulfil the requirements.