Broxburn & Cathkin — SSO Studies
SSO studies for 2x 49 MW BESS sites connected at 33 kV
The challenge
NESO had recently introduced a new requirement for SSO studies on new generation sites connected to the transmission network, catching many developers by surprise. Aurora was tasked with reviewing the guidance, taking the existing EMT models and undertaking an SSO study.
What Aurora did
We reviewed the initial NESO guidance and challenged the validity and practicality of the requirements, since a literal interpretation would have required more than 10,000 simulation studies. Even with scripting and automation, the processing and analysis time would have been unrealistic. We discussed the requirements with NESO and agreed a simplified set of requirements and a more appropriate method, while liaising directly with the inverter and PPC manufacturers to understand the system response.