Model the existing 220Kv Grid-Connected power station to explore the possibilities of connecting a battery energy storage on site.
The Issue – Model the existing 220Kv Grid-Connected power station to explore the possibilities of connecting a battery energy storage (BESS) on site.
We simulated different operating conditions and assessed the magnitude of losses across the HV Network.
Transformer on-load tapchanger (OLTC) altered for each load flow simulation to keep BESS point-ofconnection (PoC) HV Busbar within Voltage Tolerance.
Determined the magnitudes of MW and MVAr power flows at the Grid 220kV – PoC for each load flow stimulation.
Note: Red trace is ‘base’ dB reading & Purple trace is ‘asset’ dB reading.
An oil sample was taken from the transformer and assessed at site with DGA results showing no abnormal activity within, therefore, suggesting that the potential PD issue as most likely to be on the HV cable terminations of the transformer.
Implementation of an Operational Restriction (OR) to enforce further precautions on Persons for entry into the WTG.
Replacement of HV Cables and Terminations.
Defective assets were replaced before the defect had an opportunity to materialise into a disruptive failure.