Appendix A: Methodology Tripping (anti-islanding and limits for sustained operation) calculation for BESS (Section 4.2.2.2) BESS tripping (anti-islanding and limits for sustained operation) curtailment while BESS could be discharging The tripping (anti-islanding and limits for sustained operation) curtailment when BESS could be discharging is calculated according to the steps described below: 1. Calculate BESS's storage capacity and minimum state of charge (SOC) changing over time
2. Identify instances where site is net-importing
3. Identify instances where BESS has sufficient SOC to discharge the net-imported energy
4. Identify instances where BESS remains inactive (zero power output) 5. For instances which satisfy Steps 2, 3 and 4, calculate curtailment as the net-imported energy that could have otherwise been provided by the BESS It is important to note the VPP operator may also limit BESS discharging and choose to reserve the BESS SOC due to an operational strategy such as the anticipated high spot market price event. This strategy may cause BESS to remain inactive during these instances. Since the dataset did not include any information regarding VPP operators’ operational decisions, it was not possible to separate instances of actual tripping from such operational decisions. For this reason, the method is likely to over-estimate the BESS tripping during potential discharge instances. This is a limitation of this study which should be addressed in future research.
BESS tripping (anti-islanding and limits for sustained operation) curtailment while BESS could be charging The tripping (anti-islanding and limits for sustained operation) curtailment when BESS could be charging is calculated according to the steps described below:
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