Figure 39 Monthly distribution of generation curtailed by V-VAr characteristic for the 100 Solar Analytics sites with highest VArs
6.3.4 Volt-var curtailment (scenarios) In previous sections, it was seen that the majority of BESS and D-PV inverters do not show any V-VAr response. Therefore, the obtained V-VAr curtailment results are not representative of the ideal case where each BESS and D-PV inverter would show the required V-VAr response according to local voltage conditions and relevant standards. The V-VAr scenario analysis conducted tries to address this point and aims to present results that are more representative of DER future where majority of BESS and D-PV inverters are installed with the respective V-VAr response mode by default. The scenario analysis results are firstly presented for BESS systems from AGL dataset followed by D-PV systems Solar Analytics dataset.
6.3.4.1 AGL dataset Similar to the V-VAr curtailment analysis applied on real operational data from BESS, V-VAr scenario analysis is carried from both energy user’s and aggregator’s perspective. Figure 41 shows the distribution of percentage of total generation curtailed by V-VAr according to the studied V-VAr curves (see Figure 9) from the energy user’s perspective. The results are presented alongside the real measured data. The following Table X presents the key summary statistics for each distribution. It is seen that V-VAr curtailment from the energy user perspective is higher under the modelled V-VAr scenarios compared to the actual case. However, V-VAr curtailment is still insignificant, less than 1% of total generation under all analysed scenarios. Amongst the four analysed V-VAr curves, the ENA recommendation results in the highest amount of V-VAr curtailment and AS 4777-2015 results in the smallest amount of V-VAr curtailment.
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