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This is not so much a PSSPY question, but I will say that, at higher voltages, passive reactive devices (switched caps for example) will contribute more reactive power. A transformer LTC might be set to maximize capacitor voltage and thus get higher reactive performance. In many cases LTC tap position will be different for leading and lagging cases. For reactive capability validation, it is better to set transformer taps where aggregate plant reactive output meets criteria over the entire range of operating voltages. Apart from transformer taps, one must also consider allowable range at PV inverter terminals and collector equipment.

What did you mean by "LTC movement is not even on the dynamic range"?