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This work investigates the impact of feeder bidirectional active power flowon the operation of two cascaded step voltage regulators (SVRs) located at a34.5 kV rural distribution feeder. It shows that, when active power flowreversal is possible both by network reconfiguration and by high penetrationlevels of distributed generation (DG), typical SVR control mode settings areunable to prevent the occurrence of runaway condition, a phenomenoncharacterized by loss of SVR voltage control capabilities. Such developmentsare the basis for a DG pre-dispatch control strategy that aims to avoid theadverse effects of the described power flow reversal scenarios, as well as toensure reliable operation of the utility distribution network.

Effects of Distributed Generation on the Bidirectional Operation of  Cascaded Step Voltage Regulators: Case Study of a Real 34.5 kV Distribution  Feeder