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The assessment of step voltage regulator (SVR) operation in activedistribution networks requires computational analysis tools capable of tacklingthe emerging technical challenges. Conventional load flow (CLF), quasi-statictime series (QSTS) and dynamic simulations are typically employed toinvestigate high-penetration distributed generation (DG) interconnectionimpacts. Regarding the SVR runaway condition phenomenon, however, a consensushas yet to be reached on the most cost-effective simulation technique forcapturing and reproducing the correct sequence of events. This work presents acomparative study of the CLF, QSTS and dynamic simulation techniques throughmodelling and analysis of two SVR-controlled test-feeders, in order to evaluateeach approach performance in addressing scenarios of DG-caused reverse activepower flow. Detailed descriptions of feeder voltage profile and SVR tapoperations are provided to facilitate understanding of the mechanisms thatcharacterize SVR runaway condition, as well as the advantages and drawbacks ofeach of the studied simulation techniques.

Comparison between Conventional Load Flow, QSTS Simulation, and Dynamic  Simulation to Assess the Operation of Step Voltage Regulators in Active  Distribution Networks