Abstract
In recent, smart inverter is focused on as a solution for the problems on voltage and frequency stability caused by mass introduction of PV. Smart inverter has many functions to keep voltage and frequency within the proper range. Its effectiveness significantly depends on which function is activated but it has not been clarified sufficiently. This paper investigates influence on voltage and frequency of combined use of voltage regulation function and frequency regulation function of smart inverter. In the analysis, smart inverters connected to transmission network and ones connected to distribution network are modeled separately, and appropriate function activation in each network is investigated. Results of simulation study shows that precedence setting in the combined use of multiple function sometimes makes interference among them and deteriorates performance of smart inverter. The dependencies on the performance of introduction in transmission and distribution network by the analysis, and importance of selection of activating function considering introduction amount in transmission and distribution network is recognized.
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