Abstract
This paper describes a voltage regulation method for dispersed grid-connected
PV systems under high-density connection. In the near future, many
PV systems will be connected to distribution systems. The reverse
power flow of the grid-connected PV systems will raise line voltage
to the upper limit of the legal voltage range. In the first part
of this paper we examine the voltage characteristics of a distribution
system under high-density connection, while the second part of the
paper describes a voltage regulation method for high-density PV connections,
using reactive power proportional to global irradiance. The results
of tests clearly demonstrate a restraining effect on voltage during
the daytime and a smoothing effect on voltage fluctuation.
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