When many distributed generators (DGs) are connected to a distribution line, the upward power flow from DGs causes the difficulty in line voltage regulation. As the countermeasure, we propose several methods to control line voltages by use of DGs' reactive power outputs. Every proposed method using only DGs themselves is implemented in an autonomous decentralized way. So, these methods are distinguished from the other methods using power system apparatus in the centralized control over the power system. DGs with the function to estimate the line impedance provide the power system with reactive power according to the estimated impedance value, and regulate the line voltages. We evaluate the effect of the proposed methods for voltage compensation by simulation studies in two types of distribution system models.
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