| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系博碩士班 === 103 === This study investigated the effect of increasing the penetration of low-voltage grid-connected photovoltaic (PV) systems on power distribution systems. File conversion software was employed to derive the feeder line topology and related electrical facility information of a distribution mapping management system (DMMS). A renewable energy management system was integrated into the DMMS to obtain input data for analyzing the three-phase power flow in the system to determine the voltage variation. The following factors were considered in the analysis: the installed capacity of the low-voltage PV, location and voltage levels of grid connections, distribution transformer types in the system (i.e., single-phase three-wire, three-phase three-wire, and three-phase four-wire systems), as well as the specifications and impedance of various conductors and service lines.
From the analysis, two control strategies were derived to ensure that the voltage variation at point of common coupling (PCC) to be less than 2.5%. First, an active power curtailment strategy was proposed to reduce the active power input into a feeder to prevent voltage rises. Second, a strategy for regulating the power factor of the inverter and preventing voltage rises was also proposed to increase the hosting capacity of low-voltage PV systems.
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