An Analysis on Relationship between Installable Capacity and Spatial Distribution of Distributed Generators under Customer-side Voltage Constraints in Medium and Low Voltage Distribution Networks:—In Case of the DG's Rated Output—

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The widespread installation of distributed generations (DGs) is crucial for making optimal utilization of renewable energy. However, distribution networks face voltage variation problems if numerous DGs are connected. The roof-top photovoltaic systems among distributed generators are connected to low-voltage distribution networks via service drop wires. Consequently, voltage-rise at low-voltage wires and service drop wires are significant because those wires have higher impedances than medium voltage wires. This paper proposes a methodology to analyse the maximum installable capacity of DGs for medium and low voltage distribution networks. In particular, customer-side voltage constraints in the Electricity Business Act can be applied to an evaluation of maximum DG installable capacity by considering low-voltage wires and service drop wires. In numerical simulations, maximum DG installable capacity is analysed on a basis of some spatial installation scenarios of DGs in distribution networks.