Abstract
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.
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