An assessment of voltage rise phenomenon on existing eThekwini Electricity low-voltage distribution network

Rising energy costs, growing public concern about environmental impacts of fossil fuel energy generating resources and energy constraints of utilities across the globe have increased the relevance and need for alternative renewable energy resources at the customers point of use. In South Africa, there is a strong interest from electricity suppliers and customers in rooftop photovoltaic systems connection onto the electricity grid, in contrast to utilization of expensive conventional energy storage devices. Specifically, small scale projects are being planned for the near future at municipal level. However, there are known technical issues associated with large-scale connection of rooftop PV systems in low voltage distribution networks and need to be studied in detail and addressed prior commission. This paper presents results of a technical investigation of interconnection of residential rooftop PV systems on an existing low voltage distribution network, implemented in DIgSILENT PowerFactory, representing a housing estate development at eThekwini Electricity.