Worst case scenario for large distribution networks with distributed generation

Integration of distributed generation (DG) in distribution network has significant effects on voltage profile for both customers and distribution network service providers (DNSPs). This impact may manifest itself positively or negatively, depending on variation of the voltage and the amount of DG that can be connected to the distribution networks. This paper presents a way to estimate the voltage variation and the amount of the DG that can be accommodated into the distribution networks. To do this, a voltage rise formula is used with some approximation and the validation of this formula is checked by comparing with the existing power systems simulation software. Using the voltage variation formula, the worst case scenario of the distribution network with DG is used to estimate the amount of voltage variation and maximum permissible DG.