The CSIR partnered with several South African municipalities to assist in the assessment of the technical grid impacts of Small Scale Embedded Generation (SSEG) on distribution networks as the market grows. From a gap analysis using different metrics on the municipalities, it was identified that customised support would be required in various areas to fill the gaps in in terms of technical grid impacts to ensure it can be performed. The metric from the gap analysis that is the focus of this work is the availability and application of tools (software applications primarily) that are appropriate for assessment of SSEG integration; some of the municipalities showed a lack in accessing these tools and/or the skills to use them. A simplified load flow tool assessment tool developed on Microsoft Excel is therefore developed by the CSIR which forms part of the customised support offered the municipalities in terms of the metric described. Microsoft Excel is widely accessible and has a relative minimal learning curve. Its intended use is performing simple three phase balanced load flow assessments on radial distribution power networks to determine the steady state operating conditions with a given loading and/or be used to determine the effect on load flow of the addition of SSEG to down-stream power networks. For the municipal networks, the highly complex power systems can be reduced to their aggregated equivalent networks which then the load flow for these networks can then be computed by the load flow tool to determine effects of SSEG added at specific points in a network. Due to the limitations of Excel as a computation platform/engine for increasing larger aggregated networks, for further development of the load flow tool, alternative platforms must be considered.
SSEG Grid Impact Assessments Support for Municipalities: Simplified Load Flow Assessment Tool