Category Archives: Tools and Guidelines

Documents relevant to technical aspects of SSEG installations and application assessment.

Deterministic Hosting Capacity Analysis tool

The Deterministic Hosting Capacity Analysis tool is a DIgSILENT programming language (DPL) script that calculates the hosting capacity of a LV network through deterministic means. It computes the generation capacity that can be accommodated on each bus out of a set of selected buses (determined by the user) of a LV network without violating any voltage or thermal limits. However, it does not compute the hosting capacity of the whole network. The hosting capacity of each bus is calculated assuming that no generators are connected any else on the network. For each bus, the tool also determines where network strengthening can be applied to increase the bus hosting capacity.

November, 2021
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All municipalities
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3 KB
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Stochastic Hosting Capacity Analysis tool

The Stochastic Hosting Capacity Analysis tool is a DIgSILENT programming language (DPL) script that calculates the hosting capacity of a LV network using stochastic methods. The tool computes the generation capacity that can be accommodated by the whole LV feeder network without violating any voltage or thermal limits. Additionally, the tool provides results for a configuration that describes how this generation capacity can be distributed between a given set of buses/nodes (determined/identified by the user). The tool also provides information on where network strengthening can be applied to increase its hosting capacity. The nature of the algorithm applied is such that is closely mimics events as seen in real networks where small-scale embedded generators of random sizes are connected at random locations.

November, 2021
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All municipalities
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5 KB
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Hosting Capacity analysis tool user guide

This user guide is intended to help the reader with using the hosting capacity analysis tool for both the deterministic and stochastic method. The hosting capacity analysis tool is meant for use in LV networks to assess the amount of generation capacity that can be integrated into LV networks without compromising the power quality and reliability of the networks under existing control configurations and without requiring network strengthening. This guide covers the requirements needed/prerequisites that need to be met to use the tool, how to import the scripts of into DigSILENT project, and steps on how to use the stochastic and deterministic hosting capacity analysis methods/scripts. (CSIR, 2021)

November, 2021
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All municipalities
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1.5 MB
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SSEG Load Flow Tool Test Cases

The following test cases can be used to test the load flow assessment tool. The parameter for each network are given together with the expected results for each scenario (CSIR, 2021).

October, 2021
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All municipalities
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1 MB
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SSEG Load Flow Tool User Guide

This user guide is a reference for use of the Load Flow Assessment tool for Small Scale Embedded Generation (SSEG) into medium and low voltage networks. It is intended for small radial distribution networks with a maximum of four buses and a minimum of two buses. Its purpose is to calculate steady-state currents, bus voltages, real and reactive power flows through branches in a network. It offers insight into how a network performs in a various operating conditions. The tool also gives insight into over and under voltage situations and thermal limit violations (CSIR, 2021).

October, 2021
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All municipalities
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3 MB
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SSEG Load Flow Tool

The Load Flow Assessment tool is for Small Scale Embedded Generation (SSEG) in medium and low voltage networks. It is intended for small radial distribution networks with a maximum of four buses and a minimum of two buses. Its purpose is to calculate steady-state currents, bus voltages, real and reactive power flows through branches in a network. It offers insight into how a network performs in a various operating conditions. The tool also gives insight into over and under voltage situations and thermal limit violations (CSIR, 2021).

October, 2021
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All municipalities
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1 MB
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SSEG Guide for Municipal Distributors

This document describes how municipal distributors can adjust to a future where SSEG is a more significant part of their network. It starts by outlining the high-level institutional and operational changes that are necessary, and then moves to the practicalities of the processes, requirements, documents, and capacity needed to accommodate SSEG onto the network. It refers to documents endorsed by SALGA and the AMEU for this purpose, as well as noting the capacity building support available.

March, 2021
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All municipalities
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5 MB
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Grid Impact Study Specification (Guide)

A specification that can be given to installers/consultants which clarifies the grid impact assessments that are to be undertaken, and various approaches and parameters that are acceptable in such studies. Municipal distributors should fill in and/or customize as necessary. (SEA, 2020)

October, 2020
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All municipalities
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230kB
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Approved Photovoltaic Inverter List (NRS097-2-1, 2017 version only)

The City of Cape Town’s approved inverter list for NRS097-2-1 2017 version only (inverters with NRS097-2-1 2010 certificates, and not 2017 certificates, are not on this list). Cape Town updates this list periodically, so visit the City of Cape Town website to see the latest version (Cape Town, 8 Jan 2021).

April, 2020
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City of Cape Town Metropolitan
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1 MB
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Power systems simulations comparison

A table comparing different power system simulation software characteristics. Compiled by the CSIR (CSIR, 2019).

April, 2019
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All municipalities
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182kb
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