At the South African Grid Code Industry Expert Team (IET) meeting on 13 December 2015, the long-awaited Power Quality (PQ) Guideline for Renewable Power Producers (RPPs) was finally approved.
Development started in 2013, when it became clear that the Grid Code requirements for PQ was unclear. It focuses on harmonics, but unbalance and flicker aspects were added towards the end of the development.
Key changes are the following:
NOTE: The CIGRE C4-109 method does not always give clear-cut answers.
Some concerns still remain, e.g. the enforcement of the three-times impedance rule, especially in view of the low fault levels at many installations. I do expect further developments will happen as we gain more experience.
For now, it is a massive step forward for the Renewable Energy sector in South Africa. Well done to all who participated in die working group!