Sub-Millisecond Transient Analysis with Multi-Point Measurement in Weak Grids

Abstract

Peak loads determine the rated capacity of islanded grid power supplies. This often results in non-optimal running conditions in terms of cost, efficiency or size footprint. Presented in this paper is a method of in-depth analysis of very fast sub-millisecond transient behaviour performed between sub-systems and supply in a low-inertia grids. Using this method, time domain measurements can be analysed to potentially achieve electromagnetic compatibility. Synchronised current and voltage measurements are possible, with offsets in the sub-milliseconds and high sample rates of tens of Mega-samples per second. A demonstration of a weak grid is presented showing effects of linear and non-linear loads on the supply source and power quality.