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Transformers equipped with an on-load tap-changer (OLTC) are the primary voltage regulators in sub-transmission and distribution networks. As the size of variable generation grows in respect to local feeder demand, the varying bidirectional flow of active power in the feeders interferes with the operation of the OLTC transformers. Currently most grid codes require utility-scale wind and PV plants...
The inherent variability of wind power injections becomes particularly important for wind farms connected to weaker networks, as voltage deviations become more significant and voltage regulation more challenging. Through sensitivity analysis and continuation methods, this paper examines the impact of wind injection on transformer tap operation in subtransmission networks. The results of a tap operation...
The integration of inherently variable wind generation into weak grids, particularly sub-transmission networks that are characterized by low X/R ratios, affects bus voltages, regulating devices and line flows. The meshed structure of these networks adds to the complexity, especially when wind generation is distributed across multiple nodes. This paper considers a range of techniques for analyzing...
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