The projected demand for hydrogen as a medium of energy storage, coinciding with the search for new sources of ancillary services, has highlighted the potential for the use of large scale electrolysers for power system ancillary services. The projected increase in size and number of electrolysers warrants a good understanding of the potential effects in the power system. Tobut this end, suitable models are needed to aid studies of electrical power system dynamics with electrolysers configured as sources of ancillary services. This presentation provides an overview of the process of implementing of a practical model of a large scale electrolyser (>1 MW). The presentation also proposes a control scheme to extend the basic capabilities of large scale electrolysers to provide ancillary services to the electrical power system.
Real time simulations are performed by using the Real-Time Digital Simulator (RTDS) platform to investigate the response of the electrolyser model to external command signals and power system disturbances. The 1 MW model is also scaled to 300 MW with the view to qualitatively assess its performance, with respect to grid code compliance. The results show that the generic 1 MW model in RTDS can replicate the step response profile of a real electrolyser. The results also support the view that high level control schemes are a key enabler for ancillary services using large scale electrolysers. High level control schemes can enable an operation of the electrolyser load on the basis of market and power system conditions.
Patrick Ayivor • Tennet / TU Delft