Modelling of Supercapacitor Banks for Power System Dynamics Studies

The paper presents accurate and simple dynamic model of a supercapacitor bank system for power system dynamics studies. The proposed model is derived from a detailed RC circuit representation. Furthermore, a complete control system of the supercapacitor bank is also presented. The proposed model is easy to integrate in any power system simulation software and consists of only up to four standard datasheet parameters. The performance of the proposed model in grid frequency control and low-voltage ride through is illustrated on IEEE 14-bus test system in DIgSILENT PowerFactory. It is shown that in case of transient stability simulations the ideal (simplified) model of the supercapacitor can be used while in case of frequency control the ideal representation may not always be appropriate.

Automated summary

The paper proposes an accurate and simple dynamic model of a supercapacitor bank system derived from a detailed RC circuit representation, including a complete control system. The model is easy to integrate into any power system simulation software and has been demonstrated in grid frequency control and low-voltage ride through scenarios on an IEEE 14-bus test system in DIgSILENT PowerFactory. The study shows that while the ideal (simplified) model of the supercapacitor can be used in transient stability simulations, it may not always be appropriate for frequency control.