Development of a Web-based Co-Simulation Platform for ESS Frequency Stabilization Analysis in Renewable Energy Integrated Distribution Systems

As renewable energy penetration increases, frequency stability in distribution systems has become a major challenge. Energy Storage Systems (ESS) offer fast and effective frequency regulation, but existing co-simulation tools require programming expertise, limiting their practical use. This paper proposes a web-based co-simulation platform that enables operators to evaluate ESS frequency stabilization effects without programming knowledge. The platform integrates a HELICS-based multi-federate architecture with a swing equation-based dynamic frequency model to simulate interactions among wind turbines, ESS, and distribution networks. Case studies on an IEEE 13-bus distribution system show that ESS reduces RoCoF and frequency deviation during sudden wind power fluctuations, with frequency deviation reduced by up to 68% depending on ESS capacity. The platform supports practical decision-making for ESS capacity planning in distribution systems.