Grid-Connected Test Requirements and Case Analysis of Grid-Forming Energy Storage Systems

This paper presents a comprehensive analysis of grid-connected test requirements and case studies for grid-forming energy storage systems. Using a field test example, it details testing methods for frequency adaptability, voltage adaptability, power quality adaptability, low and high voltage ride through, and charge-discharge performance including response, regulation, and conversion times. The study emphasizes that on-site testing can thoroughly evaluate the frequency and voltage regulation capabilities of energy storage systems and their active support to the power grid. Results from these tests provide essential data for assessing grid-connected performance. The paper references national standards such as GB/T 36547-2018 and GB/T 36548-2018 for electrochemical energy storage systems, noting that specific standards for grid-forming systems are still under development. The findings support the integration of energy storage in new power systems, addressing challenges from renewable energy variability and enhancing grid stability.