Testing Procedures of Active Power Functions for Grid Code Compliance of Battery Systems

Abstract

The paper proposes replicable testing procedures to verify active power functions for Grid Code compliance of battery systems. The investigated control functions are frequency response, absolute power constraint, and ramp rate constraint. The considered requirements are specified in the Danish Grid Code for battery systems with rated grid connection below 125 kW. With the designed procedures, battery systems can be characterized thoroughly, fully examining the three required success criteria: accuracy, sensitivity, and response time. The testing procedures are experimentally applied to a 33.5 kW / 95 kWh reconfigurable battery storage system. The testbed was built at PowerLabDK at DTU. Results from the testing campaign showed that the battery storage operates under the specified control functions, meeting accuracy, sensitivity, and response time requirements.