Development of power conditioning system (PCS) for battery energy storage systems

This paper presents development of 500kVA and 100kVA type utility-scaled power conditioning systems (PCSs) used in the battery energy storage system. Thanks to appropriate hardware and software design, PCSs are very efficient across a wide working range. Some important functions are equipped, such as softstart, anti-islanding, stand-alone operation and so on, with the purpose of improving stability and reliability in various challenging dynamic working conditions. To account for expanding battery storage capacities, our developed PCSs are very flexible, since several PCS modules can be connected to work in parallel. Factory tests in electrical, control and thermal aspects have demonstrated their excellent performance.