Study on Cascaded STATCOM with Energy Storage Applied for Impulse Power Compensation

Megawatt power impact frequently occurs during operation of industrial devices, which shows the features of high amplitude and strong randomness. Cascaded static synchronous compensator with battery energy storage system (STATCOMBESS) is a promising approach to solve the power impact problem. Cascaded STATCOM-BESS has advantages of large single-machine capacity and rapid response, however, which is not yet mature for industrial application. Aiming at this issue, study on cascaded STATCOM-BESS is conducted in this paper, comprising the parameters calculation and selection for cascaded static synchronous compensator (STATCOM), boundary capacity analysis and battery module number determination for battery energy storage system (BESS). Finally, the simulation results based on PSCAD/EMTDC validate effectiveness and correctness of the analysis and design for crucial parameters of STATCOMBESS, which can provide high-amplitude impulse active (1.5MW) and reactive power (2MVar) simultaneously after operation of STATCOM-BESS at 0.5s.