Real-time control of utility-scale storage on a distribution feeder

A Smart Grid demonstration project is currently underway at Public Service Company of New Mexico (PNM). This project is designed to combine a battery storage system with a photovataic (PV) system to smooth out the cloud induced intermittency of PV output. The whole system is already in use and the smoothing algorithm successfully smoothes the PV output as designed. This paper introduces the structure of the system, and discusses how to design the smoothing algorithm in five aspects, including choosing the smoothing reference as well as choosing the window size of smoothing algorithm. Specifically this paper puts forward a new method to recover the state of charge (SoC) of the battery while performing intermittency mitigation.