Smart Energy Technologies & Energy Storage
Aim/Objective: Co-locate PV and energy storage inverters on a single platform through low voltage AC coupling to provide optimized capital cost while maintaining the benefits of traditional DC and AC coupled solutions.
Methods: Multiple PV and storage inverters will be installed on the same platform. By electrically connecting multiple inverters to the same low voltage winding of the MV transformer, the benefits of DC and AC coupled storage are realized. Like DC to DC conversion, this solution allows charging from the array. It also allows for charging from the grid like a traditionally AC coupled system. Skid-level management of these storage options can provide even more flexibility.
Results: Preliminary efficiency estimates confirm this method will allow for the features of DC and AC coupled storage systems. Furthermore, the ability to co-locate storage and PV inverters means more options for installation.
Conclusion: The new low voltage AC coupled storage system will provide users a cost-effective and flexible system, without sacrificing efficiency.