Background Stationary energy storage systems are key to renewable integration and distributed energy resources in that they provide ramp rate control, voltage and frequency support along with peak shaving and multiple ancillary services. As these systems become more prolific, industry is rapidly moving towards containerized energy storage systems which have multiple economic advantages such as lower installation cost, less time from installation to operation, and can be used at multiple sites to optimize overall system use. The containerized units come in typical shipping containers and provide for high density energy storage and power conversion designs. Due to the strict form factor and weight limitations of such designs, 2 the energy storage technology as well as the power conversion system must have low footprint and weight requirements. Traditional energy storage systems use a double conversion system with a DC-DC front end followed by a DC-AC inverter tied to a 60 Hz transformer for increasing the output voltage and galvanic isolation. A new power conversion design has become very attractive to containerized units. It consists of a high frequency transformer link conversion that eliminates the use of the bulky 60 Hz transformer and has significant size and weight reduction. There have been a number of studies done using this design for solid state transformers but little in regards to containerized energy storage systems. The new design will require substantial improvement in transformer cores to keep the electrical losses low at high frequency and temperature. In parallel with this effort and not part of this contract, Sandia will development a new magnetic core material optimized for the high frequency converter approach.
|Effective start/end date||7/23/13 → 12/31/15|
- Sandia National Laboratories (SNL): $60,614.00
High frequency transformers