In this set-up the storage ties into the system behind the existing PV inverter and combines in parallel with existing PV strings at a recombiner. Of the previous outlined revenue streams available to PV with energy storage, the DC-coupled approach allows for revenues to be derived from all value streams — guaranteeing maximum value from an installed PV array.
Not all revenue streams are available to AC-coupled or Hybrid inverter solutions. Secondly, by adding energy storage on the DC PV bus, costs associated with adding energy storage can be greatly reduced. For developers familiar with the interconnection study process in many jurisdictions, there is a great benefit of not getting caught in a long interconnection review queue or tying up internal or external engineering resources to guide systems through the process.
Likewise, depending on the off-taker, there may be no need to alter an existing PPA. A chief concern with energy storage design for utility-scale PV integration is optimizing for highest efficiency. As illustrated below, the efficiency achieved via a DC-coupled storage system is greater than for AC-coupled.
This stems from the avoidance of funneling power through two MV transformers in the charging process as is required by AC systems. The net is 3 power electronic conversions and one transformer conversion in the round trip. Figure 8 This figure illustrates an AC-coupled system where the charge cycle 1 has two DC-AC conversions and two transformer conversions and the discharge cycle 2 has a single DC-AC conversion and one transformer conversion.
The net is 3 power electronic conversions and three transformer conversions in the round trip netting a total efficiency of The ability for a storage system to qualify for the federal PV investment tax credit ITC is based on the percentage of the battery charging energy that comes from the PV array.
With a DC-coupled design, the storage system can only be charged from the PV array so there is zero risk of ITC claw back and tax credits are made available to the owner.
Furthermore, you eliminate the additional metering and controls needed with AC-coupled storage to verify that the batteries are charged from PV energy, further reducing CAPEX. Conclusion Dynapower recognizes that each PV installation has its own set of circumstances and considerations. Its ease and reduced cost of installation combined with its ability to bring online all additional value streams make it particularly attractive for the over 20 GW of installed utility-scale PV.
Chris Larsen Senior Sales Engineer [email protected] 1 Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Bourns Web Survey Please answer as many questions as you can with 1 being unfavorable and 5 most favorable.
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Femtogrid DC cables have 3 wires: hot red , cold blue and safety black , whilst standard solar DC cables used by traditional solar have 2 wires: plus red and minus blue. The extra third wire gives Femtogrid the edge to control every single module in the system, as the hot wire is switched off by the safety wire.
This makes Femtogrid the safest system. Share this page. Subscribe here.
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