Management of decentralised PV-battery systems
Net parity of photovoltaic electricity with the price for domestic consumers makes on-site consumption of locally generated electricity increasingly interesting. Efficient and long-life batteries will allow storage to increase on-site consumption in future. In the ”Net-PV“ project, researchers are investigated the opportunities and benefits of different operating strategies for solar battery systems and the combination of business models.
|Project status||PRoject completed|
|Typical system size / Energy||5-10 KWh|
|Typical system size / Output||5-15 KW|
|Typical discharge time||1-8 h|
|Response time when preparing the energy||In the range of minutes|
|Typical period between storage and withdrawal||1-8h|
|Example application areas||Ancillary services and self consumption|
|Project duration||November 2012 until October 2016|
Network services and related business models in the Smart Grid will be made possible and tested via the management and communication system for distributed lithium-ion energy storages, generators and loads which is to be developed on household and network level. Through decentralized, electrical storages and a rising self-use of PV-electricity in private households, distribution and transmission networks will be relieved, the problems caused by feed-in related to power quality and equipment overload be avoided and grid expansion measures minimised.
The project is currently in the state "potential analysis, concept development". Potential studies on own consumption and its possible contribution from participating in grid services are being analysed. From these studies business models are being derived from the perspective of the different stakeholders, including statements on the feasibility of these models, both micro- and macroeconomically. Furthermore, concepts for the technical realisation of the components and the management are being developed.
Optimisation and economic viability
The integration of battery storages in distributed PV systems enables network-a relief for the network and ensures that the majority of locally generated energy can be consumed locally or can be transported at a later date. As well, active management of distribution networks is possible. Through the network services of storages, additional yield will be generated.For the operator the network services provides, depending on the business model and operation of PV battery systems, another source of income besides the improvement of self-sufficiency in the household.
Field tests with decentralized PV-battery systems
One major objective of the project "grid management of optimised, decentralised PV-battery systems on low voltage level" (short form: NET-PV) is to create the basis for a transparent energy and cost efficient as well as safe and reliable operation of decentral PV-battery systems to enable a contribution to a sustainable, economical and environmentally friendly energy supply both from the perspective of the grid and the owners of the PV systems. In this context active distribution grids will have to provide not only monitoring of all components connected to the distribution grid, but also local regulation possibilities. In a field test in the supply area of the Stadtwerke Schwäbisch Hall the connection of the decentral PV-battery systems for grid service purposes shall be put to the test.
The major objective is therefore to enable a sustainable, economical and environmentally friendly energy supply both from the perspective of the grid and the owners of the PV systems based on a transparent energy and cost efficient as well as safe and reliable operation of decentral PV-battery systems. The targeted system is intended to be used in single family houses and small businesses withing the low voltage grid.
- Creation of a business model after potential assessment and simulation
Presentation of a trend-setting business model for the operation of a PV storage system with ancillary services
- Communication component
Identifying a functional, practicable solution of communication between the components via the platform field bus
- Communication in the building and in the electrical distribution grid
Presentation of a functional, practicable communication including control options within the building and the electrical distribution grid.
- Operational management for distribution network and building
EMS for PV storage systems, presentation of serviceable software and hardware solution for operation in buildings and distribution network
- Feedback system
Presentation of serviceable feedback system for the pv- storage system
- Battery and Battery management system
Application of serviceable close-to-production prototype battery storage and battery management system by using in test laboratory and filed test operation
- Installation test system
Successfully realized laboratory test with all necessary components for the complete system
- Field test
Realized and evaluated operation filed test for development of ancillary services in the supply area by Stadtwerke Schwäbisch Hall