Picture: LEW / Timian Hopf

Pho­to­voltaics and hydropow­er coop­er­ate for emer­gency power

LINDA 2.0 inves­ti­gates the pos­si­bil­i­ties of using green elec­tric­i­ty, for exam­ple from solar ener­gy, in the emer­gency pow­er sup­ply in the event of a black­out. Anoth­er aim of the over­all project is to make renew­able ener­gy sys­tems, such as pho­to­voltaics or hydropow­er, usable for emer­gency pow­er sup­ply. The tech­nolo­gies devel­oped in the first LINDA project are to func­tion large­ly autonomous­ly by means of appro­pri­ate software.

LINDA 2.0 is divid­ed into two sub-projects that are being imple­ment­ed in par­al­lel and in sev­er­al field tests:

1. Devel­op­ment of a new emer­gency pow­er unit

It is intend­ed to sup­ply a local grid with elec­tric­i­ty in the event of a pow­er black­out in such a way that exist­ing renew­able ener­gy pow­er gen­er­a­tion plants con­tin­ue to feed elec­tric­i­ty into the local grid. Up to now, emer­gency pow­er gen­er­a­tors have been oper­at­ed in such a way that such plants shut down temporarily.

With the new approach, the plants could help meet elec­tric­i­ty demand in the event of a pow­er out­age. In the project, the diesel genset is also to be equipped with a bat­tery that can store sur­plus elec­tric­i­ty and release it when need­ed. This means that less diesel has to be used, or a hybrid unit can be oper­at­ed for longer with the same diesel supply.

2. Auto­mat­ed emer­gency pow­er sup­ply in stand-alone operation

In the sec­ond project strand, the approach­es to emer­gency pow­er sup­ply devel­oped in the first LINDA project will be con­tin­ued. In the field tests planned for LINDA 2.0, ODK’s Leipheim hydropow­er plant will sup­ply the pumps of the Nieder­stotzin­gen pump­ing sta­tion with elec­tric­i­ty in iso­lat­ed grid operation.

This emer­gency pow­er oper­a­tion should run as auto­mat­i­cal­ly as pos­si­ble and with­out addi­tion­al per­son­nel. To this end, the project part­ners are devel­op­ing the nec­es­sary pro­grams and rou­tines, which will then be test­ed in sev­er­al field trials.

LINDA taps renew­ables for emer­gency pow­er supply

Up to now, regen­er­a­tive ener­gies have not been avail­able for the emer­gency pow­er sup­ply. The sys­tems switch off in the event of a pow­er fail­ure or when an emer­gency gen­er­a­tor is used, as they only feed in ener­gy with­in cer­tain fre­quen­cy bands in the pow­er grid.

Up to now, emer­gency pow­er gen­er­a­tors have delib­er­ate­ly been oper­at­ed out­side these fre­quen­cy bands. The LINDA 2.0 project(Local island grid sup­ply and accel­er­at­ed grid recon­struc­tion with decen­tralised gen­er­a­tion plants in the event of large-scale pow­er fail­ures) is inves­ti­gat­ing how these plants can nev­er­the­less be used to cov­er the pow­er demand in the event of a pow­er failure.

The Fed­er­al Min­istry of Eco­nom­ics and Tech­nol­o­gy is fund­ing the research project as part of the Ener­gy Sys­tems Research pro­gramme. LINDA 2.0 runs from 2021 to ear­ly 2024 and includes sev­er­al field tests in the sub­pro­jects. In the first sub-project, the project part­ners want to gath­er expe­ri­ence in the oper­a­tion of diesel gensets with bat­tery stor­age sys­tems, which are fed by PV sys­tems in the local grid, for exam­ple. With such emer­gency pow­er oper­a­tion, less diesel would be con­sumed, and the CO2 bal­ance would improve accord­ing­ly. Also, such a hybrid unit could pos­si­bly sup­ply more house­holds than a con­ven­tion­al one.
In the sec­ond sub­pro­ject, the require­ments for the sup­ply­ing exec­u­tive pow­er plant in the auto­mat­ed emer­gency pow­er sup­ply are to be worked out. This would allow the emer­gency pow­er sup­ply to be start­ed remote­ly with­out the need for staff to be on site.

Suc­cess­ful island­ing tri­als in the first LINDA project

LINDA 2.0 uses find­ings from the pre­vi­ous project, which ran from 2015 to 2018. In sev­er­al field tests, a sta­ble island grid oper­a­tion with renew­able ener­gies was suc­cess­ful­ly estab­lished. In the field tests, the stand-alone grid com­prised indi­vid­ual large con­sumers, but there were also suc­cess­ful field tests cov­er­ing sev­er­al local­i­ties with more than 1,000 house­holds as well as a large num­ber of gen­er­a­tion plants. The LINDA project was award­ed the ISGAN Award (Inter­na­tion­al Smart Grid Action Net­work) and the Bavar­i­an Ener­gy Prize.

In addi­tion to the Augs­burg Uni­ver­si­ty of Applied Sci­ences, the Tech­ni­cal Uni­ver­si­ty of Munich, LEW Verteil­netz, LEW Wasserkraft and Obere Donau Kraftwerke AG, the fol­low­ing project part­ners are involved in the LINDA 2.0 project:

  • State Water Sup­ply Stuttgart
  • KIMA Automa­tisierung, com­pa­ny for elec­tron­ic con­trol engi­neer­ing and con­struc­tion mbH
  • AVS Aggre­gate Con­struc­tion GmbH
  • Uni­ver­si­ty Hos­pi­tal Leipzig AöR
  • MTU Onside Ener­gy GmbH
  • Pow­er elec­tron­ics cluster

Infor­ma­tion on the LINDA project is avail­able at: www.lew.de/ueber-lew/zukunftsprojekte/linda-20.