Bat­ter­ies re­duce power grid dis­rup­tions

DEMM Engineering & Manufacturing - - ELECTRICAL TECHNOLOGY -

Re­searchers from North Carolina State Univer­sity and Johns Hop­kins Univer­sity have found that an in­crease in the use of wind power gen­er­a­tion can make the power grid more frag­ile and sus­cep­ti­ble to dis­rup­tions.

Typ­i­cally, the power flow­ing through the trans­mis­sion lines of a power grid suf­fers from small “os­cil­la­tions,” or de­vi­a­tions from the norm, af­ter a dis­tur­bance. Gen­er­ally, th­ese os­cil­la­tions are mit­i­gated by means of con­trollers in­side the power gen­er­a­tors.

How­ever, if the con­trols are not strong enough, the os­cil­la­tions may be “sus­tained,” re­duc­ing the ef­fi­ciency of power trans­fer and pos­ing a threat to the sta­bil­ity of the grid.

The re­searchers found that, un­der cer­tain cir­cum­stances, wind power gen­er­a­tors can make th­ese os­cil­la­tions worse. This is be­cause wind farms pro­duce power er­rat­i­cally.

“To coun­ter­act this prob­lem, we have de­signed a tech­nique that co­or­di­nates the ac­tiv­ity of con­trollers in­side the wind tur­bines and bat­tery man­age­ment sys­tems to even out the flow of power from wind farms into the grid,” says Dr Aranya Chakrabortty, an as­sis­tant pro­fes­sor of elec­tri­cal engineering at NC State.

Specif­i­cally, the team de­vel­oped sev­eral al­go­rithms that match con­trol ef­forts be­tween wind farms and en­ergy stor­age fa­cil­i­ties. If the power out­put for the wind farm in­creases, the sur­plus can be si­phoned off to charge bat­ter­ies at the stor­age fa­cil­ity, in­stead of be­ing dumped di­rectly onto the power grid.

Newspapers in English

Newspapers from New Zealand

© PressReader. All rights reserved.