Siemens tech­nol­ogy for greater grid sta­bil­ity

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ith Spec­trum Power Ac­tive Net­work Man­age­ment (ANM), Siemens is in­tro­duc­ing a new grid con­trol-sys­tem tool that was de­vel­oped to en­able sta­ble grid op­er­a­tion with the in­creas­ing in­te­gra­tion of re­new­able en­ergy sources. Us­ing this con­trol sys­tem as a cen­tral con­trol and regulation sys­tem, volt­age range de­vi­a­tions can be avoided and over­load sit­u­a­tions and fluc­tu­at­ing di­rec­tion-of-load flow can be man­aged. This is achieved not only by con­trol­ling volt­age, re­ac­tive power, and grid ca­pac­ity uti­liza­tion but also through im­proved visu­al­iza­tion of th­ese grid pa­ram­e­ters. In this way, Spec­trum Power ANM en­ables ac­tive grid man­age­ment through the au­to­matic op­ti­miza­tion of grid con­trol.

In or­der to im­ple­ment ac­tive grid man­age­ment, Spec­trum Power ANM works on the ba­sis of a con­di­tion eval­u­a­tion process and on­line op­ti­miza­tion with no user in­ter­ven­tion re­quired. It is equipped for this pur­pose with a cen­tral open- and closed-loop con­trol sys­tem with lo­cal in­tel­li­gence, which in con­junc­tion with the

Wsys­tem’s hi­er­ar­chi­cal ar­chi­tec­ture in­creases fail­ure safety. The con­di­tion as­sess­ment pro­ce­dure eval­u­ates power, re­ac­tive power, cur­rent, and volt­age, en­abling prob­lems to be iden­ti­fied gener­i­cally. Thanks to au­to­matic on­line op­ti­miza­tion with­out op­er­a­tor in­ter­ven­tion, it is pos­si­ble to re­duce losses, volt­age range de­vi­a­tions, over­loads, the ref­er­ence power, and op­er­at­ing costs. Over­all, grid oper­a­tors can re­solve com­plex grid and load­ing prob­lems with the Siemens con­trol tech­nol­ogy tool, uti­lize ca­pac­ity re­serves more ef­fec­tively through ac­tive grid man­age­ment, and op­er­ate con­trol­lable equip­ment to greater ad­van­tage.

Siemens has al­ready put this grid con­trol tech­nol­ogy into op­er­a­tion for Bri­tish grid op­er­a­tor North­ern Power Grid. The util­ity’s in­creas­ing in­te­gra­tion of re­new­able en­ergy sources had stretched the grid’s ca­pac­ity to its lim­its, caused volt­age range de­vi­a­tions, and over­loaded the pri­mary equip­ment. North­ern Power Grid calls its grid op­ti­miza­tion pro­ject the Grand Uni­fied Scheme, which is part of the lead­ing UK smart grid pro­ject Cus­tomer-Led Net­work Rev­o­lu­tion. The in­te­grated hi­er­ar­chi­cal con­trol tech­nol­ogy so­lu­tion for ac­tive grid man­age­ment—de­vel­oped by Siemens jointly with the grid op­er­a­tor—con­sists of a cen­tral con­trol sys­tem, a cen­tral data­base, and 15 au­ton­o­mous sub­sta­tion con­trollers and uses a wide-area com­mu­ni­ca­tion sys­tem. The pro­ject also com­prises seven bat­tery stor­age sys­tems, two in-phase boost­ers, and six ad­justable trans­form­ers for volt­age and load con­trol. Ten load-shed­ding con­tracts have been con­cluded for this grid. The so­lu­tion also con­sid­ers real-time loads in a closed-loop con­trol cir­cuit for op­ti­mal con­trol of the grid.

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