Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Dispatch of reactive power compensators in transmission grids
:
Knittel, M.; Massmann, J.; Schmitt, C.; Kamenschikow, D.  Electric power systems research 180 (2020), Art. 106126 ISSN: 03787796 

 Englisch 
 Zeitschriftenaufsatz 
 Fraunhofer FIT () 
Abstract
The phaseout of conventional power plants reduces the reactive power reserve from synchronous generators in transmission grids. Operational concepts need to be adapted to integrate reactive power compensators such as STATCOMs into voltage control schemes. This paper presents a novel twostage optimization method for determining reactive power schedules, distinguishing manual and automatized control variables. The first stage optimizes the reactive power dispatch iteratively for the considered period using successive linear programming based on continuous variables due to relaxed integrality conditions. Afterwards, an embedded genetic algorithm rediscretizes integer variables. The second stage determines paretooptimal reactive power schedules based on grid losses and switching frequency. Therefore, points of time are modeled as nodes and loss energies between two timecoupled points of time are modeled as arcs in a directed acyclic graph. The investigated scenario indicates that a high number of switching actions for passive compensators, such as shunt capacitors or reactors, is not necessary. Furthermore, it becomes apparent that the automated control of flexible devices like STATCOMs enables a reduction of active power losses.