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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Integration of voltage dependent power injections of distributed generators into the power flow by using a damped Newton method
 International journal of electrical power & energy systems 99 (2018), S.695705 ISSN: 01420615 

 Englisch 
 Zeitschriftenaufsatz 
 Fraunhofer IEE () 
Abstract
Voltage dependent active and reactive power injections are used to improve the grid integration of distributed generators, such as photovoltaic systems. In stateoftheart literature these power injections are considered during power flow calculations via an external loop, which requires to perform multiple (up to ten or more) power flow calculations in order to obtain one static operation point. In this paper it is shown how to integrate voltage dependent power injections into the nonlinear grid equations in order to solve for a static working point by means of performing one Newton power flow calculation. That makes the external loop unnecessary and save computational time. Furthermore, it is shown for a twobus system that the integration of voltage dependent power injections into the nonlinear grid equations can exhibit illconditioned power mismatch functions. Therefore, a damped Newton method is used in order to avoid numerical oscillations. Simulations of the IEEE 118bus test system and a real German 234bus test system show that the damped method converges faster and is computationally more efficient than the external approach currently used in literature and stateoftheart simulation tools in power systems. In addition, the implemented power flow algorithm is validated in the laboratory for a twobus system and a numerical example of a lowvoltage feeder is given.