Development of tools for simulation systems in a distribution network and validated by measurements

The increasing amount of DER components into distribution networks involves the development of accurate simulation models that take into account an increasing number of factors that influence the output power from the DG systems. This paper presents two simulation models: a PV panel model using the single-diode four-parameter model based on data sheet values and a VRB system model based on the efficiency of different components and the power losses. The models were implemented first in MATLAB/Simulink and the results have been compared with the data sheet values and with the characteristics of the units. Moreover to point out the strong dependency on ambient conditions and its influence on array operation and to validate simulation results with measured data a complex model has also been developed. A PV inverter model and a VRB inverter model, using the same equations and parameters as in MATLAB/Simulink, has also been developed and implemented in Power Factory to study load flow, steady-state voltage stability and dynamic behavior of a distribution power system.