Optimizing the power quality of the MV distribution network in fault condition based on D-STATCOM in accordance with the Moroccan Grid Code requirements

Abstract

In this work, we present a novel method concerning a D-STATCOM integration to the Moroccan electrical distribution network, which is not yet adopted by national DSO’s (Distribution system Operator), the device is implemented at the PCC (Point of common Coupling) of a grid connected PV power plant, which is a typical case of the increasing penetration of renewable generators in the national electrical network. The device is proposed to compensate for voltage fluctuation and the dynamic support of grid voltage in the event of disturbances or the failure of renewable generators especially in context of the increasing integration of these sources. The control strategy is tuned to achieve performance constraints imposed by the national Grid Code. The proposed system overcomes network uncertainties and grid disturbances and significantly improves the power quality at the point of common connection PCC while absorbing and providing reactive power to the network in an acceptable reversing time due to voltage sags and swells and mitigating voltage flicker. The considered D-STATCOM (Distribution Static Compensator) was able to ride through grid faults in most cases which is necessary to achieve LVRT (Low voltage Ride through) and dynamic voltage support requirements. The results of the simulation are compared to the technical requirements according to the Moroccan Grid code and show good results in simulation while respecting the technical limits imposed by local regulations.