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In this paper, the impact of residential distributed energy resources (DER) on the power quality is investigated in four feeder types of the electrical LV distribution network in Flanders, Belgium. The investigated power quality issues are over-voltage, under-voltage and unbalance. The results of the simulations are discussed in detail. The paper leads to an estimation of the compliance to the power quality standard EN 50160, and a summary of issues in the distribution grids when increasing the amount of DER.

T. Wijnhoven has a Ph. D. fellowship of the Research Foundation -Flanders (FWO) and wishes to acknowledge the financial support of the FWO.

This paper describes a control scheme to flexibly control the positive and negative sequence fault current contribution of inverter interfaced distributed generation (IIDG). This flexible control can be beneficial to limit the impact of distributed generation (DG) on existing grids. This way, a large scale integration of DG becomes possible in existing grids. A double synchronous reference frame (DSRF) control strategy is chosen. The phase locked loop (PLL) and current controller are based on available techniques and are described briefly. The performance of the control system is illustrated in a PSCAD simulation environment. Both symmetrical and asymmetrical faults are applied on a generic European medium voltage grid. Only the setpoints during faults have to be changed to obtain a specific fault response, creating the required flexibility. Index Terms-distributed power generation, fault currents, inverter, power system protection T. Wijnhoven has a Ph. D. fellowship of the Research Foundation -Flanders (FWO) and wishes to acknowledge the financial support of the FWO.