Abstract:
A method for islanding detection in an electrical power grid (18) supplied by an electrical power source (12) comprises: measuring an output voltage ( V pcc ) and a grid current ( I g ) at an interconnection point (16) of the power source (12) with the power grid (18); estimating at least one grid parameter from the output voltage ( V pcc ) and the grid current ( I g ) based on optimizing a cost function, which minimizes a difference between the measured output voltage( V pcc ) and an estimated output voltage or a difference between the measured grid current ( I g ) and an estimated grid current, which estimated output voltage or estimated output current is a function of the measured grid current ( I g ) or the measured output voltage ( V pcc ) and the least one estimated grid parameter; and detecting an islanding condition by detecting a jump (32) and/or a deviation (34) in the at least one estimated grid parameter.
Abstract:
A hybrid power system (1 ) is disclosed. The system comprises a plurality of dispatchable power resources (7.i; 7.j) and a first controller (12) for controlling the dispatchable power resources. The system further comprises a power resource section (5) responsive to environment conditions and a second controller (17) for controlling the power resource* section (5) responsive to environment conditions. The second controller (17) is configured and arranged for measuring a total power (∑P genset ) generated by the plurality of dispatchable power resources (7.i; 7,j) and a total power (∑P PV ) generated by the power resource section (5) responsive to environment conditions; and for generating a power curtailment signal (PV curtailment ), when required, for reducing the total power (ΣΡ PV ) generated by the power resource section (5) responsive to environment conditions.
Abstract:
DC/AC converter comprising a new control device and method for managing inrush current transients during operation without requiring additional external devices or emergency operating modes forcing the DC/AC converter to shut down. The present invention is particularly, but not exclusively, aimed at grid connected DC/AC converters, often subject to inrush current phenomena due to perturbations in the grid.