Patent ID: 9124134
Filing Date: 2015-09-01
Classification: F03D,F05B,G01R,G05B,H02J,Y02E

Abstract:
1. A method for avoiding voltage instability in an electrical grid of an offshore wind park, the offshore wind park electrical grid being connected at a first end of a high voltage alternating current transmission and a main land electrical grid being connected at a second end of the high voltage alternating current transmission, and the offshore wind park having a plurality of wind turbines connected to the wind park electrical grid, the method comprising: determining a main land phase angle at or near the second end of the high voltage alternating current transmission, measuring an individual wind turbine phase angle at one or more of the wind turbines, determining a difference between each of the one or more measured individual wind turbine phase angles and the main land phase angle, determining a threshold phase angle difference, and predicting voltage instability when at least one of the differences between the measured individual wind turbine phase angles and the main land phase angle exceeds the threshold phase angle difference, wherein if the difference between at least one individual wind turbine phase angle and the main land chase angle exceeds the threshold chase angle difference, the active and reactive power to be generated by each of the wind turbines is determined based on the corresponding difference between the individual wind turbine phase angle and the main land phase angle.