Patent ID: 9252601
Filing Date: 2016-02-02
CPC Classification: H02J,Y02E

Claim Text:
1. A method of controlling a power converter for a wind turbine generator, the power converter including a direct current (DC) link having a DC link voltage, the power converter operatively coupled with a power grid at a connection point, the method comprising: determining an alternating current (AC) line voltage at the connection point; determining an estimated grid frequency value of the power grid based on the determined AC line voltage; dynamically adapting the determined AC line voltage to the estimated grid frequency value; generating, using a feedback controller, an active power reference based on a difference between a first result of a function obtained using the DC link voltage, and a second result of the function obtained using a reference DC voltage; generating a current reference signal based on at least the adapted AC line voltage and the active power reference; and determining, without performing a coordinate transformation, and based on the grid frequency value and an error signal representing a difference between the current reference signal and a measured AC current at the connection point, a converter control signal for controlling the power converter to generate power at the frequency of the power grid.