公开(公告)号：US11742667B2

公开(公告)日：2023-08-29

申请号：US17052710

申请日：2019-04-26

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Lennart Petersen

IPC: H02J3/38 ,  H02J3/32

CPC classification number: H02J3/381 ,  H02J3/32 ,  H02J2203/20 ,  H02J2300/10 ,  H02J2300/24 ,  H02J2300/28

Abstract: The present invention relates to a hybrid power plant comprising a plurality of power units being operatively connected to an internal power grid, wherein the power ratings of the plurality of power units of the hybrid power plant are determined in accordance with active and reactive power losses in the internal power grid in order to obtain optimal and cost efficient operation of the hybrid power plant. The present invention also relates to a method for determining the power ratings of a plurality of power units being operatively connected to an internal power grid of such a hybrid power plant.

公开(公告)号：US12261439B1

公开(公告)日：2025-03-25

申请号：US18797430

申请日：2024-08-07

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Lennart Petersen ,  Torsten Lund

IPC: H02J3/24 ,  H02J3/38

Abstract: A method for damping power oscillation in an electric power grid, comprising: performing a procedure for determination of a phase shift between a filtered voltage signal and a filtered frequency signal; based on the performed procedure, determining which one of the filtered voltage signal and filtered frequency signal is leading or lagging in relation to the other one of the filtered voltage signal and filtered frequency signal; based on the determination of which one of the filtered voltage signal and filtered frequency signal is leading or lagging, setting a gain of a power oscillation damping controller to be positive or negative; applying the power oscillation damping controller with the set gain so as to produce an output signal outputted from the power oscillation damping controller; and based on the produced output signal, controlling an injection of electric power to the grid so as to dampen power oscillation in the grid.

公开(公告)号：US11990755B2

公开(公告)日：2024-05-21

申请号：US18305055

申请日：2023-04-21

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Per Hagen Nielsen ,  Lennart Petersen ,  Germán Claudio Tarnowski

IPC: H02J3/24 ,  G01R19/04 ,  G01R19/10

CPC classification number: H02J3/241 ,  G01R19/04 ,  G01R19/10

Abstract: A method for detecting power oscillation in an electric power grid, wherein the method comprises: integrating a filtered signal on a first interval, the filtered signal being associated with the electric power grid; based on the integration of the filtered signal on the first interval, determining a positive half-period area of the filtered signal and a negative half-period area of the filtered signal, one of the positive half-period area and negative half-period area being immediately subsequent to the other one; and determining that a power oscillation in the electric power grid is detected if the following two conditions are met:



a sum of the positive half-period area of the filtered signal and the negative half-period area of the filtered signal is below a first threshold; and
the absolute value of one of the positive half-period area and negative half-period area is above a second threshold.