公开(公告)号：US10992233B2

公开(公告)日：2021-04-27

申请号：US16478916

申请日：2018-01-29

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Catalin Gabriel Dincan ,  Philip Carne Kjær

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/08

Abstract: A DC to DC power converter is described that includes a transformer, a primary side connected to a primary transformer winding, and a secondary side connected to a secondary transformer winding. The secondary side comprises inductor-capacitor (LC) circuitry at an input, and a plurality of diodes providing uncontrolled rectification. A controller controls switching of the switching circuitry to apply voltage pulses to the primary transformer winding. The voltage pulses are separated by zero-voltage periods. A switching frequency of the switching circuitry is less than the resonant frequency of the LC circuitry.

公开(公告)号：US12237687B2

公开(公告)日：2025-02-25

申请号：US17794226

申请日：2021-01-19

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Bo Sun ,  Ciprian Biris ,  Catalin Gabriel Dincan ,  Philip Carne Kjær

IPC: H02J3/38 ,  H01F29/04 ,  H02J3/00 ,  H02M1/00

Abstract: A method of operating a power generating system for a wind turbine connected to an electrical grid, the power generating system comprising a power generator, a converter, a transformer and a tap changer, the method comprising; when operating the power generating system in a grid-forming configuration, monitoring a signal for detecting a voltage of the electrical grid which requires an increase in output voltage from the power generating system in order to maintain the grid voltage within a predetermined voltage range; and operating the tap changer to tap-up the transformer to provide at least part of the voltage increase required to maintain the grid voltage within the predetermined voltage range.