Vestas Wind Systems A/s

Bo Sun

Ciprian Biris

Torsten Lund

Philip Carne Kjær

Catalin Gabriel Dincan

Philip Came Kjær

Sönke Engelken

A method for controlling a power output of a grid forming wind turbine () in order to dampen power oscillations between a power grid () to which the wind turbine () is connected and the wind turbine () is disclosed. A damping power reference, P, depending on a grid frequency of the power grid () and/or on a virtual rotor speed is calculated, with the purpose of dampening oscillations in the power output of the grid side converter (). A power output of the grid side converter () is controlled, in accordance with a grid side power reference, P, and taking the damping power reference, P, into account. A feedforward power reference for the machine side converter () is generated, the feedforward power reference including the damping power reference, P, and an inertia power reference, P, proportional to the time derivative of the grid frequency, and a power output of the machine side converter () is controlled at least partly based on the feedforward power reference.

Method for controlling a power output of a grid forming wind turbine

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; monitoring a signal for detecting an over-voltage condition in the electrical grid which requires a reduction in the output voltage from the power generating system; initiating a convertor response mode configured to provide at least part of the required voltage reduction; and initiating a transformer response mode configured to provide at least part of the required voltage reduction; wherein the transformer response mode comprises operating the tap changer to adjust the output voltage from the power generating system.

Wind turbine power generation comprising an ac-dc-ac converter and a transformer with a tap changer

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.

Wind turbine power generation comprising an AC-DC-AC converter and a transformer with a tap changer

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; monitoring a signal for detecting a voltage in the electrical grid which requires an increase in output voltage from the power generating system; determining a partial-load condition of the converter, which corresponds to the converter being configured to output a voltage which is substantially below its maximum output voltage; and upon determining the partial-load condition, operating the tap changer to tap down the transformer, and operating the converter to provide the required increase in output voltage from the power generating system.

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Aarhus N, Denmark

Bo Sun