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US 12,110,866 B2Granted
Method for operating a wind turbine and wind turbine
AssigneesNordex Energy GmbH, Ingenieurbuero Hoffmann GmbH
InventorsChristian Wessels, Nils Hoffmann
Life of this patent
Estimating the term…
Abstract
This disclosure is directed to a method for operating a wind turbine which includes a speed-variable drive system. The system includes an electrical machine and a pulsewidth modulation-controlled converter. The speed-variable drive system is connected to an electrical grid. In the event of a transient grid fault, a frequency of the pulsewidth modulation is determined in response to a current in an electrical circuit connected to the converter.
Claims17
A method for operating a wind turbine in association with an electrical grid, the wind turbine including:
- a speed-variable drive system connectable to said electrical grid;
- said speed-variable drive system including a generator having a rotor and a pulsewidth modulation-controlled converter including a rotor-side inverter connected to said rotor;
- a grid-side inverter connected to the electrical grid;
- and, a DC link connecting said rotor-side inverter to said grid-side inverter;
- a first electrical circuit, said first circuit connecting said generator to said pulsewidth modulation-controlled converter;
- and, a second electrical circuit, said second circuit connecting said pulsewidth modulation-controlled converter to said electrical grid;
- the method comprising:
- in an event of a transient grid fault in the electrical grid, measuring current in at least one of said first electrical circuit and said second electrical circuit;
- detecting a current increase in at least one of said first and said second electrical circuits on a basis of the current measured in at least one of said first electrical circuit and said second electrical circuit, wherein the current increase results from the transient grid fault;
- and,
- determining a frequency of a pulsewidth modulation in response to said current increase in at least one of said first electrical circuit and said second electrical circuit.
8 more elements
A method for operating a wind turbine in association with an electrical grid, the wind turbine including:
- a speed-variable drive system connectable to said electrical grid;
- said speed-variable drive system including a generator having a rotor and a pulsewidth modulation-controlled converter including a rotor-side inverter connected to said rotor;
- a grid-side inverter connected to the electrical grid;
- and, a DC link connecting said rotor-side inverter to said grid-side inverter;
- a first electrical circuit, said first circuit connecting said generator to said pulsewidth modulation-controlled converter;
- and, a second electrical circuit, said second circuit connecting said pulsewidth modulation-controlled converter to said electrical grid;
- the method comprising:
- in an event of a transient grid fault in the electrical grid, determining a frequency of a pulsewidth modulation in response to a current increase in at least one of said first electrical circuit and said second electrical circuit, wherein the current increase results from the transient grid fault;
- and,
- wherein, in the event of the transient grid fault, the frequency of the pulsewidth modulation is decreased in response to the current increase.
7 more elements
A wind turbine for operating in association with an electrical grid, the wind turbine comprising:
- a speed-variable drive system connectable to said electrical grid;
- said speed-variable drive system including a generator having a rotor and a pulsewidth modulation-controlled converter;
- said pulsewidth modulation-controlled converter including a rotor-side inverter connected to said rotor, a grid-side inverter connected to said electrical grid, and, a DC link connecting said rotor-side inverter to said grid-side inverter;
- a first electrical circuit, said first circuit connecting said generator to said pulsewidth modulation-controlled converter;
- a second electrical circuit, said second circuit connecting said pulsewidth modulation-controlled converter to said electrical grid;
- said pulsewidth modulation-controlled converter including a controller;
- said controller being configured to detect a transient grid fault in the electrical grid and to control said pulsewidth modulation-controlled converter via a pulsewidth modulation;
- and,
- in an event of the transient grid fault in the electrical grid, said controller being configured to detect a current increase in at least one of said first electrical circuit and said second electrical circuit, wherein the current increase results from the transient grid fault;
- and
- said controller being further configured to determine a frequency of said pulsewidth modulation in response to said current increase in at least one of said first electrical circuit and said second electrical circuit.
8 more elements
Dependencies are inferred from the claim text.