Method for operating a wind turbine and wind turbine
AssigneesNordex Energy GmbH, Ingenieurbuero Hoffmann GmbH
InventorsChristian Wessels, Nils Hoffmann
Life of this patent
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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.
Claims20
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 and a pulsewidth modulation-controlled converter;
- a first electrical circuit, said first electrical circuit connecting said generator to said pulsewidth modulation-controlled converter;
- and, a second electrical circuit, said second electrical circuit connecting said pulsewidth modulation-controlled converter to said electrical grid;
- the method comprising:
- 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 based on the measured current, wherein the current increase is indicative of a transient grid fault;
- and,
- determining a frequency of a pulsewidth modulation in response to said current increase.
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 and a pulsewidth modulation-controlled converter;
- a first electrical circuit, said first electrical circuit connecting said generator to said pulsewidth modulation-controlled converter;
- a second electrical circuit, said second electrical circuit connecting said pulsewidth modulation-controlled converter to said electrical grid;
- said pulsewidth modulation-controlled converter including a controller;
- said controller being configured to control said pulsewidth modulation-controlled converter via a pulsewidth modulation;
- and,
- said controller being configured to measure current in at least one of said first electrical circuit and said second electrical circuit and to detect a current increase in at least one of said first electrical circuit and said second electrical circuit, wherein said current increase is indicative of a transient grid fault;
- and
- said controller being further configured to determine a frequency of said pulsewidth modulation in response to said current increase.
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 and a pulsewidth modulation-controlled converter;
- a first electrical circuit, said first electrical circuit connecting said generator to said pulsewidth modulation-controlled converter;
- and, a second electrical circuit, said second electrical circuit connecting said pulsewidth modulation-controlled converter to said electrical grid;
- the method comprising:
- 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 based on the measured current;
- detecting a transient grid fault on a basis of the detected current increase;
- and,
- determining a frequency of a pulsewidth modulation in response to said current increase.
Dependencies are inferred from the claim text.