Reconnecting a wind power plant to a utility grid

摘要

It is described a method for coupling plural wind turbines to a utility grid after the wind turbines have been disconnected from the utility grid, the method comprising: closing a main breaker arranged between the utility grid and a main transformer resulting in reactive current flowing from the utility grid to the main transformer; closing a first feeder switch arranged between the main transformer and a first group of wind turbines of the plural wind turbines; selecting a first reference voltage; operating first converters of the first group of wind turbines in a voltage control mode according to the first reference voltage; and closing a second feeder switch.

主权项

1. Method for coupling plural wind turbines to a utility grid after the wind turbines have been disconnected from the utility grid, the method comprising:
closing a main breaker arranged between the utility grid and a main transformer resulting in reactive current flowing from the utility grid to the main transformer; closing a first feeder switch arranged between the main transformer and a first group of wind turbines of the plural wind turbines resulting in reactive current flowing from the main transformer to first wind turbine transformers of the first group of wind turbines; selecting a first reference voltage based on an expected voltage drop that occurs when a second feeder switch arranged between the main transformer and a second group of wind turbines of the plural wind turbines is closed, the first group comprising a smaller number of wind turbines than the second group of wind turbines; operating first converters of the first group of wind turbines in a voltage control mode according to the first reference voltage; and closing the second feeder switch.