Method and arrangement for feeding electrical power from a wind energy installation into an AC voltage system

摘要

Electrical power is fed from a wind energy installation into an AC voltage system via an energy transmission path, which is delimited by an installation-side transformer and a system-side transformer. A power factor correction device is connected, at a common node between the energy transmission path and the AC voltage system using a closed-loop control device, which controls the wind energy installation and which receives a variable which is proportional to the reactive power on the energy transmission path and a further measured variable. A measurement signal produced at the output of the power factor correction device is used as further measured variable. The closed-loop controller has such a control characteristic that the voltage on the low-voltage side of the system-side transformer increases, depending on the reactive power on the energy transmission path, from the inductive range to the capacitive range.

主权项

1. A method of operating a system for feeding electrical power from a wind energy installation into an AC voltage system via an energy transmission path, which is delimited on one side by an installation-side transformer and on another side by a system-side transformer with a power factor correction device connected thereto, at a common node between the energy transmission path and the AC voltage system, the method comprising:
determining a variable that is proportional to a reactive power on the energy transmission path; obtaining a measurement signal at an output of the power factor correction device as a further measured variable; providing a closed-loop control device for controlling the wind energy installation and inputting to the closed-loop control device the variable that is proportional to the reactive power on the energy transmission path and the further measured variable; and operating the closed-loop control device with a control characteristic such that a voltage on a low-voltage side of the system-side transformer increases from an inductive range to a capacitive range depending on the reactive power on the energy transmission path.