公开(公告)号：US20190058426A1

公开(公告)日：2019-02-21

申请号：US16104991

申请日：2018-08-20

Applicant: GE Energy Power Conversion Technology Ltd

Inventor： Kai Alexander Rothenhagen ,  Piotr Sadowski

IPC: H02P9/30 ,  H02P9/00 ,  H02P9/10 ,  F03B13/06

CPC classification number: H02P9/305 ,  F03B13/06 ,  H02P9/007 ,  H02P9/102 ,  H02P23/08 ,  H02P29/68 ,  H02P2101/10 ,  H02P2103/10

Abstract: A system and method of operating a pumped storage power plant using a double fed induction machine with a frequency converter in a rotor circuit is disclosed. A current target value for the rotor current frequency is determined based on a target power to be transmitted between an electrical grid and the double fed induction machine depending on measured actual operating variables. A current inadmissible synchronous deadband is determined depending on variables characterizing a current state of the pumped storage power plant. The synchronous deadband is determined by a permissible minimum required rotor current frequency or speed difference of the rotor speed from the synchronous speed for the stationary operation. The converter is controlled to generate voltages and currents with the current target value of the rotor current frequency if the current target value of the rotor current frequency or speed does not fall in the current inadmissible synchronous deadband.

公开(公告)号：US10554160B2

公开(公告)日：2020-02-04

申请号：US16104991

申请日：2018-08-20

Applicant: GE Energy Power Conversion Technology Ltd

Inventor： Kai Alexander Rothenhagen ,  Piotr Sadowski

IPC: H02P9/30 ,  H02P9/00 ,  F03B13/06 ,  H02P9/10 ,  H02P101/10

Abstract: A system and method of operating a pumped storage power plant using a double fed induction machine with a frequency converter in a rotor circuit is disclosed. A current target value for the rotor current frequency is determined based on a target power to be transmitted between an electrical grid and the double fed induction machine depending on measured actual operating variables. A current inadmissible synchronous deadband is determined depending on variables characterizing a current state of the pumped storage power plant. The synchronous deadband is determined by a permissible minimum required rotor current frequency or speed difference of the rotor speed from the synchronous speed for the stationary operation. The converter is controlled to generate voltages and currents with the current target value of the rotor current frequency if the current target value of the rotor current frequency or speed does not fall in the current inadmissible synchronous deadband.

公开(公告)号：US10090776B2

公开(公告)日：2018-10-02

申请号：US15408443

申请日：2017-01-18

Applicant: GE Energy Power Conversion Technology Ltd

Inventor： Duro Basic ,  Kai Alexander Rothenhagen

IPC: H02M7/48 ,  H02M1/32 ,  H02M1/084 ,  H02M7/5387 ,  H02M1/00

Abstract: A method is disclosed to protect a power converter arrangement with a power converter that has a DC side that is connected to a DC intermediate circuit, an AC side, and controllable switches that can be controllably switched at a high frequency to invert the DC voltage of the DC intermediate circuit into an AC voltage. A protective device that can be activated and deactivated is provided to protect the power converter from overload by connecting an external thyristor rectifier bridge with a brake resistor (Rb ext) to the AC side of the power converter. If a predetermined error situation is detected, the external thyristors are triggered to turn on, to activate the protective device. If it is detected that the predetermined error situation has disappeared, the external thyristors are turned off. A power converter arrangement with a device to protect against overload is also disclosed.