Power conversion system and controlling method thereof and wind turbine power generation system
AssigneeGeneral Electric Company
InventorsZhuohui Tan, Jinping Gao, Rajni Kant Burra, Govardhan Ganireddy
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Abstract
A system includes a source side converter for being electrically coupled to a generator of a power source, a line side converter for being electrically coupled to a power network, a DC link coupled between the source side converter and the line side converter, and a controller for generating source side switching signals based on a current or torque of the generator and a virtual impedance signal for system damping or reactive power compensation when at least one detected signal of the system is not normal. A method for controlling the system is also included.
Claims19
A power conversion system comprising:
- a source side converter for being electrically coupled to a generator of a power source;
- a line side converter for being electrically coupled to a power network;
- a DC link coupled between the source side converter and the line side converter;
- and
- a controller for generating source side switching signals for the source side converter based on a virtual impedance signal for system damping or reactive power compensation, and one of a current feedback signal of the generator or a torque feedback signal of the generator when at least one detected signal of the power conversion system is not normal.
A method for controlling a power generation system, wherein the power generation system comprises a source side converter, a line side converter and a DC link coupled between the source side converter and the line side converter, the method comprising:
- detecting at least one signal of the power generation system;
- determining whether the at least one signal is abnormal;
- and
- when any signal of the at least one signal is determined to be abnormal, generating source side switching signals for the source side converter based on a virtual impedance signal for system damping or reactive power compensation.
A wind turbine power generation system comprising:
- a wind turbine rotor for generating mechanical power;
- a generator for converting the mechanical power to electrical power;
- a converter for converting the electrical power to a desired electrical power for supplying to a power network, comprising a source side converter, a line side converter, and a DC link coupled between the source side converter and the line side converter;
- at least one sensor for obtaining at least one detected signal in the wind turbine power generation system;
- and
- a controller for generating source side switching signals for the source side converter based on a virtual impedance signal for system damping or reactive power compensation, and one of a current feedback signal of the generator or a torque feedback signal of the generator when the at least one detected signal of the wind turbine power generation system is not normal.
Dependencies are inferred from the claim text.