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US 8,030,791 B2Granted
Current source converter-based wind energy system
AssigneeRockwell Automation Technologies, Inc.
InventorsYongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
Life of this patent
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Abstract
Power conversion apparatus and methods are presented for providing electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.
Claims22
A current source converter for converting input electrical power to output electrical power, comprising:
- an input for receiving input electrical power from a synchronous machine;
- an output for providing output electrical power to a power grid;
- an intermediate circuit with at least one storage element;
- a current source rectifier (CSR) comprising a plurality of switching devices coupled with the input and the intermediate circuit and operative according to a plurality of CSR switching control signals to selectively couple the input to the intermediate circuit;
- a current source inverter (CSI) comprising a plurality of switching devices coupled with the intermediate circuit and the output and operative according to a plurality of CSI switching control signals to selectively couple the intermediate circuit to the output;
- a feedback system operatively coupled with the output and providing at least one feedback value or signal indicative of one or more electrical conditions at the output;
- and
- a switch control system operatively coupled with the feedback system and with the CSR to provide pulse width modulated firing angle control CSR switching control signals to the CSR to convert input power from the synchronous machine to intermediate DC in the intermediate circuit, with the switch control system providing the CSR switching control signals to selectively adjust a d-axis current of the synchronous machine to regulate power factor of the output according to the at least one feedback value or signal.
5 more elements
A power conversion system for providing electrical power to a power grid, comprising:
- a synchronous machine with a rotor adapted to be driven by a prime mover and a generator output providing multiphase electrical output power when the rotor is driven;
- and
- a current source converter for converting input electrical power to output electrical power, comprising:
- an input operatively coupled with the generator output of the synchronous machine to receive input electrical power from the generator output;
- an output for providing output electrical power to a power grid;
- an intermediate circuit with at least one storage element;
- a current source rectifier (CSR) comprising a plurality of switching devices coupled with the input and the intermediate circuit and operative according to a plurality of CSR switching control signals to selectively couple the input to the intermediate circuit;
- a current source inverter (CSI) comprising a plurality of switching devices coupled with the intermediate circuit and the output and operative according to a plurality of CSI switching control signals to selectively couple the intermediate circuit to the output;
- a feedback system operatively coupled with the output and providing at least one feedback value or signal indicative of one or more electrical conditions at the output;
- and
- a switch control system operatively coupled with the feedback system and with the CSR to provide pulse width modulated CSR switching control signals with firing angle control to the CSR to convert input power from the synchronous machine to intermediate DC in the intermediate circuit, with the switch control system providing the CSR switching control signals to selectively adjust a d-axis current of the synchronous machine to regulate power factor of the output according to the at least one feedback value or signal.
8 more elements
A current source converter for converting input electrical power to output electrical power, comprising:
- an input for receiving input electrical power from a synchronous machine;
- an output for providing output electrical power to a power grid;
- an intermediate circuit with at least one storage element;
- a current source rectifier (CSR) comprising a plurality of switching devices coupled with the input and the intermediate circuit and operative according to a plurality of CSR switching control signals to selectively couple the input to the intermediate circuit;
- a current source inverter (CSI) comprising a plurality of switching devices coupled with the intermediate circuit and the output and operative according to a plurality of CSI switching control signals to selectively couple the intermediate circuit to the output;
- a feedback system operatively coupled with the output and providing at least one feedback value or signal indicative of one or more electrical conditions at the output, the feedback system being operative to sense a grid voltage and to provide a fault mode signal when the grid voltage is below a predetermined value;
- a switch control system operatively coupled with the feedback system and with the CSR to provide pulse width modulated CSR switching control signals with firing angle control to the CSR to convert input power from the synchronous machine to intermediate DC in the intermediate circuit, the switch control system being operatively coupled with the CSI to provide pulse width modulated CSI switching control signals with firing angle control to the CSI to provide output electrical power to the grid;
- at least one resistor;
- and
- at least one switch selectively operable according to the fault mode signal to couple the at least one resistor to one of the intermediate circuit and the input to dissipate excess power in the fault mode.
7 more elements
A power conversion system for providing electrical power to a power grid, comprising:
- a synchronous machine with a rotor adapted to be driven by a prime mover and a generator output providing multiphase electrical output power when the rotor is driven;
- and
- a current source converter for converting input electrical power to output electrical power, comprising:
- an input for receiving input electrical power from a synchronous machine;
- an output for providing output electrical power to a power grid;
- an intermediate circuit with at least one storage element;
- a current source rectifier (CSR) comprising a plurality of switching devices coupled with the input and the intermediate circuit and operative according to a plurality of CSR switching control signals to selectively couple the input to the intermediate circuit;
- a current source inverter (CSI) comprising a plurality of switching devices coupled with the intermediate circuit and the output and operative according to a plurality of CSI switching control signals to selectively couple the intermediate circuit to the output;
- a feedback system operatively coupled with the output and providing at least one feedback value or signal indicative of one or more electrical conditions at the output, the feedback system being operative to sense a grid voltage and to provide a fault mode signal when the grid voltage is below a predetermined value,
- a switch control system operatively coupled with the feedback system and with the CSR to provide pulse width modulated CSR switching control signals with firing angle control to the CSR to convert input power from the synchronous machine to intermediate DC in the intermediate circuit, the switch control system being operatively coupled with the CSI to provide pulse width modulated CSI switching control signals with firing angle control to the CSI to provide output electrical power to the grid;
- at least one resistor;
- and
- at least one switch selectively operable according to the fault mode signal to couple the at least one resistor to one of the intermediate circuit and the input to dissipate excess power in the fault mode.
10 more elements
A current source converter (CSC) based motor drive, comprising:
- an input for receiving input electrical power from a grid;
- an output for providing output electrical power to a synchronous motor;
- an intermediate circuit with at least one storage element;
- a current source rectifier (CSR) comprising a plurality of switching devices coupled with the input and the intermediate circuit and operative according to a plurality of CSR switching control signals to selectively couple the input to the intermediate circuit;
- a current source inverter (CSI) comprising a plurality of switching devices coupled with the intermediate circuit and the output and operative according to a plurality of CSI switching control signals to selectively couple the intermediate circuit to the output;
- a feedback system operatively coupled with the output and providing at least one feedback value or signal indicative of one or more electrical conditions at the input;
- and
- a switch control system operatively coupled with the feedback system and with the CSR to provide pulse width modulated CSR switching control signals with firing angle control to the CSR to convert input power from the grid to intermediate DC in the intermediate circuit, the switch control system being further operatively coupled with the CSI to provide pulse width modulated CSI switching control signals with firing angle control to the CSI to provide output electrical power to the synchronous motor, with the switch control system providing the CSI switching control signals to selectively adjust a d-axis current of the synchronous motor to regulate power factor of the input according to the at least one feedback value or signal.
5 more elements
Dependencies are inferred from the claim text.