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Switching control systems and methods are presented for controlling power conversion systems to provide 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 (CS

Switching control systems and methods are presented for controlling power conversion systems to provide 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.

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1. A switch control system for providing pulse width modulated switching control signals with firing angle control for controlling a current source converter (CSC) in a power conversion system providing electrical power to a power grid, the switch control system comprising: a d-axis stator current c

1. A switch control system for providing pulse width modulated switching control signals with firing angle control for controlling a current source converter (CSC) in a power conversion system providing electrical power to a power grid, the switch control system comprising: a d-axis stator current control component operative to provide pulse width modulated CSR switching control signals with firing angle control to a current source rectifier (CSR) of the CSC to convert input power from a synchronous machine to intermediate DC in an intermediate circuit of the CSC and to selectively adjust a d-axis current of the synchronous machine to regulate a power factor of a CSC output according to at least one feedback value or signal. 2. The switch control system of claim 1, further comprising: a feedback system operative to sense a grid voltage and to provide a fault mode signal when the grid voltage is below a predetermined value;at least one resistor; andat least one switch. 3. The switch control system of claim 2, wherein the at least one switch is selectively operable according to the fault mode signal to couple the at least one resistor to one of an intermediate circuit and an input of the CSC to dissipate excess power in the fault mode. 4. The switch control system of claim 2, comprising a plurality of resistors, the at least one switch selectively operable according to the fault mode signal to couple the plurality of resistors to one of the intermediate circuit and the input to dissipate excess power in the fault mode. 5. The switch control system of claim 2, comprising a plurality of switches 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. 6. The switch control system of claim 1, wherein the system provides switching control signals with firing angle control for controlling a current source inverter (CSI) of the CSC. 7. The switch control system of claim 6, wherein an output current of the CSI is controlled to a leading angle relative to a grid voltage when a grid fault condition is detected, and to a relative lagging angle when no grid fault is detected. 8. The switch control system of claim 7, further comprising: a feedback system operative to sense a grid voltage and to provide a fault mode signal when the grid voltage is below a predetermined value;at least one resistor; andat least one switch selectively operable according to the fault mode signal to couple the at least one resistor to one of an intermediate circuit and an input of the CSC to dissipate excess power in a grid fault mode. 9. The switch control system of claim 1, wherein the d-axis stator current control component is operative to provide the pulse width modulated CSR switching control signals to the CSR to regulate the d-axis current of the synchronous machine to at least one non-zero value. 10. The switch control system of claim 9, wherein the d-axis stator current control component is operative to provide the CSR switching control signals to the CSR to regulate the d-axis current of the synchronous machine to the at least one non-zero value to affect the DC voltage and change an angle of a grid current relative to a grid voltage. 11. A switch control system for providing pulse width modulated switching control signals with firing angle control for controlling a current source converter (CSC) in a power conversion system providing electrical power to a power grid, the switch control system comprising: a feedback system operative to sense a grid voltage and to provide a fault mode signal when a grid fault is detected;at least one resistor; andat least one switch selectively operable according to the fault mode signal to couple the at least one resistor to one of an intermediate circuit and an input of the CSC to dissipate excess power in a fault mode. 12. The switch control system of claim 11, further comprising a d-axis stator current control component operative to provide pulse width modulated CSR switching control signals with firing angle control to a current source rectifier (CSR) of the CSC to convert input power from a synchronous machine to intermediate DC in an intermediate circuit of the CSC and to selectively adjust a d-axis current of the synchronous machine to regulate a power factor of a CSC output according to at least one feedback value or signal. 13. The switch control system of claim 12, wherein the d-axis stator current control component is operative to provide the CSR switching control signals to the CSR to regulate the d-axis current of the synchronous machine to at least one non-zero value. 14. The switch control system of claim 13, wherein the d-axis stator current control component is operative to provide the CSR switching control signals to the CSR to regulate the d-axis current of the synchronous machine to the at least one non-zero value to affect the DC voltage and change an angle of a grid current relative to a grid voltage. 15. The switch control system of claim 11, wherein the switch control system provides the switching control signals to control an output current of a current source inverter (CSI) of the CSC to a leading angle relative to a grid voltage when the fault mode signal indicates a grid fault condition, and to a lagging angle when the fault mode signal does not indicate a grid fault condition. 16. A method for controlling a power conversion system providing electrical power to a power grid, the method comprising: detecting a grid fault condition based on a sensed grid voltage;selectively dissipating excess power of the power conversion system through at least one resistor when a grid fault condition is detected; andcontrolling an output current of the power conversion system to a leading angle relative to the sensed grid voltage when a grid fault condition is detected. 17. The method of claim 16, further comprising controlling a rectifier of the power conversion system to convert input power from a synchronous machine to intermediate DC in an intermediate circuit of the power conversion system and to selectively adjust a d-axis current of the synchronous machine to regulate a power factor of an output of the power conversion system. 18. The method of claim 17, wherein controlling the rectifier to selectively adjust the d-axis current comprises regulating the d-axis current of the synchronous machine to at least one non-zero value. 19. The method of claim 16, comprising controlling the output current of the power conversion system to a desired angle when no grid fault is detected. 20. The method of claim 16, wherein controlling an output current of the power conversion system comprises providing pulse width modulated switching control signals with firing angle control to the power conversion system.