초록 ▼

The present techniques include methods and systems for operating a wind power system to maintain a lifespan of the rotor side converter. In some embodiments, the current of the rotor side converter may be minimized to reduce the stress and/or junction temperature variation in the switching transisto

The present techniques include methods and systems for operating a wind power system to maintain a lifespan of the rotor side converter. In some embodiments, the current of the rotor side converter may be minimized to reduce the stress and/or junction temperature variation in the switching transistors and bond wires of the converter. More specifically, embodiments involve using a minimal current in the rotor side converter based on the rotor side and grid side reactive powers. If the grid side reactive power is greater than a maximum grid side reactive power, the grid side reactive power may be reduced. Further, if the total reactive power does not meet the grid reactive power requirements, the minimal current in the rotor side converter may be adjusted such that the system may sufficiently power the grid.

대표청구항 ▼

1. A method of operating a power system, the method comprising: operating a rotor side converter of the power system with a minimal current, wherein the minimal current comprises approximately zero flux current;calculating a grid reactive power generated by a grid side converter of the power system;

1. A method of operating a power system, the method comprising: operating a rotor side converter of the power system with a minimal current, wherein the minimal current comprises approximately zero flux current;calculating a grid reactive power generated by a grid side converter of the power system;comparing the calculated reactive power with a maximum reactive power of the grid side converter;setting a reactive power command of the grid side converter to the maximum reactive power when the calculated reactive power is greater than the maximum reactive power;calculating a stator reactive power based on a total reactive power of the power system and the reactive power command of the grid side converter; andadjusting the minimal current to generate the stator reactive power. 2. The method of claim 1, wherein operating the rotor side converter with the minimal current comprises operating the rotor side converter with only torque current. 3. The method of claim 1, wherein calculating the grid reactive power comprises subtracting the required stator reactive power from the reactive power command. 4. The method of claim 1, comprising calculating the maximum reactive power based on an active power through the grid side converter or a rotor side converter, a supply voltage, and a grid side converter current. 5. The method of claim 1, comprising increasing the stator reactive power if the total reactive power does not substantially equal the reactive power command. 6. The method of claim 1, wherein adjusting the minimal current comprises increasing the minimal current to a current value at which the total reactive power substantially equals the reactive power command. 7. The method of claim 1, wherein the method is performed dynamically during operation of the power system. 8. The method of claim 1, wherein the method is performed at set time intervals. 9. The method of claim 1, wherein the method is performed whenever operating parameters of the power system change to result in calculating a different total reactive power. 10. A non-transitory computer readable medium comprising code carried out by one or more processors for control of power converters, the code being configured for executing the steps of: operating a rotor side converter of a power system with a minimal current, wherein the minimal current comprises approximately zero flux current;calculating a grid reactive power generated by a grid side converter;comparing the calculated grid reactive power with a maximum reactive power of the grid side converter;resetting the grid reactive power command to the maximum reactive power when the calculated grid reactive power is greater than the maximum reactive power;calculating a stator reactive power based on a total reactive power of the power system and the reactive power command of the grid side converter; and adjusting the minimal current to generate the stator reactive power.