High frequency bus method
View Patent ↗Certain exemplary embodiments can include a system comprising an electric drive system for a machine. The system can include a rectifier adapted to convert AC power from an alternator to DC power. The system can include an inverter adapted to receive DC power from the rectifier and provide power to a traction motor and/or auxiliary devices. Certain exemplary embodiments can include a system and method for dissipating excess energy from a machine.
1. A method comprising:
via an electric drive system for a mining machine:
at an active Insulated Gate Bipolar Transistor rectifier, converting a first AC signal from an alternator to a DC signal, the active Insulated Gate Bipolar Transistor rectifier electrically coupled to a DC bus; and
via an active Insulated Gate Bipolar Transistor inverter electrically coupled to the DC bus, generating a space vector modulated AC signal, further comprising:
at an active Insulated Gate Bipolar Transistor DC chopper, converting an unmodulated DC signal received from the DC bus to a modulated DC signal; and
providing the modulated DC signal to a heat sink.
2. The method of claim 1 , further comprising:
from the active Insulated Gate Bipolar Transistor rectifier, providing the DC signal to the DC bus.
3. The method of claim 1 , further comprising:
at the active Insulated Gate Bipolar Transistor DC chopper, receiving the unmodulated DC signal from the DC bus.
4. The method of claim 1 , further comprising:
via an internal combustion engine mechanically coupled to the alternator, transmitting mechanical energy to the alternator.
5. The method of claim 1 , further comprising:
varying a voltage on the DC bus responsive to a changed speed of an internal combustion engine mechanically coupled to the alternator.
6. The method of claim 1 , further comprising:
varying a voltage on the DC bus is responsive to a changed alternator excitation.
7. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor rectifier, limiting harmonic current distortion to approximately 5 percent.
8. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor rectifier, limiting harmonic current distortion to approximately 3 percent.
9. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor rectifier, limiting harmonic current distortion to approximately 2 percent.
10. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor rectifier, providing an active input power factor correction to approximately 0.98.
11. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor rectifier, providing an active input power factor correction to approximately 0.99.
12. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor rectifier, providing an active input power factor correction to approximately 1.0.
13. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor inverter, providing a sinusoidal output current with less than approximately 5 percent total harmonic distortion to a traction motor comprised by the electric drive system.
14. The method of claim 1 , further comprising:
via the active Insulated Gate Bipolar Transistor inverter, providing a second AC signal to a traction motor comprising a double stator winding, the traction motor comprised by the electric drive system.