Electrical system for turbine/alternator on common shaft
First Claim
1. An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator on a common shaft comprising:
- a) said alternator having a permanent magnet rotor and a stator winding;
b) an AC bus connected to the stator winding;
c) an AC output circuit;
d) an inverter connected to the AC output circuit;
e) a first contactor for connecting the inverter to the AC bus;
f) a DC bus connected to the inverter;
g) a rectifier connected between the AC bus and the DC bus;
h) a temporary power supply connected to the DC bus;
i) a driver connected to cause switching of the inverter;
j) a signal generator driven by signals derived from the rotation of the common shaft;
k) an open loop waveform generator;
l) a second contactor for connecting either the signal generator or the open loop waveform generator to the inverter; and
m) a system controller for during a startup mode switching the first contactor to connect the inverter circuit to the AC bus and switching the second contactor to connect the signal generator to the driver and during a power out mode switching the first contactor to disconnect the inverter from the AC bus and switching the second contactor to connect the open loop waveform generator to the driver;
whereby during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs to the AC output circuit, AC electric power having a frequency unrelated to the rotational speed of the alternator.
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Accused Products
Abstract
An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator rotating on a common shaft comprises an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs to the AC output circuit, electrical power having a frequency unrelated to the rotational speed of the alternator.
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Citations
17 Claims
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1. An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator on a common shaft comprising:
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a) said alternator having a permanent magnet rotor and a stator winding;
b) an AC bus connected to the stator winding;
c) an AC output circuit;
d) an inverter connected to the AC output circuit;
e) a first contactor for connecting the inverter to the AC bus;
f) a DC bus connected to the inverter;
g) a rectifier connected between the AC bus and the DC bus;
h) a temporary power supply connected to the DC bus;
i) a driver connected to cause switching of the inverter;
j) a signal generator driven by signals derived from the rotation of the common shaft;
k) an open loop waveform generator;
l) a second contactor for connecting either the signal generator or the open loop waveform generator to the inverter; and
m) a system controller for during a startup mode switching the first contactor to connect the inverter circuit to the AC bus and switching the second contactor to connect the signal generator to the driver and during a power out mode switching the first contactor to disconnect the inverter from the AC bus and switching the second contactor to connect the open loop waveform generator to the driver;
whereby during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs to the AC output circuit, AC electric power having a frequency unrelated to the rotational speed of the alternator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification