Device, system, and method for providing a low-voltage fault ride-through for a wind generator farm
First Claim
1. A device for controlling voltage on a collector bus in operational association with at least one wind turbine generator having an output with at least one phase, the device comprising:
- a controllable resistance that is disposed between the collector bus and a load of each phase of the output, the controllable resistance including;
a controllable resistor bank to provide a variable resistance, wherein the resistor bank is structured and arranged to absorb real power generated by the at least one wind turbine generator when a voltage drop or a voltage sag occurs on the load and to maintain the voltage on the collector bus at or above a predetermined threshold voltage level, andat least one switching device in parallel with the controllable resistor bank, that passes collector bus current to the load when closed and that diverts collector bus current to the resistor bank when open; and
a controller that is structured and arranged to receive current level and voltage level data and, based on current level and voltage level data, to provide gating signals to open or close the at least one switching device, to adjust the variable resistance of the resistor bank.
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Accused Products
Abstract
A device, a system, and a method for preventing power-producing wind turbine generators from tripping due to the detection of a low-voltage condition on a power grid are disclosed. The disclosed device includes a resistor bank that absorbs real power and a control system that maintains the collector bus voltage above a threshold voltage level during the duration of low-voltage condition on the power grid. Collector bus voltage is maintained using gating signals that include phase delay angles to adjust the opening/closing of the switching devices.
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Citations
26 Claims
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1. A device for controlling voltage on a collector bus in operational association with at least one wind turbine generator having an output with at least one phase, the device comprising:
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a controllable resistance that is disposed between the collector bus and a load of each phase of the output, the controllable resistance including; a controllable resistor bank to provide a variable resistance, wherein the resistor bank is structured and arranged to absorb real power generated by the at least one wind turbine generator when a voltage drop or a voltage sag occurs on the load and to maintain the voltage on the collector bus at or above a predetermined threshold voltage level, and at least one switching device in parallel with the controllable resistor bank, that passes collector bus current to the load when closed and that diverts collector bus current to the resistor bank when open; and a controller that is structured and arranged to receive current level and voltage level data and, based on current level and voltage level data, to provide gating signals to open or close the at least one switching device, to adjust the variable resistance of the resistor bank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A device for controlling voltage on a collector bus, the device being disposed between at least one wind turbine generator having an output with at least one phase and a utility grid point of common coupling (PCC) and the collector bus being in operational association with said at least one wind turbine generator, the device comprising:
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a controllable resistance that is disposed between the collector bus and the utility grid PCC of each phase of the output, the controllable resistance including; a controllable resistor bank to provide a variable resistance, wherein the resistor bank is structured and arranged to absorb real power generated by the at least one wind turbine generator when a low-voltage fault event occurs at the utility grid PCC and to maintain the voltage of the collector bus at or above a predetermined threshold voltage level, and at least one switching device in parallel with the controllable resistor bank, that passes collector bus current to the utility grid PCC when closed and that diverts collector bus current to the resistor bank when open; and a controller that is structured and arranged to receive current level and voltage level data and, based on current level and voltage level data, to provide gating signals to open or close the at least one switching device, to adjust the variable resistance of the resistor bank.
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25. A device for controlling voltage on a collector bus, the device being disposed between two power sources and the collector bus being in operational association with one of the power sources, the device comprising:
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a controllable resistance that is disposed between the collector bus and the utility grid PCC of each phase of the output, the controllable resistance including; a controllable resistor bank to provide a variable resistance, wherein the resistor bank is structured and arranged to absorb real power generated by the at least one wind turbine generator when a low-voltage fault event occurs at the utility grid PCC and to maintain the voltage of the collector bus at or above a predetermined threshold voltage level, and at least one switching device in parallel with the controllable resistor bank, that passes collector bus current to the utility grid PCC when closed and that diverts collector bus current to the resistor bank when open; and a controller that is structured and arranged to receive current level and voltage level data and, based on current level and voltage level data, to provide dating signals to open or close the at least one switching device, to adjust the variable resistance of the resistor bank. - View Dependent Claims (26)
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Specification