Method of loadshedding for a variable speed, constant frequency generator
First Claim
1. A method of controlling an engine-driven, electrical generator system configured to generate an alternating current (AC) power at a desired output frequency for a plurality of electrical loads, comprising the steps of:
- determining a value of the AC power output by the generator system at least once during each electrical cycle of the AC power;
detecting a change in the value of the AC power output greater than a preset threshold;
opening a switch to disconnect at least one of the electrical loads from the generator system responsive to detecting the change in the value of the AC power output greater than the preset threshold;
accelerating the engine to a maximum operating speed; and
closing the switch to reconnect the at least one electrical load to the generator system upon acceleration of the engine to the maximum operating speed.
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Accused Products
Abstract
A method of controlling operation of a variable speed, constant frequency generator system is disclosed. During operation, loads may be added to or removed from the output of the generator system. A controller monitors the power output by the generator system and detects a change in the output power exceeding a predefined threshold. The change indicates the addition of a large electrical load. The controller quickly detects the change in power output and activates a relay to disconnect the load from the generator system. The controller then accelerates the engine of the generator system to maximum speed and reconnects the load to the output of the generator system.
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Citations
15 Claims
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1. A method of controlling an engine-driven, electrical generator system configured to generate an alternating current (AC) power at a desired output frequency for a plurality of electrical loads, comprising the steps of:
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determining a value of the AC power output by the generator system at least once during each electrical cycle of the AC power; detecting a change in the value of the AC power output greater than a preset threshold; opening a switch to disconnect at least one of the electrical loads from the generator system responsive to detecting the change in the value of the AC power output greater than the preset threshold; accelerating the engine to a maximum operating speed; and closing the switch to reconnect the at least one electrical load to the generator system upon acceleration of the engine to the maximum operating speed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling an engine-driven, electrical generator system, wherein an engine of the generator system is configured to operate at an engine speed and the generator system is configured to generate an alternating current (AC) power having a desired output frequency, the method comprising the steps of:
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running the engine at a first engine speed; connecting a load to an output of the generator system; detecting a change in a value of the AC power output greater than a preset threshold within two electrical cycles of the AC power; disconnecting at least a portion of the load from the output of the generator system; accelerating the engine to a maximum operating speed; and reconnecting the disconnected portion of the load to the output of the generator system upon acceleration of the engine to the maximum operating speed. - View Dependent Claims (8, 9, 10, 11)
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12. A method of controlling an engine-driven, electrical generator system, wherein an engine of the generator system is configured to operate at an engine speed and the generator system is configured to generate an alternating current (AC) power having a desired output frequency, the method comprising the steps of:
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running the engine at a first engine speed; connecting a load to an output of the generator system; detecting a decrease in the engine speed greater than a preset threshold; disconnecting at least a portion of the load from the output of the generator system; accelerating the engine to a maximum operating speed; and reconnecting the disconnected portion of the load to the output of the generator system upon acceleration of the engine to the maximum operating speed. - View Dependent Claims (13, 14, 15)
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Specification