Distinguishing between different transient conditions for an electric power generation system
First Claim
1. A method, comprising:
- operating an electric power generation system including a variable speed generator coupled to a DC bus, an electrical energy storage device coupled to the DC bus, and an inverter coupled to the DC bus;
generating an AC electric power output from the inverter by providing at least one of variable AC power from the generator and DC power from the electrical energy storage device;
evaluating change in electrical loading of the system to distinguish between three or more different transient conditions; and
providing different transient responses of the system in accordance with the different transient conditions.
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Abstract
An electric power generation system is described can include a variable speed generator and an engine driving the generator to provide an AC electric power output. The output is monitored for different types of transient conditions. For example, electric current of the output is evaluated to identify a first type of transient condition and power factor of the output is evaluated to identify a second type of transient condition. System adjustment is made based on the condition type. In one form, the system is used to provide electricity on board a vehicle such as a motor coach, ship, or the like. In other forms, the system provides electric power to a remote building that does not have access to a public power grid or the system provides back-up power in case of power grid failure or the like.
103 Citations
25 Claims
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1. A method, comprising:
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operating an electric power generation system including a variable speed generator coupled to a DC bus, an electrical energy storage device coupled to the DC bus, and an inverter coupled to the DC bus; generating an AC electric power output from the inverter by providing at least one of variable AC power from the generator and DC power from the electrical energy storage device; evaluating change in electrical loading of the system to distinguish between three or more different transient conditions; and providing different transient responses of the system in accordance with the different transient conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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carrying a mobile electric power generation system and multiple air conditioners with a vehicle, the electric power generation system including a variable speed generator and engine driving the variable speed generator; evaluating electrical load change to distinguish between start-up of two or more of the air conditioners and start-up of a single one of the air conditioners; and providing a first transient response of the system to the start-up of the two or more air conditioners and a second transient response of the system to the start-up of the single one of the air conditioners, the first transient response and the second transient response being different. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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carrying a mobile electric power generation system with a vehicle, the electric power generation system including a variable speed generator and engine driving the variable speed generator to provide an AC electric power output with a target waveform period; evaluating electric current of the AC electric power output over each of a number of different time segments of the target waveform period to identify a first type of transient condition; evaluating power factor of the AC electric power output over a time period greater than the waveform period to identify a second type of transient condition; and adjusting operation of the system based on transient condition type. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system, comprising:
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an engine; a variable speed generator mechanically coupled to the engine, the engine being structured to drive the generator to provide variable frequency AC power; an electrical energy storage device; and power control circuitry including a rectifier to convert the variable frequency AC power to DC power, a DC bus coupled to the rectifier and the electrical energy storage device, an inverter coupled to the DC bus to provide a regulated AC electric power output, and a sensing arrangement to monitor the power output, the circuitry being structured to control electrical energy exchange between the DC bus and the electrical energy storage device, the circuitry further including operating logic to evaluate change in electrical loading of the system to distinguish between three or more different transient conditions and generate output signals to adjust at least one of the generator and the electrical energy exchange between the DC bus and the electrical energy storage device. - View Dependent Claims (22, 23, 24, 25)
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Specification