Power conversion system for a multi-stage generator
Inactive Publication Date: 2011-10-06
EXRO TECH
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Benefits of technology
[0007]To take advantage of the electrical energy generated by the multi-stage generator, it is desirable to provide a power conversion system that combines and converts a portion, or all, of the electrical power waveforms generated by the multi-stage generator into a usable form consumable by an electrical load. The conversion system should m
Problems solved by technology
The power flow though a variable-speed conventional turbine / generator / transformer system is restricted in the range of power it can output, i.e., from a minimum output power to a rated output power, because of limitations of the generator, the power converter (if present), and the output transformer used within the system.
This restriction arises because a conventional electromagnetic generator has reduced efficiency at lower power levels, as does the power converter (if present) and particularly the transformer that couples power to the electrical load.
An electrical load such as an electric utility power grid may not be capable of consuming directly the electrical power that is generated by a multi-stage generator, as the power generated may not be in the correct form, for example, with respect to waveform shape as a function of time, voltage amplitude, current amplitude, phase, and / or frequency, as may be required by the electrical load.
Converters may be designed for a specific rating of the input voltage range (e.g. 1000 VAC-rms to 2000 VAC-rms) and input current range rating (e.g. 100 A-rms to 500 A-rms), but if the input voltage or input current (and therefore power level) do not meet or exceed the levels for which the converter is designed, then the converter may not be capable of operation, or the converter may operate in an inefficient manner.
For a multi-stage generator a single power converter is unlikely to accommodate the widely varying voltage waveforms and power range that is generated.
Moreover, a single power transformer delivering power to the electrical load, connected to one or more converters, is unlikely to accommodate with reasonable efficiency the wide range of power that may be generated by a multi-stage generator.
Method used
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Definitions
[0027]In this document, the following terms will have the following meanings:
[0028]“energy source” means a fluid medium, for example such as air, water, or steam, in motion, possessing kinetic energy due to translational motion.
[0029]“prime mover” means a device, such as a turbine or drive motor acted on by a power source, such as an energy source, to produce mechanical energy.
[0030]“turbine” means a device, usually including blades or fins, connected to a shaft, that are acted upon by an energy source to produce mechanical energy in the form of rotational motion of the shaft. It includes turbines used to harness energy from wind, tide, run-of-river and solar and other renewable energy sources.
[0031]“multi-stage generator” means an electromagnetic machine that converts mechanical energy from a turbine into electrical energy. Electrical power may be generated by a multi-stage generator from a number of induction elements that can each produce a voltage. Some induction elem...
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An electric power generation system is provided, including a generator having a plurality of stages engaged by a prime mover; and a plurality of branches for connecting the stages to an electrical load, each of the branches having a switch for connecting or disconnecting the branch to the stages. Power from a prime mover, such as a turbine, is sent by a controller to one or more of the branches as appropriate to handle the power level generated.
Description
FIELD OF THE INVENTION[0001]This application relates to circuit topologies and associated control processes for converting power generated via an electromagnetic machine into usable power, and more particularly for converting power generated from a multi-stage electrical generator into a usable form of power for consumption by an electrical load, such as, but not restricted to, an electric utility power grid.BACKGROUND OF THE INVENTION[0002]For conventional fluid-flow electrical-generation turbine systems, such as wind turbine systems, in which the energy source is variable (i.e. the fluid speed and the rate of flow of the fluid varies over time), the amount of energy captured from the energy source may only be a fraction of the total of the energy that may be capturable over time. For example, in a typical wind farm, that fraction may be one half, or less.[0003]The power flow though a variable-speed conventional turbine / generator / transformer system is restricted in the range of pow...
Claims
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Login to View More IPC IPC(8): H02P9/00
CPCH02P2101/15H02P9/02F03D9/255F03D15/10Y02E10/72Y02E10/76H02K7/116H02K7/1823
InventorRITCHEY, JONATHANNOWICKI, EDWINCHAN, RICHERD
OwnerEXRO TECH