Electricity power generation shafts

This extra shaft work will be converted to electrical power. That is, the three-phase motor will turn into an electrical power generator. It will begin to export electricity into the grid. A two-phase motor does not have this sort of capability. 

The inertia and damping characteristics can be represented by an accelerating power term and a frictional or damping power term in a simplified second-order differential equation for each generator. Also in the eqnation is a term for the electrical power generated. The right-hand side of the equation represents the mechanical power that is applied to the shaft of the generator. 

TTiree-Shaft Aircraft Engine Modified for Electric Power Generation... 2-43... 

Hi/ume, A., Transient Torsional Vibration of Steam Turbine and Generators Shafts due to High Speed Reclosing of Electric Power Lines, ASME... 

The most recent system is a 220 kilowatt fuel cell/gas turbine power plant operating at the University of California s National Fuel Cell Research Center located in Irvine, California. The first-of-a-kind hybrid power plant consists of a 200 kilowatt fuel cell generator pressurized at about 3.5 atmospheres in combination with a 20 kilowatt two-shaft gas turbine. The system was first run at the Pittsburgh facility and started operating at Irvine in June, 2000. Total run time until July, 2000 was 264 hours. Electric energy delivered was 42 megawatt-hours. Electric efficiency was 51% (LHV). An electric power feed-through mounted on the pressure vessel devel-... 

In the single-shaft arrangement, there is only one electric generator, driven by both the gas turbine and the steam turbine. This means that the electric power plant is simpler, because there is only one step-up transformer and one bay to connect to the grid. 

At 1 bar and 1300K, AGf = —175.8 and A = —56.81, and for the Faradaic reformer AG = —103.3/3 = —34.43 and A = 254.6/3 X (1002/1000) = 85.04. The Faradaic reformer is now somewhat awkward. It needs a large supply of reversible heat at 1300 K from a heat pump or from the fuel cell, and provides an electrical output. Current from the fuel cell would have two functions. Firstly to generate shaft power to supply the missing part of the Carnot input of the reformer, 85.04 — 56.81, and secondly to power a motor generator, with the correct potential difference, to back off the current output of the reformer. Circulator power is not required to complete the transaction. 

A number of technologies are commercially available for generating electric power or mechanical shaft power onsite or near-site where the power is used. The three major categories for distributed generation are combustion turbines, IC engines, and fuel cells. 

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