48.Power Systems by John G. Webster (Editor)

By John G. Webster (Editor)

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Solar Thermal Systems. Solar thermal electric (STE) technologies, which include parabolic troughs, power towers, and dish/engine systems, convert sunlight into electricity efficiently and with minimum effect on the environment. These technologies generate high temperatures by using mirrors to concentrate the sun’s energy up to 5000 times its normal intensity. This heat is then used to generate electricity for a variety of market applications, ranging from remote power 307 needs as small as a few kilowatts up to grid-connected applications of 200 MW or more.

Moreover, as a cogeneration system has always at least one degree of freedom, changing prices and changing thermal and electrical demand pose the question of what is the optimum operating point for each set of demands and prices. While for one-degree-of-freedom systems the answer may be found without resorting to sophisticated numerical techniques, for multi-degree-of-freedom systems the task is rather complex. Although the subject of cogeneration system optimization has been addressed in quite a number of papers, the authors usually have referred to steady-state or design operation and/or neglected the variability of the prices of electricity and heat.

GENERATION SCHEDULING FOR ELECTRICITY PRICING IN A DEREGULATED POWER MARKET The unit commitment problem is to determine which units in a GENCO should be on-line at a given hour in the deregulated power marketplace. In a deregulated power marketplace, the modified load is not equal to the local load. It can be higher or lower depending on the market price. If the spot price in the marketplace is high, then the modified load in a GENCO is high and vice versa. There must be some methodology to determine the modified load for GENCOs so that they can commit their units to maximize their profits.

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