7416Cost Function Minimization

The cost function for the DG control is the sum of all operating costs. Components of the cost equation that increase the operating costs include:

• Grid electricity consumption at meter (in kWh)

• Grid electricity demand (in kW)

• Grid gas consumption at meter (in either energy content or volume used)

• Grid gas consumption by DG equipment (in either energy content or volume used)

• Operation and maintenance costs (variable as a function of run time; see below for fixed O&M costs)

Components of the cost equation that decrease the operating costs include:

• Grid electricity consumption reduction due to local DG

• Grid gas consumption reduction from DG cogeneration (if used)

• Grid electricity consumption reduction from supplementary cooling supplied by DG cogeneration (if used)

• Revenue from sale of ancillary services (per VAR, energy, or other unit)

• Utility incentives (per kWh produced locally)

• Utility electricity buyback (per kWh produced locally)

• Utility electricity buyback (per kW produced on demand)

• Retail wheeling income (per kW produced)

• Retail wheeling income (per kW produced on demand)

The cost function is the sum of the listed cost components.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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