4612System Stability Requirements

System stability requirements are focused on keeping a reliable operating power system. This includes the need for voltage and voltampere-reactive (VAR) support as well as that for over- and underfrequency protection.

If the source of generation is not able to inherently provide the required levels of power factor, between 90% lagging and 95% leading as measured at the customer meter, some means of improving the power factor may be required, such as power factor correction capacitors. The means of power factor correction should be at the discretion of the owner/operator of the distributed generation.

For generators that will operate in parallel to the utility power system, the total harmonic distortion (THD) voltage must not exceed 5% as measured at the generator's terminals when the generator is not paralleled with the utility system. TheTHD at the point of common coupling needs to conform to IEEE 519 -1992 and is limited to 5% by P.U.C. SUBST. R. 25.51, relating to Power Quality. (See ยง25.51(c) relating to harmonics.)

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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