Abstract: As a specialty goods, productionsupplydistribution of electric energy should be completed simultaneously and kept balance, otherwise the quality of electric energy, safety and stability of grid system operation would be influenced. Therefore it is necessary to regulate and control the frequency and voltage of generator units. The problems presented in largecapacity units taking responds for frequency regulation of small regional power grid were explored to provide the reference for persons in the same business.

Key words: large-capacity units, small regional power grid, frequency regulation