| Based on the operation of new Hanfeng power plant in the southern grid of Hebei province, the stability influence on the power system of the large capacity generator units'shutting down is analyzed in this paper, and the solution scheme is presented, which is verified in the expriments:(1) While 660MW unit is shutting down in the southern grid of Hebei province at present day, the influence on the frequency and link-line tide is analyzed and calculated. Then, the measures of eliminating the bad influence on the grid are analyzed, furthermore, the first-frequency adjustment of the generator units is presented to regulate the tide on the link-line, which is assumed to keep the grid in stable operation.(2) According to the principles of first-frequency adjustment of grid and generator, the methods mentioned above are practical. Based on the bad influence on the frequency and tide while 660MW unit is shut down, the parameters of DEH units are calculated, after that, the suitable parameters are selected finally.After the first-frequency adjustment of the units, the control-systems are of normal operation, the units'pressure, the water levels in the steam drum and the pressure in the hearth are stable, which are not harmful to the safe operation of the generator units. Most of the units adjustments meet the requirement basically, the methods presented in this paper can be a measure to ameliorate the quality of power supplement and to keep the safe operation of grid. |
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