The Strategy Analysis and Practice on Improving the Load Change Performance of 1GW Ultra Supercritical Unit
The special role and the special responsibility of the local coal-fired unit in the AGC adjustment are unscrambled by the main features of Shanghai Power Grid. 1 GW ultra supercritical unit is hard to be adapted to the frequent frequency regulation in Power Grid owning to its equipment features, but the AGC adjustment is a basic obligation of power plants that have entered Power Grid. As the external condition of coal-fired power plant is hard to change in a short while, coal-fired power plant need to make a breakthrough from itself so as to adapt to the present load regulation of Power Grid. As is introduced in the paper, Shanghai Waigaoqiao No. 3 Power Plant seeks a breakthrough by the innovational thinking, which adopts the technology of frequency regulation with condensate throttling during the beginning of the commercial operation and the technology of frequency regulation with high pressure extract steam during the period of constant improving AGC performance. Distinguish methods are found by statistics on the situation of considering the large change of load and the small frequent inverted load regulation, which provide the basis for the strategy formation. And the restraint suggestion is provided for the inverse effect of primary frequency regulation when the load changes in one direction.