Wide-load main steam pressure control method for cogeneration unit

The invention discloses a wide-load main steam pressure control method for a cogeneration unit. The method comprises the following steps: dynamically regulating the fuel demand of a boiler side by virtue of an engine and boiler energy balancing algorithm; fitting a sliding pressure operation curve of the unit and a heating fuel reference value according to an AGC load assessment signal of the cogeneration unit and different heat-electricity ratio and wide-load operation conditions; fitting a steam drum pressure curve by adopting a load feed-forward technology, and judging the fuel demand of the boiler side in the future in advance. According to the method, the regulation quality of a regulation system under a high-heat-electricity ratio and wide-load operation condition is optimized. 本发明公开了种热电联产机组宽负荷主蒸汽压力控制方法，该方法包括：利用机炉能量平衡算法动态调整锅炉侧燃料需求量；根据热电联机组的AGC负荷评估信号，按照不同的热电比和宽负荷运行工况拟合出机组滑压运行曲线和供热燃料基准值；采用负荷前馈技术拟合出汽包压力曲线，提前预判未来锅炉侧燃料需求量。该方法实现优化调节系统在大热电比和宽负荷运行工况下的调节品质。