基于催化裂化装置稳定汽油蒸气压的在线软测量模型，使用扩展状态空间预测控制算法，设计了蒸气压的预测—PID串级控制系统，并在TD3000集散控制系统中实现，取得了良好的运行效果。 Based on the on-line soft sensor model of stabilized gasoline vapor pressure in catalytic cracking unit, an extended state space prediction control algorithm was used to design a vapor pressure prediction-PID cascade control system, which was implemented in the TD3000 distributed control system and achieved good operating results .