涡旋膨胀机发电系统效率优化控制策略

Efficiency Optimization Control Strategy of Scroll Expander Generator System

提出了以最小压缩气体消耗为涡旋膨胀机发电系统效率优化的目标,采用了基于系统损耗模型优化和在线搜索相结合的转速寻优策略,有效避免寻优初值的随机性及参数变化对优化结果的影响。针对气动系统非线性、滞后性及负载不确定性所致的发电系统强非线性的特点,采用了供气压力反馈线性化的补偿控制和PI速度控制相结合的控制策略,对优化速度快速无静差跟踪。试验结果表明,控制策略可实现速度的快速寻优以及优化速度的快速跟踪,实现了减小压缩气体消耗的目标。

The minimum air consumption as the efficiency optimization target for scroll expander generator system is first proposed and the optimization method combining the loss model method with the online search method is adoptd in this paper, which is profitable to avoid the adverse effect caused by the randomness of initialization and the change of conditions. In view of the nonlinearity characteristic of the power generation system due to nonlinearity the pneumatic system and randomness of load, the control strategy combining compensation control based on supply pressure feedback linearization and speed PI tracking control is used. It is effective to compensate for nonlinearity of supply pressure and tracking without steady-state error of optimal speed. The experimental results indicate that the optimal control strategy is effective for speed optimization and tracking, and the goal of minimum air consumption can be achievd.