天然工质CO2的应用对我国强温室效应气体减排、应对国际合约具有重要意义。跨临界CO2循环最优运行状态复杂多变，实时寻优控制是保障全局最优运行的关键技术，然而其存在的热力学振荡问题会造成系统运行可靠性差、效率低。.本项目旨在解决跨临界CO2循环实时寻优的热力学振荡问题。通过建立多变量实时寻优模型和搭建实验台，明确跨临界CO2循环热力学迟滞效应在控制量扰动与表观热力学振荡特性之间的协同作用机制，揭示热力学振荡的耦合扰动诱发机理，并提出量化评价指标；构建递归扰动响应跨临界CO2循环热力学特性，解析递归扰动对热力学迟滞效应和测量反馈延迟特性的抑制衰减规律，寻找热力学振荡有效的递归扰动抑制方法；识别振荡特性的影响因素，建立参数敏感性排序和权重定量关系；以期构建全局最优运行的跨临界CO2循环实时寻优控制理论设计方法，从根本上提升跨临界CO2循环全工况综合运行效率。

The application of natural working medium CO2 is of great significance for China to reduce greenhouse gas emission and deal with international contracts. The optimal operation state of trans-critical CO2 cycle is complex and changeable, and the real-time optimal control is the key technology to ensure the global optimal operation. However, the existence of thermodynamic oscillation is a bottleneck problem restricting the engineering application, leading to the low reliability and low efficiency. .The objective of this project is to solve the thermodynamic oscillation problem during the process of real-time optimization of the transcritical CO2 cycle. A multivariable real-time optimization searching mathematical model was developed, and the corresponding experimental bench is set up. The synergistic mechanism of the thermodynamic hysteresis effect of the trans-critical CO2 cycle between the control quantity disturbance and the thermodynamic oscillation characteristics are studied. Then, the mechanism of coupled disturbance inducing oscillation is revealed and the evaluation index is put forward. In addition, a recursive perturbation dynamically following the thermodynamic properties of trans-critical CO2 is constructed. The effect of recursive perturbation on the amplitude-frequency increment of the oscillation is analyzed, which is coupled caused by the thermodynamic oscillation and feed-back delay. An effective recursive disturbance suppression method for the thermodynamic oscillation is purposed. Due to this, the influence factors of oscillation characteristics were identified and the weight quantitative relationship is established. This project aims to build a real-time optimization control theory design method for the trans-critical CO2 cycle with global optimal operation, and fundamentally improves the comprehensive operation efficiency of the whole operation condition of the trans-critical CO2 cycle.