多变量极值搜索控制在跨临界CO2中间过冷补气热泵系统中的应用  

Application of the Multi-Variable Extreme Seeking Control to the Efficient Operation of the Sub-Cooler Vapor Injection Transcritical CO2 Heat Pumps

作　　者：崔策 宋昱龙 殷翔[1] 曹锋[1] CUI Ce;SONG Yulong;YIN Xiang;CAO Feng(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2020年第12期131-137,共7页Journal of Xi'an Jiaotong University

基　　金：国家科技重大专项资助项目(2017-Ⅲ-0010-0036);国家自然科学基金资助项目(51976153)。

摘　　要：为了将跨临界CO 2中间补气过冷热泵热水器的实时能耗控制在最低水平,将多变量极值搜索算法运用到跨临界CO 2中间补气过冷系统的控制方案,将系统功耗设定为目标优化量,跨临界CO 2系统的排气压力和中间压力设定为控制量。采用仿真软件Dymola(Modelica 3.2.3)和模型库ThermalSystems(TLK-thermo、GmbH)搭建了跨临界CO 2中间过冷补气热泵热水器和相应控制系统的动态模型,在环境温度-12℃,进、出水温度为45℃、65℃工况下,给定系统初始状态点为排气压力12 MPa、中间压力7 MPa,经过极值搜索控制器作用后,排气压力与中间压力稳定控制在能够实现系统最低能耗的最优参数下,验证了该控制方案的有效性。为了验证该系统的可靠性,模拟过程中极值搜索系统在排气压力和中间压力的运行初值分别为10、6 MPa,10、8 MPa,14、6 MPa,14、8 MPa的情况下,系统均能到达并收敛到最低能耗点。The extreme seeking control(ESC)algorithm is utilized to realize the real-time minimization of the power consumption of the sub-cooler vapor injection transcritical CO2 heat pump water heater system.The ESC takes the power consumption as the feedback,and the manipulated inputs are the discharge pressure and the medium pressure.A dynamic simulation model based on Dymold(Modelica 3.2.3)and ThermSystems(TLK-thermo,GmbH)is developed for a sub-cooler vapor injection transcritical CO2 heat pumps to evaluate the proposed multi-variable ESC method under the design condition.Given the initial state of the system with discharge pressure and medium pressure at 12 and 7 MPa,environmental temperature at-12℃,inlet and outlet water temperature at 45 and 65℃,both the discharge pressure and the medium pressure converge to the optimal operation parameters under the manipulation of the ESC controller.This study also simulates the operation results of the ESC at four different initial states(discharge pressure and medium pressure at 10 and 6 MPa,10 and 8 MPa,14 and 6 MPa and 14 and 8 MPa,respectively).The system can reach and converge to the lowest power consumption point of the system,and the reliability of the method is verified.

关 键 词：中间补气 二氧化碳 极值搜索控制 

分 类 号：TB657[一般工业技术—制冷工程]