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为了研究回热器带来的制冷系统吸气过热度（SSH）不稳定问题，本文采用系统仿真和样机测试方法，研究了回热器带来的系统特性变化，分析了回热器对系统SSH控制稳定性的影响。结果表明：回热器的引入，使SSH对膨胀阀开度变化的响应幅值增加，响应速度变慢。当环境温度为2℃时，回热器打开后，过热度对膨胀阀开度的阶跃响应幅值从0.96℃增至1.99℃，上升时间从33.4 s增至46.4 s。导致SSH控制回路的稳定裕度降低，更容易引发控制不稳定。通过减小SSH控制回路的比例-积分-微分（PID）参数，可以有效改善回热器系统的SSH控制稳定性。将SSH控制的PID参数各降低50%，当环境温度为2℃时，过热度偏离目标值±3℃以上的振荡时间从原来的12 min缩短至3 min以内。测试结果还进一步验证了新控制参数在不同工况下的适用性。
Abstract：To investigate the instability issue of suction superheat(SSH) control caused by regenerator, the effect of regenerator on system operating characteristics and SSH control stability by dynamic simulation and prototype test is analyzed. It has been found that refrigerant system configured with regenerator delivers higher SSH gain and slower response speed towards the same expansion valve opening change. At 2℃ ambient temperature, the static gain of SSH to the step change of expansion valve opening increases from 0.96℃ to 1.99℃, and the rising time extends from 33.4 s to 46.4 s when regenerator is configured, which is further leads to less stability margin for the system configured with regenerator. To solve the instability issue caused by regenerator, it has been demonstrated that smaller proportion integration differentiation(PID) parameters in SSH control loop greatly improved the SSH control stability. Prototype test shows that the duration of SSH instability where the oscillation amplitude is higher than 3℃ can be shortened from 12 min to 3 min by reducing the PID parameters by 50%. The applicability of the proposed PID parameters over the operating map is further validated by test.
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中图分类号:TB657
引用信息:
[1]张子杨.回热器对制冷系统过热度控制稳定性的影响分析[J].制冷技术,2025,45(03):69-74+91.
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