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为解决传统直热式空气源热泵供水系统所存在的温度控制精度较差及调节耗时长、控温效果达不到要求等问题,提出了一种基于数字PID(proportion,integral,derivative)的优化温控算法.温度是一个非线性、大时变和大滞后的被控对象,针对这种具有大滞后、非线性特性的被控对象,该算法基于传统数字式PID控制算法,针对温度初始上升阶段的缓慢特性,加入了首次阀门开度设定;针对目标温度超调量大特点,加入了温度斜率跟踪;针对寒冷地区系统加热缓慢的特点,加入了阀门位置跟踪控制.运行结果显示该算法能使系统快速、稳定地达到用户设定的出水温度,并且具有结构简单、精度高的特点,具有一定的实用价值.
In order to solve the problems such as poor precision of temperature control, long time-consuming regulation and poor control effect of temperature in traditional direct-flow air-source heat pump water supply system, an optimization based on PID (Proportional, Integral, Derivative) Temperature control algorithm.Temperature is a non-linear, large time-varying and large-delay controlled object.Aiming at the controlled object with large delay and non-linearity, this algorithm is based on the traditional digital PID control algorithm, The slowness of the stage, adding the first valve opening setting; for the target temperature overshoot large features, adding the temperature slope tracking; for the slow heating system in cold regions, joined the valve position tracking control. The results show that the algorithm The system can quickly and stably achieve the water temperature set by the user, and has the advantages of simple structure and high precision, and has certain practical value.