Application and Composition of Active Disturbance Rejection Controller in Artificial Climate Chamber

Application and Composition of Active Disturbance Rejection Controller in Artificial Climate Chamber

Artificial climate chamber is suitable for scientific research units such as health and epidemic prevention, environmental protection, agriculture, forestry, animal husbandry, and other research institutes, colleges and universities laboratories, production departments as a special constant temperature and humidity, lighting equipment for the cultivation and preservation of molds, bacteria and microorganisms, plant cultivation, breeding experiments. Accurately simulate the climatic conditions of different environments. In computer-aided agricultural production, artificial climate incubator is one of the effective tools for agricultural scientific research. It is a high-precision hot and cold temperature equipment with light and humidification capabilities, providing users with an ideal artificial climate experimental environment. Because artificial climate chambers control the temperature and humidity of the objects, and the quality and quantity of the objects placed therein are unpredictable, the control objects are characterized by large delay, large inertia, and uncertainty. Since the classical and modern control theory relies to a large extent on structurally known mathematical models of the system, and the modern control theory is strictly established on the premise of the mathematical model of the controlled object, the accuracy of the control algorithm for the controlled object is very high. High, no suitable algorithm to implement an advanced control scheme will undoubtedly be very difficult. ADRC technology is a new integrated control method for control systems developed to meet the needs of digital control. The controller designed with this technology has the characteristics of small overshoot, fast convergence, high precision, strong anti-interference ability, and simple algorithm. ADRC uses a nonlinear structure to fundamentally overcome the inherent deficiencies of the classic PID, can effectively solve the problems of model uncertainty, multi-perturbation, and time delay of the control object. The basic idea and method of ADRC are very large compared with the traditional controller. Breakthrough.

Artificial climate cabinets need to control the temperature, humidity, and light levels in the cabinet. Illumination is achieved through a variety of fluorescent lighting, the control of which is controlled by switches, which is simple to implement. The core issues are the accuracy of temperature and humidity control and the response speed. And because it can effectively control the temperature, humidity and light intensity, it is sometimes called smart artificial climate box. The integrated temperature sensor AD590KH has a temperature measurement accuracy of 0.1°C, a temperature measurement resolution of 0.01°C, and a non-linearity of less than 0.5% in the 0 to 150°C range. The parameter performance guarantees that the heat source data collected in the scene is converted into a voltage signal. The data accuracy, stability, and linearity are all higher than the measurement standards. The humidity sensor uses a linear voltage output type integrated humidity sensor HM1500. Its main feature is the use of constant voltage power supply, built-in amplifier circuit, can output volt-level voltage signals proportional to relative humidity, fast response, good repeatability, anti-pollution ability.