An advanced temperature and humidity control method applied to greenhouses
An advanced control and greenhouse technology, applied in the direction of non-electric variable control, control/regulation system, simultaneous control of multiple variables, etc., can solve the problem that it is difficult to ensure the control effect of the multi-input and multi-output control system, and the inability to obtain accurate control laws , regardless of the changes and influences of other factors, to achieve good operation results, simple realization form, and easy parameter setting
Inactive Publication Date: 2016-05-04
DONGHUA UNIV
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Problems solved by technology
Therefore, the temperature and humidity control of the greenhouse is difficult to achieve the purpose of closed-loop automatic control by using a simple PID control algorithm, and it is difficult to guarantee the control speed and accuracy, and it is difficult to achieve a satisfactory control effect.
[0004] The traditional greenhouse control system usually adopts single-factor control, and the control method is relatively simple, but the coupling effect between environmental factors is ignored, and the changes and influences of other factors are not considered when adjusting an environmental factor.
For example, the influence of humidity changes on temperature is not considered when controlling temperature, and generally only a single temperature adjustment mechanism is controlled, and the influence of other actuator actions on temperature is not considered. Such single-factor control is difficult to ensure multiple-input multiple-output (MIMO) coupled greenhouses Greenhouse control system has good control effect
A large number of modern greenhouse control systems use multi-factor coordinated control, using expert experience-based fuzzy control strategies, and establishing fuzzy control rules through expert experience, so as to comprehensively coordinate and control various environmental factors. It is more effective, but the control precision is not very high, it is impossible to get precise control amount and the control law lacks certain continuity
[0005] The temperature and humidity control methods of the above-mentioned greenhouses have their own limitations, and it is difficult to achieve a satisfactory control effect
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[0031] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.
[0032] combine figure 1 , image 3 and Figure 4 The invention provides an advanced temperature and humidity control method applied to a greenhouse, the steps of which are as follows:
[0033] Step 1. Establish an advanced greenhouse temperature and humidity control system, which includes a temperature prediction PI controller and a humidity prediction PI controller based on the prediction PI algorithm, a decoupling controller based on diagonal decoupling, and a greenhouse temperature and humidity process model. Given the temperature input signal SP1(t) and the humidity input signal SP2(t) that need to be reached by the greenhouse, the temperature system error Error1(t) and the humidity system error Error2(t) are calculated, Error1(t)=SP1(t)- PV1(t), Error2(t)=SP2(t)-PV2(t), PV1(t) and PV2(t) are the output temperature and outp...
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The invention relates to an advanced temperature and humidity control method applied to a greenhouse. The advanced temperature and humidity control method is characterized in that a greenhouse temperature and humidity model is established in an SIMULINK of an MATLAB, a master controller and an opposite angle decoupling controller based on a PI predicting algorithm are established in an OPTO 22, the MATLAB is connected with the OPTO 22 for communication, and therefore an opposite angle decoupling control model based on the PI predicting algorithm is formed. Based on a special object of the greenhouse, the advanced PI predicting control algorithm is adopted for designing the temperature and humidity controller, the problems that a traditional PID control algorithm is low in adjusting speed and large in fluctuation are solved, the interference-resistant performance is high, the realization form is simple, the control effect is good, and the advanced temperature and humidity control method can be applied to an actual industrial process.
Description
technical field [0001] The invention relates to an advanced temperature and humidity control method applied in a greenhouse, belonging to the technical field of process control. Background technique [0002] The main purpose of the greenhouse is to change the plant growth environment. According to the best growth conditions for crop growth, the greenhouse climate can be adjusted to meet the needs of plant growth throughout the year. It is not affected by climate and soil conditions, and can avoid changes in the four seasons of the outside world. It is a greenhouse facility that can produce a variety of different vegetables, flowers and other off-season crops on a limited land year round. [0003] Compared with other processes in the industry, the greenhouse is a typical multiple-input multiple-output (MIMO) complex nonlinear system. The distribution of various environmental factors in the greenhouse is uneven, and it has the characteristics of nonlinearity, time-varying, lar...
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IPC IPC(8): G05D27/02
Inventor 任正云谭志君陈一志冯琪郭朝伟李娜
Owner DONGHUA UNIV