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A multi-factor coordinated multi-objective control method for greenhouse environment

A control method and technology of environmental factors, applied in greenhouse cultivation, control/regulation system, non-electric variable control, etc., can solve problems such as multi-actuator conflict

Active Publication Date: 2020-11-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a control method seems simple, but the environmental state of the greenhouse is seriously coupled, and one actuator will have a two-way effect on temperature and humidity at the same time, and there will be conflicts between multiple actuators

Method used

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  • A multi-factor coordinated multi-objective control method for greenhouse environment
  • A multi-factor coordinated multi-objective control method for greenhouse environment
  • A multi-factor coordinated multi-objective control method for greenhouse environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] 1. Heating control:

[0110] 1) Divide the day into N intervals, and manually set the initial heating temperature Ht i [°C](0≤i<N);

[0111] 2) Correct the heating temperature Ht=Ht according to the influence factor i +ΔHt Hum +ΔHt Rad +ΔHt Radsum +ΔHt TOut ;

[0112] 3) Determine the upper and lower limits of the temperature threshold Ht+δ h , Ht-δ l ;

[0113] 4) When the indoor temperature t in l , heating starts U heat = 100%. when t in >Ht+δ h , heating off U heat = 0%. when t in ∈[Ht-δ l ,Ht+δ h ], the state of the heating equipment remains unchanged;

[0114] In step 2), the indoor humidity correction ΔHt Hum , the instantaneous light correction ΔHt Rad , cumulative light correction ΔHt RadSum , Outdoor temperature correction ΔHt TOut The calculation follows the following formula. The corresponding independent variables x are: indoor relative humidity h in [%], light R Sun [w / m 2 ], cumulative light R Sunsum [J / cm 2 ], outdoor tempera...

Embodiment 2

[0122] 2. Sunroof side window control

[0123] 1) Divide the time of the day into N intervals, and manually set the initial ventilation temperature Vt i [°C](0≤i

[0124] 2) Correct the ventilation temperature Vt=Vt according to the influence factor i +ΔVt Rad +ΔVt RadSum +ΔVt Hum ;

[0125] 3) Calculate the temperature zone T according to the outdoor temperature correction and the outdoor wind speed correction b =T b0 +ΔT bTOut +ΔT bWind ;

[0126] 4) According to the temperature band T b and ventilation temperature Vt and indoor temperature t in , calculate the skylight opening U Roof [%];

[0127] 5) If it is a greenhouse with north-south skylights, calculate the windward and windward opening U according to the wind direction Lee , U Wind ;

[0128] 6) Calculate the side window opening U based on the ventilation temperature Vt and the set delay temperature side [%].

[0129] For step 2) ventilation temperature influence factor, instantaneous light corr...

Embodiment 3

[0142] 3. Wet curtain fan control

[0143] 1) Set the time period for the wet curtain fan to be allowed to start (eg: 9:00–16:00);

[0144] 2) According to the temperature setting value T of the wet curtain fan fan , temperature band T b , Calculate fan power U Fan .

[0145] In step 2), calculate fan power as Figure 12 Shown, T b The temperature zone calculated for step 3), T fan It is an artificial setting value, and it is recommended to set it as the upper limit of the suitable temperature for crop growth (such as T fan =31℃), when t≤T fan ,U fan =0%, when t≥T fan +T b , U fan =100%, when t∈(T fan , T fan +T b ), U fan =(t-T fan ) / T b ×100%. Then according to the indoor humidity h in and set the humidity threshold H set , to judge whether the wet curtain can be opened, in U Fan >0, when h in set When -δ, the wet curtain is allowed to open, when h in >H set +δ, the wet curtain is forced to close.

[0146] Suppose the temperature band T b =0.5℃, set...

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Abstract

The invention relates to a multi-factor coordinated multi-target control method for a greenhouse environment. The method comprises following steps of (1) constructing a greenhouse environment multi-factor coordinated multi-target control mode qualitatively; and (2) setting independent control manners for execution mechanisms of the greenhouse separately, controlling each execution mechanism with an environment factor as a threshold, and correcting the threshold with the help of a secondary environment factor, so as to realize greenhouse environment control. Compared with the prior art, the method has advantages of considering coupling of multiple factors, having high applicability, having simple logic and being easy to realize.

Description

technical field [0001] The invention relates to the technical field of environmental control of agricultural facilities, in particular to a multi-factor coordinated multi-objective control method for a greenhouse environment. Background technique [0002] Greenhouse environment control is a necessary part of the modern greenhouse production process. The modern greenhouse computer system detects and stores real-time data (temperature, humidity, light, wind speed, etc.) Heating mechanism, sunshade net, skylight, side window, heat preservation net, wet curtain fan, etc.), realize the control of the microclimate inside the greenhouse, and create a suitable growth environment for crops. Thereby reducing labor costs and improving crop yield and quality. Among them, to realize the automatic control of the greenhouse, the core is the control method. [0003] China's rural areas, especially urban agriculture, have a high demand for automation. The rural population is constantly de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D27/02A01G9/14
CPCA01G9/14G05D27/02Y02A40/25
Inventor 徐立鸿蔚瑞华陈示捷
Owner TONGJI UNIV
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