Preprint Article Version 1 NOT YET PEER-REVIEWED

A Switching Control Strategy of Greenhouse Temperature-Humidity System based on Prediction Model

  1. School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
Version 1 : Received: 7 November 2016 / Approved: 7 November 2016 / Online: 7 November 2016 (08:40:53 CET)

How to cite: Xu, Z.; Chen, J. A Switching Control Strategy of Greenhouse Temperature-Humidity System based on Prediction Model. Preprints 2016, 2016110044 (doi: 10.20944/preprints201611.0044.v1). Xu, Z.; Chen, J. A Switching Control Strategy of Greenhouse Temperature-Humidity System based on Prediction Model. Preprints 2016, 2016110044 (doi: 10.20944/preprints201611.0044.v1).

Abstract

It’s difficult to achieve the coordination control of multiple facilities which are driven by the on-off actuators in greenhouse, especially when more than one indoor environmental factor needs to be considered together. We proposed a switching control strategy based on prediction model, with the consideration of indoor air temperature and relative humidity. At first, the operation of greenhouse system was divided into several modes according to the on-off control characteristic of facilities. Then for each current mode, the operating modes which the greenhouse is likely to enter into at the next moment are listed in different conditions of indoor air temperature and humidity. When the two indoor environmental factors reach the upper or lower limits, we use the IARX models to predict them over a specified horizon for each optional mode respectively. The mode switch is achieved based on the prediction results. The simulation results show that the facilities can be controlled coordinately very well and the proposed control strategy is easy to implement. The control strategy is still applicative when there are more facilities or more indoor environmental factors needed to be taken into account.

Subject Areas

agricultural greenhouse; switching control; hybrid system; prediction model

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