干旱区生态环境知识资源中心

This paper present a photovoltaic energy application which consist on supplying electricity power to a greenhouse cooling system. It aims to reduce the agriculture production cost and to be an alternative of the absence of electricity specially in arid zone. The photovoltaic generator PVG is controlled via Maximum Power Point Tracking MPPT and the cooling system, modeled as an induction machine, is controlled via a direct torque control DTC mode. The greenhouse is a thermodynamic complex system where a multiple of factors interaction affect the interior climate evolution which make the prediction of the internal climate status more difficult. A dynamic model of the greenhouse was developed to simulate the thermodynamic response for external meteorological conditions. In this paper we will focus on the control of the internal temperature of the greenhouse. When the inside temperature exceed the set point, the fans are activated to refresh the inside air.