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수경 작물 재배 시스템의 양액 조제에 영향을 미치는 요인 식별
밀론초두리 ( Milon Chowdhury ),카말라술 ( Kamal Rasool ),모하마드알리 ( Mohammod Ali ),나딘알리칸 ( Nadeen Ali Khan ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.1
Automatic target hydroponic solution preparation is still a critical issue as several factors affect this process. The objective of this study was to identify the major factors affecting the target nutrient solution preparation, in terms of nutrient mixing method, coefficients identification, and stock solutions supply rate, for hydroponic crop cultivation. A hydroponic nutrient solution preparation test bench was fabricated, which consisted of sensors, tanks, pumps, pipes, and a controller. Two control methods, on/off and PID, were implemented and coefficients of the relevant control methods, dead-band for the on/off, and Kp, Ki, Kd for the PID method, were identified through mathematical simulations. Validation tests were performed to select the suitable control method along with their coefficients based on the response time and steady-state error. Effects of different stock solution supply rates (0.03, 0.05, and 0.1 Lmin-1) on the control methods were also evaluated. In the on/off and PID control method, the target ion concentration was maintained with the errors of 22.15% and -1.241%, respectively. Considering 2% dead-band for on/off method, and tuning the PID coefficient, the steady-state error reduced to 1.175% and -0.398%, respectively. In the case of on/off control, duration of oscillation and overshoot volume were increased with stock solutions supply rate. In the PID control, the low supply rate (0.03 Lmin-1) showed the minimum steady-state error (-0.402%), but took a long time to reach steady (364s). The Rising time for the high supply rate (0.1 Lmin-1) was short (89s), but the steady-state error was high (-1.363%). The results indicate that the nutrient mixing method, relevant coefficient/s identification, and supply rate of the stock solutions need to be adjusted system-specifically.
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