Robust stability of closed artificial ecosystem cultivating cabbage realized by ecological thermodynamics and dissipative structure system

The environmental disturbances often negatively influence normal operation of closed artificial ecosystems (CAE). In this paper, a specific CAE cultivating cabbage (CAECC) was considered as a dissipative structure system (DSS), its highly precise kinetic model was developed by system dynamics and experimental data. Based on ecological thermodynamics (ET) and DSS, the optimal feedback control law of light intensity, temperature and aerating rate was obtained from the stored-energy function and Odum's maximum power principle. The digital simulation results showed that the closed-loop CAECC control system could be stabilized at a prescribed working point with desired dynamic response characteristics, accompanied with conducting eco-work and dissipation of the stored energy generated by environmental disturbances with different strengths. This research will lay a theoretical and methodological basis for construction and operation of CAE.