De-Synchronization of the Distributed Refrigeration System
The supermarket refrigeration system typically has a distributed control structure, which simple and flexible, however, neglects interactions between its subsystems. Practice shows that these interactions lead to a synchronous operation of the display cases. It causes excessive wear on the compressors and increased energy consumption. The paper focuses on the synchronization analysis and de-synchronization control. The supermarket refrigeration system is modeled as a piecewise-affine switched system. The system behavior is decomposed such that synchronization analysis can be completed by using the Poincare map. A new de-synchronization scheme is proposed, which includes two steps: the synchronization monitoring and the de-synchronization control. Thus, the early warning of the synchronization can be given and then the de-synchronization controller can be activated. The scheme achieves better control performance and can deal with the large scale refrigeration system with different system parameters in the display cases.
Liangchi Zhang, Chunliang Zhang and Tielin Shi
L. Chen and R. Wisniewski, "De-Synchronization of the Distributed Refrigeration System", Advanced Materials Research, Vols. 139-141, pp. 2221-2224, 2010