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Aiming at the disadvantage of system efficiency, a novel control strategy of maximizing energy saving while meeting the cooling demand for vapor compression refrigeration cycle (VCC) is presented. The VCC system is a core element in heating, ventilating, and air-conditioning (HVAC) system, and its coefficient of performance (COP), a measure of system efficiency for VCC system, is strongly influenced...
This paper presents an improved method of model parameters identification in frequency-domain for closed-loop multivariable processes. Based on reference input and process output data during the closed-loop sequence step tests, the process frequency-responses are estimated with signal frequency analysis. Using a min-max critical frequency search algorithm, only a least possible number of frequency...
This paper dedicates to developing a unified framework for control structure selection for multi-input multi-output (MIMO) processes. Five basic types of MIMO PID control structure are abstracted including decentralized control, sparse control, and decoupling control with/without decoupling compensator. Based on a novel interaction index calculated via relative normalized gain, loop interactions are...
Stable control of a coal-pulverizing system with ball-tube mill usually cannot be hold due to some disturbances, such as coal hardness and steel ball wearing, etc. A hierarchical structure with a direct control layer and a set-point optimization layer is applied to this typical system. Based on steady-state gain models of different operating points, a grid search method is employed to calculate optimal...
Ball mill coal pulverizing system is a multiple-input multiple-output (MIMO) process characterized with strong couplings and nonlinearities. Conventional control methods maybe work well initially, but will deviate from optimal work point for a period of time and even cease to be functionally effective. A multilayer structure with direct control and optimization is presented for the control of ball...
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