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The hierarchical control structure, namely, primary, secondary and tertiary control, becomes the standard operation of islanded microgrid. However, due to the proliferation of renewable energy sources which fluctuate fast, the time scale separation of the secondary and tertiary control can make the operation of microgrid becomes less economic efficient. Therefore, we incorporate the economic dispatch...
Real time optimization (RTO) is widely used in the refinery industries. Fluid catalytic cracking (FCC) process is one of the most complex processes in petrochemical refinery. Due to complex reactions in FCC, the mathematical model of the FCC can't describe the plant perfectly. The RTO strategy based on mismatch model will lead to sub-optimal results. Modifier-adaptation (MA) method is a new strategy...
In industrial process field, the integrations of model predictive control (MPC) and hierarchical control system are widely used. A new double-layered model predictive control strategy with dynamic trajectory calculation (DTC) in its upper layer is presented in this paper, which can be applied in the midst of a hierarchical control system. DTC includes a feasibility stage with prioritized constraints...
In this paper, an improved LQG benchmark for the economic performance assessment of model predictive control system is presented. The LQG benchmark is obtained by a regression of a series of discrete points calculated through solving LQG problem. The discrete points obtained by traditional method present an unbalanced distribution, thus leading to an unsatisfied regression curve especially at the...
Shadow prices show the effect, which were caused by variations of constrained boundaries, to optimum value of objective function under the current optimal strategy. In this paper, a LP-MPC form of two-layered predictive control was described, and a constraint tuning strategy based on shadow price was proposed under this structure. The nature of disturbance can be evaluated according to the history...
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