Research on the Application of Multi-model Predictive Control in Coordinated Control of 1,000 MW Ultra-supercritical Unit

In this paper, an ultra-supercritical unit coordinated control strategy based on multi-model predictive control is proposed in light of the nonlinear characteristics of the ultra-supercritical unit. The strategy utilizes the nonlinear process (linear uncertain process) at multiple working points to divide the target workspace into several subspaces, a relatively accurate fixed model can be found in each subspace. Based on this, a global approximation model of complex object could be constructed as the predictive model by using weighted sub model. Then the output of predictive controller is calculated with linear or nonlinear optimization method. According to the simulation and application results, the control strategy as well as the algorithm is proved to be effective.

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