Research on partition control of direct air-cooling condenser based on multivariable Hammerstein CARMA model predictive control

Partition control of the fan array within a direct air-cooling condenser (DACC) is recognized as a highly effective energy-saving measure and a means to mitigate the adverse effects of ambient winds. This study focuses on the development of a dynamic partition model, which establishes the relationship between mass flow rate and fan array speed under windy conditions. The model is grounded in multivariable Hammerstein controlled autoregressive moving average (H-CARMA) systems. Additionally, an innovative extended stochastic gradient algorithm, founded on the hierarchical identification principle, is introduced to estimate the model's unknown parameters. The recursive least square is employed as a benchmark to verify the accuracy and efficiency of the approach. Subsequently, leveraging the identified model, the model predictive controller based on the differential evolution method is designed to derive the optimal control law. Finally, simulation test and analysis are carried out to testify the effectiveness of our control strategy. The experiment result shows that the dynamic characteristics of the system have been significantly improved and the fan power consumption is reduced by 3.5% compared to the PID controller. A non-linear dynamic model with a partitioned structure of direct air-cooling condenser, which is represented by the multivariable Hammerstein model, is proposed. A novel model predictive control based on the differential evolution method is designed to obtain the optimal control law.image