Application of the Main Steam Temperature Control Based on Sliding Multi-Level Multi-Model Predictive Control

摘要

With the rapid development of electric power industry technology in recent years, the main steam temperature control method for large capacity thermal power units, based on the multi-model predictive control method, has become a research hotspot. The main difficulties of the multi-mode predictive control method in the main steam temperature control application are focus on the model switching method, the resisting disturbance abilities and the impact on the control performance of the model predictive control system while the load changed lightly. The main focus of this paper is to redesign the predictive control structure of the main steam temperature system by using multi-level and multi-model structure. This article has divided the model switching area into the lagging area and the sliding switching area. The sliding switch weight values of each prediction model has also been considered and drawn into the control method. A simulation in the ideal environment with using the operation data of the real 60 MW thermal generation model has been done. By analysing the simulation results, the main steam temperature control curves have been smoother and more stable.