Coordinated control system modelling of ultra-supercritical unit based on a new T-S fuzzy structure

Guolian Hou; Huan Du; Yu Yang; Congzhi Huang; Jianhua Zhang

doi:10.1016/j.isatra.2018.01.022

Coordinated control system modelling of ultra-supercritical unit based on a new T-S fuzzy structure

ISA Trans. 2018 Mar:74:120-133. doi: 10.1016/j.isatra.2018.01.022. Epub 2018 Feb 9.

Authors

Guolian Hou¹, Huan Du¹, Yu Yang², Congzhi Huang³, Jianhua Zhang¹

Affiliations

¹ School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, China.
² Nanjing NARI RELAYS Electric Co., Ltd., Nanjing 211100, China.
³ School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, China; Colleges and Universities Key Laboratory of Intelligent Integrated Automation, Guilin University of Electronic Technology, Guangxi, 541004, China. Electronic address: hcz190@ncepu.edu.cn.

PMID: 29429590
DOI: 10.1016/j.isatra.2018.01.022

Abstract

The thermal power plant, especially the ultra-supercritical unit is featured with severe nonlinearity, strong multivariable coupling. In order to deal with these difficulties, it is of great importance to build an accurate and simple model of the coordinated control system (CCS) in the ultra-supercritical unit. In this paper, an improved T-S fuzzy model identification approach is proposed. First of all, the k-means++ algorithm is employed to identify the premise parameters so as to guarantee the number of fuzzy rules. Then, the local linearized models are determined by using the incremental historical data around the cluster centers, which are obtained via the stochastic gradient descent algorithm with momentum and variable learning rate. Finally, with the proposed method, the CCS model of a 1000 MW USC unit in Tai Zhou power plant is developed. The effectiveness of the proposed approach is validated by the given extensive simulation results, and it can be further employed to design the overall advanced controllers for the CCS in an USC unit.

Keywords: Coordinated control system; Stochastic gradient; T-S fuzzy model; Ultra-supercritical unit; k-means++.