Design of a hybrid active disturbance rejection control based on probabilistic robustness

doi:10.3969/j.issn.2097-0706.2022.10.008

Abstract

Abstract:

Superheated steam temperature （SST） is a vital parameter for the daily operation of a coal-fired power unit because it is related to the efficiency and the safety of the unit. Due to SST's characteristics of large inertia and delay， cascade control strategies are usually applied to the control of the parameter. However， the structures of cascade control systems are complex， which brings challenges to the tuning of controllers. A hybrid active disturbance rejection controller （HADRC） can simplify the control structure of SST and perform satisfying control. Nevertheless， uncertainties caused by the access of renewable energy systems exist. The original HADRC designed based on the nominal system is unable to handle with uncertainties effectively. To meet the control requirements under variable working conditions with maximum probability，a HADRC is designed based on the stochastic analysis method—probabilistic robustness（PR）. Simulation results illustrate that the PR-based HADRC is of fast dynamic performance and strong robustness， which shows its promising prospect in future applications to coal-fired power units.

Key words: coal-fired power unit, superheated steam temperature, probabilistic robustness, active disturbance rejection control, uncertainty, stochastic analysis, renewable energy

CLC Number:

TM921.5：TK39

SHI Gengjin, LI Donghai, DING Yanjun. Design of a hybrid active disturbance rejection control based on probabilistic robustness[J]. Integrated Intelligent Energy, 2022, 44(10): 57-64.

Figures/Tables 11

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控制策略	σ/%	t_s/s	J_sp	J_ud1	J_ud2
OPI-PI	13.6	2 900	680.9	329.6	656.3
IPI-PI	0	1 122	336.5	92.4	350.0
ADRC-PI	1.3	700	344.2	92.2	292.9
MADRC-PI	1.0	578	260.6	82.8	238.8
HADRC	0.2	424	215.1	41.6	202.9
PR-HADRC	0.2	299	153.5	8.5	114.0

控制策略	概率估计值
OPI-PI	0.081 6
IPI-PI	0.231 6
ADRC-PI	0.180 0
MADRC-PI	0.249 6
HADRC	0.427 2
PR-HADRC	0.909 2