Practical disturbance rejection control for boiler-turbine unit with input constraints

Abstract With the increase of renewable sources participating into the power grid, the traditional thermal power generation is responsible for the frequent power regulation where the disturbance rejection ability should be enhanced during the operation. The boiler-turbine unit is a non-strictly proper multivariable plant with uncertainties, external disturbances and hard constraints, which make the conventional control strategy hard to meet the operating requirement. To this end, an advanced control strategy of generalized active disturbance rejection control (GADRC) is proposed in this paper, consisting of multivariable extended state observer (MESO) and anti-windup compensator. A simple transformation approach is proposed, which can convert the output disturbances involving the feedthrough item into the input lumped disturbances, so that their impact can be estimated by the MESO and compensated by the proposed GADRC. In addition to this, a setpoint filter is developed in the control structure to remove the tracking offset caused by the unknown disturbances and a novel anti-windup strategy is presented to handle the input saturation problem and alleviate the resulting fuel waste issue. The robust stabilities of the proposed GADRC including feedback control and anti-windup control are guaranteed using frequency domain method and Circle criterion, respectively. Simulation studies compared with other methods demonstrate the effectiveness of the proposed control strategy on the boiler-turbine unit, especially in complex cases of external disturbance and model-plant mismatches.

[1]  Masayoshi Tomizuka,et al.  LMI-BASED SYNTHESIS OF ANTI-WINDUP FILTERS WITH POLE CONSTRAINTS , 2005 .

[2]  Manfred Morari,et al.  Multivariable anti-windup controller synthesis using linear matrix inequalities , 2001, Autom..

[3]  Jun Yang,et al.  Generalized Extended State Observer Based Control for Systems With Mismatched Uncertainties , 2012, IEEE Transactions on Industrial Electronics.

[4]  Yuanqing Xia,et al.  Active disturbance rejection control for uncertain multivariable systems with time-delay , 2007 .

[5]  Kwang Y. Lee,et al.  A Practical Multivariable Control Approach Based on Inverted Decoupling and Decentralized Active Disturbance Rejection Control , 2016 .

[6]  Mikhail Svinin,et al.  Extended state observer based technique for control of robot systems , 2002, Proceedings of the 4th World Congress on Intelligent Control and Automation (Cat. No.02EX527).

[7]  Meihong Wang,et al.  Reinforced coordinated control of coal-fired power plant retrofitted with solvent based CO2 capture using model predictive controls , 2019, Applied Energy.

[8]  Jun Yang,et al.  Nonlinear disturbance observer-based control for multi-input multi-output nonlinear systems subject to mismatching condition , 2012, Int. J. Control.

[9]  Luca Zaccarian,et al.  Constructive nonlinear anti-windup design for exponentially unstable linear plants , 2004, 2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601).

[10]  Andrew G. Alleyne,et al.  Model predictive control of hybrid thermal energy systems in transport refrigeration , 2015 .

[11]  Juraj Oravec,et al.  Robust controller design for a laboratory heat exchanger , 2018 .

[12]  Fuzhen Zhang.  The Schur complement and its applications , 2005 .

[13]  Wen Tan,et al.  Tuning of PID controllers for boiler-turbine units. , 2004, ISA transactions.

[14]  Jingqing Han,et al.  From PID to Active Disturbance Rejection Control , 2009, IEEE Trans. Ind. Electron..

[15]  Jun Yang,et al.  Disturbance Observer-Based Control: Methods and Applications , 2014 .

[16]  I. Postlethwaite,et al.  A new perspective on static and low order anti-windup synthesis , 2004 .

[17]  Suhada Jayasuriya,et al.  An Internal Model Control Anti-Windup Scheme With Improved Performance for Input Saturation Via Loop Shaping , 2010 .

[18]  Jeff S. Shamma,et al.  Gain-scheduled ℓ1-optimal control for boiler-turbine dynamics with actuator saturation , 2004 .

[19]  Xiao Wu,et al.  Data-Driven Modeling and Predictive Control for Boiler–Turbine Unit , 2013 .

[20]  Xiao Wu,et al.  Hierarchical optimization of boiler–turbine unit using fuzzy stable model predictive control , 2014 .

[21]  Wen Tan,et al.  Tuning of linear ADRC with known plant information. , 2016, ISA transactions.

[22]  Graham C. Goodwin,et al.  Robust Output-Feedback MPC With Integral Action , 2010, IEEE Transactions on Automatic Control.

[23]  Bor-Sen Chen,et al.  Mixed H2/H∞ fuzzy output feedback control design for nonlinear dynamic systems: an LMI approach , 2000, IEEE Trans. Fuzzy Syst..

[24]  Michal Kvasnica,et al.  Control of a boiler-turbine unit using MPC-based reference governors , 2017 .

[25]  Ma Liangyu,et al.  Active disturbance rejection control of once-through boiler unit coordinated system based on pseudo-diagonalization , 2015, 2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE).

[26]  Mignon Park,et al.  Generalized Extended State Observer Approach to Robust Tracking Control for Wheeled Mobile Robot with Skidding and Slipping , 2013 .

[27]  Xiao Wu,et al.  Stable model predictive control based on TS fuzzy model with application to boiler-turbine coordinated system , 2011, IEEE Conference on Decision and Control and European Control Conference.

[28]  Manfred Morari,et al.  Multiplier theory for stability analysis of anti-windup control systems , 1999, Autom..

[29]  P. Daoutidis,et al.  An observer-based anti-windup scheme for non-linear systems with input constraints , 1999 .

[30]  Bo Li,et al.  Extended State Observer based robust attitude control of spacecraft with input saturation , 2016 .

[31]  Jiong Shen,et al.  Extended state observer based fuzzy model predictive control for ultra-supercritical boiler-turbine unit , 2017 .

[32]  Zongxia Jiao,et al.  Adaptive Robust Control of DC Motors With Extended State Observer , 2014, IEEE Transactions on Industrial Electronics.

[33]  M. Saif,et al.  Unknown input observer design for a class of nonlinear systems: an LMI approach , 2006, American Control Conference.

[34]  Matthew C. Turner,et al.  A nonlinear modification for improving dynamic anti-windup compensation , 2018, Eur. J. Control.

[35]  Karl Johan Åström,et al.  Drum-boiler dynamics , 2000, Autom..

[36]  Ian Postlethwaite,et al.  Multivariable Feedback Control: Analysis and Design , 1996 .

[37]  Meihong Wang,et al.  Flexible operation of post-combustion solvent-based carbon capture for coal-fired power plants using multi-model predictive control: A simulation study , 2018 .

[38]  Sofiane Ahmed Ali,et al.  Sliding Mode Control for Diesel Engine Air Path Subject to Matched and Unmatched Disturbances Using Extended State Observer , 2013 .

[39]  J. Sternby,et al.  Generalisation of conditioning technique for anti-windup compensators , 1992 .