Robustness Enhancement of Supercritical Unit Power Control with IMC-PID Controller

doi:10.11930/j.issn.1004-9649.2016.06.020.05

Abstract

Abstract: This paper proposes a novel boiler-turbine coordinated control system in which the IMC-PID controller is adopted to tackle the power oscillation problem based on closed-loop identification in the turbine control loop. The set-point additive step disturbance is first imposed onto the closed loop to carry out frequency response characteristic identification using process inputs and outputs of the control loops. The process frequency-response matrix is then estimated, and a transform function matrix is obtained with the least square method. The robust PID controller of the turbine control loop is finally designed by using the internal model control(IMC) method based on the previously obtained model. The practical application shows that the IMC-PID controller maintains the robust performance and minimizes the effects of the external or the internal disturbances in the power plant, thus the occurrence of the power oscillation can be avoided.

Key words: thermal power generation unit, unit coordinated control, H-infinity control, closed-loop identification, IMC-PID

CLC Number:

TM621
TK323

LI Xiaofeng, WANG Yagang. Robustness Enhancement of Supercritical Unit Power Control with IMC-PID Controller[J]. Electric Power, 2016, 49(6): 20-24.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.06.020.05

https://www.electricpower.com.cn/EN/Y2016/V49/I6/20

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