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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Adaptive PID Cascade Control for Superheated Steam Temperature Based on Inverse Model

[+] Author and Article Information
Zhijie Wang, Hong Chen

School of Power Engineering, Chongqing University, Chongqing 400044, PR China

Guangjun Wang1

School of Power Engineering, Chongqing University, Chongqing 400044, PR Chinawangguangjun@cqu.edu.cn

1

Corresponding author.

J. Eng. Gas Turbines Power 133(11), 111602 (May 19, 2011) (6 pages) doi:10.1115/1.4003644 History: Received November 29, 2010; Revised January 22, 2011; Published May 19, 2011; Online May 19, 2011

Since the superheated steam temperature system of boiler in thermal power plant is characterized as time varying and nonlinear, it is hard to achieve a satisfactory performance by the conventional proportional-integral-derivative (PID) cascade control scheme. This paper presents a design method of adaptive PID cascade control system for superheated steam temperature based on inverse model: First, the inner loop and the outer process in the cascade control system are equivalent to a generalized plant. A simplified Takagi–Sugeno (STS) fuzzy model is adopted to identify the inverse model of the generalized plant. By choosing the appropriate structure and optimizing with constrains for the parameters of the inverse model, the organic combination of the PID primary controller with the inverse model is realized. To maintain the structure of the existing conventional PID cascade control system in power plant without change, in the control process, the parameters of the primary controller are adjusted on-line according to the identification result of the inverse model of the generalized plant; thus an adaptive PID cascade control system is formed, which matches with the characteristics of the controlled plant. Through the simulation experiments of controlling superheated steam temperature, it is illustrated that the proposed scheme has good adaptability and anti-interference ability.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The structure of adaptive IM-CC system

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Figure 2

The responses of the three control schemes in the process of switching C-CC to IM-CC system

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Figure 3

The responses of the three control schemes in the process of switching the unit load

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Figure 4

The unit-step responses of the three control schemes at 100% load

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Figure 5

The unit-step responses of the three control schemes at 75% load

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Figure 6

The unit-step responses of the three control schemes at 50% load

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Figure 7

The responses of the three control schemes when external disturbance is added (d1=0.5)

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