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Water Level Control of Steam Generator Based on PID and H_∞ Control Approaches

Author: DongZiLiang
Tutor: WangJunLing
School: Harbin Engineering University
Course: Nuclear Energy Science and Engineering
Keywords: Steam Generator water Level PID control linear matrix inequality state feedback H_∞controller
CLC: TL353.13
Type: Master's thesis
Year: 2009
Downloads: 193
Quote: 1
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Abstract


One of the major components in a PWR plant is U-tube steam generator (SG) that provides necessary steam for generating electricity power. Properly controlling the water level of SG is very important in order to secure the sufficient cooling source of nuclear reactor and prevent the damage of turbine blades. There are factors such as nonlinearity, high complexity, time varying, swell-and-shrink phenomena and non-minimum phase dynamics which make water level control problem of SG very challenging. What’s more, SG parameters undergo large changes according to different operational conditions. The SG cannot work satisfactorily with conventional fixed PID gains over full operating range.In this paper, we study classical PID control and robust H∞control of SG water level. First of all, with the combination of SG water level model, this paper addresses analyses on the existence mechanism of "false water level" phenomenon of SG, then analysis and simulation are shown on the impact of steam flow and water flow rate to the water level, respectively. In accordance with the difficulty of SG water level control, single level PID controllers, cascade PID controllers and dual PID controllers are designed. Furthermore, simulations are demonstrated the designed water level control system according to the change of steam flow. Based on robust control theory, we study H∞state feedback control method on water level system of SG via linear time-invariant system theory and linear parameters-varied system theory. Global state feedback H∞controllers and piecewise state feedback H∞controllers are derived in terms of linear matrix inequality approach. And the resulting controllers are able to guarantee the stability of SG water level control system and H∞performance index via simulations. Finally, it is shown that the combination of PID controller and two kinds of piecewise state feedback H∞ controllers can achieve more effective control of the SG water level on the basis of ensuring the stability and performance index of the water level control system.In this paper, the SG water level control systems are programmed and simulated with MATLAB software. SG water level linear parameter-varying model is prepared by the S-functions, in which the parameter of the model is changed in accordance with the working power in the simulation in order to make the water level simulation closer to the actual changes in water level.

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CLC: > Industrial Technology > Nuclear technology > Engineering of Nuclear Reactors > Reactor components and the design, manufacture > Circuit and its equipment > Thermal equipment and cooling system > A steam generator and a heat exchanger
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