Steam Pressure Control System Research Articles

Steam Pressure Control of Marine Boiler Based on AFSA-PSO-LSSVM

Abstract To solve the problem that the main steam pressure fluctuates greatly when the load of the combustion control system of the marine main boiler changes suddenly, present a combined inverse control system of Support vector machine and PID to control the steam pressure intelligently. The inverse model of the nonlinear system identified by LSSVM is used as the feedforward controller and the PID controller is used as the feedback controller. The hybrid intelligent algorithm of artificial fish swarm Algorithm and particle swarm optimization is used to optimize the parameters of the control system. The AFSA algorithm is used to search the initial values of the parameters and the PSO algorithm is locally updated. Finally, the mechanism of the steam pressure control system of the marine boiler is modeled and simulated, and the algorithm models of AFSA-PSO-LSSVM-PID, AFSA-LSSVM-PID, PSO-LSSVM-PID and LSSVM-PID are established. The experimental results show that the AFSA-PSO-LSSVM-PID model has a good dynamic, stability, anti-interference ability and robustness.

Rancang Bangun Kendali Tekanan Uap Air pada Tangki Pemanas Menggunakan Pengendali PID Berbasis PLC

Process control is needed in various types of industries for production. The controlled process variables can be temperature, flow, pressure, and level. For this reason, an automatic control system with the right method is needed to produce quality products. This study aims to design and implement a steam pressure control system on a prototype heating tank using PID controller based on PLC. The pressure in the heating tank will be controlled to a set point of 10 kPa with a maximum steady-state error of 3%. PID control is designed using the Ziegler Nichols method which is then implemented on the PLC Omron CP1H with an MPX5500DP sensor to detect pressure. The results of the research obtained are that the PI controller can produce a better response when compared to the P and PID controllers. PI controller with parameters Kp = 1.23, Ti = 860, and Td = 0 can produce a response with a rise time of about 300 seconds and a steady-state error of 3.3%.

Decoupling header steam pressure control strategy in Multi-Reactor and Multi-Load Nuclear Power Plant

The aim of this paper is to design valve opening compensators for the header steam pressure control system of a Multi-Reactor and Multi-Load Nuclear Power Plant (MMNPP) using the feedforward compensation decoupling method. The mathematical model of the MMNPP consisting of two small modular reactor units, a steam header and three steam consuming units, (two-to-three MMNPP) was developed, including a nonlinear point reactor core model with six-group delayed neutron, an once-through steam generator (OTSG) model based on the moving boundary concept and a lumped parameter header model. Then linearization method was applied to the header model to obtain the corresponding transfer function model based on which feedforward compensators for header outlet valves were designed and integrated into the header steam pressure control system. It has been demonstrated by numerical simulation results that the developed header steam pressure control system with valve opening compensators can alleviate the coupling effect among header outlet flowrates, leading to much safer and more stable operations of the MMNPP than the existing header steam pressure control system without valve opening compensators. The control strategy given in this paper can be extended to more complex MMNPPs.

SHIP BOILER STEAM PRESSURE CONTROL SYSTEM BASED ON BP-PID CONTROL

The control of steam’s pressure is the key link of boiler power plant, its control performances influence the rotate speed of steam turbine directly. Boiler steam’s pressure has the characteristics of time-varying, nonlinearity, large inertia and large hysteresis. The traditional PID control method does not have the ability of self-adaptability, and it is difficult to meet the system’s requirements. In order to solve the problem, this paper design a boiler steam pressure control system based on BP-PID control. A second-order mathematical model with time delay of boiler steam’s pressure is used as the controlled object, the PID controller and the PID controller based on BP neural network are used to control it.The whole process is simulated by MATLAB software.The simulation results show that when the PID controller based on BP neural network is adopted, the response curve has no oscillation, no overshoot and short transition time, the control effect is better than traditional PID controller.

Design and Simulation of Main Steam Pressure Control System Based on Dynamic Matrix Control

Main steam pressure is a typical controlled process with complex modeling and serious delay. Traditional control schemes are difficult to implement effective control. This paper designs the main steam pressure control system based on the dynamic matrix control algorithm and gives the simulation results under MATLAB adopting multi-step prediction, rolling optimization and feedback correction and other control strategies. Compared with the traditional control scheme, dynamic matrix control has a strong ability to adapt, showing a strong robustness.

Study on Fuzzy Immune PID Controller for Main Steam Pressure Control System in Marine Steam Power Plant

The main steam pressure control system in marine steam power plant has the characteristics of time-varying, nonlinear and strong coupling. In order to get satisfactory control effect, we propose a fuzzy immune PID controller with which we can make comprehensive utilization of advantages of artificial immune, PID and fuzzy controller. We build up mathematical model of main steam pressure control system, carry out simulation and comparison. The results prove that fuzzy immune PID controller can significantly reduce the overshoot and settling time of main steam pressure. It is more effective in main steam pressure control system than PID controller.

Study on the CFBB Main Steam Pressure Control System Based on ADRC Technology

The combustion process of CFBB is a system with time-varying, nonlinear, large inertia and time delay. Therefore the control effects of traditional PID control system in the CFBB plant are not satisfactory , especially the overshoot of the main steam pressure control system is very big, and the adjustment time is too long. To improve the performance of the main steam pressure control system, ADRC technology was used . The disturbed signal was added in the different operating conditions, the testing results indicated that the ADRC main steam pressure control system had more excellent performance than the convention PID method.

Adaptive Fuzzy PID Applied in Steam Pressure Control System

Boiler steam pressure control system is important because of affecting the turbine speed directly. In engineering, the steam pressure control system is mostly dominated by traditional PID control. But the traditional PID control strategy can’t obtain satisfied control effects with the changing of the fuel and give-wind flow. The use of intelligent control strategy has been studied in recent years in order to improve steam pressure control. In this paper steam pressure control system with adaptive fuzzy PID control is presented, and the simulation results based on MATLAB show that the proposed algorithm can largely improve the system response performance compared to the traditional PID control.

Boiler Steam Pressure Control System Based on Fuzzy Control

Industrial boiler steam pressure is an important measure of boiler normal operation. Since there is delay and inertial part, single-loop PID control is difficult to achieve good dynamic characteristics. By analyzing the characteristics of the steam pressure controlled object, this paper presents a fuzzy adaptive PID control based on the cascade control system. Finally, in order to analyze the effect of the control system, mathematical model was constructed by MATLAB simulation to compare fuzzy adaptive PID cascade control with conventional PID control. The results prove that the former has a good control effect.

On study of steam bypass and pressure control system for Lungmen nuclear power plant

The investigation of steam bypass and pressure control system (SBPCS) is performed by RETRAN-3D code for Lungmen nuclear power plant. The purposes of this study are: 1) to demonstrate that the dynamic response of SBPCS is capable of controlling the system pressure smoothly when the reactor steam generation exceeds the steam flow used by the turbine, and 2) to study the effect of pressure regulator (PR) on dynamic response. The dynamic response of SBPCS is evaluated by means of the perturbations induced by pressure setpoint changes. The parametric study of SBPCS performs the effect of lead-lag regulator on the dynamic response. Finally, the resultant dynamic responses indicate that the design of SBPCS is capable of damping the system oscillation and bring the system to a stable state.

Two Degree of Freedom Servo Controller Incorporated with Reference and Disturbance Feedforward and an Application to a Steam Pressure and Flow Control System

In this report a design method for a servo controller with a disturbance feedforward is presented. A conventional controller with feedforward often generates an excess output as a result of the addition of the integrator signal and the feedforward signal. The additional feedback can be inserted to canncel the integrator signal. The controller can be implemented by the same configuration as a two degrees-of-freedom LQI servo system. Experimental results show availability and practicablity to a real plant.