Research on method for modelling and control of feedwater piping system based on internal characteristics of the feedwater pump

2019 14th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) Pub Date : 2019-11-01 DOI:10.1109/ICEMI46757.2019.9101744

Zou Hai, Zheng Ying, Du Enwu

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Abstract

In this paper, a method for modelling and control of feedwater piping system based on internal characteristics of the feedwater pump is introduced considering the modelling, control and simulation of the feedwater control system. The traditional modelling based on characteristic curves of the feedwater pump can only describe the steady-state characteristics of the feedwater piping system, while the modelling method of feedwater piping system based on the internal characteristics of the feedwater pump can simultaneously simulate both the steady-state and dynamic characteristics of the feedwater piping system, providing a simulation test object for feedwater control system design. A mathematical model of the feedwater piping system based on the internal characteristics of the feedwater pump is created according to the momentum moment theorem and latticed wing analysis theorem. VC++6.0 is applied to develop the simulation program and the Runge-Kutta method is applied for solving the mathematical model. In this paper, we also design the feedwater pump speed control system, apply the scheme of simultaneous control of feedwater regulating valve pressure difference and turbine feedwater pump speed difference, and increase the anti-interference ability of the feedwater pump in parallel operation. The speed control system of the turbine feedwater pump is verified by simulation tests on typical working conditions of the feedwater piping system. Simulation results show that this modelling method can describe the steady-state and dynamic characteristics correctly, with certain significance in engineering application.

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基于给水泵内部特性的给水管系统建模与控制方法研究

针对给水泵给水管系统的建模、控制和仿真，提出了一种基于给水泵内部特性的给水管系统建模和控制方法。传统的基于给水泵特性曲线的给水管系统建模只能描述给水管系统的稳态特性，而基于给水泵内部特性的给水管系统建模方法可以同时模拟给水管系统的稳态和动态特性，为给水控制系统设计提供了仿真试验对象。根据动量矩定理和格翼分析定理，建立了基于给水泵内部特性的给水管系统数学模型。采用vc++ 6.0开发仿真程序，采用龙格-库塔法求解数学模型。本文还设计了给水泵调速系统，采用了同时控制给水调节阀压差和水轮机给水泵转速差的方案，提高了给水泵并联运行时的抗干扰能力。通过给水泵系统典型工况的仿真试验，验证了汽轮机给水泵调速系统的有效性。仿真结果表明，该建模方法能较好地描述系统的稳态和动态特性，具有一定的工程应用意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 14th IEEE International Conference on Electronic Measurement & Instruments (ICEMI)

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