船舶汽轮发电机组阀门独立控制与低频振荡  

Shipboard turbine generator independent valve control and low frequency oscillation

作　　者：朱永欣[1] 张晓锋[1] 黄靖[1] ZHU Yong xin;ZHANG Xiao-feng;HUANG Jing(College of Electrical Engineering,Naval Univ.of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电气工程学院,武汉430033

出　　处：《海军工程大学学报》2020年第2期74-80,86,共8页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51877212)。

摘　　要：为提高船舶汽轮发电机组运行稳定性,在阐述汽轮机调速机理的基础上,建立了船舶汽轮发电机组及其调速系统的实用数学模型。在DEH调速方式下,提出了基于阀门独立控制的汽阀流量特性改良方法,分析了油动机死区、调节限幅等不理想因素在阀门传统控制环境下对机组长期稳定运行可能造成的危害,并从信号传递的角度阐明该特性可能导致机组受迫振荡的机理。利用PSCAD仿真软件,对比测试油动机非线性特性在传统阀门控制方式和阀门独立控制方式下的不同影响。仿真结果表明:采用阀门独立控制方式有利于机组抑制受迫低频振荡,更好地保障船舶电网运行安全。实测一台兆瓦级汽轮发电机组的调速实验转速波形,印证了相关分析及仿真结论。In order to improve the operation stability of shipboard turbo-generator,the principle of gas-turbine rotation speed adjustment is described,and practical model of shipboard turbine generator together with its speed control system is built.Using the DEH speed control mechanism,a flow cha-racteristic optimization method based on independent valve control mode is proposed.The undesirable factors of hydraulic actuator caused by its dead band and control limit pose a threat to the long-term stable operation of gas turbines under independent valve control,and,therefore,the principle of forced oscillation induced by nonlinear characteristic is analyzed from signal transmission perspective.PSCAD simulation software is applied in order to compare the different responses of traditional valve control mode and independent valve control mode under the influence of nonlinear characteristic of hydraulic actuator.The result indicates that,independent valve control mode is advantageous for turbine generator to suppress forced low frequency oscillation and keep the safe operation of shipboard power system.The result of a speed control experiment of a MW-level turbine generator has confirmed the conclusion.

关 键 词：船舶电站 汽轮发电机组 升程-流量特性 汽阀独立控制 低频振荡 

分 类 号：TM761[电气工程—电力系统及自动化]