300MW机组汽包炉主蒸汽温度控制策略研究
发布时间：2019-02-19 12:37
【摘要】：经济和社会不断的要求电力工业提高效率和降低污染,相关电力部门也出台了一些改进措施,不断的提升火力发电机组的容量和参数,伴随而来就是不断提高控制参数指标,本文就300MW机组汽包炉的主蒸汽温度进行优化。本文简单介绍了课题研究的背景、主汽温控制的难点和研究现状,为了使主汽温在一定范围内变动,可以有很多方法做出改进,例如导前信号的选择、控制算法优化、对象模型确定等,在本文研究当中将采用对控制算法优化来改善传统的控制效果。确定了控制策略的改进方向之后,对本课题研究的锅炉及其主汽温系统、被控对象的动态特性进行分析,了解了主汽温系统的工艺流程,及其在控制过程中相关因素对它的影响,确定了通过调节喷水量来控制主汽温。然后介绍了主汽温的常规控制系统：带有导前微分信号的PID控制系统和串级PID控制系统。考虑到主汽温被控对象就是一个大滞后、模型不精确的时变非线性对象,火电厂PID控制系统只能在一定范围内达到良好的动态性能,而模糊PID控制器却正好能够满足这种情况,故最后选择采用模糊技术与串级系统结合的控制方案。此控制方案副调节器采用的P控制器,主调节器选用模糊PID自适应控制器,而此模糊控制器的比例因子由另一个辅助模糊控制器来在线调整,能够根据输出的变化来调整PID控制器的三个参数,从而达到在线自调整的控制效果。在MATLAB/Simulink仿真平台上进行串级PID控制系统和改进方案的性能比较,可得知改进后的方案在抗扰和鲁棒能力上得到了很大的改进。
[Abstract]:The economy and society constantly request the electric power industry to improve its efficiency and reduce pollution. The relevant power departments have also introduced some improvement measures to continuously raise the capacity and parameters of the thermal power generating units, with which the control parameters are constantly raised. The main steam temperature of drum furnace of 300MW unit is optimized in this paper. This paper briefly introduces the background of the research, the difficulties and the present situation of the main steam temperature control. In order to change the main steam temperature within a certain range, there are many ways to make improvements, such as the selection of the leading signal, the optimization of the control algorithm, In this paper, the optimization of the control algorithm will be used to improve the traditional control effect. After the improvement direction of the control strategy is determined, the dynamic characteristics of the boiler and its main steam temperature system studied in this paper are analyzed, and the technological process of the main steam temperature system is understood. The main steam temperature is controlled by adjusting the amount of spraying water. Then the conventional control system of main steam temperature is introduced: PID control system with derivative differential signal and serial PID control system. Considering that the main steam temperature controlled object is a time-varying nonlinear plant with large delay and imprecise model, the PID control system of thermal power plant can only achieve good dynamic performance within a certain range, but the fuzzy PID controller can meet this situation. Therefore, the control scheme which combines fuzzy technology and cascade system is selected at last. The P controller used in the secondary regulator of this control scheme, the fuzzy PID adaptive controller is used as the main regulator, and the proportion factor of the fuzzy controller is adjusted online by another auxiliary fuzzy controller. The three parameters of the PID controller can be adjusted according to the change of the output so as to achieve the on-line self-adjusting control effect. The performance comparison between the cascade PID control system and the improved scheme on the MATLAB/Simulink simulation platform shows that the improved scheme has been greatly improved in immunity and robustness.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
本文编号：2426505
[Abstract]:The economy and society constantly request the electric power industry to improve its efficiency and reduce pollution. The relevant power departments have also introduced some improvement measures to continuously raise the capacity and parameters of the thermal power generating units, with which the control parameters are constantly raised. The main steam temperature of drum furnace of 300MW unit is optimized in this paper. This paper briefly introduces the background of the research, the difficulties and the present situation of the main steam temperature control. In order to change the main steam temperature within a certain range, there are many ways to make improvements, such as the selection of the leading signal, the optimization of the control algorithm, In this paper, the optimization of the control algorithm will be used to improve the traditional control effect. After the improvement direction of the control strategy is determined, the dynamic characteristics of the boiler and its main steam temperature system studied in this paper are analyzed, and the technological process of the main steam temperature system is understood. The main steam temperature is controlled by adjusting the amount of spraying water. Then the conventional control system of main steam temperature is introduced: PID control system with derivative differential signal and serial PID control system. Considering that the main steam temperature controlled object is a time-varying nonlinear plant with large delay and imprecise model, the PID control system of thermal power plant can only achieve good dynamic performance within a certain range, but the fuzzy PID controller can meet this situation. Therefore, the control scheme which combines fuzzy technology and cascade system is selected at last. The P controller used in the secondary regulator of this control scheme, the fuzzy PID adaptive controller is used as the main regulator, and the proportion factor of the fuzzy controller is adjusted online by another auxiliary fuzzy controller. The three parameters of the PID controller can be adjusted according to the change of the output so as to achieve the on-line self-adjusting control effect. The performance comparison between the cascade PID control system and the improved scheme on the MATLAB/Simulink simulation platform shows that the improved scheme has been greatly improved in immunity and robustness.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
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