改进型自抗扰技术在电厂热工系统中的应用
发布时间：2019-03-19 14:20
【摘要】：自抗扰控制技术的原理是将对象模型的不确定性、外部扰动以及参数的实时变化视为一个“总扰动”,对其进行实时估计并补偿,因此不需要被控对象的精确模型就可以完成控制作用,大大简化了控制系统的设计。然而大型电厂热工系统具有大迟延、大惯性、强非线性等特点,加大了自抗扰控制中存在的参数较多难整定,稳定性不易保证等问题。为提升现有自抗扰控制技术的性能以保证电力系统的稳定经济运行,本文主要做了如下几个方面的改进。首先,为了提高自抗扰控制器的抗扰性能,本文在线性自抗扰控制器结构基础上,设计了一种改进型自抗扰控制器。通过增加一个相同的线性扩张状态观测器,引入总扰动的估计误差值,并对该总扰动估计误差进行观测补偿,达到提高抗扰性能的目的。其次,针对自抗扰控制器整定过程中存在的受观测器带宽限制的问题,对原有参数整定方法做出了改进,总结出了一套完整的参数整定步骤,该方法在保证整定过程简便性的同时,大大减小了观测器带宽对扩张状态观测器速度的影响。最后,为验证上述两种改进方法的有效性,将其应用于某660MW超临界机组协调控制系统。仿真实验表明,改进型自抗扰控制技术可以获得较好的跟踪效果,较传统控制方法快速性有所提高且抗扰性更强,在工程上有一定的应用价值。
[Abstract]:The principle of ADRC is to treat the uncertainty of object model, external disturbances and real-time changes of parameters as a "total disturbance", and to estimate and compensate them in real-time. Therefore, the control function can be accomplished without the precise model of the controlled object, which greatly simplifies the design of the control system. However, the thermal engineering system of large-scale power plant has the characteristics of large delay, large inertia and strong non-linearity, which makes it difficult to adjust the parameters of ADRC, and the stability is not easy to guarantee and so on. In order to improve the performance of the existing ADRC technology to ensure the stable and economical operation of the power system, the following improvements have been made in this paper. Firstly, in order to improve the anti-disturbance performance of ADRC, an improved ADRC is designed on the basis of linear ADRC structure. By adding the same linear extended state observer, the estimation error of the total disturbance is introduced, and the estimation error of the total disturbance is observed and compensated, so as to improve the anti-disturbance performance. Secondly, aiming at the problem of limited bandwidth of observer in the tuning process of ADRC, the original parameter tuning method is improved, and a set of complete parameter tuning steps are summarized. This method not only ensures the simplicity of the tuning process, but also greatly reduces the influence of observer bandwidth on the speed of the extended state observer. Finally, in order to verify the effectiveness of the two improved methods, they are applied to a 660MW supercritical unit coordinated control system. The simulation results show that the improved auto-disturbance rejection control technique can obtain better tracking effect, which is faster and stronger than the traditional control method, and has a certain application value in engineering.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273;TM621
[Abstract]:The principle of ADRC is to treat the uncertainty of object model, external disturbances and real-time changes of parameters as a "total disturbance", and to estimate and compensate them in real-time. Therefore, the control function can be accomplished without the precise model of the controlled object, which greatly simplifies the design of the control system. However, the thermal engineering system of large-scale power plant has the characteristics of large delay, large inertia and strong non-linearity, which makes it difficult to adjust the parameters of ADRC, and the stability is not easy to guarantee and so on. In order to improve the performance of the existing ADRC technology to ensure the stable and economical operation of the power system, the following improvements have been made in this paper. Firstly, in order to improve the anti-disturbance performance of ADRC, an improved ADRC is designed on the basis of linear ADRC structure. By adding the same linear extended state observer, the estimation error of the total disturbance is introduced, and the estimation error of the total disturbance is observed and compensated, so as to improve the anti-disturbance performance. Secondly, aiming at the problem of limited bandwidth of observer in the tuning process of ADRC, the original parameter tuning method is improved, and a set of complete parameter tuning steps are summarized. This method not only ensures the simplicity of the tuning process, but also greatly reduces the influence of observer bandwidth on the speed of the extended state observer. Finally, in order to verify the effectiveness of the two improved methods, they are applied to a 660MW supercritical unit coordinated control system. The simulation results show that the improved auto-disturbance rejection control technique can obtain better tracking effect, which is faster and stronger than the traditional control method, and has a certain application value in engineering.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273;TM621
【参考文献】
相关期刊论文 前10条
1 操高城;张君颖;王东风;翟永杰;;基于模糊PID控制器的协调控制系统优化[J];计算机仿真;2014年12期
2 江溢洋;王东风;;基于逆向解耦的BTU协调系统内模控制设计[J];计算机仿真;2014年09期
3 马永光;李超;马良玉;张瑞青;;1000MW超超临界机组协调系统的线性自抗扰控制[J];动力工程学报;2014年08期
4 陈敏;徐孟，
本文编号：2443606
本文链接：https://www.wllwen.com/kejilunwen/zidonghuakongzhilunwen/2443606.html
