And it is a future direction for dcs binding acp . the project also provides a necessary way for students to understand modern control theory and acp theory , through which a good performance can be observed but ca n ' t be got from classical control theory 也是目前dcs和先进控制理论相结合发展的一个方向,同时作为实验室控制装置,为广大学生了解现代控制理论和先进控制理论提供了实际实验装置,并且能观察到经典控制理论所无法具有的实际控制效果。
2 ) linking the classical control theory with practice , it tries drawing a sententious and practical conclusion by optimization . correctness is proved by emulation with robust toolbox of matlab . 3 ) in view of the complicacy of the circuits , it optimizes reactive compensation by equivalent area theorem and programs by c . it has been used in practice and gets good benefit 2 )结合多年工作经验和一些经典控制理论对几种典型负荷网络的补偿容量、补偿位置进行优化,寻求比较实用、可行的结论,并对其进行基于matlab的仿真,证明其正确性、可行性,使其具有更广的应用性。
Fuzzy theory simulates the visual thinking of human being . it expresses the procedure of human ' s thinking in very simple mathematical format and need not precise mathematical modelinglt is a sort of efficient mathematical tool and solves some difficult problems perfectly in the field of classical control theory 而模糊理论则是模拟人类的形象思维,用比较简单的数学形式直接将人的判断等思维过程表达出来,不需要建立精确的数学模型,是一种有效的数学工具与手段,很好的解决了经典控制理论难以解决的问题。
Firstly , after analyzing the generated mechanism of surplus power , it can be found that surplus power affects the capability of loading seriously . secondly , according to the classical control theory , analyzes the capability of system and adopts pid and interfere compensation to eliminate the effects of the surplus power 本论文首先分析了加载系统的加载原理,和多余力的产生机理和本质特性,得出多余力严重影响加载系统的加载性能,并且这种多余力是由于承载对象的位置变化引起的。
Besides , the converters have unmodeled dynamics . so the traditional controller for hvdc based on the classical control theory can not meet the requirements in practice . although , pi controllers are widely used in the hvdc systems , they have high sensitive responses to random disturbances , low robust performance , and can not solve some problems in power systems , such as unmodeled dynamics , nonlinear uncertainties 直流输电线路中的换流器具有很强的非线性,系统的运行工况随时都会发生改变,系统扰动发生的地点、类型及严重程度具有随机性;此外,换流器还含有未建模动态部分,这些因素使得基于直流输电系统准静态模型的常规控制器设计方法常常不能很好地满足系统的实际要求。