掺烧煤矸石、泥煤、生物质等燃料以及深调峰运行使得循环流化床机组呈现出更明显的大迟延特性,并且迟延时间随燃料性质变化而变化,传统PID控制难以取得良好的控制效果,为此提出将柔性Smith预估控制应用于循环流化床机组协调控制系统中...掺烧煤矸石、泥煤、生物质等燃料以及深调峰运行使得循环流化床机组呈现出更明显的大迟延特性,并且迟延时间随燃料性质变化而变化,传统PID控制难以取得良好的控制效果,为此提出将柔性Smith预估控制应用于循环流化床机组协调控制系统中。首先依据循环流化床机组机侧闭环调节方式下燃料量对热量信号的传递函数,在直接能量平衡(direct energy balance,DEB)控制方案基础上,设计PID+Smith预估控制形式的锅炉主控,用以补偿对象大迟延特性;其次针对迟延时间的不确定性,在Smith预估控制回路中增加1个柔性因子,在对象迟延时间变化时,使锅炉侧控制器在偏向于PID控制和Smith预估控制之间做柔性切换。仿真和现场调试表明,此设计能兼顾控制品质和燃料适应性的要求。展开更多
Tram systems with the advantages of reliable operation,comfort,low emissions and moderate capacity have been quite popular in recent years in China.However,there are still problems with tram signal control(e.g.evaluat...Tram systems with the advantages of reliable operation,comfort,low emissions and moderate capacity have been quite popular in recent years in China.However,there are still problems with tram signal control(e.g.evaluation model,signal control strategies).In-depth analysis on existing operational issues of trams,calculation of two evaluation indexes,as well as a flexible model-free tram signal priority method were developed to deal with tram problems.Empirical research in Songjiang District,Shanghai shows that:(1)The function of the green extension strategy is limited with c.a.10%tram priority improvement,while the optimal one can reach to 85%higher on average.(2)A scheme with a benefit for trams and with no negative impact,and even benefits,for general traffic can be realized.(3)The optimal solution is beneficial for intersections with a maximum c.a.70%amelioration with delay decreasing from 132.7 s/vehicle to 40.89 s/vehicle,or from 104.77 s/capita to 22.31 s/capita.This paper has great significance for the signal optimization and safety of tram systems,even the development of a comprehensive transportation system for a city.展开更多
文摘掺烧煤矸石、泥煤、生物质等燃料以及深调峰运行使得循环流化床机组呈现出更明显的大迟延特性,并且迟延时间随燃料性质变化而变化,传统PID控制难以取得良好的控制效果,为此提出将柔性Smith预估控制应用于循环流化床机组协调控制系统中。首先依据循环流化床机组机侧闭环调节方式下燃料量对热量信号的传递函数,在直接能量平衡(direct energy balance,DEB)控制方案基础上,设计PID+Smith预估控制形式的锅炉主控,用以补偿对象大迟延特性;其次针对迟延时间的不确定性,在Smith预估控制回路中增加1个柔性因子,在对象迟延时间变化时,使锅炉侧控制器在偏向于PID控制和Smith预估控制之间做柔性切换。仿真和现场调试表明,此设计能兼顾控制品质和燃料适应性的要求。
基金supported by the National Nature Science Foundation of China(Grant No.51178343)。
文摘Tram systems with the advantages of reliable operation,comfort,low emissions and moderate capacity have been quite popular in recent years in China.However,there are still problems with tram signal control(e.g.evaluation model,signal control strategies).In-depth analysis on existing operational issues of trams,calculation of two evaluation indexes,as well as a flexible model-free tram signal priority method were developed to deal with tram problems.Empirical research in Songjiang District,Shanghai shows that:(1)The function of the green extension strategy is limited with c.a.10%tram priority improvement,while the optimal one can reach to 85%higher on average.(2)A scheme with a benefit for trams and with no negative impact,and even benefits,for general traffic can be realized.(3)The optimal solution is beneficial for intersections with a maximum c.a.70%amelioration with delay decreasing from 132.7 s/vehicle to 40.89 s/vehicle,or from 104.77 s/capita to 22.31 s/capita.This paper has great significance for the signal optimization and safety of tram systems,even the development of a comprehensive transportation system for a city.
