交叉口相位自适应信号控制优化方法  

A Method for Optimizing Adaptive Signal Control of Phase at Intersection

作　　者：郑保力 杨逢肃 ZHENG Bao-li;YANG Feng-su(Hualan Design&Consulting Group Co.,Ltd.,Nanning Guangxi 530011,China)

机构地区：[1]华蓝设计(集团)有限公司,广西南宁530011

出　　处：《公路交通科技》2023年第7期200-206,共7页Journal of Highway and Transportation Research and Development

基　　金：2018年度南宁市创新创业领军人才“邕江计划”项目(2018—01—13)。

摘　　要：目前对交叉口信号控制问题的研究大多基于固定的相位相序方案,或在几种特定的相位相序方案中进行选择,难以适应交通流的时变特性,在交叉口交通流不均衡的情况下无法充分发挥交叉口的运行效率。针对该问题,提出一种交叉口相位自适应信号控制方法。首先根据交叉口交通流之间的冲突关系,构建了交叉口信号相位集。结合信号控制领域知识,形成了对交叉口相位相序方案、绿灯时长方案及相关约束的数学描述。在此基础上,建立了交叉口相位自适应信号控制的双层规划模型。上层规划以车辆的释放量最大为目标,以相位唯一性约束、车流连续性约束、周期完整性约束为约束条件,对相位相序方案进行优化。下层规划以车辆释放效率最大为目标,以车流最小、最大绿灯时长为约束,对相位绿灯时长进行优化,并将结果返回上层规划。通过上、下层之间的交互,实现对相位相序及绿灯时长的同步优化。为验证方法的有效性,在交叉口非饱和、饱和、过饱和状态下,将该方法与定相位控制、NEMA双环相位结构控制、基于排队长度的贪心控制等方法进行了对比。结果表明:在交叉口不同状态下,与其他方法相比,该方法在车辆释放效率、平均停车延误、平均停车次数、交叉口排队长度等方面均表现出一定的优越性。The researches on controlling intersection signals is mostly based on fixed phase sequence schemes or selection from several specific phase sequence schemes at present,which is difficult to adapt to the time-varying characteristics of traffic flow and cannot fully utilize the operational efficiency of intersection in the case of imbalanced traffic flow.In view of this issue,a phase adaptive signal control method for intersection is proposed.First,the signal phase set for intersection is established based on the conflict relationship between traffic flows at intersection.Combining the knowledge of signal control domain,the mathematical description of the phase sequence scheme,green light duration scheme and related constraints for intersection is formed.On this basis,a bi-level programming model for adaptive signal control of intersection phase is established.The upper level programming aims to maximize the release of vehicles,and optimizes the phase sequence scheme with constraints of phase uniqueness,continuity of traffic flow and periodic integrity.The lower level programming aims to maximize vehicle release efficiency,and optimizes the phase green light duration with minimum traffic volume and maximum green light duration as constraints,and returns the result to the upper level programming.By interacting between the upper and lower layers,synchronous optimization of phase sequence and green light duration is achieved.To verify the effectiveness of the proposed method,it is compared with fixed phase control,NEMA dual-loop phase structure control and greedy control based on queue length under unsaturated,saturated and oversaturated conditions at intersection.The result shows that compared with other methods in different states of intersection,this method exhibits certain advantages in terms of vehicle release efficiency,average parking delay,average number of stops and intersection queue length.

关 键 词：智能工程 交通信号控制 双层规划 相位相序方案 绿灯时长 

分 类 号：U491[交通运输工程—交通运输规划与管理]