考虑断点成本的长干线分段绿波控制方法

Partitioned green-wave control scheme for long arterial considering breakpoint cost

为了解决交叉口数量较多的长干线绿波控制中绿波带宽较小或无可行带宽的问题,在经典双向绿波控制模型算法的基础上,建立考虑断点成本的长干线分段绿波控制算法.通过0-1状态变量描述各交叉口是否为绿波分段点,根据同一子段内部交叉口与不同子段之间交叉口的带宽关系及绿波传递关系,调整优化求解算法中的带宽约束与整环约束,考虑绿波分段点处的带宽损失,以不含子段首个交叉口带宽的实际长干线带宽总和为优化目标,构建考虑断点成本的长干线分段绿波控制求解算法.通过算例,对比MAXBAND-81经典模型与所提方法的求解结果.研究结果表明,相对于MAXBAND-81,利用所提算法能够有效地提高长干线协调控制绿波带宽,提升长干线主路的通行效率;当无法确定分段数限制时,利用所提方法可以在全局范围内求得最优的绿波分段划分方法与长干线最大带宽和.

An algorithm was proposed to optimize the subsystems partition method and signal coordination scheme for the long arterial considering breakpoint cost based on the classical signal coordination scheme model in order to prevent the occurrence of few or infeasible bandwidth in a long arterial signal coordination progression. Whether each intersection is a green wave segmentation point was described by a series of binary variables. The bandwidth and loop integer constraints in the algorithm were revised according to the different coordination connection between two intersections which belong to a same subsystem or not. The actual bandwidth sum with the loss at the beginning of each subsystem was taken as the optimization objective by considering the bandwidth loss at the breakpoint between two subsystems. The subsystems partition and signal coordination scheme for long arterial considering breakpoint cost was proposed. Results show that proposed model can effectively increase the subsystem bandwidth and improve the main arterial efficiency by comparing the solutions of MAXBAND-81 with proposed model. The optimal subsystem partition method and the maximum bandwidth sum can be obtained by proposed model in the global scope when the limit number of subsystems cannot be determined before operation.