基于曲线跟踪法的模糊增量型PI控制器设计及应用

Design and Application of Fuzzy Incremental PI Controller Based on Curve Tracking Method

随着天然气管网的建设发展,输气站场的控制方式逐渐由传统的人工值守方式向无人值守、集中监控的智能化方式转变。浙江省天然气管网在站场无人化系统的研究和建设过程中,为实现压力调节回路中主、备用支路的冗余及无扰切换的目标,以及在用户负荷剧烈变化时,特别是站场上下游两级调节器背靠背设置的极限管容工况下,满足系统调节的稳定性和抗耦合性要求,开发设计了一种有效的支路冗余及系统调节控制方法。研究结果表明:(1)在压力调节过程中,通过控制算法的改进,相比传统PID控制,无论在系统的快速响应还是超调量控制方面均有显著改善,且在合适的参数支持下具有极广的适应性;(2)在支路冗余切换方面,结合支路负载能力和调节控制算法,达到了支路间无扰切换的功能要求;(3)在抗耦合能力方面,根据设备特性和调节趋势来改变控制速度,以此优化调节过程而迫使系统收敛,从而实现解耦的目的;(4)在实际应用方面,系统完全满足输配站场无人值守集中监控的要求,系统运行稳定可靠。

With the development of natural gas pipeline network,the control mode of gas transmission stations has gradually changed from the traditional manual duty to the intelligent mode of centralized monitoring and control.In the process of the station yard unmanned system in the natural gas network in Zhejiang Province studied and constructed,an effective branch redundancy and system regulation control method is developed and designed.The goal of redundancy and undisturbed switching of the main and standby branches in the pressure regulating loop could be achieved,and when the user load changes dramatically,especially under the condition of the limit pipe capacity set by the upstream and downstream two-stage regulators in the station yard,the stability and anti-coupling requirements of the system regulation are met.The application results in five natural gas transmission stations show that(1)in the process of pressure regulation,compared with the traditional PID control,the control algorithm has a significant improvement in both the quick response of the system and the overshoot control,and it has wide adaptability under the support of appropriate parameters;(2)in the aspect of branch redundancy switching,combined with branch load capacity and regulation control algorithm,the functional requirements of hot standby redundancy and undisturbed switching are achieved;(3)in the aspect of anti-coupling ability,the control speed is changed according to the characteristics of the equipment and the control trend,so as to optimize the adjustment process and force the system to converge,thus realizing the purpose of decoupling;(4)in practical application,the system fully meets the requirements of centralized monitoring and control of unattended stations,runs stably and reliably,and improves the safety,stability and gas supply quality of natural gas transmission and distribution.