基于鲁棒自适应策略的燃气轮机系统控制器设计

Robust controller design for gas turbine systems via robust adaptive control technique

太阳能、风能和潮汐能等可再生能源的发电系统,具有间歇性发电的特性.因此,具有快速响应、发电效率高的燃气轮机发电系统,能够在可再生能源发电间歇出现时充当替代系统,不仅稳固电网的负荷能力,还有助于推动可再生能源的发展.由于燃气轮机是一个模型包含未知的复杂非线性系统,目前针对转速环节主要采取传统PID控制技术.然而,实际运行中系统工况发生变化时,控制器参数不能随着这些变化做出相应的调整,使得控制效果欠佳,执行器故障的出现也可能导致系统无法正常工作.因而,本文针对单轴燃气轮机的孤岛发电模式,结合燃气轮机系统特性,基于反步法的设计思路,引入不依赖于系统模型的鲁棒自适应控制策略,并加入容错控制和Nussbaum函数构造转速控制器.在控制器设计过程中融合动态面方法,解决高阶系统中反步法引起的计算爆炸问题.最后,通过仿真,验证了控制器的可靠性.

Lots of sustainable resources cannot provide continuous and stable energy for their characteristics of intermittent power providing,such as solar,wind,and tidal energy.Gas turbine power generation system demonstrates vast potential as an energy resource,due to its fast response and high efficiency characteristics,making it an ideal alternative source for hybrid renewable energy generation systems.However,its mathematical modeling often leads to complex nonlinear dynamics.Moreover,the most important part is the speed control loop,where traditional PID controllers were always applied.However,the parameters of controllers cannot be adjusted automatically,which will weaken the power system performance.Besides,considering that the actuator fault occurs,traditional controllers cannot guarantee the stability of the system,which may lead to failure of the plants operating.Therefore,by focusing on modeling a simplified single-shaft gas turbine generation system under stand-alone operation,this paper develops a control scheme for speed tracking loop based on the backstepping method.To account for modeling uncertainties and external disturbances,a robust adaptive control,combined with a dynamic surface control,is constructed.Besides,by considering the possibility of actuator faults,a fault tolerant control unit with Nussbaum-type functions is utilized.Finally,simulations verify that the presented controllers ensure high precision of tracking performance.