基于μ综合的燃烧系统鲁棒控制

Robust control based on μ synthesis for combustion system

针对火电厂燃烧过程中主蒸汽压力控制系统的大时滞、大惯性和非线性,采用能迅速反映燃料侧扰动的辐射能信号进行快速补偿,设计一个混合灵敏度μ控制器作为主控制器。将μ分析方法引入锅炉燃烧控制系统,综合考虑了系统的鲁棒稳定性和鲁棒性能,解决了常规H∞控制性能不理想的问题。给出了基于μ综合理论的控制方法求解控制器的具体步骤,并分析了系统具有鲁棒稳定性和鲁棒性能的条件。仿真结果表明采用μ控制器有效地减小了稳态误差,明显改善了响应性能指标。

As the main steam pressure control of power plant combustion system has the features of big time-delay,big inertia and nonlinearity,a hybrid sensitivity μ controller is designed as its main controller, which takes the radiant energy as the sensitive signal to quickly reflect the perturbation of fuel side for rapid compensation. With the consideration of both system robust stability and performance,the μ synthesis analysis is introduced to boiler combustion system to avoid the defects of conventional H. controller in control performance. The concrete steps are given to get the solution of hybrid sensitivity μ controller and the conditions to ensure the system robust stability and performance are analyzed. Simulative result shows that the steady-state error is effectively reduced and the system response is obviously improved.