基于模糊短反馈分数阶滑模的稳压器压力控制

Control of Pressure Regulator Based on Fuzzy Short Feedback Fractional Order Sliding Mode

由于核电站稳压器复杂的特性,其压力控制系统的数学模型难以准确建立,且模型具有非线性、强耦合等特点,传统PID控制难以满足实际的性能要求。为了提高系统性能,提出了一种带有短反馈的模糊分数阶滑模双层反馈控制器。滑模控制能够对系统扰动及参数变化具有完全鲁棒性,短反馈算法的引入又能够构成双层反馈控制,实现对稳压器压力的快速、精准控制。滑模控制的引入将带来系统的抖震,为了克服系统抖震,一方面引入模糊控制,实现切换增益的在线调整;另一方面引入分数阶控制为系统提供更多的控制余度。经过仿真结果验证,带有短反馈的模糊分数阶滑模控制器相比与传统PID控制具有更加优良的性能指标和抗扰动能力。

Due to the complex characteristics of nuclear power plant regulator,the mathematical model of its pressure control system is difficult to establish accurately,and the model has the characteristics of nonlinearity and strong coupling.It is difficult for the traditional PID control to meet the actual performance requirements.In order to improve the system performance,a fuzzy fractional order sliding mode double-layer feedback controller with short feedback is proposed.Sliding mode control can be fully robust to system disturbances and parameter changes,and the introduction of short feedback algorithm can form a double-layer feedback control to achieve fast and accurate control of pressurizer pressure.The introduction of sliding mode control can bring chattering of the system.In order to overcome the chattering,on the one hand,fuzzy control was introduced to realize on-line adjustment of switching gain;On the other hand,fractional order control was introduced to provide more control redundancy for the system.The simulation results show that the fuzzy fractional order sliding mode controller with short feedback has better performance index and anti disturbance ability than traditional PID control.