摘要
针对目前控制工程中采用的激励信号获取对象动态模型存在较高的噪信比,抗干扰能力较弱等问题,提出一种双阶跃激励信号的LCR(inductance capacitance resistance)发散振荡方法。通过从频域与时域角度分别进行理论分析,得出了该方法抗干扰能力较强的结论。并将该方法应用于控制系统频率特性辨识中,仿真实验表明,在较强干扰环境下可获得较为准确的频率特性。最后,本文的方法应用于电站锅炉的炉膛压力控制系统频率特性分析中,与点频滤波器方法相比获得了更加贴近实际的频率特性。仿真实验和实际应用结果表明了本文方法的正确性和有效性。
High signal-noise ratio and weak anti-jamming characteristics are consistent in control practice for obtaining systems＇ mathematic models. The method of LCR diverging oscillation with double step excitation signal was proposed. It was concluded that the method has well resistibility to noise interference though the analysis in the aspects of frequency domain and time domain. And then,the method was utilized in the analyzing the characteristics of control system. The simulation results indicated that the more exact characteristics could be achieved once the method proposed was utilized. Finally,the method was applied in the course of analyzing the characteristics of furnace pressure in some a power plant boiler.The characteristics more closed to the engineering practice were obtained than that is by the method of point-frequency filter. Simulations and practical application well present that the proposed method is proper and effective.
出处
《电机与控制学报》
EI
CSCD
北大核心
2014年第11期112-118,共7页
Electric Machines and Control
基金
国家自然科学基金(60974119)
关键词
信号频率谱辨识
随机噪声干扰
功率噪信比
双阶跃激励
持续激励
LCR发散振荡
signal frequency spectrum identification
random noise interference
noise to signal power ratio
double step excitation
persistent excitation
LCR diverging oscillation
