【摘要】 无速度传感器控制技术以其便捷可靠的优势,广泛应用于电力牵引交流调速系统中,为系统的控制带来了种种便利。在详细分析了几种不同控制策略对系统的影响基础上,针对传统滑模观测器存在抖振的现象,提出基于改进型指数趋近律的模糊滑模控制策略。该方法将转速的误差变量引入电流估算模型中,并对转速反馈信息进行模糊逻辑控制,结合Lyapunov函数设计出转速的自适应律,最后在Simulink仿真平台上验证方案的可行性。结果表明,该方案不但保留了传统滑模优势,而且有效地降低了滑模抖振的影响,满足交流调速系统的要求。更多还原

【Abstract】 No speed sensor control technology with its convenient and reliable advantages,widely used in electric traction AC speed control system,the system control has brought a variety of convenience. Based on the analysis of the influence of several different control strategies on the system,a fuzzy sliding mode control strategy based on improved exponential approximation law was proposed for the existence of buffeting in the traditional sliding mode observer. This method introduced the error variable of the speed into the current estimation model,and carried on the fuzzy logic control to the rotational speed feedback information,combined the Lyapunov function to design the adaptive law of the rotational speed,finally used the Matlab/Simulink platform to verify the program feasibility. The results show that the scheme not only preserves the advantages of traditional sliding mode control,but also effectively reduces the influence of sliding mode chattering phenomenon and satisfies the requirements of AC speed control system.更多还原