摘要
基于数字控制的超高速电机驱动系统具有运行速域宽、载频比低的特性,采用传统无差拍控制已不能保证其电流环在高速区域的控制性能及稳定性。针对上述问题,通过在Z域构建超高速电机电流环复矢量等效模型,分析了低载频比下等效延迟项对无差拍控制系统稳定性的影响;推导了无差拍控制近似离散模型误差及参数失配误差解析式并对其定量分析。提出一种适用于超高速电机低载频比运行的改进型方法:一方面采用基于离散滑模观测器的电压前馈补偿方案,有效加强了系统抗模型误差和参数扰动的鲁棒性;另一方面将观测器控制函数与扰动量引入电流预测模型,并对时间延迟附加项修正补偿,有效消除了系统延迟的综合影响。最后,仿真和实验验证所提理论及方法的正确性。
The ultra-high-speed motor drive system based on digital control has the characteristics of wide operating speed range and low-carrier frequency ratio.Using traditional deadbeat control can no longer ensure the control performance and stability of its current loop in the high speed region.In order to solve the above problems,the influence of the equivalent delay term on the stability of the deadbeat control system at low-carrier frequency ratio was analyzed by constructing a complex vector equivalent model of the current loop of an ultra-high-speed motor in the Z domain.The analytical expressions of approximate discrete model error and parameter mismatch error for deadbeat control were derived and analyzed quantitatively.An improved method for low-carrier frequency operation of ultra-high-speed motors was proposed.A voltage feedforward compensation scheme based on discrete sliding mode observers was adopted to enhance the robustness of the system against model errors and parameter disturbances.The observer control function and disturbance were introduced into the current prediction model,and the additional term of time delay was corrected and compensated,which effectively eliminates the comprehensive impact of system delay.Finally,the proposed theory and method were verified by simulation and experiments.
作者
王晓琳
李紫佳
李正龙
严廷雄
WANG Xiaolin;LI Zijia;LI Zhenglong;YAN Tingxiong(School of Automation,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2023年第4期55-63,74,共10页
Electric Machines and Control
基金
国家自然科学基金(52177048)
江苏省自然科学基金(BK20201297)。
