【摘要】 针对三相PWM整流器的非线性特点,并进一步改善系统的起动响应、稳态特性及动态特性,提出一种输入、输出反馈线性化控制与滑模变结构控制相结合的多滑模变结构控制策略。电压外环采用基于指数趋近律的滑模变结构控制策略,确保输出电压稳定并给电流内环提供参考指令电流。在建立三相PWM整流器两输入、两输出仿射非线性模型的基础上,对电流内环进行线性化处理,并利用滑模变结构控制理论设计了电流内环控制器。为了验证系统的可行性,在Matlab/Simulink环境中建立仿真模型,并搭建了15k W的实验样机。仿真与实验结果验证了控制方案的正确性,利用所提控制方案设计的整流器具有系统动态特性好、鲁棒性强和抗干扰能力强等优点,同时也克服了输入、输出反馈线性化需要精确数学模型的缺点。更多还原

【Abstract】 A multi-sliding mode variable structure control strategy is proposed combined input-output feedback linearization control with sliding mode variable structure control, according to the nonlinear characteristics of three-phase PWM rectifier. Voltage outer loop uses sliding mode variable structure control strategy based on the index reaching law, to ensure output voltage stable and provide a reference current instruction to the current loop. After building two-input and two-output affine nonlinear model of three-phase PWM rectifier, the current inner loop was linearized, and the inner current loop controller was designed by sliding mode control theory. Simulation model in Matlab/Simulink and a 15 k W experimental prototype were built. The results verify the control scheme. The rectifier using the proposed control scheme has such advantages as good system dynamic characteristics, strong robustness, strong anti-jamming ability, etc. At the same time, the drawback that input-output feedback linearization requires precise mathematical model is overcome.更多还原