基于滑模控制的谐振阻抗型混合有源滤波系统控制技术

Control Technique of the Resonant Impedance Type Hybrid Active Power Filter Based on Sliding Mode Control

基于滑模控制原理,针对矿用谐振阻抗型混合有源滤波系统(RITHAPF)控制技术进行深入研究,并对电网进行无功补偿和谐波抑制。利用开关函数建模法进行系统建模,给出RITHAPF的数学模型。通过对RITHAPF的等效模型的分析推导,提出了RITHAPF系统的收敛和稳定判据。结合离散指数趋近律对离散滑模控制的影响,将连续系统的指数趋近律方法推广到离散系统,证明离散指数趋近律滑模控制对系统摄动和外界干扰依然具有鲁棒性。进一步根据有源电力滤波器的离散数学模型,设计滑模离散数学模型。基于趋近律离散滑模变结构控制设计有源部分的电流跟踪控制器。结果表明,采用滑模控制的谐振阻抗型混合有源滤波器对矿用直流提升系统6 k V母线的无功功率和谐波电流补偿效果良好。

Based on principle of sliding mode control,the mine-used resonant impedance type hybrid active power filter system（ RITHAPF） control technology was further researched,and reactive power compensation and harmonic suppression on power grid were made. The switching function modeling method was adopted to make modeling and propose the mathematical model of RITHAPF. Through the derivation of RITHAPF equivalent model,a convergence and stability criterion was put forward for RITHAPF system. Combining the influence of discrete index reaching law on discrete sliding mode control,the reaching law index of the continuous system was extended to the discrete system,to prove that influence of the discrete index on the system perturbations and external disturbances is still robust. Furthermore,according to the discrete mathematical model of active power filter,the synovial discrete mathematical model is given. The active part current tracking controller was designed based on the reaching law of the discrete sliding mode control. The simulation results showed that the resonant impedance type hybrid active filter based on sliding mode control had a good performance of reactive power and harmonic current compensation for 6 k V DC hoisting system bus.