基于三环控制的PWM斩波式交流稳压源研究

Research of PWM Chopper Type AC Regulated Power Supply based on Trinal-loop Control

针对传统AC/DC/AC单相交流稳压源体积大、输入谐波大和功率因数低等问题,该文提出了基于PWM斩波控制的单相交流稳压源,该结构相比于传统控制节省了直流侧电容;LC滤波参数选取综合了其频率特性、功率因数等要素,从滤波器无功容量最小的角度出发设计,优化了滤波器的性能,降低了线路中的谐波含量;为更好的抑制直流电压扰动,提高稳压电源的稳定性,提出采用电感电流内环,输出电压瞬时值中环,输出电压有效值最外环的三闭环控制方案来提高稳压源的动态性能和对负载的适应性。最后对系统搭建Matlab仿真和硬件实验平台,仿真和实验验证了该结构和控制方法的可行性。

In view of these problems, large volume, large input harmonic and Low power factor of Traditional AC/DC/AC single-phase AC regulated power supply. Designed a single-phase AC regulated power supply based on PWM Chopping conversion, The structure is compared to the traditional control saves the DC side capacitor. The LC filter parameters Selection considering multielement such as frequency characteristic, power factor, etc. From the minimum reactive capacity of filter to design the LC filter, which can not only Optimize the filter performance, but reduces the harmonic content in the line; In order to better inhibition the DC voltage disturbance and improve the stability of regulated power supply, The trinal-loop control method that the inductive current inner loop, the output instantaneous voltage central loop and effective value of output voltage outer loop were proposed to Improve the dynamic performance and the load adaptability of the power supply. Finally, using MATLAB simulated the system and lapped hardware platform, the simulation and experimental verified the feasibility of the topology and control method.