基于重复控制400Hz逆变电源数字控制系统研究

Research on the Digital Control System for 400 Hz Inverter based on Repetitive Control

针对400Hz逆变电源输出电压波形的畸变问题,采用了重复控制技术解决方案,并根据该控制自身存在的问题,引入了电压有效值外环和电容电流瞬时值内环控制。系统利用重复控制抑制非线性负载下的电压畸变,电流瞬时值反馈控制提高系统的动态响应性能,构成了新型多环控制系统。该控制系统的有效性已在三相6kVA逆变电源实验样机上得到证实。实验结果表明,该方案可保证系统有较快的动态响应、较高的稳态精度和较小的输出电压谐波畸变率。

For the issue of 400 Hz inverter output voltage waveform distortion,the repetitive control technology solution is adopted,the voltage effective value outer loop control and the instantaneous current inner loop control are inducted for the repetitive control＇s own shortcomings.The repetitive control is used to reduce voltage distortion under nonlinear loads,the inner current loop control is used to gain favorable dynamic response process,and constitute a multi-loop control system.The effectiveness of the control system is confirmed in the three-phase 6 kVA inverter power supply,and the experimental results provide that the scheme can ensure the system having fast dynamic response,high steady-state precision and low THD.