采用数字控制的400Hz大功率逆变电源  

400 Hz High-power Voltage-source Inverter With Digital Control

作　　者：李子欣[1] 王平[1] 李耀华[1] 朱海滨[1] 胜晓松[1] 高范强[1] 

机构地区：[1]中国科学院电工研究所,北京市海淀区100190

出　　处：《中国电机工程学报》2009年第6期36-42,共7页Proceedings of the CSEE

摘　　要：详细分析数字控制对400Hz大功率逆变电源特性尤其是计算延时对电感电流反馈环或电容电流反馈环带宽的影响。分析表明数字控制使得电流反馈环带宽大大减小,逆变电源无法抑制由于死区时间以及非线性负载等非线性因素产生的低次谐波,降低了电源的性能。分析其它采用电压、电流双闭环数字控制的400Hz逆变电源必须采用幅值环作为外环控制的原因,并指出其存在的缺点。为了获得高性能的控制效果,提出一种基于谐振控制器的新型的单电压环控制策略,并分析现有文献中谐振控制器的不同离散化方法之间的关系,进而提出谐振控制器数字化实现的一种更为直接的方法。所提出的数字化控制方法简单易行,可以实现特定谐波的完全消除,即便在定点数字信号处理器(digital signal processor,DSP)上也能很好地实现。在16位定点DSP控制的三相90kVA组合式400Hz逆变电源上的线性负载以及非线性负载实验表明,该方法正确可行,性能优良。The influences of digital control on 400Hz high power voltage-source inverters were analyzed. Analyses show that computation delay in digital control leads to a narrow bandwidth of the inductor current loop or capacitor current loop. So the low order harmonics introduced by some nonlinear factors, such as the dead time, the nonlinear loads, can not be suppressed by the inverter and the performance of the source is worsen. The paper analyzes the reason why the outer amplitude loop must be adopted in other double-loop based control methods and points out the drawbacks of this type of approach. A new resonant controller based single-loop method suitable for digital control was proposed. Test results of a fixed-point 16-bit DSP controlled three-phase 90 kVA 400 Hz inverter with linear or nonlinear loads show the performance of the new scheme is satisfactory.

关 键 词：数字控制 400Hz电源 大功率 逆变电源 谐振控制器 

分 类 号：TM46[电气工程—电器]