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和SPWM控制相比,空间矢量调制(SVM)技术对直流母线电压的利用率高,适合数字实现。本研究项目是为铁道客车空调机组供电的电压SVM控制变频电源,变频器采用开环起动和稳态电压闭环控制,讨论了恒定V/F控制和电压闭环调节的实现原理,在查表法的基础上提出“复用空间矢量法”。该方法可以提高开关频率,降低低频输出电压的失真度并节省存储空间。通过系统辨识建立了电压空间矢量调制变频器的模型,设计了数字电压调节器。仿真和40kVA原理样机的实验测试结果证明所提控制方案可行。
Compared to SPWM control, Space Vector Modulation (SVM) has high utilization of DC-link voltage and is suitable for digital implementation. The research project is a voltage SVM control variable frequency power supply for railway passenger car air conditioning unit. The inverter adopts open-loop start-up and steady-state voltage closed-loop control. The realization principle of constant V / F control and voltage closed-loop regulation is discussed. Based on the proposed “reuse space vector method.” This method can improve the switching frequency, reduce the distortion of low-frequency output voltage and save storage space. Through the system identification, a model of voltage space vector modulation inverter is established and a digital voltage regulator is designed. The experimental results of simulation and 40kVA prototype show that the proposed control scheme is feasible.