新型数字化单相五电平逆变器系统的实现

本文以新型五电平逆变电路为基础，运用重复控制器和状态反馈的控制策略，提出采用降维观测器对电容电流进行检测的方法，系统地说明了整个系统的实现方法和步骤。实验证明，该逆变器输出波形动态性能和稳态性能好，同时也说明经典的波形控制技术能够有效地引入到多电平变换器中，以提高输出电能质量。

Realization of Digital System on a Novel Single-phase Five-level Inverter

In this paper,a novel single-phase five-level inverter only using five power switches is presented to alleviate harmonic components of the output voltage,and its modulation methods are analyzed in detail.The control scheme based on repetitive control with the feedback of the filter capacitor current exerts the advantages of the novel inverter and ensures the system with the well steady-state and dynamic-state characteristic.In order to expediently observe the current through the capacitor,the author presents a dimensionality reduction observer.To verify the controller and the topology,a platform based on DSP is constructed.The experiment results indicate that the traditional technology of the output waveform can be used in the multilevel converter to hold an excellent steady-state and dynamic-state characteristics.When a nonlinear load is added to the system,the crest factor of the current through the load is 1.8 and the(Total Harmonic Distortion,THD) of the output voltage is just 0.8%.