四桥臂逆变器控制方法的研究

Study on Control of a 4-leg Inverter

提出一种基于瞬时对称分量法的四桥臂逆变器控制方法,该逆变器在带三相不平衡负载的情况下,可提供三相平衡电压。瞬时分量法可将三相电压和电流分解为瞬时的正序、负序和零序分量,并在各自的参考系中转变为直流信号,再分别加以PI控制。这里介绍了控制器设计的详细推导过程和软件实现。最后,给出基于TMS320F2812控制的实验结果,验证了该方案的正确性和可行性。

The paper presents a control strategy of a 4-leg inverter based on the symmetrical components.The inverter can provide supply of three-phase unbalanced loads with balanced voltage.Symmetrical components of three-phase voltage and current are decomposed into DC quantities which can be controlled by PI in their respective reference systems.This paper describes the detailed derivation of the controller design and software implementation.Finally,the experimental results based on TMS320F2812 are given to verify the validity of the proposed control strategy.