Abstract
Modular multilevel converter (MMC) has broad application prospects in medium voltage scenarios such as DC distribution networks. Medium and low voltage MMC usually use carrier phase shift PWM (CPS-PWM), and the analytical formula of zero crossing point of MMC arm current considering double frequency circulating current component is complex, resulting in the existing MMC loss accurate calculation models are very complex and slow. To solve this problem, this paper proposes a simplified loss calculation model for MMC considering the equivalent of switching devices, which can easily, quickly and accurately calculate converter power losses under different operating conditions without and with circulation suppression, especially reveal the mathematical relationship between converter power losses and its double frequency circulation current component. Finally, based on actual engineering parameters, a comparative analysis of multiple operating conditions is carried out in the MATLAB/Simulink simulation, which verifies the correctness and accuracy of the proposed simplified loss calculation model.
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