Power Loss Distribution And Characterization Of Modular Multilevel Converter For Smart Grid Applications

Fazal Muhammad, Haroon Rasheed

Abstract


The efficiency of the Module multilevel converter (MMC) is strongly dependent on the on-state conduction and switching power losses of the semiconductors of its submodules. The conduction power losses of the submodule of an MMC depend on the load current, duty cycle, and power factor whereas switching power losses depend on switching frequency, dc-link voltages, and load current. Nevertheless, the influence of converter operating points on the overall system efficiency must be taken into account in order to derive a complete picture of the semiconductor losses of the submodule. This paper presents the evaluation of the on-state power loss characteristics of a submodule when the switching frequency, modulation index, and power factor of the system are changed. The power losses of MMC have been presented for the four-quadrant operations i.e. inverter (inductive), rectifier (inductive), rectifier (capacitive), and inverter (capacitive). The evaluation of the power losses has been carried out employing PLECS® to examine the losses of the MMC.


Keywords


MMC; Steady-state power losses; IGBT Losses; Switching power loss; Freewheeling diode; Voltage source converter (VSC).

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v12i3.13067.g8539

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