In This Project, Power Quality Standards Such AsIEC 61000-3-6, IEC 61000-2-12, EN 50160, And CIGRE WG36-05 Are Fulfilled For Single- And Three-phase Medium-voltageapplications Using Selective Harmonic Mitigation-pulsewidthmodulation In A Cascaded H-bridge (CHB) Converter.Furthermore, The ER G5/4 Power Quality Standard, Whichhas The Strictest Grid Codes At The Medium-voltage Level, Willalso Be Met In The Whole Range Of The Modulation Indices.In Order To Achieve This Goal, A Symmetrical CHB With Variabledc Links Are Employed, While The Converter Has A Low Number Ofswitching Transitions. In Other Words, All Of The Dc Link Voltageshave The Same Voltage, Which Is Dependent On The Modulationindex. Finally, In Order To Validate The Effectiveness And Theapplicability Of The Proposed Method, It Is Verified By Simulationsand Experiments For A Seven-level CHB Converter.

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