A Discontinuous Pulse Width Modulation Method for Reducing Common Mode Voltage of Indirect Matrix Converter
A matrix converter, common mode voltage technology, applied in the direction of AC power input conversion to AC power output, AC power input conversion to DC power output, electrical components and other directions, can solve the problem of large energy loss, no consideration of common mode voltage suppression, The converter drives the motor system to narrow the speed regulation range and other problems, so as to achieve the effect of reducing the peak value of common mode voltage and the peak value of common mode.
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[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0042] Such as figure 1 As shown, from the topological point of view, the indirect matrix converter (Indirect matrix converter, IMC) can be regarded as composed of a rectification stage and an inverter stage, and the common-mode voltage u generated by it cm Refers to the voltage between the load midpoint n and the reference ground g, when the IMC drives a three-phase symmetrical load, the output common-mode voltage u cm for:
[0043]
[0044] where v Ag , v Bg , v Cg Indicates the three-phase output phase voltage with ground g as the reference point. put v Ag , v Bg , v Cg Expressed as the switching function of the indirect matrix converter, the common-mode voltage u cm The expression is:
[0045]
[0046] Among them, as shown in Fi...
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