Novel power equalization modulation method suitable for cascaded H-bridge multi-level inverter
A multi-level inverter, inverter technology, applied in output power conversion devices, AC power input conversion to DC power output, electrical components and other directions, can solve problems such as shortening power equalization time
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[0025] figure 1 The circuit topology of the CHB inverter is given. This topology includes n H-bridge units. The DC side of each H-bridge unit is a power supply, and the power supply voltage is equal, that is, U d1 =U d2 =…=U dn =E. In addition, the power switching devices of the H-bridge unit use full-control devices such as IGBT and GTO, and the specific device selection is based on comprehensive consideration of factors such as voltage level and switching frequency.
[0026] Each unit of this topology can output three levels of -1, 0 and 1, then the output voltage of each unit can be expressed as
[0027] u oi =xU di (1)
[0028] where u oi is the output voltage of the i-th H-bridge unit, i=1,2,...n, x is the output level of the H-bridge unit, x=-1,0,1, U di is the DC side power supply voltage of the cascaded unit.
[0029] The output voltage u of the topology inverter can be obtained from formula (1) o for
[0030]
[0031] For the convenience of analysis, th...
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