Carrier offset-based control method for mid-point voltage balance of multilevel inverter
A multi-level inverter, voltage balancing technology, applied in electrical components, output power conversion devices, conversion of AC power input to DC power output, etc. problem, to achieve the effect of improving the quality of the output waveform and good real-time performance
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[0088] In this embodiment, a three-level inverter circuit is built by using the Simulink tool in MATLAB. After passing through the DC bus capacitor, the DC power is inverted by the three-level circuit to output a three-phase voltage, and a smooth three-phase sinusoidal voltage is output by an EMI filter circuit. The electrical parameter settings in the simulation process are as follows:
[0089]
[0090] Figure 6 is the DC bus capacitor C under the above electrical parameter settings 1 、C 2 The voltage V c1 , V c2 simulated waveform. The control mode of the present invention is added at the time of 0.02s. When the control mode of the present invention is not added, the DC bus capacitance C 1 、C 2 The voltage V c1 , V c2 The average value difference of 30V is about 30V, and the system is in the unbalanced state of midpoint voltage. After adding the control method of the present invention at 0.02s, it can be seen that the system enters a stable state after being adju...
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