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Quick Details:

Output power: 15kva

Input Voltage: 192/384VDC

Output Voltage: 380VAC

An important performance of the three-phase inverter is the symmetry of the output voltage. The asymmetry of the output voltage is mainly caused by unbalanced loads.

The symmetrical component method and superposition principle analyze the symmetrical distortion mechanism of the output fundamental voltage and point out the different compensation characteristics of the positive, negative, and zero-sequence components of the output voltage. It shows that the output voltage symmetrical control is not only related to the performance of the controller but also depends on the inverse. The inherent characteristics of the converter circuit structure are proposed, and a method to improve the output symmetry of the inverter is proposed. The simulation and the experiment of the 35kW inverter prototype based on DSP control have verified the theoretical analysis conclusions.

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