Mppt Hybrid Inverter

Its work is the same as that of a single-phase full bridge. The two tubes are turned on at the same time. Their turn-on pairing conditions are: V1V5, V1V6, V2V4, V2V6, V3V4 and V3V5. The pulse width modulation wave is filtered to obtain the following The output waveform UOUT of the three-phase full-bridge inverter in Figure 9. The control method of three-phase full-bridge inverters was mostly three-phase unified control before, which caused the limitation of the three-phase unbalanced load at the output end, and some required the unbalance degree of the three-phase load not to exceed 50%. However, extreme unbalanced three-phase loads often occur. For example, if one phase of the UPS three-phase output voltage is fully loaded and the other two phases are unloaded or lightly loaded, the voltage of the fully loaded phase will decrease, so the inverter control circuit should adjust the power tube according to the phase with the heaviest load. The switching time to make the reduced voltage return to the normal value. As a result of this adjustment, while the heavy-load phase returns to its normal value, the voltage of the other phases at no load or light load is also raised, causing the so-called "three-phase imbalance". For this reason, some UPS manufacturers have redesigned the control circuit and changed the unified control to separate control to improve the original function, but it is still not ideal because the output transformer of the three-phase full-bridge inverter is "D "Connection. This structure organically connects the three bridge arms, which leads to the mutual restraint of the three-phase voltage. In other words, adjusting any one phase will inevitably affect the voltage of the other phases more or less. However, the imbalance can be minimized by careful adjustment.

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