Three-level inverter narrow-pulse elimination and midpoint voltage control method and device
A three-level inverter and narrow pulse technology, which is applied in the field of frequency converters, can solve problems such as easily damaged power switch tubes, system collapse, and difficult control of midpoint voltage, so as to prolong the conduction time, enhance control, and eliminate The effect of narrow pulses
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[0042] For a three-level inverter, when the output voltage is positive, it is marked as P, when the output voltage is negative, it is marked as N, and when the output voltage is 0, it is marked as O. In this way, each phase can output three levels, three There are 27 output combinations on the phase output line, that is, 27 space vectors. The distribution diagram of these 27 space vectors is as follows figure 2 As shown, 27 space vectors are distributed in a total of 6 sectors. The 6 sectors are regular hexagons in the figure, and each sector is a regular triangle, where PPP, NNN, and OOO are zero vectors, and PNN, PPN, NPN, NPP, NNP, PNP are large vectors, PON, OPN, NPO, NOP, ONP, PNO are medium vectors, POO, ONN, PPO, OON, OPO, NON, OPP, NOO, OOP, NNO, POP, ONO is a small vector, and the output voltage of the three-level inverter under low modulation coefficient is close to zero. Therefore, it is obtained by combining the zero vector and the small vector.
[0043] In order to ...
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