Power frequency transformer-free three phase-single-phase voltage transformation device
A technology without industrial frequency transformers and transformer devices, which is applied in the direction of conversion equipment with intermediate conversion to AC, conversion equipment with intermediate conversion to DC, etc., which can solve the problem of equipment and line loss increase, and the three-phase power grid of the converter. Problems such as connection, volume and weight are difficult to reduce, so as to achieve the effect of increasing output voltage level, improving power quality, and not easy to resonate
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[0023] figure 2 As shown, a specific embodiment of the present invention is: a three-phase-single-phase transformer device without power frequency transformer, each phase (A, B, C) of the three-phase power grid passes through the reactor (LA, LB , LC) and then cascaded n (n>1) converters (A1~An, B1~Bn, C1~Cn) to connect, where the output of the positive port a1P of the first converter in phase A is connected to the nth port of phase B The negative port bnN of the first converter of phase B is the same, the output of the positive port b1P of the first converter of phase B is connected to the negative port cnN of the nth converter of phase C, and the positive port c1P of the first converter of phase C is connected through a reactor to the single-phase grid to form a single-phase power supply network. in:
[0024] a. The positive port A1P of the grid side of the first converter A1 of the phase A branch is connected to the phase A of the three-phase grid through the reactor LA,...
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