Neutral point balancing circuit of three-level inverter, control method and power electronic equipment
A three-level inverter, balanced circuit technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the three-level inverter midpoint voltage imbalance, etc. problems, to achieve the effect of reducing the cost of inductance and improving competitiveness
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Embodiment 1
[0026] Such as figure 1 As shown, the embodiment of the present application provides a midpoint balance circuit of a three-level inverter, and the three-level inverter 10 includes a positive DC bus P, a negative DC bus N, and a midpoint O of the DC bus; it needs to be explained It is noted that the specific circuit structure of the three-level inverter 10 is not limited here, for example, it may be T-shaped three-level or I-shaped three-level.
[0027] The midpoint balance circuit 20 includes an inverter bridge circuit and a coupled inductor;
[0028] The inverter bridge circuit includes n bridge arms, and the coupled inductor has n input terminals and n output terminals; n is an integer greater than 1;
[0029] The n bridge arms are connected in parallel between the positive DC bus and the negative DC bus, and all output terminals of the n bridge arms are respectively connected to the n input terminals of the coupled inductor in one-to-one correspondence, so The n output en...
no. 2 example
[0063] An embodiment of the present application provides a control method for a mid-point balance circuit of a three-level inverter. For the three-level inverter and the mid-point balance circuit, reference may be made to the foregoing content, and details are not repeated here.
[0064] The methods include:
[0065] According to the midpoint voltage of the DC bus of the three-level inverter, the wave voltage of the inverter bridge circuit is determined.
[0066] In this example, the generated voltages of the n bridge arms of the inverter bridge circuit are the same, but the carrier phases are sequentially shifted by 360° / n.
[0067] Since the wave voltage of the neutral point balance circuit is the same, but the carrier phase is shifted by 360° / n respectively, the fundamental wave current output by each bridge arm of the inverter bridge circuit is the same, but the phase of the subharmonic current of the carrier frequency is different. The fundamental wave currents passing t...
no. 3 example
[0069] An embodiment of the present application provides a power electronic device, and the power electronic device includes a midpoint balance circuit of a three-level inverter. For the three-level inverter and its mid-point balance circuit, reference may be made to the aforementioned content, and details are not repeated here.
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