Novel voltage type multi-level inverter
A multi-level inverter, voltage-type technology, applied in the direction of converting irreversible DC power input to AC power output, can solve the problems of fewer levels and more power switch tubes, and achieves fewer switching times, The effect of increasing the number of output levels and the simple modulation method
Active Publication Date: 2015-07-22
华夏天信智能物联股份有限公司
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Problems solved by technology
[0003] In order to solve the problem of large number of power switch tubes and few levels in the traditional voltage-type multi-level inverter, the present invention provides a new type of voltage-type multi-level inverter, which is different from the existing classic multi-level inverter Compared with the same number of output levels, the new voltage-type multilevel inverter uses less power switch tubes and less isolated drives, and does not need clamping diodes, flying capacitors, etc., and some power switch tubes are in low-frequency working conditions. , fewer switching times, reducing switching losses
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[0021] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0022] Such as figure 1 As shown, a novel voltage-type multilevel inverter of the present invention includes n+1 power supplies and 2n+4 power switch tubes. The power supplies are arranged sequentially from top to bottom. On the right side; the positive pole of the second power supply is on the right side, and the negative pole is on the left side; the positive pole of the third power supply is on the left side, and the negative pole is on the right side; and so on, the polarity direction of the power supply changes alternately; the power switch tubes are arranged on both sides of the power supply, The left power switch tubes are numbered from top to bottom as odd numbers such as "one, three, five, ...", and the right power switch tubes are numbered from top to bottom with even numbers such as "two, four, six, ..."; It also includes a fir...
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The invention discloses a novel voltage type multi-level inverter. When the number of input power sources is expanded from n to n+1, the number of power switch tubes is increased from 2n+2 to 2n+4, wherein n is an integer not smaller than 1, similarly hereinafter; and when voltage of the input power sources is the same, the number of output levels changes from 2n+1 to 2n+3, namely when one power source is added, two power switch tubes and two levels are added. Compared with an existing classic multi-level inverter, the novel voltage type multi-level inverter enables the used power switch tubes and isolation driving to be less, a clamping diode and a flying capacitor and the like are not required, part of the power switch tubes are be in a low-frequency working state, on-off times is little, and switching loss is reduced. According to the novel voltage type multi-level inverter, one-dimensional space vector modulation is adopted, a modulation method is simple, the computing speed is quick, redundant vectors are reasonably utilized, quality of electric energy output by the inverter is improved, and the novel inverter meets the technical requirements of renewable energy and new energy power generation and is suitable for multi-input power source occasions.
Description
technical field [0001] The invention relates to an inverter in the field of DC-AC converters of power electronics technology, in particular to a multi-level inverter with multiple input power supply voltages. Background technique [0002] Inverter refers to a power electronic converter that converts DC power into AC power through the on and off functions of semiconductor power switching devices. Its function is to compare the quality of power obtained from batteries, solar cells, fuel cells, etc. The poor DC raw power is transformed into AC power with high power quality and meeting the voltage and frequency requirements of the user load. The multi-level inverter fits the output waveform by outputting multiple levels, reduces the distortion of the output waveform, and reduces the voltage stress of the power switch tube. Therefore, the multi-level inverter is widely used in medium and large capacity applications. Traditional midpoint clamped <npc>multilevel inverters, ...
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IPC IPC(8): H02M7/49
Inventor 郭小强彭勇钢王立乔
Owner 华夏天信智能物联股份有限公司