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Single-phase bipolar ac-ac converter topology and its modulation method

A topology, bipolar technology, applied in the conversion of AC power input to AC power output, climate sustainability, high-efficiency power electronic conversion, etc., can solve the problem of narrow output bipolar voltage range, and achieve the output voltage range. Wide, improve efficiency, improve the effect of reliability

Active Publication Date: 2020-06-30
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a single-phase bipolar AC-AC converter topology and its modulation method, which solves the problem of commutation in the existing AC-AC converter topology and can only output unipolar voltage Or the problem of narrow output bipolar voltage range

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  • Single-phase bipolar ac-ac converter topology and its modulation method
  • Single-phase bipolar ac-ac converter topology and its modulation method
  • Single-phase bipolar ac-ac converter topology and its modulation method

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specific Embodiment

[0050] The modulation method of the present invention can have multiple combinations of PWM modulation methods, as shown in Table 1:

[0051] Table 1 PWM modulation method

[0052]

[0053] It can be seen from Table 1 that no matter whether the load side is expected to output a positive voltage or a negative voltage, the present invention has three modulation methods. Although the values ​​and combinations of modulation ratios are different, the working principles and modulation methods are similar. Therefore, take the output positive voltage as an example to analyze the three modulation ratio combinations, and all will take the input voltage as a positive half-wave as an example for explanation.

[0054] (1) such as image 3 As shown, the modulation ratios are d 1 =d 1x ,d 2 = 0 signal diagram and working process diagram, it can be seen that when the input voltage is positive half-wave, the switch tube S 1 And S 1c Do PWM modulation, switch tube S 2 , S 2c , S 1cp , S 2p And S 2cp...

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Abstract

The single-phase bipolar AC-AC converter topology disclosed by the present invention includes a single-phase system AC power supply, a power conversion unit, an LC low-pass filter, a load part, and a signal control unit; the output terminal of the single-phase system AC power supply is connected to the The input terminal of the power conversion unit is connected. The power conversion unit includes a positive polarity bridge arm and a negative polarity bridge arm. The output terminal A of the positive polarity bridge arm and the output terminal B of the negative polarity bridge arm are connected to the input terminal of the LC low-pass filter, and the LC The output end of the low-pass filter is connected to the load part. The topology disclosed by the present invention solves the problem of commutation in the existing AC-AC converter topology, and the problem of only outputting unipolar voltage or outputting bipolar voltage with a narrow range. The PWM modulation strategy is adopted, so that in each Only two switching tubes are performing switching actions in a conversion cycle, which effectively reduces the total switching loss and improves the efficiency of the converter.

Description

Technical field [0001] The invention belongs to the technical field of electric energy conversion, and relates to a single-phase bipolar AC-AC converter topological structure and a modulation method thereof. Background technique [0002] The continuous increase in the grid-connected capacity of a high proportion of renewable energy has increased the risk of grid voltage exceeding the limit. The inherent intermittent and volatility of renewable energy has exacerbated the problem of low and overvoltage in the grid voltage. However, on the one hand, with the increase of load diversity, some loads require higher accuracy of grid voltage, and voltage fluctuations will bring serious economic losses to this type of sensitive load; on the other hand, voltage fluctuations also limit The ability of the grid to absorb renewable energy. In order to solve the problem of grid voltage fluctuations and meet the voltage requirements of the load side, it is necessary to add a device that can real...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/293H02M1/12
CPCH02M1/12H02M5/293H02M1/0054H02M5/2932Y02B70/10
Inventor 刘闯蔡国伟郭东波单任仲
Owner NORTHEAST DIANLI UNIVERSITY
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