Single-phase bipolar AC-AC converter topological structure and modulation method thereof

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, reduce switching loss, improve the effect of conversion efficiency

Active Publication Date: 2018-11-30
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 pr

Method used

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  • Single-phase bipolar AC-AC converter topological structure and modulation method thereof
  • Single-phase bipolar AC-AC converter topological structure and modulation method thereof
  • Single-phase bipolar AC-AC converter topological structure and modulation method thereof

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specific Embodiment

[0050] The modulation method of the present invention can have a variety of combined PWM modulation modes, as shown in Table 1:

[0051] Table 1 PWM modulation method

[0052]

[0053] It can be seen from Table 1 that the present invention has three modulation modes regardless of whether it is expected to output a positive voltage or a negative voltage on the load side. Although the values ​​and combinations of modulation ratios vary, the working principles and modulation methods are similar. Therefore, the analysis of the three modulation ratio combinations is carried out by taking the output positive voltage as an example, and will be explained by taking the input voltage as a positive half-wave as an example.

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

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Abstract

The invention discloses a single-phase bipolar AC-AC converter topological structure. The single-phase bipolar AC-AC converter topological structure comprises single-phase system alternating current power supply, a power conversion unit, an LC low-pass filter, a load part and a signal control unit. The output end of the single-phase system alternating current power supply is connected with the input end of the power conversion unit, the power conversion unit includes a positive polarity bridge arm and a negative polarity bridge arm, the output end A of the positive polarity bridge arm and theoutput end B of the negative polarity bridge arm are connected to the input end of the LC low-pass filter, and the output end of the LC low-pass filter is connected to the load part. The topological structure solves the problem of commutation in an existing AC-AC converter topological structure and the problem of only being able to output unipolar voltage or bipolar voltage with narrow range, a PWM modulation strategy is used, only two switching tubes perform opening and closing actions in each switching cycle, the total switching loss is effectively reduced, and the efficiency of the converter is improved.

Description

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

Claims

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Application Information

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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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