One-way LLC resonant converter, frequency conversion control method thereof and IPOS direct-current converter

A resonant converter, DC converter technology, applied in the field of unidirectional LLC resonant converter and its frequency conversion control method, IPOS DC converter, can solve the problem that the voltage stability of the input side of the IPOS DC converter cannot be guaranteed, and the IPOS DC converter cannot Safe and stable operation, complex control methods and other issues, to achieve the effect of ensuring safe and stable operation, reducing design difficulty, and reducing costs

Pending Publication Date: 2021-03-09
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The driving signal of each converter needs to be superimposed on the total output voltage, the control method is more complicated, and it is mainly for the case of the output side connected to the load, only to ensure the stability of the output side voltage of the IPOS DC converter, but not the input side of the IPOS DC converter. The stable voltage of the IPOS DC converter cannot operate safely and stably, and the reliability is poor
It is currently used in the sub-module of the IPOS DC converter because of the large transformation ratio of the transformer, so its design is difficult

Method used

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  • One-way LLC resonant converter, frequency conversion control method thereof and IPOS direct-current converter
  • One-way LLC resonant converter, frequency conversion control method thereof and IPOS direct-current converter
  • One-way LLC resonant converter, frequency conversion control method thereof and IPOS direct-current converter

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Effect test

Embodiment 1

[0057] Embodiment 1 of the present invention provides a unidirectional LLC resonant converter, such as figure 1 as shown, figure 1 middle, T R is a high-frequency transformer, Lr is a resonant inductance, Cr is a resonant capacitor, Lm is a magnetizing inductance, V in is the input voltage of the low-voltage side converter, that is, the input voltage of the unidirectional LLC resonant converter, V O is the output voltage of the high-voltage side converter, that is, the output voltage of the unidirectional LLC resonant converter, Q1-Q4 is the IGBT on the bridge arm of the low-voltage side converter, and D1-D4 is the IGBT on the bridge arm of the low-voltage side converter antiparallel diodes.

[0058] The unidirectional LLC resonant converter provided in Embodiment 1 of the present invention includes a low-voltage side converter, a resonant module, a high-frequency transformer, and a high-voltage side converter connected in sequence;

[0059] The input end of the low-voltag...

Embodiment 2

[0074] Embodiment 2 of the present invention provides a frequency conversion control method for a unidirectional LLC resonant converter, wherein the unidirectional LLC resonant converter is the unidirectional LLC resonant converter in Embodiment 1 of the present invention. The specific process of Embodiment 2 of the present invention Figure such as figure 2 As shown, it specifically includes:

[0075] S201: Determine the frequency disturbance value based on the input voltage of the low-voltage side converter obtained by the previous stage converter and the output voltage of the high-voltage side converter obtained by the DC grid;

[0076] S202: Control the operation of the low-voltage side converter based on the frequency disturbance value and the reference frequency;

[0077] S203: Control the operation of the resonant module and the high-frequency transformer based on the low-voltage side converter.

[0078] The frequency disturbance value is determined based on the input...

Embodiment 3

[0089] Embodiment 3 of the present invention provides an IPOS (Input-Parallel output-series) DC converter, that is, a DC converter with an input parallel output series structure, and the specific structure is as follows image 3 as shown, image 3 in, V in is the input voltage of the low-voltage side converter, that is, the input voltage of the unidirectional LLC resonant converter, V O is the output voltage of the high-voltage side converter, that is, the output voltage of the unidirectional LLC resonant converter, Iin is the input current of the IPOS DC converter, Io is the output current of the IPOS DC converter, and Iin1-Iinn are the resonances of each unidirectional LLC The input current of the converter, Vo1 Von is the output voltage of each unidirectional LLC resonant converter, and Io1-Ion is the output current of each unidirectional LLC resonant converter.

[0090] The IPOS DC converter provided in Embodiment 3 of the present invention includes multiple unidirection...

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Abstract

The invention provides a one-way LLC resonant converter, a frequency conversion control method thereof, an IPOS DC converter and a one-way LLC resonant converter, and is characterized in that the one-way LLC resonant converter comprises a low-voltage side converter, a resonant module, a high-frequency transformer and a high-voltage side converter which are connected in sequence; and the input endof the low-voltage side converter is connected with the output end of a preceding-stage converter, and the output end of the high-voltage side converter is connected with a direct-current power grid.According to the invention, the transformation ratio of the high-frequency transformer can be greatly reduced, the design difficulty of the one-way LLC resonant converter is reduced, the stability ofthe output side voltage and the input side voltage of the IPOS direct-current converter is ensured, the safe and stable operation of the IPOS direct-current converter is ensured, the reliability is high, and the energy loss is reduced.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a unidirectional LLC resonant converter, a frequency conversion control method thereof, and an IPOS DC converter. Background technique [0002] Photovoltaic power generation has been vigorously developed in the power electronics industry due to its environmental protection and abundant reserves. The general photovoltaic power generation system has a two-stage structure, which includes a front-stage converter and a rear-stage converter. The front-stage converter is a DC / DC converter, which is responsible for completing the maximum power point tracking (MPPT) and feeding the voltage into the low-voltage DC bus, and the post-stage converter includes a post-stage DC / DC converter or a post-stage DC / AC converter , the post-converter continues to boost the power of the low-voltage DC bus and transmits it to the high-voltage DC grid or AC grid. How to effectively transmit the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J1/12
CPCH02J1/12H02M3/33569H02J2300/26Y02B70/10Y02E10/56
Inventor 李洋何国庆
Owner CHINA ELECTRIC POWER RES INST
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