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Control method of high-frequency isolation type variable-topology AC-DC converter

A high-frequency isolation and control method technology, which is applied in the control/regulation system, the conversion of DC power input to DC power output, and the conversion of AC power input to DC power output, etc., can solve the problem of low apparent power utilization, high cost, Large volume and other problems, to achieve the effect of reducing cost and loss, improving utilization rate, and improving system efficiency

Active Publication Date: 2019-06-21
哈工大(张家口)工业技术研究院 +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-frequency isolated variable topology AC-DC converter to solve the problems of large volume, high cost, and low apparent power utilization of the existing high-frequency isolated AC-DC converter control system device control method

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  • Control method of high-frequency isolation type variable-topology AC-DC converter

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specific Embodiment approach 1

[0031] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, the control method of the high-frequency isolation variable topology AC-DC converter described in this embodiment, the high-frequency isolation variable topology AC-DC converter includes an AC-side LC filter, a matrix converter, a high-frequency Frequency isolation transformer, first bridge converter, second bridge converter, two single-pole double-throw switches and DC side LC filter;

[0032] The two output terminals of the LC filter on the AC side are respectively connected to the two input terminals of the matrix converter, and the two output terminals of the matrix converter are respectively connected to the two ends of the first winding of the high-frequency isolation transformer; the first bridge converter and the The structure of the second bridge converter is the same, the two input terminals of the first bridge converter are respectively connected to t...

specific Embodiment approach 2

[0034] Specific implementation mode two: the following combination figure 1 and figure 2 Describe this embodiment, this embodiment will further explain Embodiment 1, the specific process of setting the output power closed-loop control and setting the output voltage equalization algorithm of the two bridge converters is as follows:

[0035] S1. Set the high-frequency ladder wave, and collect the AC side voltage V at the initial moment of each high-frequency ladder wave g , the output voltage V of the first bridge transformer C1 , The current i of the first bridge transformer s1 , The output voltage V of the second bridge converter C2 , the current i of the second bridge converters2 , the DC output voltage V of the LC filter on the DC side o , The current i of the LC filter on the DC side o ;

[0036] Set the phase-locked loop to collect the instantaneous phase angle of the AC side voltage;

[0037] Set the transmission reference power P*;

[0038] Set the nominal value...

specific Embodiment approach 3

[0048] Specific implementation mode three: the following combination figure 1 and figure 2 This embodiment will be described. This embodiment will further explain the second embodiment. The first bridge converter and the second bridge converter of the high-frequency isolation variable topology AC-DC converter have the same structure, including inductors, four Power switches and capacitors;

[0049] Set the high-frequency ladder wave as described in S1, and collect the AC side voltage V at the initial moment of each high-frequency ladder wave g , the control method of the four power switches is:

[0050] At the beginning of each high-frequency step wave, if V g If the polarity is greater than zero, the two power switches in the upper left and lower right corners are turned on, and the two power switches in the lower left and upper right corners remain off;

[0051] After half a cycle of the high-frequency ladder wave, the two power switches in the upper left corner and the...

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Abstract

The invention relates to a control method of a high-frequency isolation type variable-topology AC-DC converter, belongs to the technical field of electric energy conversion, and aims to solve the problem that the control system of the existing high-frequency isolation type AC-DC converter is large in size, high in cost and low in apparent power utilization rate. According to the control method ofthe high-frequency isolation type variable-topology AC-DC converter, the output power closed-loop control is set by controlling two single-pole double-throw switches to be in serial connection or parallel connection according to the relation between the actual value of the direct current side voltage and the rated value, two bridge-type converter output voltage balancing algorithms are set, and current-sharing control of the two bridge-type converters in the parallel connection mode is realized, and voltage-sharing and current-sharing control in the serial connection mode is achieved. The method is used for electric energy conversion.

Description

technical field [0001] The invention relates to a control method of a high-frequency isolation type variable topology AC-DC converter, belonging to the technical field of electric energy conversion. Background technique [0002] The high-frequency isolated AC-DC converter realizes electrical isolation between the AC power grid and the DC source or load through a high-frequency isolation transformer. It has a series of advantages such as small size, light weight, and high integration. It is used in energy storage systems, photovoltaic power generation systems, fuel Fields such as battery power conversion systems have broad prospects for development. [0003] In energy storage systems based on high-frequency isolated AC-DC converters and photovoltaic power generation systems, the terminal voltages of batteries, supercapacitors, and photovoltaic cells connected to the DC side will vary in a wide range. Since the power is equal to the terminal voltage Therefore, when the termin...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M3/335
Inventor 吴凤江王贵忠侯英伟李洪波张国庆于文斌郭志忠
Owner 哈工大(张家口)工业技术研究院
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