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Input current harmonic suppression method of three-stage AC/DC power supply

A technology of DC power supply and input current, applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, electrical components, etc. effect achieved

Active Publication Date: 2021-05-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the heavy calculation of DFT, the system dynamics become very slow and the harmonics are not completely eliminated
[0004] From the above review, it can be concluded that most of the currently developed harmonic suppression methods have major disadvantages such as complex implementation.
In addition, the main reason for poor harmonic suppression performance is the inaccurate extraction of harmonic information, mainly because they rely on SOGI, which usually contains a second-order low-pass filter
Therefore, the signal will inevitably attenuate, and it is difficult to completely get rid of the influence of harmonics

Method used

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  • Input current harmonic suppression method of three-stage AC/DC power supply
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  • Input current harmonic suppression method of three-stage AC/DC power supply

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Embodiment

[0050] The three-stage AC / DC power supply proposed in the present invention mainly satisfies the application scenarios of bidirectional power transmission, electrical isolation, wide range voltage output and high power factor, and adopts a single-phase rectifier in the front stage and an LLC resonant converter in the middle stage A three-level bidirectional isolated AC / DC power supply composed of interleaved Buck converters and the latter stage, such as figure 1 shown. At the same time, in order to improve the output voltage range and output power level, a parallel structure of two identical three-level AC / DC converters is proposed. Among them, the DC bus voltage reference value of the first-stage single-phase rectifier is set to 385V, and the second stage is an isolated LLC resonant converter, which realizes electrical isolation and fixed voltage transmission ratio, and adopts a synchronous rectification modulation strategy to realize natural two-way energy flow . The thir...

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Abstract

The invention discloses an input current harmonic suppression method of a three-level AC / DC power supply. The method comprises the following steps: step 1, extracting a harmonic signal of a certain time by using a mathematical method; step 2, reconstructing harmonic waves according to the detected amplitude and phase information of the harmonic signals; and step 3, suppressing the harmonic wave through a negative feedback loop. According to the method, the harmonic waves can be accurately detected without additional hardware equipment, so that the method is simple, robust and easy to implement. A simulation result verifies the effectiveness and feasibility of the harmonic suppression method provided by the invention.

Description

technical field [0001] The invention relates to a method for suppressing input current harmonics of a three-stage AC / DC power supply. Background technique [0002] AC / DC power supply can provide stable DC power supply for electrical equipment, and has been widely used in various electronic equipment. At present, AC / DC power supplies are developing in the direction of bidirectional, large capacity, high efficiency, high power factor, and wide range output, and have been widely used in new energy power generation, electric vehicles, and lithium battery composition and capacity. However, the input current of the AC / DC power supply is usually affected by the following three factors: (1) The dead zone effect caused by introducing the dead zone time to prevent the upper and lower tubes from being directly connected. (2) A drop in the on-voltage across the switch. (3) Due to the widespread use of nonlinear loads, there are already harmonics in the power grid. These effects cause...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M7/5387H02M7/5395
CPCH02M1/12H02M7/53871H02M7/5395Y02B70/10
Inventor 胡子恒陈壮深但汉兵于晶荣
Owner CENT SOUTH UNIV