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Frequency-interleaved converter unit and control method

A control method and frequency interleaving technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problem of superimposition of high-order harmonics, and achieve the effects of avoiding resonance, simple and reliable solutions, and balanced working conditions.

Active Publication Date: 2021-09-07
HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a frequency interleaved converter unit and a control method, which can solve the problem of mutual superposition and resonance of high-order harmonics of distributed power electronic converters by preset different carrier frequencies and group switching

Method used

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  • Frequency-interleaved converter unit and control method

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Embodiment

[0054] Example: such as Figure 2A As mentioned above, the present invention provides a frequency interleaved converter unit, the frequency interleaved converter unit is composed of N sub-modules 1 connected in series or in parallel, in this embodiment it is connected in series, the N It is an integer greater than or equal to 2; the sub-module is composed of a converter unit 2 and a control unit; the converter unit includes a power semiconductor device and a DC capacitor to realize DC-AC conversion; in this embodiment, the converter unit The inverter unit includes a DC capacitor and 4 power semiconductor devices, namely S1, S2, S3, and S4, which form an H-bridge circuit.

[0055] The control unit generates a control signal to control the power semiconductor device of the converter unit to turn on and off; the control signal is generated by comparing the carrier wave with the modulation wave; in this embodiment, a sinusoidal modulation method is adopted, and the principle refer...

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Abstract

The invention discloses a frequency-interleaved converter unit and a control method. The invention provides a frequency-interleaved converter unit. The frequency-interleaved converter unit is formed by connecting N submodules in series, wherein each submodule is formed by a converter unit and a control unit; the converter unit comprises a power semiconductor device and a direct current capacitor and realizes direct current and alternating current conversion; the control unit generates a control signal to control on and off of a power semiconductor device of the converter unit; and the control signal is generated by comparing a carrier wave with a modulated wave. The control method of the converter unit is characterized in that the N sub-modules comprise at least M different carrier frequencies, and M is an integer greater than or equal to 2. According to the scheme, the problems of mutual superposition and resonance of higher harmonics of the distributed power electronic converter are solved by presetting different carrier frequencies and packet switching.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a frequency interleaved converter unit and a control method. Background technique [0002] Power electronics constructs signals from the on (1) and off (0) of power semiconductor devices, which can only be reflected in the form of square waves, so only high-frequency signals can be used to cut the desired signal according to the law. These high-frequency signals are carrier waves (usually triangle waves), and the desired signals are modulation waves, such as figure 1 As shown, the modulated wave takes a sine wave as an example. The actual output signal is actually a superposition of a high-frequency signal and a sine wave signal. These high-frequency signals determine the switching frequency of the power semiconductor device on and off, that is, the switching frequency. Therefore, under normal circumstances, the carrier signal used in modulation determines th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 吴国强金国亮严建强刘高明黄志华归宇查振华谢晔源王宇段军杨幸辰
Owner HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD
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