Method and apparatus for realizing composite communication of power and communication signals in electric power system

A power system and communication signal technology, applied in the direction of distribution line transmission system, etc., can solve the problem that the power converter cannot better realize power and communication signals, and achieve avoidance of high-frequency filtering, low cost, detection and resolution Adjust the effect of convenience

Inactive Publication Date: 2014-12-03
CHINA AGRI UNIV
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Problems solved by technology

[0017] The technical problem to be solved by the present invention is to solve the problem that the complex communication of power and communication signals cannot be better realized between power converters in a multi-group series-parallel cascaded array power system

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  • Method and apparatus for realizing composite communication of power and communication signals in electric power system
  • Method and apparatus for realizing composite communication of power and communication signals in electric power system
  • Method and apparatus for realizing composite communication of power and communication signals in electric power system

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Embodiment Construction

[0060] The power and communication signal composite communication method in the power system provided by the present invention belongs to a form of frequency division composite transmission, and is mainly applied to a cascaded array power system (such as a photovoltaic array power generation system) in which multiple groups are connected in series and parallel. Refer to the FSK modulation method to modulate the source signal, that is, use different high-order switching frequencies to represent the code elements "1" and "0" of the source signal and the "no symbol" situation without source signal transmission, and use PWM modulation In this way, the source signal and power are compositely modulated to generate a PWM modulation signal, and then the current of the capacitor branch of the chopper unit and the current on the DC bus are sampled, and the corresponding source signal is obtained by demodulation and restoration from the sampling results, and finally Realize the communicat...

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Abstract

The invention relates to the technical field of communication of electric power devices and electronic devices, and provides a method and apparatus for realizing composite communication of power and communication signals in an electric power system. The method comprises the following steps: modulating source signals by reference to an FSK modulation mode, and generating PWM signals after composite modulation of the source signals and power by use of a PWM technology, wherein the PWM signals are transmitted in the form of data frames, and the data frames comprise a sender address, a destination address and data information; sampling DC bus currents, and obtaining the source signals sent to an array communication terminal through demodulation and reduction; and sampling capacitance branch currents of a chopper power loop, and obtaining the source signals sent to a chopper unit through demodulation and reduction. According to the invention, the PWM pulse signals generated by use of the PWM mode are taken as carriers for composite transmission of the source signals and the power, demodulation is carried out through detecting current signals in a line, and the corresponding source signals are obtained through reduction, such that composite transmission of the power and signals is quite well realized.

Description

technical field [0001] The invention relates to the technical field of power electronic equipment communication, in particular to a method and device for composite communication of power and communication signals in a power system. Background technique [0002] Power electronic equipment has been widely used in all levels of power systems, such as active filters, reactive power compensation equipment, power converters, etc. Among them, the power converter is used to adjust different loads to operate at rated power without being affected by grid fluctuations. For power converters, the basic control technology is Pulse Width Modulation (PWM), and the modulated pulse sequence controls the output power by controlling the on and off of the switch tube in the power converter. [0003] Coordinated operation of power converters requires reliable information communication as a guarantee. According to whether the communication line is combined with the power line, it can be divided ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54
Inventor 杜海江杨博
Owner CHINA AGRI UNIV
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