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Method and device for composite communication of power and communication signal in power system

A technology of power system and communication signal, applied in the direction of distribution line transmission system, etc., can solve the problem that power converter cannot realize power and communication signal well, avoid high-frequency filtering effect, realize simple and low cost Effect

Inactive Publication Date: 2016-08-24
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

Method used

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  • Method and device for composite communication of power and communication signal in power system
  • Method and device for composite communication of power and communication signal in power system
  • Method and device for composite communication of power and communication signal in 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 present invention relates to the technical field of power electronic equipment communication, and provides a method and device for combined power and signal communication in a power system. The PWM modulation signal is generated after the source signal and power compound modulation, and the PWM modulation signal is transmitted in the form of a data frame, and the data frame contains the address of the sender, the destination address and data information; the DC bus current is sampled and decoded The source signal sent to the array communication terminal is obtained through modulation and restoration; the capacitor branch current of the chopper power circuit is sampled, and the source signal sent to the chopper unit is obtained through demodulation and restoration. In the present invention, the PWM pulse signal generated by the PWM modulation method is used as the carrier for the combined transmission of the source signal and power, and the current signal in the detection line is demodulated, and the corresponding source signal is restored, and the power and signal are better realized. composite transmission.

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 Patents(China)
IPC IPC(8): H04B3/54
Inventor 杜海江杨博
Owner CHINA AGRI UNIV
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