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Data modulation method suitable for SRG direct-current microgrid power line data communication

A DC micro-grid and data modulation technology, which is applied in the distribution line transmission system, electrical components, wired transmission system, etc., can solve the problem of small adjustable range of data transmission rate, excessive data signal voltage amplitude, and vulnerable power quality. Impact and other issues

Active Publication Date: 2020-06-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the problem that during the synchronous transmission of data and electric energy, the voltage amplitude of the data signal is too large, the power quality is easily affected, and the adjustable range of the data transmission rate is small, the present invention proposes a SRG DC micro Data Modulation Method for Network Power Line Data Communication

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  • Data modulation method suitable for SRG direct-current microgrid power line data communication
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  • Data modulation method suitable for SRG direct-current microgrid power line data communication

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Embodiment 1

[0067] refer to figure 1 , The DC microgrid system including SRG includes wind farm, SRG system, DC-DC converter, digital controller, high-pass filter circuit, DC bus, DC load, energy storage device and AC grid and other parts.

[0068] Among them, the wind farm, SRG system, DC-DC converter and digital controller are composed of four parts: the data modulation terminal, the DC bus as the transmission channel of energy and signals, the high-pass filter circuit, the DC load, the energy storage device, the AC grid and the digital controller. The controller and other parts form the data demodulation terminal. In the data modulation end, the fan in the wind field is used as the prime mover, and its main shaft is connected with the SRG rotor to drive the SRG to rotate and provide mechanical energy input for the SRG system. SRG system includes SRG main body, power main circuit, control circuit and position signal sensor. SRG is an 8 / 6 four-phase structure, with the characteristics ...

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Abstract

The invention discloses a data modulation method suitable for SRG direct-current microgrid power line data communication. The method comprises the steps of S1 setting a phase current chopping limit value of an SRG; S2 determining value ranges of upper and lower thresholds of current chopping; S3 setting different upper current chopping thresholds and lower current chopping thresholds for the signal data needing to be sent; S4 comparing the magnitude of the phase current of the selected phase in the SRG-containing direct-current microgrid system corresponding to each piece of signal data needing to be sent with the magnitude of the upper and lower thresholds of the corresponding current chopping, and obtaining voltage ripples with fixed frequency according to the comparison result; and S5,obtaining the current chopping frequency corresponding to each piece of signal data needing to be sent. According to the invention, phase current waveforms with different chopping frequencies are formed by selecting different chopping limit values, so that voltage ripples with different frequencies are generated on the output voltage; modulation of different signals is realized; and synchronous transmission of the signals and electric energy is realized while current limiting protection is provided for the system.

Description

technical field [0001] The invention relates to the technical field of signal and energy synchronous transmission, in particular to a data modulation method suitable for SRG DC microgrid power line data communication. Background technique [0002] Traditional data transmission requires dedicated communication channels and is independent of power transmission lines, such as optical fiber communication and wireless communication. For optical fiber communication, data is transmitted through an independent optical cable, which has the advantages of high reliability, strong anti-interference ability and long transmission distance. However, optical fiber communication has strict requirements on modulation devices and transmission cables, which is inconvenient to move, and the cost of installation and maintenance is relatively high. Wireless communication can transmit data without physical connection, and has the advantages of easy installation, strong adaptability, and good scala...

Claims

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Application Information

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IPC IPC(8): H04B3/54
CPCH04B3/542H04B3/546H04B3/548
Inventor 于东升华迎春李克铖叶宗彬程鹤
Owner CHINA UNIV OF MINING & TECH