Three-phase potential detecting method of low-voltage carrier wave power line for communication

A carrier power line and three-phase power technology, applied to the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve the problems of large noise interference and large signal attenuation, and achieve the effect of accurate data recovery

Inactive Publication Date: 2010-06-09
MIARTECH
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Problems solved by technology

However, the signal transmission on the power line has large signal attenuation and large noise interference, which limits the application of power line carrier communication. Various technical measures must be adopted to improve the communication quality

Method used

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  • Three-phase potential detecting method of low-voltage carrier wave power line for communication
  • Three-phase potential detecting method of low-voltage carrier wave power line for communication
  • Three-phase potential detecting method of low-voltage carrier wave power line for communication

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Embodiment Construction

[0021] In the low-voltage power line carrier communication system, in order to improve the communication quality, the channel characteristics of the power line can be combined to avoid time slots with poor transmission conditions and select time slots with relatively good channel characteristics to transmit information between the sending end and the receiving end , so the transmission of data is discontinuous. In the present invention, the time slots for transmitting data are called data time slots, and the time slots for non-data transmission are called idle time slots. The basis for selecting time slots for data transmission is the zero-crossing position of one of the three-phase power waveforms on the power line, and use this as a reference to periodically allocate data time slots and idle time slots.

[0022] Since the sending end adopts the direct sequence spread spectrum system to spread the data information, and refers to the zero-crossing position of one-phase AC wave...

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Abstract

The invention discloses a three-phase potential detecting method of a low-voltage carrier wave power line for communication, aiming at a communication mechanism that a sending end takes one phase electric wave form in three-phase alternating current on a low-voltage power line as a reference, time slots with bad channel characteristics are avoided, and data are non-continuously sent. The method comprises the following steps of: carrying out relevant operations on received signals of a receiving end and received local spread spectrum code words by the receiving end; selecting relevant peak values according to a relevant operational result and a comparison result of a decision threshold; identifying effective peak values in the relevant peak values and obtaining a relevant value sequence reflecting a relative position relation of a data time slot and a space time slot of the receiving end; respectively carrying out relevant operations on the relevant value sequence and an indication code expressing three phase alternating current electric wave forms; and determining a three-phase reference phase taken as a reference by the sending end according to a relevant value. The method can accurately and effectively detect receiving signals and detect out alternating current phases ought to be taken as a reference so as to be convenient for subsequently processing and recovering data.

Description

technical field [0001] The invention relates to the field of low-voltage carrier power line communication, and proposes a method for detecting three-phase electric phases of low-voltage carrier power lines. Background technique [0002] Low-voltage power line communication has huge market potential and is widely used in power management systems, industrial automatic control systems, intelligent communities and other fields. Using power lines as a communication medium does not require additional communication lines and does not occupy existing spectrum resources. However, the signal transmission on the power line has large signal attenuation and large noise interference, which limits the application of power line carrier communication, and various technical measures must be adopted to improve the communication quality. [0003] The purpose of spread spectrum technology is to solve the communication under strong interference. According to Shannon's theorem, under the premise...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 陈晓雁孙宏
Owner MIARTECH
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