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Method and device for achieving serial communication between controller and power units

A technology of power unit and communication method, which is applied in the direction of optical fiber transmission, can solve the problems of increasing equipment cost and low system stability, and achieve the effect of increasing operating speed, reducing the number of optical fibers, and improving the stability of the whole machine

Inactive Publication Date: 2014-10-01
LIAONING RONGXIN ZHONGTENG TECH
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Problems solved by technology

[0002] Long-distance safe and reliable control is very important in the power electronics industry. At present, the communication between inverters and reactive power compensation product controllers and power units mostly uses optical fiber communication solutions. The communication structure between the controller and power units is configured as a set of transceiver optical fiber modules for the controller. To control a power unit, while increasing the equipment cost, the system stability is not high

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  • Method and device for achieving serial communication between controller and power units

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Embodiment 1

[0024] See figure 1 , the controller has n groups of optical fiber pairs, and can divide the power units into n groups, and each group has N power units.

[0025] The transmitting end of the controller is represented by TX1, TX2...TXn respectively, the receiving end is represented by RX1, RX2...RXn respectively, the first group of power units connected in series are respectively represented by power unit 1, power unit 2...power unit N, and the power The receiving end of the downlink optical fiber module of the unit is represented by RX1-1, RX1-2...RX1-N, and the transmitting end is represented by TX1-1, TX1-2, TX1-(N-1); the receiving end of the upstream optical fiber module of the power unit It is represented by RX2-1, RX2-2...RX2-(N-1), and the sending end is represented by TX2-1, TX2-2...TX2-N;

[0026] The connection relationship is illustrated by taking the optical fiber pair TX1 and RX1 of the controller as an example: the receiving signal RX1-1 of the downlink optical ...

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Abstract

The invention relates to a method for achieving serial communication between a controller and power units. The method includes the following steps of firstly, grouping the power units, wherein power units in each group are connected in series through communication optical fibers; secondly, transmitting a controller command to the power unit at the next level through the intra-group first-level power unit, and completing issuing of the control command; thirdly, transmitting unit state information o the power unit at the previous level through the power unit at the last level, finally returning the unit state information to the controller, and completing uploading of the unit state information. The invention further provides a device for achieving serial communication between the controller and the power units. Compared with the prior art, the method and the device have the advantages that the power units in each group are connected with the controller only through a pair of long optical fibers, near field communication optical fibers between the power units are short, and therefore the number of the optical fibers is greatly reduced, and cost is reduced; control command issuing and unit state information uploading are separately processed, and therefore the running speed of the system is increased, and overall stability is improved.

Description

technical field [0001] The invention relates to the fields of power electronic control such as frequency conversion and reactive power compensation, and in particular to a method and device for serial communication between a controller and a power unit. Background technique [0002] Long-distance safe and reliable control is very important in the power electronics industry. At present, the communication between inverters and reactive power compensation product controllers and power units mostly uses optical fiber communication solutions. The communication structure between the controller and power units is configured as a set of transceiver optical fiber modules for the controller. Controlling a power unit increases the cost of the equipment, and at the same time, the system stability is not high. Contents of the invention [0003] The purpose of the present invention is to provide a serial communication method between the controller and the power unit, which is used to sa...

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Application Information

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IPC IPC(8): H04B10/25
Inventor 郭自勇孙贤大单国明王绪宝杨洋吴然孔祥声杨永飞石华楷
Owner LIAONING RONGXIN ZHONGTENG TECH
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