AC ice-melting device and method for continuously adjustable multi-branch voltage and frequency of distribution network

A technology of voltage frequency and ice melting method, which is applied in the field of AC ice melting devices, can solve the problems of low machine ice melting efficiency, difficult distribution network multi-branch line ice melting, and limited ice melting range, so as to improve the ice melting efficiency , Increase the effect of ice melting function

Active Publication Date: 2022-07-01
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an AC ice-melting device and method for continuously adjustable multi-branch voltage and frequency in the distribution network, so as to solve the problem of DC ice-melting in the multi-branch lines of the distribution network in the prior art The scope is relatively limited; the efficiency of machine ice melting is relatively low, and it is difficult to melt ice on multi-branch lines of the distribution network at the same time during the ice covering period.

Method used

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  • AC ice-melting device and method for continuously adjustable multi-branch voltage and frequency of distribution network

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Embodiment 1

[0028] The first embodiment of the present invention provides a configuration structure of a variable-frequency AC ice-melting system suitable for flexible substations and continuous adjustment of voltage and frequency. The specific implementation is as follows: figure 1 shown. The premise of the implementation of the present invention is that the B2B-MMC replacement tie switch is installed in the substation, and its common function is power flow regulation. technology. In terms of B2B-MMC access mode, the difference from conventional functions is that a melting ice transformer and ice melting circuit breakers S4 and S5 are connected, so that it can adapt to the complex current situation of multi-branch ice melting in the distribution network. Handle overhead line, branch line or overhead main line. When the AC power with excessive voltage is generated from the ice melting side, the transformer can step down according to the ice melting demand to make the ice melting voltage ...

Embodiment 2

[0030] The second embodiment of the present invention provides a variable-frequency AC ice-melting technology model suitable for multi-branch distribution network and continuous voltage and frequency adjustment. The specific implementation is as follows: figure 2 shown. A control flow of the variable-frequency AC ice-melting technology that is suitable for multi-branch distribution network and continuous voltage and frequency adjustment proposed by the present invention includes the following steps:

[0031] Step 101: determine the online ice melting target route;

[0032] Step 102: close switches S4 and S5, connect to the ice melting system and form an ice melting circuit

[0033] Step 103: B2B-MMC switches to the ice melting mode;

[0034] Step 104: Calculate the current required for melting ice;

[0035] Step 105: Adjust the frequency parameter of the inverter and the transformation ratio of the ice-melting transformer according to the ice-melting current;

[0036] Ste...

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Abstract

The invention discloses an AC ice-melting device and a method for continuously adjustable voltage and frequency of multi-branch distribution network. connection; the output end of the B2B‑MMC converter is connected to the ice melting transformer; the output end of the ice melting transformer is connected to the line to be melted; it solves the problems that there are many branch circuit breakers in the distribution network at this stage, and it is not easy to carry out DC ice melting, etc. Ice-melting efficiency of distribution network lines.

Description

technical field [0001] The invention belongs to the technical field of ice melting of power transmission lines, and in particular relates to an AC ice melting device and a method for continuously adjustable multi-branch voltage and frequency of a distribution network. Background technique [0002] At present, the ice melting method of 10kV overhead line mainly adopts DC ice melting and machine ice melting. Among them, the ice melting range of DC ice melting in the multi-branch line of the distribution network is relatively limited, and it is difficult to effectively melt the other side of the branch line including the transformer. ice. The ice melting efficiency of machine ice melting is relatively low. In view of the current situation of ice melting of distribution network lines, the above-mentioned methods of ice melting are difficult to apply. Therefore, how to ensure large-scale and efficient ice melting in distribution network lines has become a problem of research sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G7/16H02G1/02H02J3/02
CPCH02G7/16H02G1/02H02J3/02
Inventor 班国邦余云雯杨荣袁旭峰吕黔苏马晓红杨旗张露松邹雕许逵杨文勇刘丽
Owner GUIZHOU POWER GRID CO LTD
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