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Alternating-current ice melting device and method for continuously adjusting voltage frequency of multiple branches 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 hard-to-distribute network multi-branch line melting, low efficiency of machine-melting ice-melting ice, and limited ice-melting range, etc., to increase the ice-melting function , Improve the efficiency of ice melting

Active Publication Date: 2021-08-06
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • Alternating-current ice melting device and method for continuously adjusting voltage frequency of multiple branches of distribution network
  • Alternating-current ice melting device and method for continuously adjusting voltage frequency of multiple branches of distribution network

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Embodiment 1

[0029] Embodiment 1 of the present invention provides a configuration structure of a variable frequency AC deicing system suitable for flexible substations and continuous regulation of voltage and frequency. The specific implementation is as follows figure 1 shown. The implementation premise of the present invention is that a B2B-MMC replacement contact switch is installed in the substation, and its common function is power flow control. The content contained in the common function is not the content of the present invention. The present invention is a new function and new technology. In terms of B2B-MMC access mode, the difference from conventional functions is that it is connected to an ice-melting transformer and ice-melting circuit breaker S4, S5, so that it can adapt to the complex status of multi-branch ice melting in the distribution network. Handle overhead lines, branch lines or overhead main lines. When the ice-melting side inverts the AC power with too high voltage...

Embodiment 2

[0031] Embodiment 2 of the present invention provides a variable-frequency AC ice-melting technology model suitable for multi-branch distribution network and continuous adjustment of voltage and frequency. The specific implementation is as follows figure 2 shown. A control flow of frequency conversion AC ice-melting technology proposed by the present invention, which is suitable for multi-branch distribution network and continuous adjustment of voltage and frequency, includes the following steps:

[0032] Step 101: Determine the online ice-melting target line;

[0033] Step 102: Close the switches S4 and S5, connect to the ice-melting system and form an ice-melting circuit

[0034] Step 103: B2B-MMC switches to ice melting mode;

[0035] Step 104: Calculate the current required for ice melting;

[0036] Step 105: Adjust the frequency parameter of the inverter and the transformation ratio of the ice-melting transformer according to the ice-melting current;

[0037] Step 10...

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Abstract

The invention discloses an alternating-current ice melting device and method for continuously adjusting the voltage frequency of multiple branches of a distribution network. The alternating-current ice melting device comprises a B2B-MMC converter; the input end of the B2B-MMC converter is connected with an AC bus end; the output end of the B2B-MMC converter is connected with an ice melting transformer; and the output end of the deicing transformer is connected with a line to be deiced. The problems that at the present stage, the number of branch breakers of a distribution network line is large, and direct-current ice melting is not easy to carry out are solved, and the ice melting efficiency of the distribution network line is improved.

Description

technical field [0001] The invention belongs to the technical field of deicing of power transmission lines, and in particular relates to an AC deicing device and method for continuously adjustable multi-branch voltage frequency of a distribution network. [0002] technical background [0003] At present, the ice melting methods of 10kV overhead lines mainly adopt DC ice melting and machine ice melting. Among them, the range of DC ice melting in multi-branch lines 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, and it is difficult to melt ice on multi-branch lines of the distribution network at the same time during the ice covering period, requiring a large number of cooperative operators. For the current situation of ice melting of distribution network lines, the above ice melting methods are difficu...

Claims

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Application Information

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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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