Method for realizing online ice melting of power distribution network by transferring power flow through flexible distribution switch

An ice-melting method and technology of power distribution network, applied in the direction of electrical components, cable installation, overhead line/cable equipment, etc., can solve the problem of limited length of ice-melting line, low ice-melting efficiency, outage operation and short-circuit procedure It can eliminate the safety risks of misoperation, improve the deicing efficiency, and facilitate the control.

Active Publication Date: 2019-04-16
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method of using a flexible multi-state switch to transfer the power flow to realize the online ice melting method of the distribution network, so as to solve the problem of complex line outage operation and short-circuiting procedures in the existing technology for the ice melting of the transmission line. Technical problems such as low ice efficiency and limited length of ice-melting lines

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  • Method for realizing online ice melting of power distribution network by transferring power flow through flexible distribution switch

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Embodiment Construction

[0018] Specific steps are as follows:

[0019] (1) Take one of the feedback feeders as the target line for melting ice;

[0020] (2) Master-slave operation mode of flexible switchgear. Set the control mode of the flexible switch device directly connected to the target contact feeder to the DC constant voltage control mode, which has two functions: one is to stabilize the DC bus voltage, and the other is to facilitate the active power of the remaining feeders to feed into the target feeder, and the remaining flexible switch devices The control mode is PQ control mode;

[0021] (3) Since the flexible switch can flexibly control the power flow and even reverse the direction, adjust the main controller to keep the total load of each feeder unchanged, reduce the active power output by other contact feeders, and increase the active power of the target feeder to ensure Above line current, until the target feeder achieves overcurrent ice melting;

[0022] (4) Choose another feeder as the ta...

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Abstract

The invention discloses a method for realizing online ice melting of a power distribution network by transferring power flow through a flexible distribution switch. The method comprises the followingsteps: step 1, selecting any one connection feeder line in the power distribution network as an ice melting target line; step 2, setting the control mode of the flexible switch device directly connected with the ice melting target line as a direct-current constant-voltage control mode, and setting the control modes of the remaining flexible switch devices as P-Q control modes; and step 3, adjusting a main controller of the power distribution network, keeping the load sum of the feeders unchanged, reducing the active power output by the connection feeders of the non-ice-melting target line, andincreasing the active power of the ice-melting target line to be higher than the line holding current until the ice-melting target line realizes over-current ice melting. The technical problems thatline outage operation and short circuit procedures are complex, the ice melting efficiency is not high, and the ice melting line length is limited in the power transmission line ice melting process inthe prior art are solved.

Description

Technical field [0001] The invention belongs to the ice melting technology of power transmission lines, and particularly relates to a method for realizing online ice melting of a distribution network by using a flexible multi-state switch to transfer power flow. Background technique [0002] At present, the most effective methods of ice melting in the distribution network are DC ice melting, operating mode ice melting and AC short-circuit melting ice with transformers. The above-mentioned ice melting methods have relatively limited ice melting range in distribution network lines. Among them, the DC ice melting of the distribution line needs to stop the transportation power line, the line shutdown operation and short-circuiting procedures are complicated, the ice melting efficiency is not high, the operation mode ice melting is affected by the line load, and it can only be performed on some lines, with a transformer for AC Short-circuit ice melting requires firstly the need to cut...

Claims

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Application Information

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IPC IPC(8): H02G1/02H02G7/16
CPCH02G1/02H02G7/16
Inventor 班国邦谢百明谈竹奎马晓红
Owner GUIZHOU POWER GRID CO LTD
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