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Using flexible multi-state switch to transfer power flow to realize online ice melting method of distribution network

A distribution network, multi-state technology, used in electrical components, cable installation, overhead lines/cable equipment, etc., can solve the problem of limited length of ice melting lines, low ice melting efficiency, and complicated outage operations and short circuit procedures. and other problems, to achieve the effect of eliminating the safety risk of misoperation, improving the deicing efficiency and convenient control.

Active Publication Date: 2020-07-07
GUIZHOU POWER GRID CO LTD
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  • Description
  • Claims
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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

Method used

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  • Using flexible multi-state switch to transfer power flow to realize online ice melting method of distribution network

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Embodiment Construction

[0018] Specific steps are as follows:

[0019] (1) Take one of the connecting feeder lines as the target line for ice melting;

[0020] (2) Master-slave operation mode of flexible switchgear. Set the control mode of the flexible switchgear directly connected with the target feeder to 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 other feeders to be fed into the target feeder, and the rest of the flexible switchgear The control mode is P-Q control mode;

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

[0022] (4) S...

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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, in particular to a method for using a flexible multi-state switch to transfer a power flow to realize an online ice-melting method for a distribution network. Background technique [0002] At present, the most effective deicing methods for the distribution network are DC deicing, operating mode deicing and AC short-circuit deicing with transformers. The above deicing methods are relatively limited in the deicing range of distribution network lines. Among them, the DC icing of the distribution line needs to stop the transmission line, the line outage operation and short-circuiting procedures are complicated, and the icing efficiency is not high. The icing operation mode is affected by the line load and can only be carried out on some lines, with a transformer for AC Short-circuit melting ice needs to stop the transportation line, and the opposite side needs to manually shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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