Method for controlling distribution network closed loop

A control method and distribution network technology, applied to AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., can solve the problems of reducing the reliability of distribution network power supply and the inability to ensure the safety of loop closing operations, etc. , to achieve the effect of ensuring the interests of users, improving reliability and reducing power failure losses

Active Publication Date: 2010-12-08
ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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AI Technical Summary

Problems solved by technology

[0003] During the loop closing operation, it is necessary to check the steady-state current after the loop closing to avoid equipment overload. In general, the operator can only decide whether the loop can be closed based on experience. Usually, a relatively

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  • Method for controlling distribution network closed loop
  • Method for controlling distribution network closed loop
  • Method for controlling distribution network closed loop

Examples

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[0010] see figure 1 , figure 1 It is a schematic flow chart of the control method of the distribution network loop closure of the present invention.

[0011] According to the principle of circuit superposition, the closed-loop steady-state current of the closed-loop path after the loop-closed is equivalent to the open-loop steady-state current before the loop-closed and the equivalent closed-loop generated due to the potential difference between the two ends of the loop-closed switch after the loop is closed. Superposition of currents.

[0012] by figure 2 For example, before the loop is closed, the switch BRK1 is in the off position, the current of the feeder 1 is i1 (due to the current attenuation of the feeder due to the distribution of the load), and the current of the feeder 2 is i2; after the loop is closed, the switch BRK01 is in the closed position. The original two ends of the BRK01 switch have unequal voltages (the amplitude and phase angle are not the same), so ...

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Abstract

The invention provides a method for controlling a distribution network closed loop. The method comprises the following steps of: performing load flow calculation on a closed loop path to acquire open loop steady-state current of the closed loop path; calculating equivalent closed loop current generated by closed loop operation according to flow data of the closed loop path; superimposing the open loop steady-state current and the equivalent closed loop current, and calculating closed loop steady-state current after closing a loop; comparing the closed loop steady-state current with the preset maximum operating current of the closed loop path; and if the closed loop steady-state current is less than or equal to the maximum operating current, performing the closed loop operation, and if the closed loop steady-state current is more than the maximum operating current, ending off the closed loop operation. The method for controlling the distribution network closed loop can realize safer distribution network closed loop operation, and is helpful for a distribution network dispatcher to perform safe adjustment on a regional electric power network.

Description

technical field [0001] The invention relates to the field of power grid loop closure technology, in particular to a distribution network loop closure control method. Background technique [0002] Due to the continuous development of the national economy, higher requirements are put forward for the reliability of power supply. The mode of two-way power supply and multi-power supply is an effective power supply mode to improve the reliability of power supply in power system distribution network. In this power supply mode, in the event of power outage maintenance, unexpected accidents or load transfer, the appropriate power supply path can be selected through the loop closing operation, thereby ensuring the reliable power supply of the distribution network to users and improving the economy of the distribution network operation. Improve the economic and social benefits of power supply enterprises. Therefore, the loop closing operation is an indispensable link in the operation ...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/06
Inventor 李国号
Owner ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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