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Voltage sag prevention method at the terminal of a substation based on a fast mechanical switch

A mechanical switch and voltage sag technology, which is applied in the direction of AC network voltage adjustment, etc., can solve the problems of being unable to meet the requirements of sensitive load voltage sag tolerance time, unable to implement fast switching for a single sensitive user, etc., to achieve compact structure, occupy The effect of small space and low equipment cost

Inactive Publication Date: 2019-01-22
FUZHOU UNIVERSITY
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Problems solved by technology

The duration of the above voltage sag cannot meet the requirements of the voltage sag withstand time of sensitive loads
To sum up, with the current substation configuration and technical solutions, it is impossible to implement fast switching for a single sensitive user on the substation side

Method used

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  • Voltage sag prevention method at the terminal of a substation based on a fast mechanical switch
  • Voltage sag prevention method at the terminal of a substation based on a fast mechanical switch
  • Voltage sag prevention method at the terminal of a substation based on a fast mechanical switch

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Embodiment Construction

[0030] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0031] Such as Figure 7 As shown, the present invention provides a substation terminal voltage sag prevention and control scheme based on fast mechanical switches, including

[0032] (1) Obtain fault records and power supply topology diagrams of sensitive users;

[0033] (2) Analyze the causes of voltage sag accidents in the past period of time in combination with the system operation mode of sensitive loads and the fault records of the fault recording device, and infer that the location of the fault point that caused the voltage sag is inside or outside the area, Among them, in-area refers to the same level or lower-level system, and out-of-area refers to the upper-level system;

[0034] (3) In view of the frequent occurrence of faults and the fault point causing voltage sag is located in the upper-level system (outside the area) and ...

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Abstract

The invention relates to a voltage sag prevention method of a substation terminal based on a fast mechanical switch. (1) obtaining fault records and power supply topology diagrams of sensitive users;(2) Analyzing the cause of voltage sag accident in the past period of time by combining the system operation mode of sensitive load and fault record of fault recorder, and infer that the fault point causing voltage sag is located in or outside the region; (3) Aiming at the frequent occurrence of faults and the fault point of voltage sag outside the region, a voltage sag control scheme based on fast mechanical switching is proposed to control the voltage sag at the terminal of substation. (4) Aiming at the frequent occurrence of faults and the fault point causing voltage sag is in the region, an active voltage sag prevention scheme based on fast mechanical switch is proposed to solve the problem. cost of a voltage sag treatment device in the method of the invention is low, the voltage sag treatment device is controlled and managed by a contributor power grid company, so that the treatment is easier to implement, and the method has typical guiding significance for solving the voltage sagproblem of the user side.

Description

technical field [0001] The invention relates to a method for preventing and controlling substation terminal voltage sag based on a fast mechanical switch. Background technique [0002] A large number of high-tech industries in modern industrial parks have adopted a large number of precision equipment in order to meet the needs of industrial production automation and increase productivity. The voltage sag / dip is very sensitive. However, the short-circuit fault in the system, the start-up of large motors, the no-load excitation of large transformers, and the switching of large-capacity reactive power compensation capacitor banks are destined to cause voltage sag events, which are inevitable events in the normal operation of power systems. Statistics from Europe and the United States show that more than 80% of user complaints about power quality problems are caused by voltage sags. The contradiction between the inevitable voltage sag event in the power system and the increasi...

Claims

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Application Information

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IPC IPC(8): H02J3/12
CPCH02J3/12
Inventor 张逸王建勋邵振国张嫣李为明
Owner FUZHOU UNIVERSITY
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