Control method for combined selection and shedding of feeder loads in overload process of power line or power transformer

A technology for power transformers and power lines, applied in AC network voltage adjustment, power network operating system integration, information technology support systems, etc., can solve problems such as large user loads, inaccurate total load shedding, and large overcuts , to achieve the effects of fast load selection, small overcut, and reduced load loss

Inactive Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The total amount of load shedding by these two methods is inaccurate. In order to reliably eliminate the overload operation state of the equipment, a large amount of over-cutting is generally required, and

Method used

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  • Control method for combined selection and shedding of feeder loads in overload process of power line or power transformer
  • Control method for combined selection and shedding of feeder loads in overload process of power line or power transformer
  • Control method for combined selection and shedding of feeder loads in overload process of power line or power transformer

Examples

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Embodiment 1

[0027] The following takes Ningxia Zhongwei's main transformer overload area intelligent joint switching system as an example to illustrate:

[0028] 1. System introduction:

[0029] The Ningxia Zhongwei main transformer overload area intelligent joint switching system is based on the actual needs of Ningxia Zhongwei, in order to avoid the 330kV main transformer accident overload endangering the safety of the main transformer. The system consists of a 330kV main station - Zhongwei Substation, and four 110kV substations - Hongshankou Substation, Meili Substation, Liyuan Substation and Weibei Substation. Its system architecture is as image 3 shown.

[0030] The main functions of the main station Zhongwei changer:

[0031] ●Connect to the three-phase voltage and three-phase current of three main transformers;

[0032] ●Two-phase current connected to 4 circuits of 110kV feeder;

[0033] ●Receive the uploaded 35kV feeder current from 4 substations;

[0034] The main function...

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Abstract

The invention relates to a control method for combined selection and shedding of feeder loads in the overload process of a power line or a power transformer. The control method is characterized by including the following steps that firstly, according to the different overload degrees of the power line or the power transformer, five rounds of load shedding are set; secondly, the overload starting condition of the power line or the power transformer is defined; thirdly, the overload action selection and shedding condition of the power line or the power transformer is defined; fourthly, overload action selection and shedding of the power line or the power transformer are executed. The novel control method for combined selection and shedding of the feeder loads is used for reducing load losses as much as possible while continuous power supply to important users is guaranteed and guaranteeing safe and stable operation of a power grid. According to the control method, multiple independent round levels are set according to the magnitude of currents and overload time delay of the power line or the power transformer, a fixed current value and a fixed time delay value which are independent are set for each round level, the fixed values are set in an inverse time limit mode, and load selection and shedding are accelerated when overload is severe.

Description

technical field [0001] The invention relates to a control method for combined selection and cut-off feeder load of a power line or a power transformer. Background technique [0002] Some substations in the power system have heavy loads, and the capacity of the primary equipment of the power line (or transformer) is relatively high. When one of the power lines (or transformers) running in parallel trips due to a fault, it will cause the untripped power lines (or transformers) to run in overload. Long-term overload operation will cause damage to the power line (or transformer), and measures must be taken to eliminate the primary equipment overload state. [0003] Currently, there are two methods of overload load shedding: shedding loads according to the time-delay and stage-by-wheel shedding and shedding loads in one time according to the inverse time limit, or the total amount of load shedding is accumulated according to the historical load curve of the feeder. The total am...

Claims

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Application Information

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IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 罗强韩力梁俊赵荣殷学农邓拓吴良方拓守辉张丹杰王强强陈海荣桑士振周文平
Owner STATE GRID CORP OF CHINA
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