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A preventive control method for power system line overload based on dynamic security domain

A line overload, dynamic safety domain technology, applied in the direction of power network operating system integration, circuit devices, AC network circuits, etc., can solve the problem of the inability to guarantee the safe recovery of overloaded lines, the limited adjustment rate of controllable equipment, and the lack of overload judgment. Based on other issues, the effect of avoiding impact, avoiding damage, and being easy to achieve is achieved.

Active Publication Date: 2022-02-22
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing calculation method of allowable overload time not only causes waste of control resources, but also may cause line damage due to errors and omissions of control targets
[0005] At present, the adjustment rate of controllable equipment in the power system is limited. Can the power adjustment of controllable equipment be used to reduce the overloaded line current to within the long-term allowable current carrying capacity before the line temperature reaches the maximum allowable operating temperature, so as to realize the safe recovery of overload? There is still no basis for judgment
At the same time, if the power adjustment of controllable equipment cannot guarantee the safe recovery of overloaded lines, there is still a lack of corresponding research on how to combine other methods to avoid safety problems caused by line overload

Method used

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  • A preventive control method for power system line overload based on dynamic security domain
  • A preventive control method for power system line overload based on dynamic security domain
  • A preventive control method for power system line overload based on dynamic security domain

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Embodiment Construction

[0075] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0076] Such as figure 1 As shown, the power system line overload prevention and control method based on the dynamic security domain includes the following steps:

[0077] S101. Use the power flow calculation to simulate the opening and closing of each line in the target power system in turn, calculate the power of each line, collect the ambient temperature and line temperature of each line, and perform step S102. Taking the e-th line as an example, calculate the e-th line The power P of the line Le , collect the ambient temperature T of each line a,Le and the line temperature T 0,Le , where e=1,2,…,n L , n L is the number of transmission lines;

[0078] S102. Compare the power of each line with its maximum allowable long-term operating power. If the power of any line is greater than its maximum allowable long-term operating power, it is judged that the ...

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Abstract

The invention discloses a method for preventing and controlling electric system circuit overload based on a dynamic security domain. Through the power flow calculation, the power of each line under power system line interruption is simulated in turn and the overloaded line is screened out; The sending end or receiving end of the load line; calculate the maximum power adjustment amount of the controllable equipment to the overload line, construct the dynamic safety domain of the overload line, and judge the overload line according to the relationship between the power of the overload line and the dynamic safety domain Safety under power adjustment of controllable equipment; if the dynamic safety domain cannot be satisfied, optimize the calculation of the power of the controllable equipment, and change the operation mode of the controllable equipment in advance according to the calculation results, which can maximize the rapid power adjustment capability of the system And line safety margin, effectively avoiding equipment damage caused by line overload, power supply interruption and even large-scale cascading failures.

Description

technical field [0001] The invention relates to the field of power system protection and control, in particular to a method for preventing and controlling the line overload of a power system based on a dynamic security domain. Background technique [0002] The failure and switching of power system components can easily cause the current of the primary transmission line to exceed the long-term allowable current carrying capacity, resulting in overload. After the line is overloaded, the heating power is greater than the cooling power, which makes the temperature of the wire rise. If the temperature exceeds the maximum allowable operating temperature of the line, it is easy to cause a short circuit due to increased arc sag, or cause damage to the wire due to thermal oxidation. At present, it is only possible to rely on relay protection to cut off the overloaded line to prevent the line temperature from exceeding the maximum allowable operating temperature. However, the action...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/14H02J3/38H02H7/26
CPCH02J3/06H02J3/144H02J3/381H02H7/26H02J2203/10H02J2203/20Y04S20/222Y02B70/3225
Inventor 欧阳金鑫龙晓轩
Owner CHONGQING UNIV
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