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

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...

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

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