A Method for Transient Stability Fluctuation of Reclosing Power System

Abstract

The invention discloses a transient state stability fluctuation method of a reclosing power system. The method comprises the following steps: calculating the measure of reclosing time under the condition of some fault according to the topology fixing information of a reclosing automatic setting system and in light of the dynamic safety domain; obtaining the degree of instability of fault line reclosing under the fault in the whole time domain; determining the stability of the reclosing power system according to the degree of instability; outputting the reclosing time; transmitting to a control terminal through an optical cable to control the reclosing action. According to the method, the reclosing time setting method on the basis of the practical dynamic safety domain is carried out to clearly describe the permanent fault reclosing time interval which enables the system to be stable.

Description

technical field [0001] The invention relates to the fields of electrical equipment and electrical engineering, in particular to a transient stability fluctuation method of a reclosing power system. Background technique [0002] The reclosing device is an automatic device that automatically turns on the circuit breaker that has been tripped due to a fault. Power system operation experience shows that most of the faults of overhead lines are "instantaneous", and the permanent faults are generally less than 10%. Reclosing is an important way for the power system to quickly troubleshoot and restore normal operation. On the one hand, the traditional fast reclosing method cannot flexibly match the arc-extinguishing time, so that some temporary faults cannot be successfully reclosed, and rapid reclosing on permanent faults will cause a great impact. [0003] Existing research results show that under permanent faults, the faster the recloser is not, the better it is to suppress th...

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Problems solved by technology

[0005] (1) When reclosing is caused by a permanent fault, on the one hand, the power system will be impacted by the short-circuit current again, which may cause the swing amplitude of the power system to increase after reclosing, and may even cause the power system to lose stability; on the other hand, the relay The protection makes the circuit breaker open again, and the circuit breaker cuts off the short-circuit current twice consecutively in a short period of time, which deteriorates the working condition of the circuit breaker

[0006] (2) The use of automatic reclosing on the high-voltage outlet line of large thermal power plants may stimulate the torsional vibration of the shafting of the turbogenerator, resulting in the fracture or damage of some parts of the shafting or couplings

However, the current automatic reclosing switch in the power system cannot distinguish whether the fault is permanent or transient. If the line fault is transient, the reclosing is successful; Hazards in the event of a short circuit during normal operation

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