Three-bus four-section standby power automatic operation device self-adaption in service and out of service control method

Abstract

The invention discloses a three-bus four-section standby power automatic operation device self-adaption in service and out of service control method. The method comprises the steps of before standby power automatic operation device is in service under a voltage of 10 kV, calculating the transformer load condition after the spare power automatic switching is performed the by using an algorithm of summation of effective values of bilateral current, so that the problem that a transformer is overloaded after automatic operation is solved; simultaneously providing an intelligent equalization load function of the standby power automatic operation device in a three-bus four-section connecting method, choosing whether the equalization load function is performed or not intelligently according to a load situation of an inlet wire, and improving the usage efficiency of the transformer; and monitoring and calculating the load situation in real time after the standby power automatic operation device is in service, and load intertripping is performed automatically when the transformer is overloaded, so that the safety of the transformer is guaranteed. According to the method, logical data acquisition quantity of a whole action is small, a device is convenient to implement and the engineering popularization applicability is good.

Description

technical field [0001] The invention relates to the technical field of electric energy control for rational distribution of power on a power bus, in particular to a self-initiating and self-adaptive switching control method for three-bus four-segment backup and automatic switching applied to a 10kV AC voltage level. Background technique [0002] With the development of society and economy, power users have increasingly higher requirements for power quality, among which the reliability of power supply is mentioned as an important position. The scale and transmission capacity of modern power systems are also increasing rapidly. The actual operation of the power grid is often affected by various external disturbances and the performance of the system's own equipment, and even partial system failures occur, resulting in interruption of power supply. Standby automatic switching is an important equipment to ensure the reliability of power supply in the power system. Whether it can...

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Problems solved by technology

[0003] The standby automatic switch on the 10kV bus side of the AC power grid often manually decides whether to control the standby automatic switch according to the load situation, resulting in the failure of the backup automatic switch in the substation to respond in real time, reducing the reliability of the 10kV bus's power supply

Due to the heavy power supply load of the substation, the 10kV busbar of the 110kV substation with three main transformers widely adopts the three-busbar four-section wiring method. The outstanding advantages of this method include: flexible load distribution, easy isolation of faults, high reliability, etc. The method cannot respond according to the real-time operation of the power grid, and it is difficult to ensure that comprehensive possible situations are considered. The action of the backup power self-injection device may cause the overload operation of the main transformer, which will bring serious consequences for the overcurrent protection action of the main transformer (Feng Ling. The practice of preventing the action overload scheme of the standby automatic switching device [J]. North China Electric Power Technology, 2006, (08))

Therefore, for this 10kV bus connection method, a three-bus four-segment backup self-switching adaptive switching method is proposed, which solves the difficulty of automatic real-time control of this multi-segment bus backup and self-switching, which is very important for improving power supply. Reliability plays an important role

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