Optimized input method and system for automatic input device of standby power supply

Abstract

The invention provides an optimized input method of an automatic input device of a standby power supply. The optimized input method comprises the following steps of acquiring bus voltage, incoming line current and on-off states of an incoming line switch and a bus coupler section switch; comparing the bus voltage with the bus incoming line current, traversing out a power-losing bus and a non-power-losing bus, and determining a spare power switching state of the non-power-losing bus and a corresponding load margin in combination with each switching state, each bus preset load and a preset powersupply capacity of each transformer substation; controlling an incoming switch of the power-losing bus to be tripped off in a delayed manner, and determining the number of standby power supplies of the power-losing bus and the standby power supplies; and detecting whether a power-losing bus bids the same standby power supply or not, and setting a standby power supply switching scheme to carry outoptimized switching on the corresponding bus coupler section switch by combining the number of the standby power supplies, the load margin of the standby power supplies and the preset load of the power-losing bus. The method is suitable for bus multi-segment complex wiring scene optimization and cooperation, and the potential risk that the power supply interruption range is enlarged due to the fact that multiple segments of buses are switched into the same standby power supply in a standby mode can be avoided.

Description

technical field [0001] The invention relates to the technical field of automatic switching of backup power sources in electric power systems, in particular to an optimized input method and system for automatic input devices of backup power sources. Background technique [0002] With the development of society and economy, the demand for electricity in cities continues to increase, and the requirements for the reliability of power supply are increasing. The standby self-switching device can automatically and quickly put the backup power into operation after the working power is disconnected due to failure or other reasons, so that users can restore power supply as soon as possible. It is an important means for the power department to ensure continuous and reliable power supply for users. It has been widely used in power systems application. [0003] like figure 1 As shown, in the power grid with multi-section and complex wiring of substation busbars, each section of busbar ...

AI Technical Summary

Problems solved by technology

In addition, since two adjacent sections of busbars are backup objects for each other, it may lead to bidding for the same backup power supply when two sections of busbars lose power at the same time. Reliability of power supply after backup

[0004] However, the existing standby automatic switching device cannot meet the optimization action and coordination of complex multi-section bus main and standby power switchover

In view of the above problems, the current research work mainly includes: For example, Mo Xiaofeng, Liu Xihai and other scholars have proposed a multi-section busbar automatic switching backup power selection idea (discussion on the multi-section 10kV busbar backup automatic switching scheme [J]. Jiangxi Electric Power Journal of Vocational and Technical College, 2005 (03): 34-35.), but only by judging whether the backup power supply meets the load demand, it does not further optimize the selection of the backup power supply, nor does it consider the problem of power-off bus bidding; and for example, Zhao Yuyang proposed an action logic for multi-section bus backup and automatic switching (the action logic for backup and automatic switching of the 10kV substation power system of Dagangshan Hydropower Station[J]. Hydroelectric Power Generation, 2015,41(07):81-84.), but It is only aimed at specific hydropower stations, not universal, and adopts the method of fixed standby and automatic commissioning, without realizing the optimization action of standby and automatic commissioning

[0005] To sum up, it can be seen that the current research on standby automatic switching adapting to the complex wiring of multi-section busbars is not perfect, and the method has many defects

Therefore, there is an urgent need for an optimized input method for the backup power automatic input device suitable for multi-section busbar complex wiring, which can not only meet the optimization action and coordination of complex multi-section bus master and backup power switchover, but also reduce the standby power In the event of post-connection load shedding, it avoids the potential risk of expanding the scope of power supply interruption caused by multiple busbars backing up to the same backup power supply, and improves the reliability and continuity of power supply

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