Wide area self-adaptation spare power automatic switching method based on synchronous phasor measurement

Abstract

The invention discloses a wide area self-adaptation spare power automatic switching method based on synchronous phasor measurement. By means of topology analysis, an association relationship between buses and lines is determined, a mode of operation of the lines and the buses is recognized, an initial operation state is recorded, faulty area, normal power supply area and area to be restored are determined, whether small power sources in a regional power grid are required to be immediately removed or not is determined, if the small power sources in the regional power grid are not required to be immediately removed, a spare power automatic switching power source is subjected to a quasi-synchronization grid connection, otherwise, all small power circuit switches in the area to be restored are tripped off, all non-fault working power source switches in a power-loss area are tripped off, and power restoration process is completed through circularly searching for power supply buses to be restored and closed corresponding line switches. According to the wide area self-adaptation spare power automatic switching method based on the synchronous phasor measurement, a centralized decision-making coordination mode which is specific to the integrated power grid is utilized so that a novel spare power automatic switching method has the advantages that the wide area is achieved, the method is capable of being self-adaptive to operation mode and the small power sources access to the power grid.

Description

technical field [0001] The invention belongs to the field of electric power system automation, and more specifically relates to a wide-area self-adaptive backup and automatic switch-on method based on synchronized phasor measurement. Background technique [0002] With the development of social economy, the scale of power grid is expanding day by day, the structure of power grid is becoming more and more complex, and the quality and reliability of power supply are getting higher and higher for users. In the modern power grid, in order to meet the economic and reliable operation of the power grid, the power grid wiring generally adopts closed-loop design and open-loop operation, especially for 110kV power grid. Therefore, it is widely used as an effective means to improve the reliability of power supply to configure the backup power automatic input device (abbreviated as standby automatic input device). For example, a 110kV substation is equipped with at least two power incom...

AI Technical Summary

Problems solved by technology

[0004] In addition, conventional standby automatic switching usually only judges whether to switch the power supply line based on the voltage of the main line, but in the actual operation of the power grid, many 110kV substations are connected to small power sources with different capacities

When the incoming line is disconnected, the 110kV and below power grid will run in isolation, resulting in weak support of voltage and frequency

In this way, for a system with a small power supply connected, the no-voltage criterion of the bus will be invalidated, resulting in the refusal of the standby automatic switching device

In addition, due to the existence of small power sources, the input of backup power sources may cause the impact of "non-synchronous closing of small power sources and large power grids"

Therefore, the current common practice is to immediately cut off the small power supply, as long as there is a small power supply, it will be cut off, which will inevitably cause at least a short-term bus voltage loss

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