Distributed low-voltage load shedding acceleration action method and device considering load characteristics

Abstract

The invention discloses a distributed low-voltage load shedding acceleration action method and device considering load characteristics. The method comprises the steps that three-phase line voltage and line current data of a line where a protection device is located are acquired in real time; according to the obtained three-phase line voltage and line current data, it is judged that the voltage of the power system cannot be recovered quickly, and the voltage of the power system needs to be recovered in a low-voltage load shedding mode, wherein the judgment basis comprises a first judgment condition and a second judgment condition; according to the electrical quantity change characteristics, voltage sensitive loads are judged and identified, wherein the judgment and identification basis is a third judgment condition; and when the first judgment condition, the second judgment condition and the third judgment condition are all met, a low-voltage load shedding acceleration action is executed. When the power grid cannot be quickly recovered due to insufficient dynamic voltage support capability after a serious fault occurs in the power grid and the voltage of the power grid is quickly reduced, the voltage sensitive load is quickly and accurately cut off through low-voltage load shedding to guarantee safe and stable operation of the power grid, and the possibility of misoperation is reduced.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a distributed low-voltage load shedding acceleration action method and device considering load characteristics. Background technique [0002] There are few power sources in the load center area, and there is a problem of "hollowing" of power sources. After serious failures of nearby lines or main transformers, the dynamic voltage support capacity is limited, and the voltage recovery speed is slow or unable to return to normal levels, which brings major risks to the operation of the power grid. It is necessary to maintain the safe and stable operation of the power grid through low-voltage load shedding, which can guarantee the safety of the power grid after a serious failure, and avoid the collapse of the system voltage leading to blackouts. Low-voltage load shedding is a basic and effective control measure to solve the problem of voltage stability. At p...

AI Technical Summary

Problems solved by technology

Low-voltage load shedding is a basic and effective control measure to solve the problem of voltage stability. At present, the low-voltage load shedding strategy integrated in the distribution network line protection device (hereinafter referred to as "distributed low-voltage load shedding device") is only through the preset The voltage threshold value must meet the extended time to realize the load shedding function. Due to the large difference in the dynamic change process of the voltage excited by different loads, the current load shedding device does not consider the influence of the load characteristics, and cannot fully play the role of low-voltage load shedding. When the voltage support is insufficient, Unable to accurately remove voltage sensitive loads, resulting in expanded power outage range

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