Method for increasing residual voltage of bus short circuit based on reactive power regulation of synchronous motor

Abstract

The invention provides a method for increasing a residual voltage of a bus short circuit based on reactive power regulation of a synchronous motor, and belongs to the technical field of motor control.The method for increasing the residual voltage of the bus short circuit based on the reactive power regulation of the synchronous motor comprises the following steps of S1: performing excitation by the synchronous motor to increase a bus voltage when it is detected that a power system has a short circuit fault; and S2: when the bus voltage is increased to a preset voltage value, regulating a current of the synchronous motor to a rated current. When it is detected that the power system has the short circuit fault, the synchronous motor performs the excitation to increase the bus voltage; and when the bus voltage is increased to the preset voltage value, the current of the synchronous motor is adjusted to the rated current, so that the speed of increasing the bus voltage to the preset valueis high, and the accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of motor control, and relates to a method for improving short-circuit residual voltage of a busbar based on reactive power adjustment of a synchronous motor. Background technique [0002] During the operation of the power system, short-circuit faults often occur. When a short-circuit fault occurs in the power system, the short-circuit current value in the short-circuit circuit will increase greatly, and at the same time, it will cause the voltage in the power grid to drop, even to 60%-70% of the original voltage, which may damage the power supply of some users. In order to make the system work normally, it is necessary to focus on analyzing the cause of the bus voltage drop. [0003] The substation is divided into three sections, and due to technical reasons, it cannot be bus-connected, so each line works independently. However, when the system is running, short-circuit faults will inevitably occur. Durin...

AI Technical Summary

Problems solved by technology

When a short-circuit fault occurs in a substation, the rapid increase of the short-circuit current will reduce the bus voltage to 75% or even 70% of the original value, which will cause many equipment in the substation to trip and the system to fail to work normally.

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