A method and device for injecting disturbance into a power grid adaptability detection device

Abstract

The embodiment of the present application shows a method and device for injecting a disturbance into a power grid adaptability detection device. The technical solution shown in the embodiment of this application decomposes the target disturbance into three-phase symmetrical sinusoidal AC signals, calculates the voltage amplitude and given frequency, decomposes the measured three-phase voltage information into three-phase symmetrical sinusoidal AC signals, and calculates the voltage amplitude and frequency feedback signals are respectively used as the input of the disturbance quantity controller to realize independent closed-loop control of each disturbance quantity, improve the output accuracy of the detection platform, and thus improve the accuracy of the adaptability test of the tested device.

Description

technical field [0001] The invention relates to the field of electrical equipment, in particular to a method and a device for injecting a disturbance amount into a power grid adaptability detection device. Background technique [0002] In the face of the depletion of natural resources and the increasing power load, vigorously developing clean energy is an important development direction for the international community to deal with energy shortages and ensure energy supply. [0003] According to statistics, by the end of 2017, my country's photovoltaic and wind power installed capacity had reached 164 million kilowatts and 130 million kilowatts respectively. New energy has become the second largest power source for many provincial power grids, and even in some provincial power grids, the proportion of new energy installed capacity has exceeded 40%. It can be said that large-scale and high proportion of new energy will become an important feature of my country's new generation...

AI Technical Summary

Problems solved by technology

[0006] The protection thresholds set by the power electronic equipment of photovoltaic and wind turbines are relatively sensitive. In some cases, in the face of grid disturbances, if large-capacity photovoltaics and wind turbines are disconnected from the grid, it may cause system oscillation accidents, which will affect the power grid. Safe and reliable operation can be detrimental

[0007] Therefore, the grid adaptability of photovoltaic and wind turbines is detected through the adaptability detection device; the detection device shown in the prior art cannot truly reflect the grid adaptability of photovoltaic and wind turbines

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