Method and device for injecting disturbance for power grid adaptability detection device

Abstract

The embodiment of the invention proposes a method and device for injecting disturbance for a power grid adaptability detection device. According to the technical scheme of the invention, the method comprises the steps: decomposing a target disturbance quantity into a three-phase symmetric sine AC signal, calculating the voltage amplitude and given frequency, performing the actual measurement of the three-phase voltage information to decompose the information into the three-phase symmetric sine AC signals, calculating the voltage amplitude and a frequency feedback signal, taking the voltage amplitude and the frequency feedback signal as the input of a disturbance controller, and achieving the independent closed-loop control of each disturbance quantity, thereby improving the output precision of the detection platform, and improving the accuracy of the adaptability testing of a 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 disturbance into a grid adaptability detection device. Background technique [0002] In the face of the depletion of natural resources and the continuous increase of electricity load, vigorously developing clean energy is an important development direction for the international community to cope with energy shortages and ensure energy supply. [0003] According to statistics, by the end of 2017, the installed capacity of photovoltaic and wind power in my country had reached 164 million kilowatts and 130 million kilowatts respectively. New energy has become the second largest power source in 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 ...

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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