Method of testing frequency static characteristic coefficient of grid under condition of large non-grid disturbance

Abstract

The invention discloses a method of testing the frequency static characteristic coefficient of a grid under the condition of large non-grid disturbance, comprising the following steps: (1) exiting from the AGC of a grid-connected unit in a grid and other secondary frequency modulation control operations; (2) selecting a test unit serving as grid power disturbance in the grid: gradually increasing / decreasing the output of the test unit, and after each increase or decrease in output, stabilizing the output for a period of time to form a new steady-state frequency of the grid through adjustment; and (3) after the test, analyzing the total output and steady-state frequency of steady operation condition points of the grid in the test process, drawing a relational graph of the total output of the grid and the steady-state frequency of the grid, and getting a frequency static characteristic relation curve of the grid in different frequency bands through data fitting, wherein the slope of the curve is the measured frequency static characteristic coefficient of the grid. The problem that the existing grid frequency static characteristic coefficient test method is easily affected by secondary frequency modulation due to high restriction and uncertainness or is of high test difficulty and high security risk is solved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a test method for the static characteristic coefficient of the grid frequency. Background technique [0002] Primary frequency regulation is one of the indispensable ways to maintain the frequency stability of the power system. The larger the scale and the higher the complexity of the power system, the higher the requirement for primary frequency regulation capability. Moreover, in recent years, wind power, solar power and other new energy power generation have been continuously integrated into the grid, which requires a frequency modulation to play a huge role. The measured value of the frequency static characteristic coefficient β (unit: MW / 0.1HZ) is an important basis for reflecting the primary frequency modulation characteristics. The value of the frequency deviation coefficient B should be as close as possible to the frequency static characteristic coefficient β. The ...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for testing the grid frequency static characteristic coefficient under the condition of non-grid large disturbance, so as to solve the current grid frequency static characteristic coefficient test method or limitations, strong uncertainty, and easy to be affected by secondary frequency modulation. Or problems with difficulty in testing and high safety risks

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