Power oscillation power risk detecting method and system of fan flexible direct-current grid delivery system

Abstract

The invention relates to a power oscillation power risk detecting method and system of a fan flexible direct-current grid delivery system. The method comprises the steps that a set-up fan flexible direct-current grid delivery system simulation model is utilized, and disturbance voltage sources of different frequencies are added to a fan access point to acquire the voltage sequence and current sequence of a fan access point wind field side and a flexible direct-current grid side; then an impedance amplitude and an impedance phase angle are determined according to the voltage sequence and the current sequence; then whether the fan flexible direct-current grid delivery system has oscillation risks or not is detected through an impedance analysis method according to the impedance amplitude andthe impedance phase angle. According to the technical scheme, the disturbance frequencies are added to the fan access point of a simulation model to acquire the voltage sequence and the current sequence, the impedance amplitude and the impedance phase angle are determined, a bode diagram is drawn through the disturbance frequencies, the impedance amplitude and the impedance phase angle, the phaseangle margin of the system is determined according to the bode diagram, and whether the fan flexible direct-current grid delivery system has power oscillation risks or not is judged effectively.

Description

technical field [0001] The invention relates to the technical field of electric power detection, in particular to a power oscillation risk detection method and system for a wind turbine sending system through a flexible direct grid. Background technique [0002] At present, wind power technology is developing rapidly, but because wind power generation is mostly developed in a centralized manner, the load in the area is small, and the power grid is weak, it is facing the challenge of how to send wind power with large capacity and long distance; The unique advantages in this aspect provide a feasible method for reliable grid connection and transmission of wind power. However, there are influencing factors such as complex control in the flexible direct grid, and there is a risk of power oscillation in the wind power transmission system through the flexible direct grid. Existing research in the field of wind power detection technology mostly focuses on the power oscillation of t...

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Problems solved by technology

[0002] At present, wind power technology is developing rapidly, but because wind power generation is mostly developed in a centralized manner, the load in the area is small, and the power grid is weak, it is facing the challenge of how to send wind power with large capacity and long distance; The unique advantages in this aspect provide a feasible method for reliable grid connection and transmission of wind power. However, there are influencing factors such as complex control in the flexible direct grid, and there is a risk of power shock in the wind power transmission system through the flexible direct grid.

Existing research in the field of wind power detection technology mostly focuses on the power oscillation of the wind turbine through the series compensation system. At present, this field lacks an effective analysis method for detecting the oscillation risk of the wind turbine through the flexible direct grid transmission system.

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