Dual-mode self-adaptive coordinated control method of voltage source and current source for wind turbines
A wind turbine, coordinated control technology, applied in the direction of wind power generation, single grid parallel feeding arrangement, etc., can solve the problems of inapplicability, poor self-adaptability, high construction cost, etc., to reduce construction cost, improve stability, enhance resistance Effects of interference and robustness
Active Publication Date: 2021-11-09
ZHEJIANG WINDEY
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However, the installation of auxiliary devices will lead to relatively high construction costs; and for the implementation of adjusting the parameters of the phase-locked loop and the inner and outer loops on the machine side and the grid side, since the equivalent short-circuit ratio of the grid-connected point of the wind farm will change with the start-up of the grid Therefore, the adaptive ability of this implementation method is relatively poor, and it cannot be applied in extremely weak network conditions
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0051] see figure 1 , which shows a flowchart of a dual-mode self-adaptive coordinated control method for a voltage source and a current source of a wind turbine provided in an embodiment of the present application. Adaptive coordinated control methods may include:
[0052] S11: collect the operating parameters of the wind turbine at every preset time interval, and use the operating parameters to obtain the equivalent short-circuit ratio of the power grid;
[0053] Wherein, the op...
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This application discloses a dual-mode self-adaptive coordinated control method for a voltage source and a current source of a wind turbine, including: judging whether the equivalent short-circuit ratio is greater than or equal to the first threshold; The fluctuation causes the speed of the wind turbine to be unstable. If so, run in current source mode; if not, run in voltage source mode; if it is greater than or equal to, judge whether the current control mode is current source mode; Subsynchronous oscillation or high-frequency oscillation occurs, if so, switch to the voltage source mode, if not, maintain the current source mode; if not in the current source mode, determine whether the equivalent short circuit ratio is greater than or equal to the second threshold, if so, switch to the current source mode Source mode, if not, maintain voltage source mode. The above-mentioned technical solution disclosed in the present application improves the stability of wind turbine grid-connected and reduces the construction cost by selecting between the current source mode and the voltage source mode.
Description
technical field [0001] The present application relates to the technical field of wind power generation, and more specifically, relates to a dual-mode self-adaptive coordinated control method for a voltage source and a current source of a wind turbine. Background technique [0002] With the development of wind power technology, the penetration rate of wind power in the entire power grid is getting higher and higher. However, with the increase of wind power penetration rate, the strength of the power grid is getting weaker and weaker. Correspondingly, the problems of frequency stability and voltage stability of the power grid have gradually become prominent. [0003] At present, two aspects of power grid and wind turbines are often used to strengthen the frequency and voltage stability of wind turbines connected to weak power grids. Among them, from the perspective of the power grid, the strength of the power grid can be enhanced by adding auxiliary devices, such as: installi...
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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 洪敏应有赖全怡法拉蒂尔杨靖
Owner ZHEJIANG WINDEY