An active power distribution method for improving fatigue uniformity of wind turbines

Abstract

The invention discloses a method for active power distribution for improving the fatigue evenness of wind generating sets. The method comprises the following steps that 1) according to forecasted wind speed of a wind power plant within 0 to 4 hours and the rated power of each set, the available power of each set in the next control period is calculated; 2) according to the rated power of each set, history active power data and maintenance history data, a fatigue coefficient of each set is calculated; 3) according to a dispatched and issued active power output task of the wind power plant and the rated power, the usable power and the fatigue coefficient of each set, the sets in grid-connected operation are determined; with the consideration of active power output capacity constraint of the sets and according to the fatigue coefficient of each set and the inversion proportion of the fatigue coefficients of the sets, the active power output task of the wind power plant is decomposed to the sets in grid-connected operation. According to the method, on the premise that a trace scheduling set value of the active power of the wind power plant is guaranteed, the fatigue evenness of each set of the wind power plant is improved, the synchronism of maintenance of each set is improved, and the maintenance frequency of the wind power plant is reduced.

Description

technical field [0001] The invention relates to an active power control and distribution mechanism of a wind farm, in particular to an active power distribution method for improving the fatigue uniformity of a wind power generating set. Background technique [0002] The installed capacity of wind turbines in my country continues to rise. The "Technical Regulations for Wind Farms Connected to Power Systems" issued by the State Grid Corporation of China clearly stipulates: "Wind farms must have power regulation capabilities and be able to control their active power output according to the instructions of the grid dispatching department. In order to achieve To control the active power of the wind farm, the wind farm needs to install an active power control system that can receive and automatically execute the active power control signal sent by the dispatching department remotely.” Wind farm active power control technology is an important basis for wind farm grid connection. [...

AI Technical Summary

Problems solved by technology

[0006] 1) The frequent startup and shutdown of the wind turbine affects the life of the turbine. At the same time, it takes a certain amount of time to start and stop the wind turbine, and the adjustment speed is slow;

[0007] 2) This method takes the active power of a single unit as the adjustment granularity. As the capacity of a single wind turbine unit reaches the multi-megawatt level, this method is difficult to accurately track the active power of the wind farm to the grid requirements;

[0008] 3) The synchronization of the life maintenance cycle of each unit in the whole wind farm is not considered

The disadvantage of this method is: the area of ​​the wind farm is large, and due to the influence of the terrain and the wake effect of the wind turbine, there is a large difference in the wind speed in the wind farm, and the unit with a higher average wind speed has a larger available power , more active power tasks are obtained through proportional distribution, and more active power is output, which eventually leads to uneven fatigue of each unit in the wind farm, asynchronous maintenance, and increased maintenance frequency

[0011] 1) It is more suitable for offshore wind farms with strong wake regularity. For land, especially mountainous wind farms, the turbulent flow is serious, and the influence of wake takes second place. This method is difficult to apply;

[0012] 2) This method artificially sacrifices the active power of the wind farm, resulting in less power generation, which not only damages the income of wind power owners, but also causes the active output of the wind farm to deviate from the requirements of the dispatching system, restricting its application range

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