Wind power plant yaw control method considering unit wake flow

Abstract

The invention discloses a wind power plant yaw control method considering unit wake flow. According to the set power PI real-time and wind energy capture coefficient (img file = 'DDA 0001660749860000011. TIF 'wi = '233 'he = '88 ') converting the electric power maximization problem of the wind farm into an optimal problem of solving the axial induction coefficient ai, the internal model of the wind power plant with the wind power plant wake flow effect can be predicted, the wind power plant yaw control method considering unit wake flow is guided by controlling the yaw wake flow deviation, thewake flow of the lower wind direction unit and the axial induction of the wind wheel, the yaw angle method of the wind turbine generator is adopted, and the generating capacity of the wind power plantis increased by reducing the interaction of the wake flow; only the lower wind direction adjacent unit is considered, the axial induction coefficient ai is subjected to iterative calculation, the mixing effect of the free air is achieved, the influence of wake flow attenuation is greatly reduced, and the calculation time of the induction coefficient ai is greatly shortened. According to the windpower plant yaw control method considering unit wake flow, the measurement result is accurate, the reliability is high, and the control effect is more ideal.

Description

Technical field [0001] The invention relates to the technical field of wind power generation, in particular to a wind farm yaw control method considering the wake of a unit. Background technique [0002] At present, with the increase of wind farm capacity, the effect of wind turbine wake interaction in the wind farm has become an important field in the study of wind turbine control algorithms. The topology and magnitude of wake interaction are based on time-varying atmospheric conditions (for example: wind direction, wind speed, wake, atmospheric stability), and also based on the adjustable operating point of each unit (by changing control settings, such as generators) Torque, pitch angle, yaw angle, etc.). [0003] Wake is a kind of air flow structure, which has the characteristics of reducing wind speed, because the wind turbine of the unit absorbs dynamic energy from the inflowing air flow, and the wake is increased because the unit blocks the air flow. Units in a wind farm ca...

AI Technical Summary

Problems solved by technology

If a unit is not completely covered by free airflow, but is located in the wake path, the reduction in wind speed will lead to a reduction in the power generation of the unit; on the other hand, the increased wake and shear in the wake will result in a lower Increased dynamic load on wind turbines

[0004] In the current industrial practice, the existing technology controls the wind farm by adjusting the pitch and torque. The units in the wind farm still use the control method of each unit to maximize the power generation performance, ignoring the impact of the wake on other units.

The response of the entire wind farm system to the change of the control reference is quite slow, and the yaw control of the wind farm becomes more difficult due to the long delay of the airflow passing from one unit to another

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