A control system and method suitable for starting and stopping a wind turbine in a low wind speed section
A wind turbine and control system technology, which is applied in the control of wind turbines, wind energy power generation, wind turbines, etc., can solve the problems of decreased utilization rate of wind energy and poor adaptability, and achieves the effect of improving utilization rate of wind energy and improving adaptability
Active Publication Date: 2020-11-20
ZHEJIANG WINDEY
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Problems solved by technology
[0004] The present invention mainly solves the problem that the existing wind turbine control method is not adaptable to wind speed fluctuations in short-term small wind sections, which leads to a decrease in wind energy utilization, and provides a method of off-grid control according to the rotation speed and can shorten the wind turbine cycle time. The time required to enter the power generation state, the control system and method for improving the utilization rate of wind energy and adapting to the start and stop of wind turbines in low wind speed sections
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Embodiment
[0026] This embodiment is a control system suitable for starting and stopping wind turbines in the low wind speed section, such as figure 1 As shown, it includes a wind speed and rotational speed calculation module 1, a pitch control module 2, an off-grid and grid-connected control module 3, and a dynamic control module 4 of the pitch angle limit value, and the wind speed and rotational speed calculation module, the pitch control module and the propeller The dynamic control modules of the pitch angle limit value are all connected to the off-grid and grid-connected control modules, and the pitch control module is also connected to the dynamic control module of the pitch angle limit value and the wind speed and rotational speed calculation module. The above modules are all set in the PLC of the wind turbine control system.
[0027] The pitch control module 2 is a nonlinear PI controller, and the expression of the nonlinear PI controller is (a 0 +a 1 Z -1 )*1 / rGS(β), a 0 =Ki(...
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The invention relates to a control system suitable for start and shutdown of a wind turbine generator in a low wind speed section. The control system comprises a wind speed and rotation speed calculation module, a pitch control module, a grid-disconnected and grid-connected control module and a pitch angle limiting value dynamic control module; the wind speed and rotation speed calculation module,the pitch control module and the pitch angle limiting value dynamic control module are connected with the grid-disconnected and grid-connected control module; and the pitch control module is also connected with the pitch angle limiting value dynamic control module and the wind speed and rotation speed calculation module correspondingly. The control system controls the wind turbine generator to bedisconnected from or connected with a grid by comparing magnitude relationships between a generator speed and a grid-disconnected rotation speed, idle running time and maximum idle running time for waiting for wind, a mean wind speed and a cut-in wind speed, and a duration when the speed is stabilized near a grid-connected speed and time required for grid connection, and comparing a relationshipbetween a wind acceleration and zero, so that the adaptability of the wind turbine generator to wind speed fluctuation in the small wind section is improved, the time for the wind turbine generator toenter the power generation state again is capable of being shortened and the utilization rate of wind energy is increased.
Description
technical field [0001] The invention relates to the technical field of control of wind turbines, in particular to a control system and method suitable for starting and stopping wind turbines at low wind speeds. Background technique [0002] In most wind farms in my country, especially low wind speed wind farms, due to reasons such as terrain, wake and turbulence, the wind turbines running on the grid often encounter short-term or ultra-short-time working conditions where the wind speed of the unit is lower than the cut-in wind speed. The wind turbine of the control strategy will trigger the underspeed protection and stop. After shutting down, even if the wind speed meets the restart requirements, the unit needs to complete the status self-check of the subsystem and the automatic test of the safety items before it can be started and connected to the grid, resulting in a decrease in the utilization rate of wind energy in low-wind-speed wind farms. [0003] Chinese Patent Publi...
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IPC IPC(8): F03D7/04
CPCF03D7/0224F03D7/0264F03D7/042Y02E10/72
Inventor 史晓鸣朱长江
Owner ZHEJIANG WINDEY