Wind turbine generator set performance-guaranteeing maximum wind energy capturing method based on BLS and double-layer SMC

Abstract

The invention discloses a wind turbine generator set performance-guaranteeing maximum wind energy capturing method based on BLS and a double-layer SMC. The method includes solving a control target forrealizing maximum power tracking of the wind turbine generator; calculating a maximum power tracking error according to an effective wind speed estimation value given by a wind speed estimation modelbased on the BLS; designing the upper and lower bounds of the maximum power tracking error, converting the constrained maximum power tracking error into an unconstrained variable, solving the dynamiccharacteristics of the unconstrained variable, and designing a control signal expression and a control gain updating rate according to the double-layer SMC principle. The method is low in implementation cost, system overshoot and tracking errors can be reduced; meanwhile, the transient and steady-state performance of the system is guaranteed, the mechanical load of a unit transmission chain system can be reduced, the failure rate is reduced, the service life of the unit is prolonged, the implementation process is simple, the practicability is good, and compared with a traditional optimal torque control algorithm, the unit productivity can be improved, and the economic benefits of a wind power plant are increased.

Description

technical field [0001] The invention relates to the technical field of control of wind power generators, in particular to a wind power capture method based on BLS and double-layer SMC to ensure maximum wind energy. Background technique [0002] Control technology is the core technology of wind power generation system and the basis for ensuring the safe and stable operation of wind turbines. Maximum wind energy capture is one of the main control objectives of wind turbines and an important guarantee for the maximum economic benefits of wind farms. In order to achieve this goal, the optimal torque control algorithm is generally used in the industry at present. The principle of this algorithm is very simple, that is, Assuming that the wind speed is a constant value, only the steady state of the system is considered, and the control gain is multiplied by the square of the generator speed as the set value of the electromagnetic torque. However, since the optimal torque control a...

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Problems solved by technology

[0006] In order to improve the wind energy capture efficiency of wind turbines and the practicability of MPPT control, solve the problems that the existing maximum wind energy capture method has low wind capture efficiency, cannot guarantee the transient and steady-state performance of the system at the same time, and has poor practicability due to the need to measure the effective wind speed. The present invention provides a method for capturing maximum wind energy with guaranteed performance of wind turbines based on BLS and double-layer SMC, which does not need to add additional sensors, has low implementation cost, and can ensure the transient and steady-state performance of the system at the same time, thereby increasing the generating capacity of the unit

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