Control method for compensating electromagnetic torque to realize quick and smooth tracking of maximum wind energy

Abstract

The invention discloses a control method for compensating electromagnetic torque to realize quick and smooth tracking of the maximum wind energy of a wind turbine. By virtue of compensation of the electromagnetic torque, the rotor response speed is controlled, so that the quick and smooth tracking of the maximum wind energy of the wind turbine is realized. The design process of a torque compensating link comprises the following steps: firstly, as in a steady state, the electromagnetic torque needs to correspond to a value of a best torque curve under the current speed, initially determining the functional form Kc*(Tm-Te<*>) of the electromagnetic torque compensating link, then applying a small-signal analysis method and Laplace to transform and obtain the functional form, thereby determining the functional relationship of rotor response speed and wind speed; and then according to the relationship of the rotor response speed and the wind speed, designing the mathematical expression of a compensation factor Kc in the electromagnetic torque compensating link, so as to eliminate the influence of the wind speed Vm on the rotor response speed; and finally, on the basis of eliminating the influence of the wind speed on the rotor response speed, determining the value of a parameter in the compensation factor mathematical expression by virtue of emulation, so that the rotor response speed reaches an appropriate value.

Description

technical field [0001] The invention is a control technology for realizing fast and stable tracking of maximum wind energy by electromagnetic torque compensation, and belongs to the technical field of motor drive and control. Background technique [0002] The variable speed wind power system generally adopts the maximum wind energy tracking control, and the core of this control method is to capture the maximum power point of the wind power system. Due to the randomness of wind speed and the nonlinearity of wind power system, it is difficult to capture the maximum power point, which is also one of the hot issues of wind power generation. There are many traditional maximum power point capture methods, and the most practical applications are hill-climbing search method, power feedback method, optimal torque method and so on. The principle of the hill-climbing search method is to artificially apply the speed disturbance variation, determine the control increment of the fan spee...

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Problems solved by technology

Since the principle of this method is similar to the power feedback method, the defects of this method are basically the same as those of the power feedback method, that is, the influence of wind speed on the rapidity and stability of the system, which will not be described here; The commonly used maximum power point capture method generally has the problem of insufficient speed and stability, so it is necessary to propose a control method that improves the speed and stability of the maximum wind energy tracking system

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