Method for optimally designing parameters of double-fed wind-driven power generation control system

Abstract

The embodiment of the invention provides a method for optimally designing the parameters of a double-fed wind-driven power generation control system, which comprises: firstly, building a mathematical model of a double-fed wind-driven power generator; secondly, performing Z conversion of a component of the mathematical model by using a converter in a discrete domain according to the built mathematical model so as to obtain a characteristic equation of a transfer function of a current inner loop under the discrete domain; thirdly, obtaining a proportional integral PI parameter of the current inner loop according to the characteristic equation of the transfer function of the current inner loop under the discrete domain; and fourthly, introducing the obtained PI parameter into a PI regulator in the control system to optimize the regulation capacity of the PI regulator. Therefore, the control effect on the current of a double PWM converter is improved and the operation performance of a double-fed wind-driven power generation system is optimized and improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a parameter optimization design method for a doubly-fed wind power generation control system. Background technique [0002] At present, in the doubly-fed wind power generation system, it is necessary to control the dual PWM converter well to ensure the stability of the DC bus voltage, and to control the current of the rotor so that it changes with the reference current. The proportional-integral PI control link in the power generation system is an important part to realize these control functions. [0003] In the current control scheme of the pulse width modulation converter (PWM, Pulse Width Modulation) on the grid side, the main function is realized by the control system. In addition to the decoupling control of the active component and the reactive component, the proportional integral is mainly used PI control is used to obtain the stable DC voltage requ...

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Problems solved by technology

[0004] The design of appropriate PI parameters needs to establish a reasonable transfer function. In the prior art, the design methods of PI parameters are all based on the transfer function of the current inner loop. In the prior art, the design of the current inner loop The transfer function is established based on a continuous system. In actual engineering, some quantities are generally sampled, which makes the PI parameter design of the current inner loop inaccurate, thus affecting the current control of the dual PWM converter. Reduced performance of doubly-fed wind power generation systems

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