Nonlinear fractional order auto disturbance rejection damping control method of doubly fed induction generators

Abstract

The invention provides a nonlinear fractional order auto disturbance rejection damping control method of doubly fed induction generators. The method is characterized by comprising the following steps: establishing a multi-unit system mathematical model comprising the doubly fed induction generators; constructing a mathematical model comprising a fractional order system through diffeomorphism mapping; compensating system parameters and state variables which are included in pre-control variables through design of an extended state observer in an auto disturbance rejection controller; and selecting a fractional order auto disturbance rejection control law and the like. The method provided by the invention effectively improves the damping level of a doubly fed induction generator power grid, effectively estimates model errors and external uncertain disturbance, eliminates errors by use of feedback linearization, effectively enhances the power oscillation inhibition capability of the doubly fed induction generators, reduces investment of additional equipment and improves operation benefits of the power grid, and also has the advantages of scientificalness, rationality, simplicity, effectiveness, quite high robustness, high engineering application value and the like.

Description

technical field [0001] The invention relates to the field of power system operation and control, and relates to a nonlinear fractional-order active disturbance rejection damping control method for a doubly-fed induction wind turbine, which is applied to the damping control of an interconnected power grid including a doubly-fed induction wind turbine. Background technique [0002] With the interconnection of the national power grid, it is very easy to cause power oscillations in the power system, seriously affecting power transmission and the safe and stable operation of the power system. Especially with the rapid development of wind power technology in recent years, Doubly Fed Induction Generators (DFIG) have been widely used, making the characteristics of the interconnected grid more complex. Therefore, the damping control of the interconnected grid with DFIG is a problem worthy of attention. When the power oscillation occurs in the power grid, if the oscillation cannot be...

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Problems solved by technology

However, the power grid containing DFIG is a typical uncertain parameter and strong nonlinear time-varying system, and the operating conditions of the system change all the time, so the traditional PI controller is difficult to meet the requirements

However, the above methods generally have disadvantages such as large investment, weak robustness of the control strategy to parameters, and difficulty in implementation.

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