Method for identifying parameters of doubly-fed wind generator converter control system based on superposed M sequence

Abstract

The invention discloses a method for identifying parameters of a doubly-fed wind generator converter control system based on a superposed M sequence. The identification method comprises the steps of building a rotor-side converter double-input single-output equivalent model, superposing a small-amplitude three-phase M sequence on a stator-rotor current measurement signal through the continuous excitation property of the M sequence, and optimizing and fitting the input and output data based on a sine and cosine optimization algorithm to obtain a PI parameter identification value of the controller. The parameter identification method based on the secondary measurement signal superposed M sequence can prevent the controller from falling into a nonlinear working interval, and meanwhile, only the excitation signal needs to be superposed on the stator and rotor measurement signal, so that the operation on the intermediate state variable in the control process is avoided, and the engineering practicability is improved. Meanwhile, benefited from continuous excitation of the M sequence, the control parameter identification error is less than 5%, the identification precision is high, and the method has great significance for establishing an accurate mathematical model of the doubly-fed fan.

Description

technical field [0001] The invention relates to a doubly-fed wind power generator, specifically a parameter identification method, which is applicable to the identification of PI parameters of a doubly-fed wind power generator converter control system, thereby obtaining accurate control parameters of the converter control system, which is a digital method for power systems. The simulation analysis provides a more accurate mathematical model, which is of great significance to improve the reliability of the digital simulation results of the double-fed fan system. Background technique [0002] In recent years, wind power generation has developed rapidly, and the installed capacity has increased rapidly. In the future, the penetration rate of wind power in the power grid will continue to rise. At the same time, the problem of safe and stable operation of the power grid under the background of a high proportion of wind power connected to the grid is becoming more and more serious...

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Problems solved by technology

For the three-phase short-circuit excitation method on the primary side, if the voltage drop is too large, the control system will easily fall into the nonlinear working area and cannot obtain effective input and output data; for the excitation method of the step disturbance of the control system reference value setting, there is The problem that the controllers of some manufacturers cannot manually set the step change of the reference value; for the excitation method of directly superimposing the pseudo-random sequence, since the input of the system is the intermediate variable of the actual fan controller, it cannot be realized without modifying the controller. Input quantity superposition pseudo-random sequence

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