Direct-driven permanent magnetic synchronous wind power generation system and full auto disturbance rejection control method thereof

Abstract

The invention relates to a direct-driven permanent magnetic synchronous wind power generation system. The system includes a fan blade, a PMSG, a machine side converter, a capacitor, a grid side converter and a power grid and is used for absorbing electrical energy emitted from the permanent magnetic synchronous wind power generation system. The invention further relates to a full auto disturbancerejection control method for the direct-driven permanent magnetic synchronous wind power generation system. The double-closed loop vector control strategy of rotor field orientation is utilized by a permanent magnetic synchronous motor, an outer loop is a speed loop, an inner loop is a current loop, and auto disturbance rejection controllers are utilized by both loops to control operation of a machine side converter. Dynamic property of speed control is improved through an auto disturbance rejection speed controller, random disturbance caused by factors such as wind speed are reduced, and influence of nonlinear dynamic change within the system as well as external disturbance is reduced by an auto disturbance rejection current controller. The system is advantaged in that the system can overcome characteristics of uncertainty and multi-interference of a large permanent magnetic synchronous wind power generation system, performs real-time estimation and compensation for internal and external disturbances of a wind fan and improves reliability and anti-interference ability of the overall system.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a fully automatic disturbance rejection control method for a direct-drive permanent magnet synchronous wind power generation system. Background technique [0002] The direct-drive permanent magnet synchronous wind power generation system has attracted extensive attention from the industry due to its high efficiency, high power density, low maintenance cost, and better fault ride-through and grid support capabilities. Due to the randomness, low energy density and instability of wind energy, the wind power generation system is a nonlinear multivariable complex system, and the control technology is the key to the efficient, safe and reliable operation of the wind power generation system. However, due to the instability and variability of the wind, the wind power generation system will be subject to inevitable internal and external disturbances such as random wind, whic...

AI Technical Summary

Problems solved by technology

However, existing work mainly revolves around replacing the PI controller of the speed outer loop with an active disturbance rejection controller, while retaining the PI control of the current inner loop

However, permanent magnet synchronous motors have various uncertainties, such as sudden changes in speed / torque, dynamic changes in motor parameters, and current / voltage sensor noise. The control effect of the current inner loop will directly affect the performance of the overall fan. Therefore, high-performance current The design of the inner loop controller is equally important

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