Difference optimization control method of directly-driven permanent magnet synchronous wind power generation system

Abstract

The invention discloses a difference optimization control method of a directly-driven permanent magnet synchronous wind power generation system. The difference optimization control method of the directly-driven permanent magnet synchronous wind power generation system is characterized by utilizing an electric energy structure of a back-to-back full power variable flow, respectively establishing astate space model for a machine-side converter control system and a network-side converter control system, stacking the product of the absolute values of the tracking errors of the machine-side converter control system and the network-side converter control system in the directly-driven permanent magnet synchronous wind power generation system and the time and the weight of the total harmonic wavedistortion rate of the output voltage waveform of the system, and taking the stacking result as the fitness function of evaluating the control performance, designing a difference optimization controlmethod based on real number encoding, and realizing optimization of PI controller parameters in the directly-driven permanent magnet synchronous wind power generation system. The difference optimization control method of the directly-driven permanent magnet synchronous wind power generation system can effectively improve the working efficiency and the power generation quality of the directly-driven permanent magnet synchronous wind power generation system, and the energy conversion efficiency and operation reliability of the wind power generation set, and can guarantee that the directly-driven permanent magnet synchronous wind power generation system is shorter in the stable time, is smaller in the steady state error and is higher in the robustness when the power grid is disturbed.

Description

technical field [0001] The invention relates to intelligent control technology in the field of new energy power generation systems, in particular to a differential optimization control method for a direct-drive permanent magnet synchronous wind power generation system. Background technique [0002] Directly-driven Permanent Magnet Synchronous Generator (hereinafter referred to as D-PMSG) eliminates the need for complex mechanical transmission mechanisms, and reduces the loss of wind turbines and improves wind power by adopting full-power variable current power control. The energy conversion efficiency and operational reliability of the unit. The power control strategy of the full power converter has a very critical impact on the operating characteristics and power output quality of the D-PMSG. In the context of the rapid increase in the capacity of wind power connected to the grid, grid-connected direct-drive wind turbines must have strong fault resistance capabilities, and...

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Problems solved by technology

Back-to-back full power conversion control strategy Since both ends are PWM conversion systems, the cont

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