Off-grid wind generator system maximum power tracking method and controlling device thereof

Abstract

The invention discloses an off-grid wind generator system maximum power tracking method and a controlling device thereof. The method comprises the following steps: measuring a rotating speed and an output power of a generator; calculating duty ratios through a Hill climbing method and a proportion control method respectively, and superposing the two duty ratios as a boost circuit duty ratio; multiplying the boost circuit duty ratio by a switching period, and calculating conduction time of a boost circuit power switch device to realize off-grid wind generator system maximum power tracking. The control device comprises a generator rotating speed measuring circuit module, an input voltage sampling circuit module, an input current sampling circuit module, a DSP control circuit module, a driving circuit module, an uncontrollable rectification circuit module and a boost circuit module. The DSP control circuit module calculates and generates a PWM control signal, and make-and-break of a power switch device of the boost circuit module is controlled through the driving circuit module. The maximum power tracking method has the advantages of short tracking time and high tracking precision, and generating efficiency of an off-grid wind generator system is effectively raised.

Description

technical field [0001] The invention belongs to the control technology of an off-grid wind power generation system, and in particular relates to an improved maximum power tracking method and a device thereof for an off-grid wind power generation system. Background technique [0002] The off-grid wind power generation system is a wind power generation system that can be operated independently. Compared with the grid-connected wind power generation system, it has the characteristics of flexible configuration and simple control. In remote areas where the power grid cannot reach, off-grid wind power generation systems are widely used, which can effectively solve the problem of power consumption in remote areas, island outposts, and communication base stations. [0003] The off-grid wind power generation system consists of wind turbines, generators, controllers and loads. The main function of the wind turbine is to capture wind energy. The wind turbine rotates driven by the win...

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Problems solved by technology

[0021] The purpose of the present invention is to provide a maximum power tracking method and device for an off-grid wind power generation system, which solves the shortcomings of the general mountain climbing method, such as long tracking time and poor dynamic response in the face of rapid changes in external wind speed, thereby Speeds up time to MPPT and improves dynamic response for general hill climbing

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