Ocean current generator active disturbance rejection speed sensorless control system and control method thereof

Abstract

The invention provides an ocean current generator active disturbance rejection speed sensorless control system. The system comprises the ocean current generator, a sliding-mode observer which is connected with voltage and current signals of the ocean current generator and observes a rotor position and rotating speed information of the ocean current generator, an active-disturbance-rejection controller which is in signal connection with the sliding-mode observer, receives the rotating speed information observed by the sliding-mode observer, and estimates and compensates disturbance information, and a current converter which is connected with the ocean current generator, wherein the control quantity output by the active-disturbance-rejection controller is controlled by a current loop to generate an SVPWM signal to control the on-off of a current converter switch. The invention further provides an ocean current generator active disturbance rejection speed sensorless control system method. According to the ocean current generator active disturbance rejection speed sensorless control method provided by the invention, a switching function in the sliding-mode observer is improved, and a sign function is replaced by a saturation function to reduce high-frequency buffeting generated by high-frequency switching of the sign function at a critical point; and the observed rotor position is subjected to delay compensation through a Smith predictor.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to an automatic disturbance rejection speed sensorless control system and a control method for a marine current generator. Background technique [0002] In the past two decades, with the rapid growth of human demand for energy and the massive use of traditional energy such as oil, coal, and natural gas, the world has fallen into an energy crisis and an environmental crisis. Therefore, renewable energy and clean energy have attracted extensive attention from various countries. Among them, ocean current energy has attracted global attention because of its advantages such as high energy density, strong predictability, and easy access. For ocean current energy, the global annual potential is 800TWh, which is equivalent to about 5% of the entire electricity consumption. However, my country has a coastline of 18,000km and a vast sea area of ​​more than 3.6 million square kilometers,...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a sea current generator self-disturbance rejection speed sensorless control system and its control method to solve the problems of how to reduce chattering, eliminate time delay and improve the anti-interference ability of the system

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