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Backstepping sliding mode maximum wave energy capture method

A backstepping sliding mode and backstepping technology, which is applied in the control of generators, electronic commutation motor control, control systems, etc., can solve the problem of inability to track linear generators in real time with wave vertical speed, unsatisfactory development, and wave frequency amplitude. instability, etc.

Active Publication Date: 2019-10-08
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the unstable frequency and amplitude of ocean waves and the insufficiency of existing technologies, the development of wave energy maximum wave energy capture technology is not ideal, and the maximum wave energy capture cannot be achieved for a long time
It is impossible to track the vertical wave velocity in real time and feed it back to the linear generator online, and change the operating status of the linear generator in real time

Method used

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  • Backstepping sliding mode maximum wave energy capture method
  • Backstepping sliding mode maximum wave energy capture method
  • Backstepping sliding mode maximum wave energy capture method

Examples

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Embodiment 1

[0290] The structure diagram of the direct drive wave energy conversion device provided by this embodiment is as follows Figure 11 shown. A key feature of direct drive wave energy conversion systems is the use of permanent magnet linear motors as generators compared to wave energy conversion using hydraulic or pneumatic systems. During the working process, the mover of the PMLG is directly connected to the buoy or buoy through the direct contact of the buoy or buoy with the wave. As the waves rise and fall, the waves convert mechanical energy into mechanical energy for the buoy.

Embodiment 2

[0292] This embodiment provides the working flow diagram of the direct-drive wave energy generation system, such as Figure 12 As shown, under the action of waves, the mover of the generator drives the generator to generate electricity through the reciprocating linear motion of the float. The required AC output of the generator is controlled by a rectifier and a controller to obtain the best output effect, and then the output electric energy is stored to an energy storage device or a power supply device for power supply. The controller generates control signals according to real-time wave height and wave frequency and generator output. The SVPWM generator controls the switch to start and stop the rectifier in real time, and adjust the load of the waveform energy power generation system in real time. Electromagnetic force and reference current. The frequency of ocean waves The frequency of the incident waves of the wave energy generation system is consistent, and the entire s...

Embodiment 3

[0294] This embodiment provides a backstepping sliding mode maximum power tracking system control framework, such as Figure 13 As shown, a control strategy for PMLG speed control is proposed. By tracking the dq axis current components, the BSMC controller is designed to stabilize the current error to obtain the input v. The pulse generator voltage pulse width modulation (SVPWM) voltage signal is then sent out through it. The pulse adjusts the working state of the converter on the machine side. It can be seen that as long as the dq-axis current generator can track the input reference current in real time, the anti-electromagnetic force of the generator can be adjusted online in real time to approach the reference value. It can ensure that the energy conversion system (PMLG) and the wave reach resonance and obtain the maximum wave energy.

[0295] The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantage...

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Abstract

The invention provides a backstepping sliding mode maximum wave energy capture method. The method comprises the following steps: establishing a dynamic model of a direct-drive wave energy power generation device; establishing the mathematical model of a permanent magnet linear generator; designing a maximum wave energy tracking controller based on a backstepping method; and designing a backstepping sliding mode controller through combination of the backstepping method and a sliding mode control method. The structure and the mathematical model of the wave energy capture device and the permanentmagnet linear generator are mainly studied, the optimal power output condition of the system is constructed according to the incident frequency and the amplitude of the wave, the decoupling method ofid=0 is used and the optimal reference current of the d-q axis is obtained. The optimal reference current is controlled and tracked by the sliding mode variable structure. The simulation results showthat the backstepping sliding mode control strategy improves the robustness of the system in comparison with the traditional PID control strategy and is obviously superior to the traditional controlin output current, voltage and power and has obvious advantages in maximum wave energy capture.

Description

technical field [0001] The invention relates to the technical field of new energy applications, in particular to a method for capturing maximum wave energy in a backstepping sliding mode. Background technique [0002] As an algorithm, the maximum wave energy capture of wave energy based on the backstepping sliding mode method has not been widely used in the field of new energy. The key technology of wave energy generation is to improve the power capture and energy conversion efficiency of the wave power generation system. In order to achieve the maximum wave energy capture of wave energy, it is necessary to make the motion frequency of the wave energy conversion system equal to the motion frequency of the ocean waves, that is, to achieve resonance. Achieve maximum wave energy capture of wave energy. Considering the characteristics of the linear generator and the dynamic model of the wave energy conversion system, by controlling the anti-electromagnetic force of the permanen...

Claims

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Application Information

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IPC IPC(8): H02P21/00
CPCH02P21/0007
Inventor 王宁付水贾玉森王泊桦杨毅
Owner DALIAN MARITIME UNIVERSITY
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