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A grid-connected inverter control method for wave power generation system

A technology of wave power generation and control method, which is applied in the direction of converting irreversible DC power input into AC power output, electrical components, output power conversion devices, etc., can solve problems such as unavoidable chattering, and achieve enhanced robustness and Stability, reducing the effect of chattering

Active Publication Date: 2020-02-18
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

However, after reaching the sliding mode surface, the switching gain ε is fixed, and the "chattering" phenomenon cannot be avoided

Method used

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  • A grid-connected inverter control method for wave power generation system
  • A grid-connected inverter control method for wave power generation system
  • A grid-connected inverter control method for wave power generation system

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Embodiment Construction

[0031] In order to understand the present invention in more detail, the specific implementation steps of the present invention will be described in detail in conjunction with the accompanying drawings.

[0032] A grid-connected inverter control method for wave power generation systems, the entire algorithm structure is as follows figure 1 As shown, the specific implementation includes the following steps:

[0033] Step 1: Initialize the evaluation network learning rate and discount factor of the reinforcement learning algorithm, and design the reinforcement learning signal according to the system error;

[0034] Design the reinforcement learning signal r(t) according to the following formula:

[0035]

[0036] Among them, U ac (t) is the AC output voltage of the inverter at time t; is the grid voltage at time t; u(t) is the duty cycle of the switching tube at time f, which is the system control quantity; r(t) is the reinforcement learning signal at time t; the learning ...

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Abstract

The invention discloses a control method for a grid-connected inverter used in a wave power generation system. Firstly, a mathematical model of the grid-connected inverter of the wave power generation system is established, and the inverter is realized by controlling the duty ratio of the power tube switch of the inverter. The output voltage of the inverter can track the reference voltage of the power grid without difference. In order to achieve fast error-free tracking, the present invention adopts the global fast terminal sliding mode control strategy based on the reinforcement learning algorithm, and through the interaction between the reinforcement learning algorithm and the environment, the fast terminal sliding mode control strategy is compensated in real time, so that the inverter Interference has self-learning ability, which enhances the robustness and stability of the system.

Description

technical field [0001] The invention relates to the technical field of inverter control for a wave power generation system, in particular to a reinforcement learning algorithm and a terminal sliding mode control algorithm. Background technique [0002] Wave energy is an important part of ocean energy, its reserves are huge, and its development and utilization have broad prospects. my country is a large ocean country, and the available wave energy resources are extremely rich. The development and utilization of these wave energy resources is one of the important contents of the development and utilization of marine renewable energy in my country. The main means of wave energy development is wave power generation. The wave power generation device is built on the sea, and the electric energy is transmitted to the shore through the submarine composite cable. Since the wavelength, wave height, and wave cycle are all changing, the energy of the wave is unstable and discontinuous....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0025
Inventor 余海涛王琦董坤
Owner SOUTHEAST UNIV
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