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Control method of grid-connected inverter 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: 2018-08-21
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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  • Control method of grid-connected inverter for wave power generation system
  • Control method of grid-connected inverter for wave power generation system
  • Control method of grid-connected inverter 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 of a grid-connected inverter for a wave power generation system. According to the method, the mathematical model of the grid-connected inverter of the wave power generation system is established; and the error-free tracking of a power grid reference voltage by the output voltage of the inverter is realized through controlling the duty ratio of the power tube switch of the inverter. In order to achieve fast and error-free tracking, a reinforcement learning algorithm-based global fast terminal sliding mode control strategy is adopted; and the fast terminal sliding mode control strategy is compensated in real time by means of interaction between a reinforcement learning algorithm and the environment, so that the inverter has self-learning capacity foroutside interference, and therefore, the robustness and stability of the system can be enhanced.

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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IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0025
Inventor 余海涛王琦董坤
Owner SOUTHEAST UNIV
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