Business ship distributed energy pre-grid-connection method based on model-free adaptive control

A model-free self-adaptive, distributed energy technology, applied in AC network circuits, single-grid parallel feeding arrangements, electrical components, etc., which can solve problems such as slow grid-connected response speed, pre-grid-connected oscillation, and measurement data delay. , to achieve the effect of improving the generation of grid-connected inrush current, satisfying stable grid connection, and improving and reducing

Pending Publication Date: 2021-10-29
QINGDAO UNIV OF SCI & TECH
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The difference between the reference value and the actual value is fed back to the virtual synchronous generator algorithm through the PI controller to form a closed loop, so as to realize the synchronization between the inverter and the grid frequency, voltage amplitude and phase, but the participation of the phase-locked loop not only takes time to Adjust the parameters of the phase-locked loop, and there is a problem of measurement data delay, so it is difficult to ensure accuracy and reliability in the environment of ship load switching
In addition, the existence of multiple phase-locked loops in the ship's virtual synchronous generator system will cause interlocki

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  • Business ship distributed energy pre-grid-connection method based on model-free adaptive control
  • Business ship distributed energy pre-grid-connection method based on model-free adaptive control
  • Business ship distributed energy pre-grid-connection method based on model-free adaptive control

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[0096] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0097] The present invention considers the problem of merchant ship distributed energy grid-connected oscillation and the problem of slow response speed of the traditional pre-grid control strategy when large-scale merchant ships dock at the port to access shore power. By combining the virtual power-based virtual synchronous generator pre-grid control method, A pre-grid-connection method for merchant marine distributed energy resources based on model-free adaptive control is proposed. In the following, a method for pre-grid-connection of merchant marine distributed energy resources based on model-free adaptive control is described in detail.

[0098] see Figure 1 to Figure 8 It is a pre-grid-connection method of merchant ship distributed energy resources based on model-free adaptive control. This method calculates the virtual power online by using a method bas...

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Abstract

The invention discloses a commercial ship distributed energy pre-grid-connection method based on model-free adaptive control, and relates to the technical field of micro-grid control. The method comprises the steps of acquiring three-phase phase voltage of a ship virtual synchronous generator and shore power; performing park change on the three-phase phase voltage to obtain a voltage value under a two-phase rotating coordinate system; calculating the phase difference between the shore power and the ship virtual synchronous generator on line; establishing a virtual power equation between the shore power and the ship virtual synchronous generator; carrying out dynamic linearization treatment and obtaining a data model; calculating a virtual power pseudo partial derivative estimation rate; designing a virtual power model-free adaptive controller; and through model-free adaptive control, improving virtual synchronous generator pre-grid-connection control based on virtual power to realize commercial ship distributed energy pre-grid-connection. According to the invention, the response speed of the commercial ship distributed energy grid connection is optimized, the generation of grid connection impact current when the commercial ship distributed energy is connected to the shore power is improved, and the oscillation problem of active power and reactive power is reduced.

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Owner QINGDAO UNIV OF SCI & TECH
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