Overrunning virtual synchronous generator (VSG+) method with rotary inertia and damping self-optimization-trending

A technology of virtual synchronization and moment of inertia, applied in photovoltaic power generation, single-net parallel feeding arrangement, etc., can solve the problem that the moment of inertia and damping of the power grid cannot be adjusted adaptively
CN105186554AActive Publication Date: 2015-12-23XUJI GRP +2
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
XUJI GRP
Publication Date
2015-12-23

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Abstract

The invention discloses an overrunning virtual synchronous generator (VSG+) method with rotary inertia and damping self-optimization-trending. The method comprises the following steps: step one, a mechanical equation and an electromagnetic equation of a virtual synchronous generator (VSG) are established; step two, the rotary inertia J and damping D in a VSG model are increased as |delta f| is increased, wherein delta f is an absolute value of a difference between a power network rated frequency and the actual frequency of the VSG; and step three, according to self-adjustment of the rotary inertia J and the damping D, closed-loop control is performed on the |delta f|, and finally, grid connection of a distributed photovoltaic power generation system is realized. According to the VSG+ method with the rotary inertia and damping self-optimization-trending, provided by the invention, the rotary inertia J and the damping D in the VSG are adaptively adjusted as the |delta f| changes, the rotary inertia J and the damping D after adjustment then perform feedback regulation on the |delta f|, and finally, zero impact during grid connection of photovoltaic inverters is realized, such that the acceptance capability of a power network for the distributed photovoltaic power generation system is improved.
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Description

technical field

[0001] The present invention relates to the technical field of smart grid, in particular to a method for surpassing a virtual synchronous generator (VSG+) with moment of inertia and damping self-optimization, wherein the English name of virtual synchronous generator is Virtual Synchronous Generator, referred to as VSG; beyond virtual synchronous generator for short VSG+. Background technique

[0002] As the global energy crisis and climate issues become increasingly prominent, solar energy, as a clean renewable resource, has been more and more widely used and developed. Distributed photovoltaic power generation systems have begun to be connected to the grid on a large scale. Penetration is also increasing. However, distributed photovoltaic power generation systems contain a large number of grid-connected inverters, especially conventional grid-connected inverters with fast response speed, almost no moment of inertia, and difficulty in participating in grid r...

Claims

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