A Virtual Synchronous Generator Method with Moment of Inertia and Damping Self-optimization

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.

Description

technical field [0001] The present invention relates to the technical field of smart grid, in particular to a method based on a virtual synchronous generator (VSG+) with moment of inertia and damping self-optimization, wherein the English name of the virtual synchronous generator is Virtual Synchronous Generator, referred to as 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 regulation. The grid provides the necessary voltage and ...

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Problems solved by technology

[0005] However, in the above embodiments, the moment of inertia and damping in the power grid cannot be adjusted adaptively. In order to better realize the grid connection of the distributed photovoltaic power generation system, a better solution is needed to improve the grid stability domain

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