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VSG control method based on dynamic droop coefficient

A control method and coefficient technology, applied to AC network circuits, electrical components, circuit devices, etc., can solve problems such as the contradiction between dynamic response speed and output frequency voltage characteristics, and achieve improved dynamic response speed, smooth control curve, and fast response time Effect

Inactive Publication Date: 2020-02-11
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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Problems solved by technology

[0005] The invention provides a VSG control method based on the dynamic droop coefficient, which solves the problem that the droop coefficient is constant in the existing VSG, and there is a contradiction between the dynamic response speed and the output frequency voltage characteristic

Method used

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  • VSG control method based on dynamic droop coefficient
  • VSG control method based on dynamic droop coefficient

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Embodiment Construction

[0021] The specific implementation of the present invention will be described in further detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0022] Based on the synchronous inverter scheme, the present invention designs a VSG control method based on dynamic droop coefficient adjustment by analyzing the VSG steady-state and dynamic characteristics, selecting active frequency droop coefficient and reactive voltage droop coefficient as adjustment objects , so that in the off-grid operation mode, in the face of load fluctuations, the droop coefficient of the VSG changes adaptively with the cosine function, the range of frequency and voltage changes is small, and the response time is fast, thereby ensuring the stability of the system. The control method is as follows:

[002...

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Abstract

The invention discloses a VSG control method based on a dynamic droop coefficient. Based on a synchronous inverter scheme, by analyzing the steady-state and dynamic characteristics of a VSG and selecting an active frequency droop coefficient and a reactive voltage droop coefficient as adjustment objects, a VSG control method based on dynamic droop coefficient adjustment is designed to make the droop coefficient of the VSG adaptively vary with a cosine function in the event of load fluctuations in an off-grid operation mode. The VSG control method achieves a small frequency and voltage variation range and short response time, thereby ensuring system stability.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically, the invention relates to a VSG control method based on a dynamic droop coefficient. Background technique [0002] Distributed power generation is one of the typical methods of new energy applications, which has the advantages of flexibility and environmental protection; but the fractional [0003] Intermittent, fluctuating and large-scale grid-connected power generation will deteriorate power quality and pose severe challenges to the safe and stable operation of the power grid. In order to improve the ability of the grid to accept distributed energy, a virtual synchronous generator control strategy is proposed, so that the inverter simulates the external characteristics of the synchronous generator by adding virtual moment of inertia and damping characteristics, reducing the change of grid frequency and voltage, thereby weakening the The adverse impact of distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/24
CPCH02J3/24H02J3/381H02J3/46
Inventor 高文根胡田张港於跃吴铭辉
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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