Method and device for transient stability prediction of virtual synchronous generator connected to grid

A technology of transient stability and virtual synchronization, applied in the direction of single-grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problem of low efficiency of transient stability prediction

Active Publication Date: 2021-05-04
CHINA AGRI UNIV +4
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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for predicting transient stability of virtual synchronous generators connected to the grid, which are used to solve the technical problem of low efficiency in predicting transient stability in the prior art

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  • Method and device for transient stability prediction of virtual synchronous generator connected to grid
  • Method and device for transient stability prediction of virtual synchronous generator connected to grid
  • Method and device for transient stability prediction of virtual synchronous generator connected to grid

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Embodiment Construction

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0036] figure 1 A schematic diagram of a transient stability prediction method for virtual synchronous generators connected to the grid provided by an embodiment of the present invention, as shown in figure 1 As shown, the embodiment of the present invention provides a transient stability prediction method for a virtual synchronous generat...

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Abstract

Embodiments of the present invention provide a method and device for predicting transient stability of a virtual synchronous generator connected to the grid. The method includes: obtaining the virtual speed and virtual power angle of the virtual synchronous generator VSG; The angle is input to the preset transient energy function model, and the transient energy value and critical cut-off time are output; the transient stability of VSG grid-connected is predicted according to the transient energy value and the critical cut-off time. The method and device for predicting transient stability of a virtual synchronous generator connected to the grid provided by the embodiment of the present invention constructs a transient energy function of a stand-alone infinite system connected to a VSG, and takes into account the influence of virtual damping to establish a transient energy function The accuracy is very high, and the transient stability of the virtual synchronous generator connected to the grid is predicted by calculating the transient energy function. The calculation amount is small, the use is convenient, and the prediction efficiency is high.

Description

technical field [0001] The invention relates to the technical field of distributed power generation, in particular to a method and device for predicting transient stability of a virtual synchronous generator grid-connected. Background technique [0002] Virtual synchronous generator (VSG) technology has developed rapidly in recent years and will gradually become the development direction of new energy in the future. The application of VSG technology may affect the original stability problems of the system or introduce new stability problems. VSG technology mainly uses control means to make new energy power generation simulate the characteristics of traditional synchronous generators, so that new energy power generation can provide the necessary frequency and voltage support for the grid. After the virtual synchronous machine is connected to the grid, it will have a certain impact on the stability of the power system. On the one hand, VSG simulates the characteristics of syn...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/40H02J3/24
CPCH02J3/24H02J3/38H02J3/40
Inventor 巨云涛高振雷为民赵峰刘辉孙大卫程雪坤
Owner CHINA AGRI UNIV
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