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Method and device for predicting grid-connected transient stability of virtual synchronous generator

A technology of transient stability and virtual synchronization, applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, etc. Predict the effect of high efficiency

Active Publication Date: 2019-11-26
CHINA AGRI UNIV +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 predicting grid-connected transient stability of virtual synchronous generator
  • Method and device for predicting grid-connected transient stability of virtual synchronous generator
  • Method and device for predicting grid-connected transient stability of virtual synchronous generator

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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

The embodiment of the invention provides a method and device for predicting grid-connected transient stability of a virtual synchronous generator. The method comprises the following steps of acquiringthe virtual rotating speed and a virtual power angle of a virtual synchronous generator VSG; inputting the virtual rotating speed and the virtual power angle into a preset transient energy function model, and outputting a transient energy value and the critical clearing time; and predicting the grid-connected transient stability of the VSG according to the transient energy value and the criticalclearing time. According to the method and the device for predicting the grid-connected transient stability of the virtual synchronous generator provided by the invention, a transient energy functionof a one-machine infinite system connected to the VSG is constructed, and the effect of virtual damping is taken into account; the established transient energy function is high in accuracy, the grid-connected transient stability of the virtual synchronous generator is predicted by calculating the transient energy function, the calculation amount is small, the use is convenient, and the predictionefficiency 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...

Claims

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Application Information

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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