A method for judging the transient power angle stability of a virtual machine

A transient power angle stabilization, virtual machine technology, applied in the field of electric power, can solve problems such as sudden increase in the output reactive power of the virtual machine, reduction of the potential in the virtual machine, and urgent research on the transient stability of the virtual machine, so as to improve the stability of the virtual machine. sexual effect

Inactive Publication Date: 2019-05-10
HUNAN UNIV
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Problems solved by technology

However, under large disturbance conditions such as short-circuit faults, the transient stability of virtual machines still needs to be studied urgently.
[0004] In a transient process such as a short-circuit fault, the sudden drop of the grid voltage causes a sudden increase in the output reactive power of the virtual machine, and then reduces the internal potential of the virtual machine through the virtual machine reactive power-voltage control loop, affecting the transient stability of the system

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  • A method for judging the transient power angle stability of a virtual machine
  • A method for judging the transient power angle stability of a virtual machine
  • A method for judging the transient power angle stability of a virtual machine

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[0026] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0027] Embodiments of the present invention provide a virtual machine, such as figure 1 As shown, the virtual machine 100 is connected to the grid 400 through the line 200 and the transformer 300 . The virtual machine 100 includes a DC micro-source 101 and a DC / AC converter 102 for power conversion. The DC micro-source 101 includes, but is not limited to, DC power sources such as energy storag...

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Abstract

The embodiment of the invention discloses a method for judging the stability of a transient power angle of a virtual machine. The method comprises obtaining a Lyapunov energy function; determining anunstable balance point (us, 0) of the system at the moment; acquiring a parameter value of the system at the moment; according to the parameter value and the Lyapunov energy function of the system atthe moment, calculating the Lyapunov energy function; determining a total energy value Vt of the system at the moment; according to an unstable balance point (us, 0) and a Lyapunov energy function, calculating a Lyapunov energy function; determining the system critical energy value Vc at the moment, comparing the system critical energy value Vc with the total energy value Vt, and taking the momentcorresponding to Vc = Vt as the system critical fault clearing time tc, so as to accurately judge the transient power angle stability of the virtual machine and ensure the stability of the virtual machine system in the transient process.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method for judging the transient power angle stability of a virtual machine. Background technique [0002] In recent years, a large number of new energy sources represented by wind energy and solar energy have been connected to the grid. The randomness of new energy, AC-DC mixing, and wide voltage range require power electronic converters to realize power conversion and access to the grid. Under the background of a large number of power electronic converters connected to the power grid, there are hidden dangers in the anti-disturbance ability and safe operation ability of the system. [0003] From the perspective of the power grid, the virtual machine has the output characteristics of a synchronous generator. Therefore, virtual machine technology has received more and more attention and application. Similar to synchronous generators, virtual machines also have serious transient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 帅智康沈超赵峰沈阳程慧婕彭也伦罗安陈燕东
Owner HUNAN UNIV
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