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Method and device for estimating positive sequence voltage component and negative sequence voltage component of power grid

A positive-sequence voltage and negative-sequence voltage technology, used in circuit devices, CAD circuit design, electrical components, etc., can solve problems such as slow response speed, achieve fast dynamic response speed, excellent steady-state accuracy, and achieve global asymptotic convergence. Effect

Active Publication Date: 2021-03-23
XIDIAN UNIV
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Problems solved by technology

[0003] To sum up, the problems existing in the prior art are: the existing methods for estimating positive-sequence voltage components and negative-sequence voltage components of the grid have a slow response speed and can only achieve local gradual convergence

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  • Method and device for estimating positive sequence voltage component and negative sequence voltage component of power grid
  • Method and device for estimating positive sequence voltage component and negative sequence voltage component of power grid

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] The invention has a fast dynamic response speed, can realize global gradual convergence, and has excellent steady-state precision under the condition of changing the grid frequency.

[0041] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 As shown, the method for estimating the positive sequence voltage component and the negative sequence voltage component of the power grid provided by the embodiment of the present invention includes the following steps:

[0043] S101: collect the three-phase voltage of the...

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Abstract

The invention belongs to the technical field of power grids, and discloses an estimation method and device for the positive sequence voltage component and the negative sequence voltage component of apower grid. A collected power grid voltage signal is subjected to Clark transformation, a Marino-Tomei observer is established on the basis of the signal obtained by transformation, power grid frequency and an intermediate variable are observed so as to calculate the positive sequence voltage component and the negative sequence voltage component, and the amplitude and the phase angle of the positive sequence voltage component and the negative sequence voltage component of the power grid can be estimated. The estimation method and device for the positive sequence voltage component and the negative sequence voltage component of the power grid comprises the following steps that: collecting the three-phase voltage of the power grid; carrying out Clarke transformation; obtaining power grid voltage; constructing the observer; carrying out variable substitution; calculating the positive sequence voltage component and the negative sequence voltage component of the power grid; and calculating the amplitude and the phase angle of the positive sequence voltage component and the negative sequence voltage component of the power grid. The method is high in dynamic response speed, can realize global asymptotic convergence and is high in steady accuracy under a situation that power grid frequency is changed.

Description

technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a method and device for estimating positive-sequence voltage components and negative-sequence voltage components of a grid. Background technique [0002] In grid technology, in order to achieve grid synchronization, it is necessary to estimate the real values ​​of the positive sequence voltage component and negative sequence voltage component in the grid according to the measured grid voltage. The existing methods for estimating positive-sequence voltage components and negative-sequence voltage components in power grids are mainly realized through phase-locked loops, such as the three-phase digital phase-locked loop proposed in "Three-phase Digital Phase-Locked Loop Based on Synchronous Reference Coordinate System" and "Based on Specific Harmonic The phase-locked loop based on Fourier analysis proposed in "Eliminating Grid-connected PLL Technology" can realize the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/30H02J3/00
CPCG06F30/367H02J3/00H02J2203/20Y02E60/00
Inventor 戴志勇李建文马伯渊张菊香张杰侯叶
Owner XIDIAN UNIV
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