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Detection method of positive sequence voltage phase of fundamental wave for power grid

A technology of fundamental positive sequence and voltage phase, which is applied in the detection field, can solve problems such as fundamental positive sequence active and reactive current detection errors, and achieve the effect of improving quality and reactive compensation effect

Active Publication Date: 2015-06-17
JINCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER +1
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Problems solved by technology

In engineering, when the three-phase voltage of the power grid is asymmetrical or distorted, the voltage will contain negative sequence components and zero sequence components, that is, there is a phase difference φ between the phase of the grid voltage and the phase of the positive sequence component of the voltage fundamental wave, and this phase difference will Cause detection error of fundamental positive sequence active and reactive current

Method used

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  • Detection method of positive sequence voltage phase of fundamental wave for power grid
  • Detection method of positive sequence voltage phase of fundamental wave for power grid
  • Detection method of positive sequence voltage phase of fundamental wave for power grid

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Embodiment Construction

[0028] The problem to be solved by the invention is: real-time detection of the initial phase angle of the positive sequence component of the fundamental voltage. Considering the generality of grid voltage asymmetry and distortion in engineering, set the three-phase voltage e a , e b , e c They are:

[0029] ,

[0030] In the formula: E represents the effective value of the voltage, the first subscript represents the sequence component (1 is the positive sequence, 2 is the negative sequence, 0 is the zero sequence), and the second subscript represents the harmonic order. then e a , e b , e c ,,go through

[0031] ,

[0032] Transform to α-β two-phase, get formula:

[0033] ,

[0034] The two-point detection method used in this paper means: the e α 、e β go through

[0035] ,

[0036] The coordinates are transformed into and after

[0037] ,

[0038] The coordinates are transformed into :

[0039] ,

[0040] ,

[0041] with After passing ...

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Abstract

The invention relates to a detection method of a positive sequence voltage phase of a fundamental wave for a power grid, aiming at solving the problem in the prior art that the initial phase angle of the positive sequence voltage of the fundamental wave cannot be detected when the voltage of the power grid is asymmetric or distorted. The technical scheme comprises the steps of: first, performing different coordinate conversions twice on the voltage of the power grid to obtain the value of the direct current component of an active voltage when the voltage of the power grid is asymmetric or distorted; and then extracting the initial phase angle of the positive sequence voltage component of the fundamental wave from the direct current component of the active voltage. The invention can accurately detect the initial phase angle of the positive sequence voltage of the fundamental wave in real time when the voltage of the power grid is asymmetric or distorted, and detect the instructional current by sine and cosine signals containing the initial angle information to obtain an accurate detection result so as to improve the reactive compensation effect of a static synchronous compensator of a distribution network and improve the quality of power supply of the power grid.

Description

technical field [0001] The invention relates to a method capable of accurately detecting the initial phase angle of the fundamental positive sequence voltage of a power grid when the voltage of the grid is distorted, and belongs to the detection technical field. Background technique [0002] With the development of modern science and technology, a large number of loads with nonlinear characteristics are put into power grid operation, which brings serious harmonic pollution and dynamic reactive load to the power grid. If the reactive power of these loads cannot be compensated in time, it will cause the voltage reduction and fluctuation of the distribution network, and seriously deteriorate the quality of power supply. With its powerful functions and excellent performance, distribution network static synchronous compensator (D-STATCOM) has gradually become the development direction of distribution network reactive power compensation and power quality control devices at this st...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
Inventor 王生明张栋焦广旭段成群梁静
Owner JINCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER
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