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Power grid voltage synchronization signal extraction device and method thereof

A technology of grid voltage and extraction device, which is applied in the field of electrical signal detection, can solve the problem that the calculation of instantaneous symmetrical components increases the calculation amount and the complexity of the system structure, and cannot simultaneously satisfy the rapidity, accuracy, frequency adaptability and simplicity of synchronization signals. And other issues

Active Publication Date: 2013-10-16
CHONGQING UNIV
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Problems solved by technology

This structure can effectively filter the influence of grid voltage asymmetry on synchronous signal extraction, but the operation of instantaneous symmetric components increases the computational complexity of the system and the complexity of the system structure
[0009] Therefore, the existing grid voltage synchronization signal extraction device cannot simultaneously meet the requirements of synchronization signal extraction for speed, accuracy, frequency adaptability and simplicity under the condition of grid voltage asymmetry

Method used

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  • Power grid voltage synchronization signal extraction device and method thereof
  • Power grid voltage synchronization signal extraction device and method thereof
  • Power grid voltage synchronization signal extraction device and method thereof

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Embodiment Construction

[0068] Please refer to figure 1 , Is a schematic structural diagram of an embodiment of the grid voltage synchronization signal extraction device provided by the present invention. It includes: α-β static coordinate system conversion circuit T αβ 1. d-q synchronous rotating coordinate system conversion circuit T dq 2. ANF unit 3, negative sequence component extraction unit 4, subtractor I5, subtractor II6, PI regulator 7, integrator I8, proportional arithmetic unit I9 and proportional arithmetic unit II10.

[0069] Among them, α-β static coordinate system conversion circuit T αβ , Mainly used to sample the signal u of the grid voltage a , U b And u c Transform to the α-β stationary coordinate system to obtain the α axis component u of the grid voltage α And β axis component u β .

[0070] Specifically, u a , U b And u c It can be expressed as: u i = U p cos ( ωt + φ p - k i 2 π 3 ) + U n cos ( - ωt + φ n ...

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Abstract

The invention provides a power grid voltage synchronization signal extraction device and a method thereof. The apparatus comprises an alpha-beta static coordinate system conversion circuit Talphabeta, a d-q synchronous rotating coordinate system conversion circuit Tdq, an adaptive wave trap ANF unit, a negative sequence component extraction unit, a subtracter I, a subtracter II, a PI regulator, an integrator I, a proportional arithmetic unit I and a proportional arithmetic unit II. By using the device and the method of the invention, requirements of rapidity, accuracy, frequency adaptability and simplicity of the synchronous signal extraction can be satisfied simultaneously under the condition that a power grid voltage is asymmetrical.

Description

Technical field [0001] The invention relates to the technical field of electrical signal detection, and in particular to a device and method for extracting a grid voltage synchronization signal. Background technique [0002] The most important step in the control of a three-phase grid-connected converter is to extract the synchronization signal of the grid voltage, that is, the amplitude, phase and frequency of the fundamental wave voltage. As the grid voltage asymmetry is a common phenomenon, it has a greater impact on the operation of the three-phase grid-connected converter; therefore, in order to meet the needs of the asymmetric control strategy of the three-phase grid-connected converter, the synchronization signal The extraction also puts forward higher requirements, these requirements include: fast and accurate extraction of synchronization signals in the case of asymmetrical grid voltage, with frequency adaptation and ease of implementation. [0003] At present, in the syn...

Claims

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Application Information

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IPC IPC(8): G01R19/00H03L7/08
Inventor 杜雄郭宏达孙鹏菊周雒维
Owner CHONGQING UNIV
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