Verification method and experimental device for grid impedance identification

A technology of grid impedance and verification method, which is applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electricity, etc., can solve grid interference, the verification process of grid impedance identification method is complicated, and it is difficult to determine the accuracy of grid impedance identification method, etc. problems, to reduce the computational pressure, simplify the extraction process, and improve security.

Active Publication Date: 2020-04-24
HEFEI UNIV OF TECH
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Problems solved by technology

It is used to solve the complicated verification process of the grid impedance identification method in the case of grid connection due to background harmonics of the grid, it is difficult to determine the accuracy of the grid impedance identification method and the injection of harmonic disturbance or pulse disturbance will bring a greater impact on the normal operation of the grid interference problem

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  • Verification method and experimental device for grid impedance identification
  • Verification method and experimental device for grid impedance identification
  • Verification method and experimental device for grid impedance identification

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Embodiment Construction

[0046] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] figure 1 The structural diagram of the experimental device for verifying the grid impedance identification method, as can be seen from the figure, the experimental device structure includes a voltage source inverter 10 , a grid impedance 20 and a grid impedance identification unit 30 .

[0048] The voltage source inverter 10 includes a DC side 101, a three-phase full-bridge inverter circuit 102 and an LC filter 103, and the filter capacitor C of the DC side 101 inv The output end of the three-phase full-bridge inverter circuit 102 is connected to the input end, and the output end of the three-phase full-bridge inverter circuit 102 is connected to the input end of the LC filter 103, and the output end of the LC filter 103 is connected to the grid impedance 20 is connected to the input terminal.

[0049] The grid impedance 20 is ...

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Abstract

The invention provides a verification method and an experimental device for grid impedance recognition. The experimental device comprises a voltage source inverter (10), a grid impedance unit (20) and a grid impedance recognition unit (30). The specific operation process for verifying grid impedance recognition by the experimental device comprises the following steps: a disturbing signal injection unit (301) injects disturbing signals into an inverter control system, current response signals iga, igb and igc and voltage response signals uga, ugb and ugc of a PCC (point of common coupling) are acquired respectively by a current sensor Hig and a voltage sensor Hug on a grid-connected side, acquired signals are input into a grid impedance calculation unit (305), and grid impedance is obtained through calculation. A grid impedance recognition method can be verified accurately and reliably by the experimental device, and adverse effect on power quality is avoided.

Description

technical field [0001] The invention belongs to the field of power quality and control, and relates to a verification method and an experimental device for grid impedance identification under the condition of not being connected to a grid, and provides a verification method and an experimental device for grid impedance identification in the research of distributed power generation. Background technique [0002] One of the main electrical characteristics of a weak grid is high grid impedance. The increase of grid impedance will change the model order of the controlled object in the control system, affect the gain, bandwidth and control performance of the inverter control loop, and affect the grid-connected PV inverter. Power quality and stable operation are adversely affected. Therefore, accurate grid impedance information is crucial to the operation of the inverter and the stability of the photovoltaic grid-connected system. [0003] The current grid impedance identificatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R27/26G01R27/08
CPCG01R27/08G01R27/2611G01R31/00
Inventor 张兴杨莹李明李飞
Owner HEFEI UNIV OF TECH
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