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FIR band-pass filter and parameter adaptive AFDPF combined island detection method

A technology of band-pass filtering and island detection, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as poor anti-interference, and achieve the effect of reducing influence, preventing misjudgment, and good anti-interference

Inactive Publication Date: 2018-07-27
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

This type of method has the advantages of eliminating detection blind spots and greatly reducing electric energy pollution, but the anti-interference is poor, and there are many possibilities of misjudgment and missed detection. Rigorous analysis of island feature quantities and classification methods is required to make reasonable choices.

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  • FIR band-pass filter and parameter adaptive AFDPF combined island detection method
  • FIR band-pass filter and parameter adaptive AFDPF combined island detection method
  • FIR band-pass filter and parameter adaptive AFDPF combined island detection method

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Embodiment Construction

[0042] Hereinafter, an exemplary embodiment of the present invention will be described. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made during the development of any such actual implementation in order to achieve the developer’s specific goals, for example, compliance with system and business-related constraints, and these The restriction conditions may vary depending on the implementation. In addition, it should also be understood that, although the development work may be very complicated and time-consuming, for those skilled in the art who benefit from the disclosure of the present invention, such development work is only a routine task.

[0043] Here, it should be noted that in order to avoid obscuring the present invention due to unnecessary details, other details that are not relevant to the present invention a...

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Abstract

The invention provides an FIR band-pass filter and parameter adaptive AFDPF combined island detection method, and belongs to the field of anti-island protection of distributed power grid-connected systems. By real-time sampling and analysis of common coupling point voltage, an FIR band-pass filter is used for extracting island features as a pre-judgment condition for island generation, which avoids harmonic pollution caused by introduction of disturbance by an active frequency shift algorithm with positive feedback during normal grid connection. In order to solve the problem that an FIR band-pass filter extraction feature analysis method is easy to misjudge the non-island disturbance, through combination with power grid synchronization features of an AFDDP algorithm, the AFDDP algorithm isstarted after the FIR band-pass filter extracts the features to predict the island generation, AFDDP algorithm positive feedback coefficients are set to achieve the purpose of eliminating detection dead zones according to the frequency and loading condition adaptive adjustment, and finally the PCC point voltage frequency triggers over-frequency protection under the action of APFPF disturbance toachieve island detection.

Description

Technical field [0001] The invention relates to an islanding detection method, in particular to an islanding detection method combining FIR bandpass filtering and parameter adaptive AFDPF, and belongs to the field of anti-islanding protection of distributed power grid-connected systems. Background technique [0002] With the advent of the global new energy era, photovoltaic energy, as today's most ideal renewable clean energy, has received extensive attention for its advantages such as no exhaustion risk, strong adaptability, pollution-free, and high safety factor. One of the most important applications of photovoltaic energy is photovoltaic power generation. Photovoltaic grid connection is the ultimate development trend and inevitable choice of photovoltaic power generation. [0003] With a large number of distributed photovoltaic power generation systems connected to the grid, the requirements for system protection and control continue to increase. Among them, island detection i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 宋立新刘斯琦
Owner HARBIN UNIV OF SCI & TECH
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