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YANG Ying,ZHANG Xing,LI Ming.Grid Impedance Detection Method under Unbalanced and Harmonic Grid Voltage Based on Multiple Complex Coefficient Filters[J].JOURNAL OF POWER SUPPLY,2018,16(2):69-75
Grid Impedance Detection Method under Unbalanced and Harmonic Grid Voltage Based on Multiple Complex Coefficient Filters
Received:November 29, 2017  Revised:February 26, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.69
Keywords:grid impedance  multiple complex coefficient filters  uncharacteristic harmonic injection
Fund Project:Project Supported by National Key R&D Program of China
        
AuthorInstitutionEmail
YANG Ying School of Electrical Engineering and Automation, Hefei University of Technology, Hefei , China 1014334465@qq.com
ZHANG Xing School of Electrical Engineering and Automation, Hefei University of Technology, Hefei , China
LI Ming School of Electrical Engineering and Automation, Hefei University of Technology, Hefei , China
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Abstract:
      For the purpose of acquiring the accurate value of grid impedance rapidly under unbalanced grid voltage and background harmonics, a grid impedance detection method is proposed based on multiple complex coefficient filters(MCCF) and uncharacteristic harmonic injection. MCCF is applied to accurately extract the uncharacteristic harmonic components of the voltage and current at the point of common coupling, and further calculate the resistive and inductance components of grid impedance. The basic principle and design method for extracting uncharacteristic harmonics through MCCF are studied, and the optimization design of MCCF parameters is performed from aspects of extraction accuracy and dynamic performance. Finally, simulation results verify the feasibility and effectiveness of the proposed grid impedance detection method.
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