DOI:https://doi.org/10.1007/s40565-019-0520-y |
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Analysis of unbalanced clustered voltage and control strategy of clustered voltage balancing for cascaded H-bridge STATCOM |
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Net amount: 561 |
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Author:
Yu JIN1, Jianze WANG1, Yiqi LIU2, Xinagyu SAI1, Yanchao JI1
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Author Affiliation:
1 School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin, China 2 College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin, China
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Abstract: |
To explore the clustered voltage balancing mechanism of the cascaded H-bridge static synchronous compensator (STATCOM), this paper analyzes the causes of unbalanced clustered voltage. The negative-sequence current caused by the compensation of unbalanced reactive power or detection and control errors and the zero-sequence voltage caused by voltage drift of the STATCOM neutral point contribute to unbalanced clustered voltage. On this basis, this paper proposes a control strategy to inject negative-sequence current and zero-sequence voltage simultaneously. The injection of negative-sequence current may cause current asymmetry in the grid, and the zero-sequence injection has a relatively limited balancing ability in the clustered voltages. The proposed control strategy can not only generate a faster balancing response than the traditional zero-sequence voltage injection method, but also lower the extent of current asymmetry compared with the traditional negative-sequence current injection method. Then, the negative-sequence current and zero-sequence voltage injection are further transformed into the dq frame to establish a unified frame. The effectiveness of the proposed control strategy is verified by the simulation and experimental results. |
Keywords: |
Cascaded static synchronous compensator (STATCOM), Clustered voltage, Control strategy, Negative-sequence current, Zero-sequence voltage |
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Online Time:2019/11/27 |
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