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Content Provider | IET Digital Library |
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Author | Lu, Daorong Hu, Haibing |
Abstract | To achieve low cost and compactness, small dc capacitance in dc-link is preferred in the cascaded H-bridge (CHB) static synchronous compensator (STATCOM). However, small dc capacitance will definitely result in high dc-link ripples among three clusters, and thus cause severe third-order harmonic currents under the asymmetric grid. In this study, to mitigate the third-order harmonic currents, a selective component compensation approach for the CHB STATCOM is proposed. To study the effect of the dc-link ripples on the phase currents, sequence component decomposition is employed to derive the relationship between the dc-link ripples and the converter voltages. The relationship reveals that the converter voltages contain positive, negative, and zero sequence components in both fundamental and third-order under the asymmetric grid, while only the positive and negative sequence components in third-order converter voltages result in third-order harmonic currents due to the three-wire system. Therefore, the third-order harmonic currents suppression method is proposed by only compensating the positive and negative components in third-order converter voltages. A 380 V/15 kVA STATCOM prototype is built to verify the proposed control method. |
Starting Page | 5260 |
Ending Page | 5263 |
Page Count | 4 |
Volume Number | 2019 |
e-ISSN | 20513305 |
Issue Number | Issue 18, Jul (2019) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/2019/18 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2019.0095 |
Journal | The Journal of Engineering |
Publisher | The Institution of Engineering and Technology |
Publisher Date | 2019-03-15 |
Access Restriction | Open |
Rights License | Creative Commons Attribution-No Derivs License (http://creativecommons.org/licenses/by-nd/3.0/) |
Subject Keyword | Asymmetric Grid Cascade Control Cascaded H-bridge STATCOM Cascaded H-bridge Static Synchronous Compensator CHB STATCOM Control of Electric Power System Dc Capacitance High Dc-link Ripples Negative Component Negative Sequence Component Other Power Apparatus And Electric Machine Phase Current Positive Component Positive Sequence Component Power Converter Power Grid Power Supplies to Apparatus Power System Economics Power System Managemen Power System Operation Selective Component Compensation Approach Sequence Component Decomposition Static VAr Compensators Third-order Converter Voltage Result Third-order Harmonic Current Suppression Method Voltage Control Zero Sequence Component |
Content Type | Text |
Resource Type | Article |
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