Analysis and Suppression of MMC-RPC Circulating Current Based on SOGI-FLL
In view of the problems of the modular multi-level structure of the new railway power regulator (MMC-RPC), such as the serious influence of internal circulating current on the performance and efficiency of traction power supply system under the non-ideal operating conditions of voltage disturbance,...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2019-03-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128x.2019.02.006 |
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| Summary: | In view of the problems of the modular multi-level structure of the new railway power regulator (MMC-RPC), such as the serious influence of internal circulating current on the performance and efficiency of traction power supply system under the non-ideal operating conditions of voltage disturbance, and even the failure of some power equipment in the power supply system, a new SOGI-FLL frequency-locked loop controller was proposed to cooperate with circulating current on the AC side of the MMC, the PIR controller was used in the suppression side to track and control the internal circulation of MMC-RPC accurately and improve the operation performance of MMC-RPC. When the voltage input signal was disturbed, the new SOGI-FLL could significantly reduce the overshoot of the output angular frequency and improve its response speed compared with the traditional PLL. It effectively solved the problems of inaccurate tracking of harmonic circulating current and poor harmonic circulating current control effect caused by excessive frequency offset of the system when PIR circulating current suppressor was used to control the circulating current. Finally, the MMC-RPC circulation suppression simulation model was built on the MATLAB simulation platform. The simulation results confirmed the superiority and effectiveness of using SOGI-FLL controller and PIR circulation suppressor to track and suppress the MMC-RPC circulation accurately. |
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| ISSN: | 1000-128X |