Negative-Sequence Reactive Power Control and Active Power Control for DC/3ϕ Power Conversion Using Single-Delta Bridge-Cell (SDBC) Converter
This paper focuses on a DC/<inline-formula> <tex-math notation="LaTeX">$3\phi $ </tex-math></inline-formula> power converter combining the single-delta bridge-cell (SDBC) converter and a single-phase PWM converter via a medium-frequency transformer for voltage flick...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10982153/ |
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| Summary: | This paper focuses on a DC/<inline-formula> <tex-math notation="LaTeX">$3\phi $ </tex-math></inline-formula> power converter combining the single-delta bridge-cell (SDBC) converter and a single-phase PWM converter via a medium-frequency transformer for voltage flicker mitigation. In this application, the converter is required to produce negative-sequence reactive power and active power in addition to positive-sequence reactive power and harmonic power. However, in conventional SDBC-based STATCOM, steady-state active power control is not possible, and furthermore, it suffers from large voltage fluctuation in the DC-capacitor voltages when low-frequency active power is controlled. On the other hand, the proposed converter is capable of controlling active power and has been confirmed to operate at 37% of the rated reactive power, demonstrating its adaptability for flicker compensation. Nevertheless, the proposed converter still faces two challenges when intended for flicker compensation operation. The relationship between the deliverable negative-sequence reactive power and active power has not been clarified in previous research. Additionally, the operation of the system during low-frequency active power control has not been analyzed. This paper attempts to solve the first problem by conducting theoretical power analysis when negative-sequence reactive power is controlled by supplying circulating current from the single-phase converter. The second problem is also addressed by presenting current reference values for low-frequency active power control and conducting circuit analysis. The validity of the control and theoretical analysis developed in this paper is experimentally verified using a 100-V, 5-kVA downscaled model. |
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| ISSN: | 2169-3536 |