A Microprocessor Resource-Saving Dual Active Bridge Control for Startup and Restart of Three-Stage Modular Solid-State Transformer
| Autor: | Abubakar Siddique, Xiangning Xiao, Yonghai Xu, Yunbo Long, Xueyin Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
business.industry
Computer science 020209 energy Energy Engineering and Power Technology 02 engineering and technology Modular design Inrush current law.invention Microprocessor Capacitor law Control theory Control system 0202 electrical engineering electronic engineering information engineering Process control Electrical and Electronic Engineering business Transformer Pulse-width modulation |
| Zdroj: | IEEE Transactions on Power Delivery. 35:1443-1454 |
| ISSN: | 1937-4208 0885-8977 |
| DOI: | 10.1109/tpwrd.2019.2946463 |
| Popis: | The three-stage modular solid-state transformer (SST) is a typical SST with a non-trivial start-up process. Specifically, special controls must be used to reduce the inrush current in the DC/DC stage during the start-up process of these SSTs. For the DC/DC stage based on the widely studied single-phase-shift dual active bridge (DAB), no inner-phase-shift control is required in its normal operations. In this case, using the existing inner-phase-shift control to reduce the inrush current increases the PWM channel requirements of microprocessors and the complexity of the control system. To address this problem, this paper proposes a long-dead-time control with easy implementation to reduce the inrush current without introducing additional PWM channel requirements. Fixed-dead-time and varied-dead-time controls are also proposed to reduce the inrush current when restarting three-stage modular SSTs with small cell capacitors without increasing the PWM channel requirements. The varied-dead-time control is faster than the fixed-dead-time one. The magnitude of the DAB current under these controls is calculated, and the overall time for fulfilling the proposed controls is estimated. The simulation and experiment on a 510 V/380 V 500 kW cascaded-full-bridge SST reveal that the proposed controls can effectively reduce the inrush currents during the start-up and restart processes of SSTs. |
| Databáze: | OpenAIRE |
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