Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 10, Issue 4, Pages 3697-3710Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2021.3065235
Keywords
Capacitors; Topology; Power electronics; Switches; Voltage fluctuations; Network topology; Fluctuations; Fluctuating power elimination; modular multilevel converter (MMC); resonant push-pull converter ((RPC)-C-2); solid-state transformer (SST); triple-port (TP); voltage self-balancing
Categories
Funding
- Key Research and Development Program of Hebei Province [19214405D]
- National Natural Science Foundation of China [51677162]
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A triple-port solid-state transformer (TP-SST) topology based on the combination of modular multilevel converter (MMC) and resonant push-pull converter ((RPC)-C-2) is proposed in this article. By utilizing a simple open-loop control scheme, the TP-SST is able to automatically balance capacitor voltages and cancel fluctuating power based on three-phase symmetry, significantly reducing capacitor size and simplifying system control.
A triple-port solid-state transformer (TP-SST) topology based on the combination of modular multilevel converter (MMC) and resonant push-pull converter ((RPC)-C-2) is proposed in this article. For an MMC-based SST, large size capacitor caused by fluctuating power and voltage imbalance of MMC submodules (SMs) are two important problems. Based on a simple open-loop control scheme, the (RPC)-C-2-based high-frequency links (HFL) are characterized by a voltage source with fixed conversion ratio and low impedance, and then can form a power free-coupling channel between SMs and realize the automatic balance of capacitors voltage. Moreover, the fluctuating power can cancel each other based on their three-phase symmetry, which obviously reduces the capacitance size, and the second-order harmonic circulating current of the arms could be eliminated at the same time, greatly simplifying the control of system. In this article, the working principle of TP-SST is described, and the methods of HFL realizing SM voltage ripple elimination and self-balancing are analyzed in detail. In addition, a comparison with traditional SST in efficiency and cost is presented. Finally, simulation and experimental results verify the correctness and effectiveness of the proposed topology scheme.
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