Baiyan Sun - IEEE Xplore Author Profile

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In order to improve power efficiency of medium voltage photovoltaic dc transmission system, a novel topology based on current source actively commutated converter (ACC) is proposed. It mainly consists of ACC on the medium/low voltage side and uncontrolled rectifier bridge unit. The most significant feature of the topology is that the operating frequency of ACC on the medium voltage side is consist...Show More
With the large-scale centralized development of solar power plants, DC collection systems are gradually replacing traditional AC collection systems with the advantages of higher efficiency and better stability. Currently, most DC/DC converters in photovoltaic (PV) DC collection systems use high-frequency transformers (HFTs), such as DAB and LLC. Wide-bandgap devices such as SiC and GaN promote an ...Show More
In order to improve power quality and reduce the difficulty of power semiconductor devices in series, a multilevel current source actively commutated converter (ACC) is proposed in this paper. It mainly consists of several power modules with series connection on dc current (DC) side and parallel connection on alternating current (AC) side. Each module output three-level square wave current with di...Show More
A dual active bridge series resonant converter (DABSRC) is proposed with the isolation of an air-core high frequency transformer (ACT) in this paper. It reduces the weight of the transformer without the magnetic core which improves the gravimetric power density of DABSRC. It adopts crossed figure-eight shaped windings to ensure high coupling capability of ACT. In addition, the simplified ACT T-typ...Show More
A power decoupling control for wind power converter based on series-connected modular multilevel converter (SCMMC) and open-winding permanent magnetic synchronous generator (OW-PMSG) is proposed in this article. The power converter based on SCMMC and OW-PMSG achieves medium voltage direct conversion and transmission and has higher dc-bus voltage compared with conventional MMC, which makes it a pro...Show More
The modular multilevel converter (MMC) has been proven to be an effective solution for grid-tied applications with medium/high voltage ratings. The MMC contains a large amount of floating capacitors, which require the voltage balancing control. The voltage balancing control complexity is normally increased with the number of floating capacitors. As a result, the computation burden of the controlle...Show More
This paper proposes a capacitor-isolated balancing circuit (CIBC) for battery modules in grid-tied battery energy storage system (BESS). The grid-tied converter in the BESS consists of three star-connected H bridges with lower dc bus voltage compared with three-phase converter. To realize required voltage and power, cells are series connected to form battery modules which are connected in series f...Show More
A series multilevel converter (SMC) for permanent magnetic synchronous generator (PMSG) in wind power system is presented and a phase dc bus voltage fluctuation suppression method is proposed in this paper. Three phases of the SMC are series connected at dc side to reduce the number of switches compared with conventional modular multilevel converter. The phase dc bus voltage fluctuation suppressio...Show More
DC transformers are essential for dc grids to interconnect different dc networks. This article proposed a high-voltage dc transformer, which consists of two diode-clamped modular multilevel converters (DCM2Cs) front-to-front connected with a medium-frequency transformer. The DCM2C is prominent for its simplified voltage balancing control using clamping circuits. However, a voltage controller and c...Show More
This article proposes a voltage-adjustable capacitor isolated solid-state transformer (ACISST) to link the medium-voltage direct current distribution and low-voltage direct current distribution. Compared with traditional isolated bidirectional dc-dc converter, the proposed ACISST does not contain high-frequency transformer in base modules (BMs). The galvanic isolation between the primary side and ...Show More
A novel wind energy conversion system (WECS) based on series-connected converter is proposed in this paper. In multi-phase series-connected converter, the de sides of three phase are series-connected to reduce the number and voltage stress of power switches and dv/dt at ac side. The insulation requirements for the generator is different from that of star-connected generator with two-level, three-p...Show More
Modular multilevel converters (MMC) have shown a great potential in the area of medium-voltage drives, for it can produce excellent output waveform with low average switching frequencies. A key issue of MMC is that it requires a complex voltage balancing method to balance the capacitor voltage of each submodule (SM). In this paper, a medium-voltage motor drive based on diode-clamped modular multil...Show More