A Modified DC Power Electronic Transformer Based on Series Connection of Full-Bridge Converters

Zhang, Jiepin; Liu, Jianqiang; Yang, Jingxi; Zhao, Nan; Wang, Yan; Zheng, Trillion Q.

doi:10.1109/tpel.2018.2842728

Cited by 80 publications

(36 citation statements)

References 37 publications

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“…By substituting (11) and (14) to (9), the dynamic of the circulating currents can be expressed as follows:…”

Section: Mathematical Model Of Circulating Currents Based On Circumentioning

confidence: 99%

“…Connecting the networks, stabilizing the load voltage and coordinating the operation between them are challenges for the receiver on the island. The receiver is required to be equipped with the capability of bidirectional power flow between the ports, providing higher power density, simpler control strategy, and transport convenience [9]- [13].…”

Section: Introductionmentioning

confidence: 99%

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Single-Stage Control System of I-MMC-Based Island MVDC Link Receiver With Multiple Modulation Freedoms

et al. 2020

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In the medium-voltage AC/DC distribution networks with distributed renewable sources on islands, a multi-port receiver is the key factor for hybrid power conversion. However, the most used modular multilevel converter (MMC)-based multi-port converters (MCs) face the coordination and complexity challenges due to their double-stage control system and voltage-balancing control of capacitors. In particular, the control system is more unstable and complicated when the control of circulating currents is considered. In this paper, an isolated modular multilevel converter (I-MMC) is used as a receiver, and a unified coordinated control scheme based on the multiple modulation freedoms is proposed. Due to the voltage clamping of high-frequency transformers, there is no concern of the capacitors' voltage-balancing control. Based on the proposed single-stage control system, the unified coordinated control scheme solves the coordination problem of the MMC-based MCs. The multiple modulation freedoms corresponding to an AC port, two DC ports, and three-phase circulating currents can independently control respective targets. The control structure is simplified, while the control freedoms are ensured. Experimental results confirming the performance of the designed control system is shown. INDEX TERMS Circulating currents control, isolated modular multilevel converter, medium AC/DC distribution networks, multiple modulation freedoms, single-stage control system, unified coordinated control scheme.

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“…By substituting (11) and (14) to (9), the dynamic of the circulating currents can be expressed as follows:…”

Section: Mathematical Model Of Circulating Currents Based On Circumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-Stage Control System of I-MMC-Based Island MVDC Link Receiver With Multiple Modulation Freedoms

et al. 2020

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“…Power electronics have proven to be an important technology for the substantial improvement of power grid performance, and power electronic equipment has been extensively used in power systems [1] , [2] , [3] , [4] . With the improvement of the manufacturing technology of power electronic devices, many new technologies have been developed [5] , [6] , [7] , [8] , [9] .…”

Section: Introductionmentioning

confidence: 99%

Design and test of a novel power electronic device for phase sequence exchange technology

Huang

et al. 2021

International Journal of Electrical Power & Energy Systems

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“…Fully-controlled SST operates bidirectionally and transfers energy to both sides. Different types of SSTs have been presented until now, and many papers have been published that most of them are related to traction systems [2,3,[11][12][13][14][15][16][17][18][19][20][21][22][23]. These efforts yield new topologies and new control systems.…”

Section: Introductionmentioning

confidence: 99%

In‐depth study of the application of solid‐state transformer in design of high‐power electric vehicle charging stations

Eshkevari¹,

Mosallanejad

Sepasian

2020

IET Electrical Systems in Transportation

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Solid-state transformers (SST) will play an important role in future electric power distribution. The SST usually used for traction and transportation systems. However, it can be employed for other applications. For example, electric vehicles (EVs) are confronting the increased demand now, and the service provider must expand the infrastructures such as the high-power EV charging stations in urban areas. One solution for designing a high-power charging station is the SST-based charging stations, which can be connected to the distribution network. This study proposes an SST-based EV charging station, which is connected to the 20 kV catenary without any low-frequency transformer and provides the necessary power for connected EVs without affecting the grid power quality. The proposed EV charging station has high flexibility such that it can be integrated with distributed generation. It also provides vehicle-to-grid, grid-to-vehicle and sun-to-vehicle features. Besides, it can inject reactive power to the grid based on its free capacity. This study also proposes an advance virtual flux predictive power controller to improve the immunity of this structure against voltage harmonics. Exact simulations have been done for a three-phase 20 kV/ 600 V/360 kVA station with different scenarios. Results verify the performance of this infrastructure.

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A Modified DC Power Electronic Transformer Based on Series Connection of Full-Bridge Converters

Cited by 80 publications

References 37 publications

Single-Stage Control System of I-MMC-Based Island MVDC Link Receiver With Multiple Modulation Freedoms

Single-Stage Control System of I-MMC-Based Island MVDC Link Receiver With Multiple Modulation Freedoms

Design and test of a novel power electronic device for phase sequence exchange technology

In‐depth study of the application of solid‐state transformer in design of high‐power electric vehicle charging stations

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