Prototype of smart energy router for distribution DC grid

Gao, Fanqiang; Li, Zixin; Wang, Ping; Xu, Fei; Chu, Zunfang; Sun, Zhigang; Li, Yaohua

doi:10.1109/epe.2015.7309404

Cited by 48 publications

(7 citation statements)

References 12 publications

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“…Hence, the reverse of the internal information in ( 14) can be transformed into the calculation of new values of vT1 and vT2. Using the same idea of preprocessing and substituting (20) to (22), the reverse process in (14)…”

Section: Ex Ex Ex S 1t Exmentioning

confidence: 99%

See 1 more Smart Citation

Accelerated Electromagnetic Transient (EMT) Equivalent Model of Solid-State Transformer

Gao

Feng

Ding

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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Accurate and efficient electromagnetic transient (EMT) simulation of various types of solid-state transformers (SST) is extremely time-consuming due to the complex module structure, flexible topology connections, large number of electrical nodes and simulation time-steps limited in the range of micro-seconds. Therefore, it is urgent to develop the EMT equivalent modelling and fast simulation of SSTs for system level studies. Taking the modular multilevel converter (MMC) based SST as an example, this paper proposes an accelerated EMT model which focuses on the equivalence of the dual active bridge (DAB) based high-frequency link (HFL) in the SST. Compared with the existing algorithms, two critical factors of the proposed method that contribute the most to the efficiency improvement are the preprocessing of the nodal admittance equation and the conversion of the short-circuit admittance parameters. The proposed model is verified in PSCAD/EMTDC by comparing it with the detailed EMT model. The results show that the accelerated model is one to two orders of magnitude faster than the detailed model without sacrificing the accuracy. The experiment validation also confirms the validity of the proposed model.

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Section: Ex Ex Ex S 1t Exmentioning

confidence: 99%

“…High-frequency link Combining the advantages of MMCs and the ISOP configuration, a typical MMC based SST is presented in [14], as shown in Fig. 1(a).…”

Section: Introductionmentioning

confidence: 99%

Accelerated Electromagnetic Transient (EMT) Equivalent Model of Solid-State Transformer

Gao

Feng

Ding

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

Self Cite

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show abstract

“…Modular series-parallel technology, limited by the withstand voltage and insulation capabilities of existing power semiconductors, is usually adopted by power electronic transformers (PETs), which reduces the voltage and current stress of each switching device and the power level of each sub-module [4][5][6][7][8]. Therefore, PETs usually have a large number of sub-modules.…”

Section: Introductionmentioning

confidence: 99%

High-Voltage Isolated Multiple Output Auxiliary Power Supply with Output Voltage Self-Regulation

Shi

Chen

et al. 2022

Energies

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Power electronic transformers (PETs) have high voltage isolation requirements and a large number of modules, which requires the auxiliary power supply (APS) to achieve high voltage isolation and multiple outputs. This paper proposes a parameter optimization method for the current source APS applied to PETs, enabling the APS to have multiple output voltage self-regulation capabilities. By optimizing the excitation inductance and leakage inductance for the current transformer of the APS, the excitation current plays a regulating role in energy transmission, thus realizing the self-regulation of the output voltages. The proposed method enables the voltage deviation and voltage change of the output modules to be suppressed under the unbalanced loads and large load fluctuations. Moreover, the APS can still operate normally when a short-circuit or an open-circuit fault occurs on the output sides. Therefore, the stability and reliability of the APS are improved, and the design difficulty of the post-stage voltage regulator circuit is also reduced. Finally, the simulation results are given, and a prototype containing three output modules was built to verify the effectiveness of the proposed parameter optimization method.

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“…The efficiency of an SST can reach 93.72% with a CHB-type input stage [8], which is relatively low for practical application. However, the required number of power electronic switches and high-frequency transformers can be reduced by using an MMC as the input stage, which can significantly reduce the switching losses of power transistors and the cost of the SST [9] as well. Under the voltage level of the distribution network, power loss of the SST isolation stage is usually much higher than that of the input stage.…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids

2020

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A solid state transformer (SST), as a kind of energy router in the Energy Internet, provides a unified access point for AC or DC distributed power subjects. However, the DC-link capacitors inside the SST will suffer huge voltage fluctuations when the output power of the microgrid changes dramatically. With respect to this problem, caused by the random and intermittent characteristics of distributed generation (DG), a hierarchical coordinative control strategy is proposed. Compared with the common independent control, the proposed method not only makes full use of the regulation capacity of super capacitors, but also enhances the dynamic power tracking speed and reduces the speed difference between different stages of an SST. The dynamic voltage response under the proposed method is analyzed in frequency domain and compared with the independent control. To validate the effectiveness of the coordinative control strategy, a simulation model of an SST-based grid-connected DC microgrid system is established, and the topology of the SST is improved. The voltage stability of the DC bus is compared under different control strategies, and the coordinative control strategy is also verified, effectively under transition conditions.

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Prototype of smart energy router for distribution DC grid

Cited by 48 publications

References 12 publications

Accelerated Electromagnetic Transient (EMT) Equivalent Model of Solid-State Transformer

Accelerated Electromagnetic Transient (EMT) Equivalent Model of Solid-State Transformer

High-Voltage Isolated Multiple Output Auxiliary Power Supply with Output Voltage Self-Regulation

A Hierarchical Coordinative Control Strategy for Solid State Transformer Based DC Microgrids

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