High-Speed Electromagnetic Transient (EMT) Equivalent Modelling of Power Electronic Transformers

Xu, Jianzhong; Gao, Chenxiang; Ding, Jiangping; Shi, Xianghua; Feng, Moke; Zhao, Chengyong; Ding, Hui

doi:10.1109/tpwrd.2020.2998498

Cited by 29 publications

(20 citation statements)

References 24 publications

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“…where y11 and y22 represent the input-admittance of the two ports, y12 and y21 represent transfer-admittances, and Y is the short-circuit admittance matrix, jS1 and jS2 represent the independent current sources of the two ports [24]. Since the SST PM is composed of passive components, the port equation in (4) meets the reciprocity characteristics, i.e., y12=y21, which is proved in the next section.…”

mentioning

confidence: 70%

“…Due to the isolated transformer, the two-port characteristics, i.e., i1+i2=0 and i3+i4=0, are satisfied in mathematics [20]. For such isolated networks, 4 types of port parameters are defined in [24] to describe the relationship between the currents and voltages of the input and output ports, as listed in the first column of Table I. Among them, the short-circuit admittance parameters are closely related to the node admittance matrix of the system and can be converted to the other three types.…”

Section: The Proposed Accelerated Modelling Methodsmentioning

confidence: 99%

“…In the newly reported high-speed equivalent modelling algorithm of CHB-based SST [24], the HFL is represented by a two single-port circuit through eliminating the internal nodes and discretizing the isolation transformer into two-port Norton circuits. The EM shows good performances in the aspects of efficiency, accuracy and scalability.…”

Section: Introductionmentioning

confidence: 99%

“…A portion of this method has been presented in [26], which is significantly improved in this paper. In addition, the equivalent modelling method of the blocking mode can be effectively solved by calling the sub-function of the diode model from the EMT solver [24], which is out of the scope of this paper.…”

mentioning

confidence: 99%

See 3 more Smart Citations

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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mentioning

confidence: 70%

Section: The Proposed Accelerated Modelling Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…To accelerate the EMT simulation, the detailed equivalent model (DEM) based on binary resistors was developed in [12] where individual SMs on one arm are assembled. The DEM is still inefficient in terms of computational speed for representing an MMC with a large number of SMs due to the time-varying equivalence [13]. The averaged-value models (AVMs) were addressed to track fundamental frequency dynamics [14], [15], but they neglect the switching transients of individual SMs.…”

Section: Introductionmentioning

confidence: 99%

Wave Function and Multiscale Modeling of MMC-HVdc System for Wide-Frequency Transient Simulation

Gao

Pei

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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The detailed modeling of power electronic (PE) devices poses challenging problems to efficient transient simulation of large-scale PE-dominated power systems. As PE paradigm, a multi-scale modeling methodology of the modular multilevel converter (MMC) for simulating diverse transients from lowfrequency oscillations up to high-frequency switching events in an MMC high-voltage direct current (HVDC) system is developed, implemented and validated. The novelty lies in a creation of wave propagation function (WPF) that describes the MMC submodule (SM) transient behavior, and then the SM Fourier seriesbased shifted-frequency phasor (SFP) is developed to accelerate computation speed of the system-level dynamics. These efforts serve as the basis for multi-scale modeling of the MMC where a multiple-frequency shifting is achieved. By implementing seamless model interface with the control systems, the multi-scale modeling is applicable to an MMC-HVDC transmission system. The multi-scale model is validated through case studies that cover dc fault, MMC internal fault, power oscillations and wind power fluctuations. The computational accuracy and efficiency of the model is verified through comparison of the results with those from the full electromagnetic transient (EMT) model.

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Research on Multi-Port Power Electronic Transformer for Intelligent Home Electric Distribution System

Fan

You-min

Xiangbin

2023

J. Electr. Eng. Technol.

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High-Speed Electromagnetic Transient (EMT) Equivalent Modelling of Power Electronic Transformers

Cited by 29 publications

References 24 publications

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

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

Wave Function and Multiscale Modeling of MMC-HVdc System for Wide-Frequency Transient Simulation

Research on Multi-Port Power Electronic Transformer for Intelligent Home Electric Distribution System

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