Modeling and Control of Three-Level Boost Rectifier Based Medium-Voltage Solid-State Transformer for DC Fast Charger Application

Lee, Moonhyun; Yeh, Chih-Shen; Yu, Oscar; Kim, Jong-Woo; Choe, Jung-Muk; Lai, Jih‐Sheng

doi:10.1109/tte.2019.2919200

Cited by 47 publications

(8 citation statements)

References 42 publications

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“…Another modular SST implementation [94] is given in Figure 8. This configuration uses an ac/dc front end three-level boost (TLB) circuit and half-bridge LLC converter in dc/dc stage with 1.2 kV SiC devices.…”

Section: Sst-based Xfc Stations Converter Designs and Their Controlmentioning

confidence: 99%

“…At 16 kW, the efficiency of the system is >98%. A digital control system is designed and proposed in [94] for this TLB-SST design. The control system's entire structure comprises four parts that include a phase-locked loop (PLL), PWM generators, feedback control, and ideal duty-ratio feed-forward loop.…”

Section: Sst-based Xfc Stations Converter Designs and Their Controlmentioning

confidence: 99%

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A state‐of‐the‐art review on topologies and control techniques of solid‐state transformers for electric vehicle extreme fast charging

Tahir

Khan

Rahman

et al. 2021

IET Power Electronics

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Electrical vehicle (EV) technology has gained popularity due to its higher efficiency, less maintenance, and lower dependence on fossil fuels. However, a longer charging time is a significant barrier to its complete adaptation. Solid state transformer (SST) based extreme fast charging schemes have emerged as an appealing idea with an ability to provide a refuelling capability analogous to that of gasoline vehicles. Therefore, this paper reviews the EV charger requirements, specifications, and design criteria for high power applications. At first, the key barriers of using a traditional low frequency transformer (LFT) are discussed, and potential solutions are suggested by replacing the conventional LFT with high frequency SST at extreme fast-charging (XFC) stations. Then, various SST-based converter topologies and their control for EV fast-charging stations are described. The reviewed control strategies are compared while considering several factors such as harmonics, voltage drop under varying loading conditions, dc offset load unbalances, overloads, and protection against system disturbances. Furthermore, the realization of SST for EV charging is comprehensively discussed, which facilitates understanding the current challenges, based on which potential solutions are also suggested.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Sst-based Xfc Stations Converter Designs and Their Controlmentioning

confidence: 99%

Section: Sst-based Xfc Stations Converter Designs and Their Controlmentioning

confidence: 99%

A state‐of‐the‐art review on topologies and control techniques of solid‐state transformers for electric vehicle extreme fast charging

Tahir

Khan

Rahman

et al. 2021

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…Then, Figure 9 shows the Bode diagram of the system with the PI parameter. During the charging and discharging process, for the purpose of improving the dynamic response of the converter and to reduce the effect of the output voltage and input voltage disturbance, the duty ratio feedforward control method is put forward [32].…”

Section: Controller Design Of Bidirectional Dc-dc Convertermentioning

confidence: 99%

“…From this equation, it can be obtained that the duty cycle of the converter only depends on the input voltage and output voltage and it has nothing to do with the current in a steady state. Therefore, by controlling the duty ratio of the converter in this equation, the disturbance of input voltage and output voltage will be rejected [32]. Different from feedback control, by introducing a feedforward control strategy, the dynamic performance of the charging and discharging current will be also improved.…”

Section: Controller Design Of Bidirectional Dc-dc Convertermentioning

confidence: 99%

“…and thus will be help to improve the dynamic performance of the current. So, in order to achieve fast current tracking, the duty ratio feedforward control method is adopted and the actual duty ratio of the control system is illustrated as: During the charging and discharging process, for the purpose of improving the dynamic response of the converter and to reduce the effect of the output voltage and input voltage disturbance, the duty ratio feedforward control method is put forward [32].…”

Section: Controller Design Of Bidirectional Dc-dc Convertermentioning

confidence: 99%

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Dynamic Improvement with a Feedforward Control Strategy of Bidirectional DC-DC Converter for Battery Charging and Discharging

Han

Yang

et al. 2020

Electronics

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With the increasing importance of power accumulator batteries in electric vehicles, the accurate characteristics of power accumulator batteries have an important role. In order to evaluate the power accumulator battery, battery charging and discharging is indispensable. In this article, a H-bridge bidirectional DC-DC converter is presented which can charge and discharge the battery with different voltage levels and one of the merits of this topology is that a wide output voltage range can be easily achieved. In the control part, a proportional-integral (PI) control strategy is adopted to ensure a stable and reliable operation of the converter. Furthermore, compared with the PI control strategy, a duty ratio feedforward control is utilized to obtain the rapid current dynamic response. In this article, firstly, the system configuration for battery charging and discharging is introduced, then the operating principles and mathematical model of the DC-DC converter are analyzed and derived. Secondly, for bidirectional DC-DC converters, the PI control method and duty ratio feedforward control method are put forward and designed. Finally, the simulation model is established based on PSIM software and the experiment platform is also built in lab. The results of the simulation and experiment research show that the H-bridge bidirectional DC-DC converter can operate reliably and stably during the charging, discharging and power flow reverse modes. In addition, the dynamic response of the charging and discharging current can also be further improved by introducing the duty ratio feedforward control method.

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DC‐link voltage stability analysis for three‐level boost + full‐bridge LLC cascaded converter using impedance modeling

Ma,

He,

Xie

et al. 2024

Circuit Theory & Apps

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The cascade converter system has been widely concerned along with the medium power operating conditions, and it is crucial to address the intricate interplay among individual modules to ensure stability of both the source and load subsystems. This paper analyzes the DC‐link voltage stability based on impedance matching and proposes a normalized sensitivity calculation method based on the control strategy, which prevents the complex products and matrix calculations of traditional methods. The three‐level boost (TLB) output impedance model is derived based on state‐space averaging for open‐loop and considering the double‐loop, and the full‐bridge LLC (FBLLC) input impedance model is derived based on the fundamental equivalent circuit. Then the effect of the double‐loop PI parameters on the output impedance of the TLB is analyzed in detail based on the normalized sensitivity and verified by the Bode plots. The experimental results of the 30 kW prototype indicate that the control parameters were varied by a factor of 10 compared to the theoretical control group. The most significant alteration was the modification of the kp_i, resulting in an 8.9% increase in the DC‐link voltage ripple, while the ki_v was modified, resulting in a 0.53% increase, indicating that the effects of the PI parameter are consistent with the normalized sensitivity results.

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Modeling and Control of Three-Level Boost Rectifier Based Medium-Voltage Solid-State Transformer for DC Fast Charger Application

Cited by 47 publications

References 42 publications

A state‐of‐the‐art review on topologies and control techniques of solid‐state transformers for electric vehicle extreme fast charging

A state‐of‐the‐art review on topologies and control techniques of solid‐state transformers for electric vehicle extreme fast charging

Dynamic Improvement with a Feedforward Control Strategy of Bidirectional DC-DC Converter for Battery Charging and Discharging

DC‐link voltage stability analysis for three‐level boost + full‐bridge LLC cascaded converter using impedance modeling

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