Shaoyong Chen

Beijing Jiaotong University

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Co-Authors

Yu Ai

Shaanxi Yulin Energy Group

Jianqiang Liu

Ningxia University

Yunming Shi

Beijing Jiaotong University

Chunxing Pei

Beijing Jiaotong University

Zehui Zhang

Fuzhou University

Tengfei Guo

Shenzhen Bay Laboratory

Jiangqiang Liu

Beijing Jiaotong University

Yi Zhuang

Nanjing University of Aeronautics and Astronautics

Jianquan Chen

Soochow University

Fan Wu

Southeast University

Cooperative Institutions

Beijing Jiaotong University

University of Electronic Science and Technology of China

Ministry of Industry and Information Technology

Tongji University

Fujian Medical University

Southwest Petroleum University

Northwestern Polytechnical University

Beihang University

Shenzhen Bay Laboratory

Peking University

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Dynamic IGBT Three-Dimensional Thermal Network Model Considering Base Solder Degradation and Thermal Coupling Between IGBT Chips

IEEE Transactions on Transportation Electrification (2022)

Yunming Shi Jianqiang Liu Yu Ai Shaoyong Chen Yu Bai

With the development of power electronic technology, the thermal characteristics of high-power insulated-gate bipolar transistor (IGBT) module are vital information for thermal management of power electronic equipment, reliability analysis, and thermal design of power electronic system. However, the present commonly used lumped thermal network model based on thermal resistance and heat capacity still has some limitations in accurately predicting the junction temperature of IGBT modules, significantly once considering the degradation of base solder in high-power IGBT modules. In this article, the thermal behavior of high-power IGBT chips under different base solder degradation is studied by the finite-element method (FEM). The results show that the degradation of the base solder has effects on the thermal impedance between the junction and the case, which should be fastidiously thought about within the thermal network model modeling. As a result, a dynamic 3-D thermal network model that considers the thermal interaction between IGBT chips, as well as the degradation of the base solder, is proposed in this article. The proposed thermal network model can estimate the junction temperature of a high-power IGBT module correctly and fast based on the real degradation of the base solder. Finally, finite-element simulation and experimental findings are used to validate the proposed dynamic 3-D thermal network model. The results show that the dynamic 3-D thermal network model has comparable accuracy to finite-element simulation and test results. At the same time, the dynamic 3-D thermal network model responds faster than the finite-element simulation.

Insulated-gate bipolar transistor

Power module

Thermal grease

10.1109/tte.2022.3228440

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Citations (16)

Research on the Design Method of Nanocrystalline High-Frequency Transformer

Fan Wu Tengfei Guo Yu Ai Shaoyong Chen Jiangqiang Liu

Nanocrystalline material

10.1109/hvdc62448.2024.10722890

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Citations (0)

An Improved DC Power Electronic Transformer Based on Voltage Balancing Converter for Bipolar Distribution System

IEEE Transactions on Industrial Electronics (2023)

Yu Ai Jianqiang Liu Shaoyong Chen Yunming Shi Chunxing Pei

This article proposes a bipolar dc power electronic transformer (DCPET) with monopole fault operation capability for medium-voltage/low-voltage dc (LVdc) distributions. Compared with the conventional bipolar LVdc topology, the proposed DCPET considers the reduced number of switching devices and the normal operation under monopole faults, which improves power supply reliability. The dc fault ride-through (FRT) strategy is further proposed in this article to increase the power supply reliability under LVdc short-circuit faults. To reduce the short-circuit current and maintain the LVdc voltage, the switching device reversely series with the capacitor is blocked after the fault. Thus, the fault current is restricted, and power supply recovery time after fault clearance is reduced. Moreover, the LLC resonant converter adopting phase-shift control outputs stable fault criterion current to assist the protection system in locating the fault location and fault removal. Finally, a downscaled prototype is built to verify the proposed topology and FRT strategy through experiments.

Power Electronics

10.1109/tie.2023.3239939

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Citations (5)

Post-evaluation Model for 500kV Substation Engineering Projects Using the Fuzzy Comprehensive Evaluation Method

Heliyon (2025)

Jianquan Chen Yi Zhuang Shaoyong Chen Zhongtian Zhang Yu Zhang

10.1016/j.heliyon.2025.e42327

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Citations (0)

Lifetime Prediction Method of the Traction Converter IGBT Based on Plastic Strain Energy Density

IEEE Transactions on Transportation Electrification (2023)

Yunming Shi Jianqiang Liu Yu Ai Shaoyong Chen Chunxing Pei

Insulated gate bipolar transistor (IGBT) is the most important power electronic component in the traction converters of trains. During the operation of the IGBT, the solder layer is continuously subjected to alternating stress, which eventually leads to the fatigue failure of the solder layer. Therefore, an accurate assessment of the lifetime of the IGBT module solder layer is of great importance for the safe and reliable operation of the trains. First, the micromechanism of the plastic deformation of the base solder layer of the IGBT module is introduced, as well as the lifetime model based on the plastic strain energy density. Then, the total plastic strain energy density of the base solder layer is determined by conducting the accelerated aging tests on the IGBT module and combining the finite element simulation results. Meanwhile, the relationship between different aging degrees of the base solder layer of the IGBT module and the plastic strain energy density is studied by finite element simulation. Then, the lifetime of the base solder layer at different aging stages is calculated based on the above results, so that the total lifetime of the IGBT module is obtained. Finally, the predicted lifetime of the IGBT module by the proposed method is compared with the lifetime obtained by the accelerated aging test and compared with the traditional lifetime prediction method based on the Coffin–Manson–Arrhenius model. The comparison results verify the accuracy of the proposed lifetime prediction method in this article.

Insulated-gate bipolar transistor

Energy density

Strain (injury)

10.1109/tte.2023.3274567

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Citations (5)

A Novel Online Inductance Identification of Traction Network and Adaptive Control Method for Cascaded H-Bridge Converter

IEEE Transactions on Power Electronics (2021)

Shaoyong Chen Yu Ai Yunming Shi Shuai Zhao Jianqiang Liu

The grid-tied cascaded H-bridge (CHB) converter may become unstable, especially for the traction onboard application where the grid impedance may gradually vary as the train moves. In order to overcome this weakness, a small-signal stability-based adaptive control strategy is proposed in this article, where the parameter of the current-inner-loop controller is adaptively regulated according to the online grid inductance identification (GII) result. In the proposed control structure, there is only one control parameter needed to be regulated online, which is based on the estimated value of the grid inductance. In this article, the grid inductance is estimated by injecting the specific harmonic current. With the corresponding harmonic current regulator, stable and sustained harmonic current can be injected, which is beneficial to mitigate the fierce fluctuation of the GII result. The GII algorithm is made up of three parts, including the analog low-pass filter, the sliding discrete Fourier transform, and the digital composite filter, which can suppress the switching noise, the low-frequency grid harmonics, and the grid frequency deviation. With the proposed adaptive control strategy, the CHB can ensure small-signal stability wherever it is connected. All these theoretical analyses are verified by the experiment.

Harmonic

Harmonic Analysis

10.1109/tpel.2021.3137586

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Citations (4)

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

Energies (2022)

Yu Ai Yunming Shi Shaoyong Chen Zehui Zhang Shuai Zhao

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.

Leakage inductance

Low-dropout regulator

10.3390/en15062106

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Citations (4)

A Hybrid Pulse Frequency Modulation Control Strategy for L-LLC Resonant Converter

IEEE Journal of Emerging and Selected Topics in Power Electronics (2022)

Jianqiang Liu Yu Ai Shaoyong Chen Zehui Zhang Yunming Shi

The traditional control strategy for the L-LLC resonant converter is the synchronous unequal width pulse frequency modulation (SUW PFM). However, this strategy causes a large circulating power in the forward buck and reverse boost modes, especially when the voltage gain deviates from 1. To solve the limitations of the SUW PFM, a novel constant width PFM (CW PFM) is proposed in this article, which can reduce the circulating power and improve the converter efficiency in the forward buck and reverse boost modes. Furthermore, a hybrid PFM control strategy is proposed by merging the appropriate working conditions of the CW PFM and the SUW PFM, which can flexibly switch the two modulations depending on the gain and load conditions. Therefore, the L-LLC resonant converter has good soft-switching characteristics in entire load and gain ranges. Finally, a 7.5-kW L-LLC resonant converter prototype is built to verify the validity and superiority of the proposed control strategy.

Pulse-frequency modulation

Resonant converter

Modulation (music)

Buck converter

10.1109/jestpe.2022.3180216

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Citations (4)

A small-signal modeling method for LLC resonant converter based on time-domain correction

IEEE Transactions on Power Electronics (2024)

Yu Ai Jianqiang Liu Shaoyong Chen Chunxing Pei

LLC resonant converters possess excellent soft-switching characteristics and are extensively applied in the DC-DC converter field. To achieve closed-loop control of the LLC resonant converter, it is crucial to establish an accurate small-signal model. Traditional modeling methods suffer from the problems of decreasing accuracy away from the resonant frequency or high model complexity in practical applications. This paper proposes a small-signal modeling method for LLC resonant converter based on time-domain correction, which provides practical analytical small-signal models below, at, and above the resonant frequency. The proposed method strikes a balance between accuracy and complexity. Equivalent models of components and the average equivalent circuit of the LLC converter are established using simplified time-domain analysis to describe the average characteristics of the LLC converter. Small-signal perturbations are applied to the average equivalent circuit to derive an analytical second-order average small-signal model that can guide closed-loop regulator design and stability analysis of the LLC converter. Finally, the correctness of the proposed small-signal modeling method is verified through PLECS AC sweep simulations and experiments.

Resonant converter

SIGNAL (programming language)

Small-signal model

10.1109/tpel.2024.3404035

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Citations (2)