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This paper shares the design of a high-efficiency single-stage series resonant micro inverter used for domestic photovoltaic (PV) systems. The First Harmonic Analysis (FHA) model of the system is first established. An analytical modulation scheme of small root-mean-square resonant current, reliable full-range Zero Voltage Switching (ZVS), and small switching frequency variation range is proposed. ...Show More
Analysis of Phase Shielding Method Based on Delta-Cr-Y Three- Phase Interleaved LLC Converter
Jin Wen;Jiajia Guan;Zongheng Wu;Wenzhe Xu;Cai Chen;Yong Kang
Based on the Delta-Cr-Y three-phase interleaved LLC converter, a series of possible phase shielding methods are proposed, and one of them is analyzed in detail. After the phase shielding operation, the resonant frequency of the converter does not change, which means smooth switching in the field of DC transformers. After loss analysis and comparison, the efficiency can still be improved at light l...Show More
Design and Integration Methodology of CM Stripline Inductors and EMI Filters in SiC Power Modules for Low Conductive CM EMI
2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia)
Year: 2024 | Conference Paper |
Silicon carbide (SiC) devices have become increasingly popular in power electronics. The fast-switching performance of WBG devices enables the converter with high power density. But these characteristics also bring serious electromagnetic interference (EMI) issues. Integrating the EMI filer can effectively reduce the EMI generated by the power module. Therefore, this article presents a 650V/39A ha...Show More
Design and Integration Methodology of CM Stripline Inductors and EMI Filters in SiC Power Modules for Low Conductive CM EMI
Year: 2024 | Conference Paper |
Research on Vibration and Acoustic Noise Emission of Nanocrystalline Inductors Based on Multi-physics Coupling Analysis
Mengyao Du;Baihan Liu;JiaJia Guan;Wenzhe Xu;ShuangXi Zhu;Cai Chen;Jiaxin Liu;Yong Kang;Min Wang;Chenjiang Yu
2024 IEEE Applied Power Electronics Conference and Exposition (APEC)
Year: 2024 | Conference Paper |
Inductors are the most widely used components in power converters, and their vibration and acoustic noise are problems that cannot be ignored for the system's stable operation. To figure out the vibration and noise performance of nanocrystalline inductors, the coupled finite element model of the electromagnetic-mechanical field is established and the effects of Maxwell force and magnetostriction o...Show More
DC Fault Characteristics Analysis of Full DC Offshore Wind Farm
Zhenhua Lv;Huachun Han;Wenzhe Xu;Peng Liang;Zheren Zhang;Zheng Xu
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2023 | Conference Paper |
Offshore wind power is the key to achieve carbon neutrality goal, and full DC scheme is a competitive choice for offshore wind farm integration. However, there are little researches focus on the DC fault characteristics of the full DC scheme. This paper firstly develops the equivalent converter model for fault characteristics analysis. Then the equivalent model of full DC offshore wind farm is der...Show More
A New Driving Compensation Strategy to Improve Current Symmetry of Integrated Buck-Boost-LLC Converter
Jin Wen;Jiajia Guan;Zongheng Wu;Wenzhe Xu;Yue Wu;Zhipeng He;Cai Chen;Yong Kang
2023 IEEE 4th China International Youth Conference On Electrical Engineering (CIYCEE)
Year: 2023 | Conference Paper |
The inherent characteristics of the integrated Buck-Boost-LLC converter lead to the asymmetry of its resonant tank voltage, which further leads to the asymmetry of the resonant current as well as the demagnetization of the transformer, which seriously affects the operation of the converter. In this paper, a drive compensation strategy is proposed to suppress the asymmetry of voltage and current. B...Show More
Research on Electromagnetic Transient Simulation of 500kV Unified Power Flow Controller
Xinyue Zhu;Bo Yu;Yan Fan;Xiaofei Ding;Yi Xing;Qianxiu Feng;Rongzhen Qi;Zhuoyuan Cai;Wenzhe Xu;Zheng Xu
2023 IEEE 6th Student Conference on Electric Machines and Systems (SCEMS)
Year: 2023 | Conference Paper |
As the most versatile flexible AC transmission system to date, the unified power flow controller(UPFC) not only controls the AC line power flow, but also provides reactive power compensation to the system. At present, UPFC has been developed to 500 kV voltage level, and the converters’ structure is modular multilevel converter(MMC). The special structure of UPFC’s series side transformer makes the...Show More
Design of a High Efficiency and High Power-Density GaN-Based Microinverter
Wenzhe Xu;Shuangxi Zhu;Zhiyi Hu;Teng Liu;Mengyao Du;Jin Wen;Cai Chen;Yong Kang;Haiyan Chen;Zhaosheng Jin;Lei Yang
2023 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2023 | Conference Paper |
Gallium-Nitride (GaN)-based microinverters play a crucial role in the next generation of highly integrated distributed photovoltaic (PV) systems. The objective of this paper is to propose an effective and practical design process for a 400W natural-cooled GaN-based microinverter with both high efficiency and high power-density. Independent optimizing parameters are proposed, and loss models of key...Show More
An Iterative-Based Dead-Time Compensation Method for Integrated Interleaved Boost-LLC Converter
Jin Wen;Jiajia Guan;Zongheng Wu;Wenzhe Xu;Haiyan Chen;Zhaosheng Jin;Lei Yang;Cai Chen;Kang Yong
2023 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2023 | Conference Paper |
Cited by: Papers (2)
This paper proposes an iterative-based dead-time compensation method to help integrated interleaved boost-LLC converter (IIBLLC) converter achieve higher frequency. By adjusting switching frequency and compensating dead time, the converter can operate in quasi-resonant mode and the rectification control signal is synchronized with the primary side. In quasi-resonant mode, smaller current RMS resul...Show More
Fault Isolation Control Method of DC Series-Parallel Offshore Wind Farm
2023 International Conference on Power System Technology (PowerCon)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
Wind farms using DC aggregation and DC transmission mode are an effective solution for the development of offshore wind power in the direction of located in the deep sea and large-scale. However, after the failure of the full DC wind farm, the fault spread speed is very fast, and the impact is wide, there is still no realistic project to refer to. It is necessary to study the fault isolation contr...Show More
A High Efficiency Δ-Lr-Y Type Three-Phase Interleaved LLC Converter With Less Transformer Loss
Jiajia Guan;Zongheng Wu;Teng Liu;Jin Wen;Wenzhe Xu;Cai Chen;Yong Kang
Y-type three-phase interleaved LLC has advantages in high-power applications with small output current ripple. However, the traditional Y-type three-phase interleaved LLC has large winding current under low output voltage and high-power applications, which affects the efficiency and power density. In this article, a high-efficiency delta-type three-phase interleaved LLC topology with less transfor...Show More
Analysis of Dead-Time Energy Loss in GaN-Based TCM Converters With an Improved GaN HEMT Model
Yi Zhang;Wenzhe Xu;Yue Xie;Teng Liu;Zongheng Wu;Cai Chen;Yong Kang;Han Peng
For gallium nitride (GaN) based triangular current mode (TCM) applications, the dead-time has a significant effect on the switching loss. However, previous GaN high electron mobility transistor (HEMT) models focus on the turn-on/off process without fully considering the effect of the dead-time. Hence, this article analyzes the switching transients under the superfluous and insufficient dead-time a...Show More
High Efficiency and High Power Density Partial Power Regulation Topology With Wide Input Range
Zongheng Wu;Zhiwei Wang;Teng Liu;Wenzhe Xu;Cai Chen;Yong Kang
Data centers require high efficiency and high power-density dc–dc converter with wide input range and galvanic isolation. To overcome the drawbacks of traditional single-stage LLC and two-stage solutions, a novel partial power regulation topology with wide input range is proposed in this article. The proposed topology delivers the load power through a three-ports LLC-based dc transformer regulated...Show More
A Space Vector Based Diagnosis Method for Switch Open-Circuit Fault in Vienna Rectifier
2022 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2022 | Conference Paper |
Cited by: Papers (3)
In this paper, a space vector based diagnosis method for switch open-circuit fault (SOCF) in Vienna rectifier is proposed by analyzing the characteristics of different fault states. With the proposed diagnosis method, an SOCF can be detected and identified fast and precisely during all the period of operation time, and this will bring considerable benefits in terms of avoiding the occurrence of ov...Show More
A High Efficiency and High Power Density DC Transformer Topology With Output Regulation Capability
Zongheng Wu;Zhiwei Wang;Yi Zhang;Wenzhe Xu;Cai Chen;Yong Kang
LLC based dc transformer (DCX) with fixed voltage ratio is a suitable candidate for telecommunication equipment and data center for its high efficiency. Traditionally, a pulsewidth modulation (PWM) regulator are employed to achieve voltage regulation capability. However, the two-stage structure makes sacrifice in efficiency. Hence, this article proposes a novel partial regulated DCX with fixed swi...Show More
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