Imperial College London

DrYunjieGu

Faculty of EngineeringDepartment of Electrical and Electronic Engineering

Research Associate
 
 
 
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Contact

 

yunjie.gu

 
 
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Location

 

1105Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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34 results found

Gu Y, Li Y, Yoo H-J, Nguyen T-T, Xiang X, Kim H-M, Junyent-Ferre A, Green Tet al., 2019, Transfverter: imbuing transformer-like properties in an interlink converter for robust control of a hybrid ac-dc microgrid

Matlab/Simulink models and codes for getting the results in the paper with the same title on IEEE Transactions on Power Electronics, DOI: 10.1109/TPEL.2019.2897460

Software

Gu Y, Li Y, Yoo H-J, Nguyen T-T, Xiang X, Kim H-M, Junyent Ferre A, Green Tet al., Transfverter: imbuing transformer-like properties in an interlink converter for robust control of a hybrid ac-dc microgrid, IEEE Transactions on Power Electronics, ISSN: 0885-8993

In a hybrid ac-dc microgrid, stiff voltage sources may appear in either the dc or ac subgrids which gives rise to multiple operation modes as power dispatch changes. This creates a challenge for designing the interlink converter between the ac and dc subgrids since the different modes require different interlink controls. To solve this problem, this paper proposes the concept of a transfverter inspired by how transformers link ac grids. Like a transformer, a transfverter can react to the presence of stiff voltage sources on either the dc or ac side and reflect the “stiffness” and voltage stabilizing capability to the other side. A back-to-back converter with droop control is used as the underlying technology to implement this concept. A novel optimization method called model bank synthesis is proposed to find control parameters for the interlink converter that offer the best controller performance across the different microgrid modes without requiring mode-changing of the controller. The effectiveness of the proposed solution is validated through both simulation and experiments.

Journal article

Xiang X, Zhang X, Chaffey G, Gu Y, Sang Y, Green Tet al., Analysis on circulating current frequency of chain-link modular multilevel DC-DC converters for low step-ratio high-power MVDC applications, IEEE ECCE 2018, Publisher: IEEE

The direct chain-link modular multilevel dc converter has raised great interest recently in medium/high- voltage dc-dc conversion due to the high power device utilization and lower power losses than the front-to-front configurations of modular multilevel converter. This paper introduces a single-phase chain-link modular multilevel buck-boost converter for medium voltage dc applications and presents an analysis methodology on its internal circulating current frequency. Its connection and comparison with the classic dc-ac modular multilevel converter are given first, and its dc and ac components are analyzed in the respective equivalent circuits. Then, the derivation methodology for the proper circulating current frequency with lowest internal reactive power is provided, which could minimize the current stress and decrease the power losses. Also, this method can be directly applied in the derivative topologies and further configurations to satisfy various conversion requirements. The theoretical analysis is verified by a set of full-scaled simulations and further verified against experimental tests on a down-scaled prototype.

Conference paper

Gu Y, Bottrell N, Green TC, 2018, Reduced-order models for representing converters in power system studies, IEEE Transactions on Power Electronics, Vol: 33, Pages: 3644-3654

Journal article

Xiang X, Zhang X, Chaffey GP, Gu Y, Green TCet al., 2017, The isolated resonant modular multilevel converters with large step-ratio for MVDC applications, 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), Publisher: Institute of Electrical and Electronics Engineers, Pages: 1-6

The dc-dc conversion will play an important role in multi-terminal dc networks and dc grids. This paper presents two isolated resonant modular multilevel converters (IRMMCs) to fulfill the large step-ratio conversion for medium voltage dc (MVDC) networks. The conventional resonant modular multilevel converters (RMMCs) suffer the common problems of non-isolation and high current stress, which are solved in the proposed IRMMCs. They not only inherit the beneficial features of inherent sub-module (SM) voltage-balancing and soft-switching operation from RMMCs, but also develop multi-module configurations to neutralize the current ripples on both sides of the dc-links. The theoretical analysis is verified by a set of full-scaled simulations for different application examples in MVDC collection and distribution. The results demonstrate the proposed IRMMCs and its derived configurations have good potential for operation as large step-ratio MVDC transformers.

Conference paper

Gu Y, Bottrell, Green, 2017, Reduced-Order Models for Representing Converters in Power System Studies

Matlab codes of reduced-order models for representing power electronic converters in power system analyses.

Software

Xiang X, Zhang X, Chaffey G, Gu Y, Green Tet al., 2017, The isolated resonant modular multilevel converters with extreme step-ratio for MVDC application, 2017 IEEE 18TH WORKSHOP ON CONTROL AND MODELING FOR POWER ELECTRONICS (COMPEL), Publisher: IEEE

Conference paper

Li W, Wang J, Yang H, GU Y, YANG H, HE Xet al., 2017, Power Dynamic Coupling Mechanism and Resonance Suppression of Synchronous Frequency for Virtual Synchronous Generators, Proceedings of the CSEE, Vol: 2, Pages: 006-006

Journal article

Gu Y, Li W, He X, 2016, Analysis and control of bipolar LVDC grid with DC symmetrical component method, IEEE transactions on power systems, Vol: 31, Pages: 685-694

Journal article

WANG J, WANG Y, GU Y, LI W, HE Xet al., 2016, Synchronous Frequency Resonance in Grid-connected VSCs with Virtual Synchronous Generator Technology, Journal of Power Supply, Vol: 2, Pages: 004-004

Journal article

Gu Y, Li W, He X, 2015, Passivity-based control of DC microgrid for self-disciplined stabilization, IEEE Transactions on Power Systems, Vol: 30, Pages: 2623-2632

Journal article

Li W, Gu Y, Luo H, Cui W, He X, Xia Cet al., 2015, Topology review and derivation methodology of single-phase transformerless photovoltaic inverters for leakage current suppression, IEEE Transactions on Industrial Electronics, Vol: 62, Pages: 4537-4551

Journal article

Gu Y, Li W, He X, 2015, Frequency-coordinating virtual impedance for autonomous power management of DC microgrid, IEEE Transactions on Power Electronics, Vol: 30, Pages: 2328-2337

Journal article

Wuhua LI, Chi XU, Hongbin YU, Yunjie GU, Xiangning HEet al., 2015, Energy management with dual droop plus frequency dividing coordinated control strategy for electric vehicle applications, Journal of Modern Power Systems and Clean Energy, Vol: 3, Pages: 212-220

Journal article

Wang J, Wang Y, Gu Y, Li W, He Xet al., 2015, Synchronous frequency resonance of virtual synchronous generators and damping control, Pages: 1011-1016

Conference paper

Wang Y, Gu Y, Li W, He Xet al., 2015, Analysis of pre-compensator for disturbance signal elimination in single-phase inverters with virtual vector control, Pages: 157-162

Conference paper

LI W, GU Y, WANG Y, XIANG X, HE Xet al., 2015, Control architecture and hierarchy division for renewable energy DC micro grids, Automation of Electric Power Systems, Vol: 39, Pages: 156-163

Journal article

Gu Y, Zheng W, Li W, He Xet al., 2015, Self-disciplined stabilization of DC microgrids by passivity-based control, Pages: 1838-1844

Conference paper

LUO Q, YANG H, GU Y, LI W, HE Xet al., 2015, Hybrid LLC Converter With Input Voltage Auto-balance Ability, Proceedings of the CSEE, Vol: 2, Pages: 026-026

Journal article

Gu Y, Chi Y, Li Y, Sun W, Li W, He Xet al., 2015, DC symmetrical component method for analysis and control of bipolar LVDC grid, Pages: 2802-2807

Conference paper

Li C, Gu Y, Li W, He X, Dong Z, Chen G, Ma C, Zhang Let al., 2015, Analysis and compensation of dead-time effect considering parasitic capacitance and ripple current, Pages: 1501-1506

Conference paper

Cui W, Luo H, Gu Y, Li W, Yang B, He Xet al., 2015, Hybrid-bridge transformerless photovoltaic grid-connected inverter, IET Power Electronics, Vol: 8, Pages: 439-446

Journal article

Gu Y, Xiang X, Li W, He Xet al., 2014, Mode-adaptive decentralized control for renewable DC microgrid with enhanced reliability and flexibility, IEEE Transactions on power electronics, Vol: 29, Pages: 5072-5080

Journal article

Xu C, Yu H, Gu Y, Sun P, Li W, He X, Cao Fet al., 2014, Duty cycle-based start-up control for a ZVS bidirectional DC-DC converter, Pages: 3046-3050

Conference paper

Gu Y, Wang Y, Xiang X, Li W, He Xet al., 2014, Improved virtual vector control of single-phase inverter based on unified model, IEEE Transactions on Energy Conversion, Vol: 29, Pages: 611-618

Journal article

Ali A, Gu Y, Xu C, Li W, He Xet al., 2014, Comparing the performance of different control techniques for DC-DC boost converter with variable solar PV generation in DC microgrid, Pages: 603-609

Conference paper

Zhao Y, Xiang X, Li C, Gu Y, Li W, He Xet al., 2014, Single-phase high step-up converter with improved multiplier cell suitable for half-bridge-based PV inverter system, IEEE Transactions on Power Electronics, Vol: 29, Pages: 2807-2816

Journal article

Li W, Xu C, Yu H, Gu Y, He Xet al., 2014, Analysis, design and implementation of isolated bidirectional converter with winding-cross-coupled inductors for high step-up and high step-down conversion system, IET Power Electronics, Vol: 7, Pages: 67-77

Journal article

Gu Y, Li W, Zhao Y, Yang B, Li C, He Xet al., 2013, Transformerless inverter with virtual DC bus concept for cost-effective grid-connected PV power systems, IEEE Transactions on Power Electronics, Vol: 28, Pages: 793-805

Journal article

Huifen L, Yunjie G, Hongibin Y, Wuhua Let al., 2013, RESEARCH OF SIMULATION SYSTEM OF PV ON-GRID POWER GENERATION BASED ON DSP, Acta Energiae Solaris Sinica, Vol: 8, Pages: 006-006

Journal article

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