Publications
53 results found
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, ISSN: 0885-8950
DC microgrids may have time-varying system structures and operation patterns due to the flexibility and uncertainty of distributed resources. This feature poses a challenge to conventional stability analysis methods, which are based on fixed and complete system models. To solve this problem, the concept of self-disciplined stabilization is introduced in this paper. A common stability discipline is established using the passivity-based control theory, which ensures that a microgrid is always stable as long as this discipline is complied by each individual converter. In this way, the stabilization task is localized to avoid investigating the entire microgrid, thereby providing immunity against system variations. Moreover, a passivity margin criterion is proposed to further enhance the stability margin of the self-disciplined control. The modified criterion imposes a tighter phase restriction to provide explicit phase margins and prevent under-damped transient oscillations. In line with this criterion, a practical control algorithm is also derived, which increases the converter's passivity through voltage feed forward. The major theoretical conclusions are verified by a laboratory DC microgrid test bench.
Li W, Gu Y, Luo H, et 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, ISSN: 0278-0046
Single-phase voltage source transformerless inverters have been developed for many years and have been successful commercial applications in the distributed photovoltaic (PV) grid-connected systems. Moreover, many advanced industrial topologies and recent innovations have been published in the last few years. The objective of this paper is to classify and review these recent contributions to establish the present state of the art and trends of the transformerless inverters. This can provide a comprehensive and insightful overview of this technology. First, the generation mechanism of leakage current is investigated to divide the transformerless inverters into asymmetrical inductor-based and symmetrical inductor-based groups. Then, the concepts of dc-based and ac-based decoupling networks are proposed to not only cover the published symmetrical inductor-based topologies but also offer an innovative strategy to derive advanced inverters. Furthermore, the transformation principle between the dc-based and ac-based topologies is explored to make a clear picture on the general law and framework for the recent advances and future trend in this area. Finally, a family of clamped highly efficient and reliable inverter concept transformerless inverters is derived and tested to offer some excellent candidates for next-generation high-efficiency and cost-effective PV grid-tie inverters.
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, ISSN: 0885-8993
In this paper, the concept of frequency-coordinating virtual impedance is proposed for the autonomous control of a dc microgrid. This concept introduces another degree of freedom in the conventional droop control scheme, to enable both time-scale and power-scale coordination in a distributed microgrid system. As an example, the proposed technique is applied to the coordinating regulation of a hybrid energy storage system composed of batteries and supercapacitors. With an effective frequency-domain shaping of the virtual output impedances, the battery and supercapacitor converters are designed to absorb low-frequency and high-frequency power fluctuations, respectively. In this way, their complementary advantages in energy and power density can be effectively exploited. Furthermore, the proposed concept can be integrated into a mode-adaptive power management framework with autonomous mode transitions. The entire solution features highly versatile functions based on fully decentralized control. Therefore, both flexibility and reliability can be enhanced. The effectiveness of the presented solution is verified by experimental results.
Wang J, Wang Y, Gu Y, et al., 2015, Synchronous frequency resonance of virtual synchronous generators and damping control, Pages: 1011-1016
LI W, GU Y, WANG Y, et al., 2015, Control architecture and hierarchy division for renewable energy DC micro grids, Automation of Electric Power Systems, Vol: 39, Pages: 156-163
Gu Y, Zheng W, Li W, et al., 2015, Self-disciplined stabilization of DC microgrids by passivity-based control, Pages: 1838-1844
LUO Q, YANG H, GU Y, et al., 2015, Hybrid LLC Converter With Input Voltage Auto-balance Ability, Proceedings of the CSEE, Vol: 2, Pages: 026-026
Wang Y, Gu Y, Li W, et al., 2015, Analysis of pre-compensator for disturbance signal elimination in single-phase inverters with virtual vector control, Pages: 157-162
Li C, Gu Y, Li W, et al., 2015, Analysis and compensation of dead-time effect considering parasitic capacitance and ripple current, Pages: 1501-1506
Wuhua LI, Chi XU, Hongbin YU, et 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
Cui W, Luo H, Gu Y, et al., 2015, Hybrid-bridge transformerless photovoltaic grid-connected inverter, IET Power Electronics, Vol: 8, Pages: 439-446
Gu Y, Chi Y, Li Y, et al., 2015, DC symmetrical component method for analysis and control of bipolar LVDC grid, Pages: 2802-2807
Gu Y, Wang Y, Xiang X, et al., 2014, Improved virtual vector control of single-phase inverter based on unified model, IEEE Transactions on Energy Conversion, Vol: 29, Pages: 611-618
Xu C, Yu H, Gu Y, et al., 2014, Duty cycle-based start-up control for a ZVS bidirectional DC-DC converter, Pages: 3046-3050
Ali A, Gu Y, Xu C, et 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
Gu Y, Xiang X, Li W, et 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
Zhao Y, Xiang X, Li C, et 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
Li W, Xu C, Yu H, et 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
Huifen L, Yunjie G, Hongibin Y, et al., 2013, RESEARCH OF SIMULATION SYSTEM OF PV ON-GRID POWER GENERATION BASED ON DSP, Acta Energiae Solaris Sinica, Vol: 8, Pages: 006-006
Xu C, Gu Y, Luo H, et al., 2013, Performance analysis of coupled inductor based multiple-input DC/DC converter with PWM plus phase-shift (PPS) control strategy, Pages: 994-998
Gu Y, Li W, Zhao Y, et 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
Yang B, Li W, Gu Y, et al., 2012, Improved transformerless inverter with common-mode leakage current elimination for a photovoltaic grid-connected power system, IEEE transactions on power electronics, Vol: 27, Pages: 752-762
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