Stability-improvement method of cascaded DC-DC converters with additional voltage-error mutual feedback control

The interaction between the source and load converters in cascaded DC-DC converters may cause instability. Thus, improving the stability of cascaded DC-DC converters is important. To solve the above-mentioned problem, a flowchart to improve the control method is established by calculating the eigenvalue sensitivity of a time-domain model of cascaded DC-DC converters. Further, an additional voltage-error mutual feedback control method is firstly proposed based on the flowchart provided in this study to improve the stability of cascaded DC-DC converters. Subsequently, the influence of the proposed mutual feedback control on the stability of cascaded DC-DC converters is analyzed. Finally, the effectiveness of the proposed control method is verified by simulation and experiment.

[1]  Xinbo Ruan,et al.  Adaptive Active Capacitor Converter for Improving Stability of Cascaded DC Power Supply System , 2013, IEEE Transactions on Power Electronics.

[2]  D.M. Vilathgamuwa,et al.  Decoupling Load and Power System Dynamics to Improve System Stability , 2005, 2005 International Conference on Power Electronics and Drives Systems.

[3]  Xin Zhang,et al.  Stabilization of Cascaded DC/DC Converters via Adaptive Series-Virtual-Impedance Control of the Load Converter , 2016, IEEE Transactions on Power Electronics.

[4]  S.M. Ayob,et al.  Simulation and experimental results of the bi-directional DC-DC converter operating as an active damping device in a simple system , 2005, 2005 International Conference on Power Electronics and Drives Systems.

[5]  Gehan A. J. Amaratunga,et al.  Long-Lifetime Power Inverter for Photovoltaic AC Modules , 2008, IEEE Transactions on Industrial Electronics.

[6]  Young-Seok Kim,et al.  Study of the control technique of the voltage bus conditioner for a DC power distribution system with multiple parallel loads in the electrical vehicle , 2011, 2011 International Conference on Electrical Machines and Systems.

[7]  Enrico Santi,et al.  Modeling and Stability Analysis of Cascaded Multi-Converter Systems Including Feedforward and Feedback Control , 2008, 2008 IEEE Industry Applications Society Annual Meeting.

[8]  Dylan Dah-Chuan Lu,et al.  A Novel Stabilization Method of LC Input Filter With Constant Power Loads Without Load Performance Compromise in DC Microgrids , 2015, IEEE Transactions on Industrial Electronics.

[9]  Jian Sun,et al.  Constant-Power Load System Stabilization by Passive Damping , 2011, IEEE Transactions on Power Electronics.

[10]  Young-Seok Kim,et al.  An adaptive control of the bidirectional DC/DC converter with the capacitive energy storage in the more and all-electric aircraft systems , 2010, 2010 International Conference on Electrical Machines and Systems.

[11]  Ali Emadi,et al.  Loop-Cancellation Technique: A Novel Nonlinear Feedback to Overcome the Destabilizing Effect of Constant-Power Loads , 2010, IEEE Transactions on Vehicular Technology.

[12]  Xin Zhang,et al.  Stabilization of a Cascaded DC Converter System via Adding a Virtual Adaptive Parallel Impedance to the Input of the Load Converter , 2016, IEEE Transactions on Power Electronics.

[13]  Fred C. Lee,et al.  Impedance specifications for stable DC distributed power systems , 2002 .

[14]  Philip T. Krein,et al.  The power buffer concept for utility load decoupling , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[15]  Trillion Q. Zheng,et al.  An extensible stability analysis method in time domain for cascaded DC-DC converters in electrical vehicles , 2018, Microelectron. Reliab..

[16]  Zhengxi Li,et al.  Large signal stability analysis for constant power loads with RC parallel damping filters , 2014, 2014 17th International Conference on Electrical Machines and Systems (ICEMS).

[17]  M. Ehsani,et al.  Negative impedance stabilizing controls for PWM DC-DC converters using feedback linearization techniques , 2000, Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022).

[18]  Sandeep Anand,et al.  Eigenvalue sensitivity analysis of microgrid with constant power loads , 2014, 2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES).

[19]  P. Cochat,et al.  Et al , 2008, Archives de pediatrie : organe officiel de la Societe francaise de pediatrie.

[20]  Enrico Santi,et al.  Comprehensive Review of Stability Criteria for DC Power Distribution Systems , 2014, IEEE Transactions on Industry Applications.