Impedance-based stability analysis and design considerations for DC current distribution with long transmission cable

Stability is a major concern for dc distribution systems because the integrated system may become unstable even though the subsystems are stable individually. Significant analysis and design has been applied to dc voltage distribution systems, while stability and related control design are not well studied for dc current distribution systems, especially for the scenarios with long transmission cables. In this paper, impedance expressions for long transmission cables are derived and applied to analyze stability of power converters in dc current distribution systems. The relation between converter closed-loop and open-loop input impedance is discussed by taking a series resonant converter (SRC) with constant current input and regulated output current as an example. Impedance-based stability analysis and design considerations are proposed by employing the Nyquist plot of the system minor loop gain. The stability analysis and design presented are validated through experimental results based on a system with a 1 A current source, a 100 km cable emulator and a 500 W SRC.

[1]  H. Pinheiro,et al.  Design and Implementation of a Robust Current Controller for VSI Connected to the Grid Through an LCL Filter , 2009, IEEE Transactions on Power Electronics.

[2]  Regan Zane,et al.  Analysis and design of a series resonant converter with constant current input and regulated output current , 2017, 2017 IEEE Applied Power Electronics Conference and Exposition (APEC).

[3]  J. Kyyra,et al.  Modeling of multiport DC busses in power-electronic systems , 2013, 2013 IEEE International Conference on Industrial Technology (ICIT).

[4]  Bin Wu,et al.  A Medium-Frequency Transformer-Based Wind Energy Conversion System Used for Current-Source Converter-Based Offshore Wind Farm , 2017, IEEE Transactions on Power Electronics.

[5]  Fred C. Lee,et al.  A method of defining the load impedance specification for a stable distributed power system , 1993 .

[6]  Regan Zane,et al.  Design considerations for series resonant converters with constant current input , 2016, 2016 IEEE Energy Conversion Congress and Exposition (ECCE).

[7]  Regan Zane,et al.  Control of series connected resonant converter modules in constant current dc distribution power systems , 2016, 2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL).

[8]  J. Kojima,et al.  Novel current to current converter for mesh-like scientific underwater cable network-concept and preliminary test result , 2003, Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492).

[9]  R. D. Middlebrook,et al.  Input filter considerations in design and application of switching regulators. , 1976 .

[10]  Jian Sun,et al.  Voltage Stability and Control of Offshore Wind Farms With AC Collection and HVDC Transmission , 2014, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[11]  D.J. Perreault,et al.  Synthesis of Lumped Transmission-Line Analogs , 2007, IEEE Transactions on Power Electronics.

[12]  Shuai Jiang,et al.  Resonance Issues and Damping Techniques for Grid-Connected Inverters With Long Transmission Cable , 2014, IEEE Transactions on Power Electronics.

[13]  Philip T. Krein,et al.  Differential Power Processing for DC Systems , 2013, IEEE Transactions on Power Electronics.

[14]  Fred C. Lee,et al.  Stability margin monitoring for DC distributed power systems via perturbation approaches , 2003 .

[15]  Konstantin Turitsyn,et al.  Stability, control, and power flow in ad hoc DC microgrids , 2016, 2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL).

[16]  Jian Sun,et al.  Impedance-Based Stability Criterion for Grid-Connected Inverters , 2011, IEEE Transactions on Power Electronics.

[17]  Marek Szpek,et al.  400VDC distribution architectures for central offices and data centers , 2014, 2014 IEEE 36th International Telecommunications Energy Conference (INTELEC).

[18]  Leila Parsa,et al.  Series-Input Parallel-Output Modular-Phase DC–DC Converter With Soft-Switching and High-Frequency Isolation , 2016, IEEE Transactions on Power Electronics.

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

[20]  Xinbo Ruan,et al.  Impedance-Based Local Stability Criterion for DC Distributed Power Systems , 2015, IEEE Transactions on Circuits and Systems I: Regular Papers.