Avoiding instabilities in power electronic systems: toward an on-chip implementation

• Published in: IET power electronics Vol. 10; no. 13; pp. 1778 - 1787
• Main Authors: Abusorrah, Abdullah, Mandal, Kuntal, Giaouris, Damian, El Aroudi, Abdelali, Al-Hindawi, Mohammed M, Al-Turki, Yusuf, Banerjee, Soumitro
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 27.10.2017
• Subjects: circuit stability; complex power electronic systems; control loop design; control system synthesis; controller chips; fast‐timescale instability; Filippov approach; Filippov method; interconnected converters; microgrids; multiinput multioutput converters; on‐chip implementation; periodic orbit; power integrated circuits; Research Article; resonant converters; saltation matrices; slow‐timescale instability; state transition matrices; state‐space averaging technique; steady‐state performances; switching event; transient performance; periodic orbit; state-space averaging technique; steady-state performances; multiinput multioutput converters; control system synthesis; switching event; transient performance; complex power electronic systems; controller chips; Filippov approach; fast-timescale instability; state transition matrices; resonant converters; Filippov method; interconnected converters; microgrids; circuit stability; saltation matrices; power integrated circuits; on-chip implementation; slow-timescale instability; control loop design
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2017.0147

The available controller chips for power electronic systems are used for specific transient and steady-state performances. In such systems, the parameter ranges for stable operation are delimited by slow-timescale as well as fast-timescale instabilities. The usual practice is to design the control loop based on the state-space averaging technique, which cannot predict the fast-timescale instabilities. In this study, the first attempt has been made to propose a new design of the controller chip that can suppress these instabilities, thus extending the stable operating range in the parameter space. For this, the authors make use of the Filippov method which can effectively predict both types of instabilities. In this approach, the stability of the system is obtained in terms of the state transition matrices across each subsystem and saltation matrices across each switching event. The basic idea is to exercise control over the saltation matrices to increase the stability margin of the periodic orbit. Since in the Filippov approach an increase in the number of switching events in a cycle does not increase the complexity of the analysis, the proposed controller chip will be particularly useful in complex power electronic systems such as interconnected converters, multi-input multi-output converters, resonant converters, micro-grids and so on.