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Bounded Control that Preserves System Stability and its Applications

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Most engineering systems are open-loop stable. However, in order to cope with uncertainties and disturbances that widely exist in practice, different feedback control strategies are adopted to achieve desired performance, which makes feedback control one of the most fundamental concepts in control engineering. However, feedback control could destabilize systems that are open-loop stable. In this talk, a bounded controller that preserves the open-loop stability is presented at first. Then, three applications of the bounded controller are presented: 1) to equip synchronverters (power electronic converters that mimic conventional synchronous machines) with guaranteed stability under normal and abnormal grid conditions; 2) to limit the input current of three-phase PWM rectifiers; 3) and to achieve current-limiting droop control for parallel-operated inverters. These pave a way to solve the challenging problems of future power electronics-enabled power systems in terms of stability and current-limiting capability.

Biosketch: Dr. Qing-Chang Zhong is the Max McGraw Endowed Chair Professor in Energy and Power Engineering at Dept. of Electrical and Computer Engineering, Illinois Institute of Technology, Chicago, USA , and a Research Professor at the University of Sheffield, UK. He is well recognized worldwide as one of the very few leading experts in both control and power electronics, serving as a Distinguished Lecturer for the IEEE Control Systems Society and the IEEE Power Electronics Society. Before joining Illinois Institute of Technology, he was the Chair Professor in Control and Systems Engineering at The University of Sheffield, UK, where he built up a $5M+ research lab dedicated to the control of energy and power systems and attracted the support of Rolls-Royce, National Instruments, Texas Instruments, Siemens, ALSTOM , Turbo Power Systems, Chroma, Yokagawa, OPAL RT and other organizations. He obtained a PhD degree in 2000 from Shanghai Jiao-Tong University and another PhD degree in 2004 from Imperial College London (awarded the Best Doctoral Thesis Prize). He (co-) authored three research monographs, including Robust Control of Time-delay Systems (Springer, 2006) and a No. 7 Amazon Best Seller Control of Power Inverters in Renewable Energy and Smart Grid Integration (Wiley-IEEE Press, 2013). His fourth research monograph entitled Power Electronics-Enabled Autonomous Power Systems: Next Generation Smart Grids is scheduled for publication by Wiley-IEEE. He is an Associate Editor of four IEEE Transactions in control and power electronics, including IEEE Trans. on Automatic Control, IEEE Trans. on Control Systems Technology, IEEE Trans. on Industrial Electronics, and IEEE Trans. on Power Electronics. His current research focuses on advanced control theory and power electronics, together with their applications in various industrial sectors.

This talk is part of the CUED Control Group Seminars series.

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