Home  »  News  »  Press Releases  »  SLC Seminar Series kicks off with Wenchao Cao on Friday, Jan. 15th

The CURENT SLC Seminar Series begins on Friday, Jan. 15th. Wenchao Cao will be the presenter. The series is held every Friday from 12:20 PM - 1:10 PM EDT in Min Kao Building, Room 525 unless otherwise specified. 

Title: Stability Criterion and Controller Parameter Design of Radial-Line Renewable Systems with Multiple Inverters

Abstract: To address the instability issue in renewable systems of a radial-line structure with multiple current-controlled interface inverters, this paper proposes a practical stability criterion to easily analyze the system stability and a controller parameter design method to guarantee stable system operation with good oscillation damping performance. The proposed impedance-based sufficient stability criterion does not need the pole calculation of the return ratio matrices, while the phase margin of the system can still be obtained for system dynamic performance evaluation. Based on the phase margin information, design rules of inverter controller parameters are further proposed for system stability. The output admittance model of current-controlled inverters in an arbitrary d-q frame is also derived to facilitate the stability analysis. Simulation and experimental results verify the effectiveness of the proposed stability criterion and controller parameter design method.

Bio: Wenchao Cao is a Ph.D. student in Electrical Engineering at the University of Tennessee, Knoxville, United States. He received his B. S. degree in the major of Automation and M. S. degree in the major of Control Theory and Control Engineering from Huazhong University of Science and Technology, Wuhan, China, in 2008 and 2011, respectively. His research interests include renewable energy integration, stability of grid-connected converters and high efficiency motor drives for electric vehicle applications.

Steaming InformationWatch via WebEx

Meeting Number: 620 016 915

Meeting Password: power

Call-in Number: 1-650-479-3208 Access Code: 620 016 915

 

Stability Criterion and Controller Parameter Design of Radial-Line Renewable Systems with Multiple Inverters

By Wenchao Cao

To address the instability issue in renewable systems of a radial-line structure with multiple current-controlled interface inverters, this paper proposes a practical stability criterion to easily analyze the system stability and a controller parameter design method to guarantee stable system operation with good oscillation damping performance. The proposed impedance-based sufficient stability criterion does not need the pole calculation of the return ratio matrices, while the phase margin of the system can still be obtained for system dynamic performance evaluation. Based on the phase margin information, design rules of inverter controller parameters are further proposed for system stability. The output admittance model of current-controlled inverters in an arbitrary d-q frame is also derived to facilitate the stability analysis. Simulation and experimental results verify the effectiveness of the proposed stability criterion and controller parameter design method.

Bio: Wenchao Cao is a Ph.D. student in Electrical Engineering at the University of Tennessee, Knoxville, United States. He received his B. S. degree in the major of Automation and M. S. degree in the major of Control Theory and Control Engineering from Huazhong University of Science and Technology, Wuhan, China, in 2008 and 2011, respectively. His research interests include renewable energy integration, stability of grid-connected converters and high efficiency motor drives for electric vehicle applications.