The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS
Transactions ID Number: 52-475
Full Name: Daqing He
Position: Ph.D. Candidate
Age: ON
Sex: Female
Address: Mulan Chuanjian Building B107,Shanghai Jiaotong University, Shanghai,200240,P.R.China
Country: CHINA
Tel: 86-21-34207001
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E-mail address: hhddqq@sjtu.edu.cn
Other E-mails: hdqing_future@hotmail.com
Title of the Paper: flatness-based feedforward control of modular multilevel HVDC
Authors as they appear in the Paper: Daqing He, Xu Cai
Email addresses of all the authors: hhddqq@sjtu.edu.cn, xucai@sjtu.edu.cn
Number of paper pages: 11
Abstract: Voltage source converter HVDC is definitely a competitive option to connect large scale wind energy to grid, which is able to generate lagging or leading reactive power. But the limitation power electronic devices in terms of current and voltage capabilities necessitates the use of series connected and multilevel converters in order to increase the operating voltage of converters. Modular multilevel converter-based HVDC make sub module switches in line frequency and converter outputs step waveform. So its control system has a long sampling period and slow dynamic response. The conventional cascade control of modular multilevel converter HVDC would not behave well as the power change sharply or the fault of grid happens. To enhance its dynamic performance the feed forward control is used here because it tracks reference faster than feed back. The paper designs such a feed forward controller based on differential flatness which can enhance dynamic performance. Finall!
y the operate condition of step response of command and ride-through low voltage have been simulated to demonstrate the effect of the controller.
Keywords: Voltage source converter high voltage direct current; Modular multilevel converter; Flatness; Feed forward; Cascade control; Ride-through low voltage
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