Integral Plus Resonant Sliding Mode Direct Power Control for VSC-HVDC Systems under Unbalanced Grid Voltage Conditions

Weipeng Yang, Aimin Zhang, Jungang Li, Guoqi Li, Hang Zhang and Jianhua Wang
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Weipeng Yang: School of Electrical Engineering, Xi’an Jiaotong University, No. 28, West Xianning Road, Xi’an 710049, China
Aimin Zhang: School of Electrical Engineering, Xi’an Jiaotong University, No. 28, West Xianning Road, Xi’an 710049, China
Jungang Li: Xuji Group Corporation, State Grid Corporation of China, No. 1298, Xuji Road, Xuchang 461000, China
Guoqi Li: Department of Precision Instrument, Tsinghua University, No. 30, Shuangqing Road, Beijing 100084, China
Hang Zhang: School of Electrical Engineering, Xi’an Jiaotong University, No. 28, West Xianning Road, Xi’an 710049, China
Jianhua Wang: School of Electrical Engineering, Xi’an Jiaotong University, No. 28, West Xianning Road, Xi’an 710049, China

Energies, 2017, vol. 10, issue 10, 1-17

Abstract: An integral plus resonant sliding mode direct power control (IRSMC DPC) strategy for voltage source converter high voltage direct current (VSC-HVDC) systems under unbalanced grid voltage conditions is proposed in this paper. Through detailed instantaneous power flow analysis, a generalized power compensation method, by which the ratio between the amplitude of active and reactive power ripples can be controlled continuously, is obtained. This enables the system to provide flexible power control, so that the desired performance of the system on both the ac and dc sides can be attained under different operating conditions. When the grid voltage is unbalanced, one or both of the active and reactive power terms contain ripples, oscillating at twice the grid frequency, to obtain non-distorted ac current. A power controller consisting of the proportional, integral and resonant control laws is designed using the sliding mode control approach, to achieve accurate power control objective. Simulation studies on a two-terminal VSC-HVDC system using MATLAB/SIMULINK (R2013b, Mathworks, Natick, MA, USA) are conducted to verify the effectiveness of the IRSMC DPC strategy. The results show that this strategy ensures satisfactory performance of the system over a wide range of operating conditions.

Keywords: VSC-HVDC; direct power control; grid voltage unbalance; sliding mode control; integral control; resonant control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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