PIDR Sliding Mode Current Control with Online Inductance Estimator for VSC-MVDC System Converter Stations under Unbalanced Grid Voltage Conditions

Weipeng Yang, Hang Zhang, Jungang Li, Aimin Zhang, Yunhong Zhou and Jianhua Wang
Additional contact information
Weipeng Yang: School of Electrical Engineering, Xi’an Jiaotong University, No.28, West Xianning Road, Xi’an 710049, China
Hang 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
Aimin Zhang: School of Electrical Engineering, Xi’an Jiaotong University, No.28, West Xianning Road, Xi’an 710049, China
Yunhong Zhou: 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, 2018, vol. 11, issue 10, 1-20

Abstract: This study aims to present a novel proportional-integral-derivative-resonant law-based sliding mode current control strategy with online inductance estimator (PIDR-SMCC-OIE) for voltage source converter medium voltage direct current (VSC-MVDC) system converter stations under unbalanced grid voltage conditions. A generalized current reference calculation method, by which the ratio of the amplitude of the active power ripple to that of the reactive power ripple can be continuously controlled without current distortion is presented. A dynamic model of the current control errors in the positive sequence synchronous reference frame is developed, and a PIDR law-based sliding mode current controller is designed, where derivatives of the current references are obtained by simple algebraic operations. An OIE adopting the dynamic filtering method and gradient algorithm is proposed to further improve system robustness. In this OIE, the converter pole voltages are obtained by computation utilizing the gate signals of the switching devices and the DC bus voltage, so that no additional voltage sensors are needed. To verify effectiveness of the PIDR-SMCC-OIE strategy, simulation studies on a two-terminal VSC-MVDC system are conducted in PSCAD/EMTDC. The results show it can provide satisfactory performance over a wide range of operating conditions.

Keywords: VSC-MVDC; current control; proportional-integral-derivative-resonant control; sliding mode control; grid voltage unbalance; online inductance estimator (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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