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Energies 2017, 10(10), 1528; doi:10.3390/en10101528

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

1
School of Electrical Engineering, Xi’an Jiaotong University, No. 28, West Xianning Road, Xi’an 710049, China
2
Xuji Group Corporation, State Grid Corporation of China, No. 1298, Xuji Road, Xuchang 461000, China
3
Department of Precision Instrument, Tsinghua University, No. 30, Shuangqing Road, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Received: 11 August 2017 / Revised: 25 September 2017 / Accepted: 26 September 2017 / Published: 1 October 2017
(This article belongs to the Section Electrical Power and Energy System)
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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. View Full-Text
Keywords: VSC-HVDC; direct power control; grid voltage unbalance; sliding mode control; integral control; resonant control VSC-HVDC; direct power control; grid voltage unbalance; sliding mode control; integral control; resonant control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yang, W.; Zhang, A.; Li, J.; Li, G.; Zhang, H.; Wang, J. Integral Plus Resonant Sliding Mode Direct Power Control for VSC-HVDC Systems under Unbalanced Grid Voltage Conditions. Energies 2017, 10, 1528.

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