Journal
ELECTRIC POWER SYSTEMS RESEARCH
Volume 157, Issue -, Pages 227-237Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2017.12.031
Keywords
HVDC transmission; ac-dc power converter; Multilevel converter; State feedback; Scheduling
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Funding
- CONICYT / FONDECYT [1181839]
- CONICYT / FONDAP [15110019]
- CONICYT [NEWTON-PICARTE DPI20140007]
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In this work, a feedback linearization controller together with a gain scheduling function is proposed in order to control a high-voltage direct-current transmission system (VSC-HVDC), composed by two three-phase three-level neutral point clamped converters. The described dq0 model has the advantage of simplifying the mathematical analysis and does not disregard the zero-dynamics, against other reported solutions. In addition, based on the input-output linearization a direct current control (DCC) for the whole VSC-HVDC system is presented, where the control tasks are distributed between both converters. Moreover, a control loop to balance, in an independent way the voltage between capacitors at each converter is designed. Additionally, to the unbalance compensator, a gain scheduling scheme is proposed to assigning new tuning parameters for the PI controller, considering the system states as scheduling variables. The real-time simulator OPAL-RT (R) is employed as rapid prototyping and test the performance of the proposed DCC scheme. (C) 2017 Elsevier B.V. All rights reserved.
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