Journal
ELECTRIC POWER SYSTEMS RESEARCH
Volume 194, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2020.107020
Keywords
Modular multilevel converter; STATCOM; Unbalanced network voltage; Voltage compensation
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- National Council for Scientific and Technological Development (CNPq)
- State Funding Agency of Minas Gerais (FAPEMIG)
- National Institute for Electric Energy (INERGE)
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This paper introduces a compensation strategy for negative-sequence voltage in a distribution network using a static synchronous compensator based on a modular multilevel converter. Mathematical relations and controllers are used to compensate for unbalanced voltages, with experimental and simulation results demonstrating feasibility and performance.
This paper presents a negative-sequence voltage compensation strategy of a distribution network by using a static synchronous compensator based on modular multilevel converter. Mathematical relations of the static compensator are used to derive small-signal linearised models, in the synchronous reference frame, and to design voltage and current controllers to compensate for unbalanced voltages at the point of common coupling. Moreover, a comprehensive model of the DC bus voltage with a control loop implementation are presented. Furthermore, a notch filter is connected in the feedback path of the DC voltage control loop to eliminate the oscillation in the DC voltage. Digital simulations results, obtained with a 10 MVA / 24 kV MMC-DSTATCOM with 14 submodules per arm, will be used to validate the small-signal linearised mathematical models, and the performance of the designed controllers, during steady-state and faulty grid conditions. In addition experimental results obtained with a small-scale MMC prototype, with 03 submodules per arm, will be presented to demonstrate the feasibility of the compensation strategy proposed here.
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