LCL-Filter Design for Low-Voltage High-Power Grid-Tied Voltage-Source Converter Considering Various Damping Methods

Kantar E., HAVA A. M.

17th IEEE Workshop on Control and Modeling for Power Electronics (COMPEL), Trondheim, Norway, 27 - 30 June 2016 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Trondheim
  • Country: Norway
  • Keywords: LCL-filter, damping, design, PWM, power harmonic filters, power quality, resonant frequency
  • Middle East Technical University Affiliated: Yes

Abstract

The limited switching frequency, size and weight concerns, and the stringent limits for the injected grid current harmonics challenge the implementation of LCL grid filters for low-voltage multi-megawatt (multi-MW) renewable energy converters. Traditional design procedures of such filters employed in low power and high switching frequency converters may not hold for a multi-MW filter interfacing a low-voltage converter switching at low frequency to the electric grid. This paper proposes an LCL-filter design algorithm spanning a wide power range of multi-MW converters where impacts of favored current control method, damping method and pulse-width modulation (PWM) technique are reflected within the design phase. Filter design algorithm was tested under 0.5, 1, and 2-MVA applications. The impacts of designated damping and current control methods were elaborated in terms of dynamic and steady-state performance using 1-MVA converter design case.