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Accurate measurement of distortions in low-voltage DC (LVDC) grids is crucial for reliable renewable energy integration. This study presents two traceable measurement systems designed for both lab and field use, ensuring low uncertainties for assessing DC grid dynamics.

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Area of Science:

  • Electrical Engineering
  • Power Systems
  • Metrology

Background:

  • Modern energy infrastructure increasingly integrates renewable energy sources and direct current (DC) technologies.
  • Low-voltage DC (LVDC) grids offer efficiency benefits but require understanding DC distortions for reliable operation.
  • Traditional AC measurement techniques are insufficient for assessing DC distortions.

Purpose of the Study:

  • To develop and present two traceable measurement chains for accurately quantifying DC distortions in LVDC grids.
  • To provide low-uncertainty measurements of steady-state DC components, distortion amplitude, and frequency.
  • To enable reliable assessment of dynamic behavior in future LVDC grids.

Main Methods:

  • Development of two complementary, traceable measurement chains for DC distortion analysis.
  • One chain optimized for controlled laboratory environments, the other for flexible field applications.
  • Characterization of hardware with detailed uncertainty budgets and evaluation of measurement methodologies.

Main Results:

  • Both measurement chains achieve low uncertainties (0.01% to <1%) for voltages up to 1000 V and currents up to 30 A.
  • Frequency components of distortions up to 150-500 kHz can be accurately measured.
  • The presented methods overcome limitations of conventional AC techniques for DC distortion assessment.

Conclusions:

  • The developed measurement systems provide accurate and reliable data for DC distortions in LVDC grids.
  • These tools are essential for understanding and ensuring the stability of future DC-powered energy infrastructures.
  • The findings support the effective integration of renewable energy and DC technologies.