Novel Fault Distance Estimation Method for Lines Connected to Converter-based Generation

Distance protection is extensively used in distribution and transmission grids world wide. However, due to the increased uptake of power electronic converters, traditional distance protection can fail. The present paper proposes a novel fault distance estimation method for lines linked to power electronic converters. By first eliminating the fundamental frequency components from voltage and current measurements, the method calculates different possible fault locations. The true fault location is found where the calculated fault impedance is purely resistive. First the concept of the proposed method is described after which the mathematical calculations behind the method are elaborated. Finally, transient simulations show the potential of this novel method.