Adaptability Analysis of Directional Element in Photovoltaic-Connected Lines

With the economy development, the structure of power system becomes more and more complex, and the structure of high-voltage distribution network tends to be ring network. Therefore, the application of directional elements is more and more extensive. With a large number of distributed photovoltaics connected to the distribution network, the applicability of traditional protection principles has been challenged to some extent. Therefore, the applicability of traditional directional elements has also attracted extensive attention. This paper first analyzes the working principle of the directional element and the short-circuit characteristics of the photovoltaic inverter, and then builds the simulation model, and analyzes the influence of the photovoltaic inverter on the directional element, and the simulation results are analyzed comprehensively. The simulation and analysis results show that the traditional 90 degree directional element can withstand the influence of the mass access of distributed photovoltaic.