Security Analysis of Distribution Network Loop Closure Based on Half Invariant Method

Abstract

The integration of distributed power sources requires active power systems to raise new concerns about their safety. In order to scientifically and effectively analyze the safety of active distribution network closing current, taking photovoltaic power supply as an example, a closed-loop equivalent model considering the influence of distributed power sources was proposed, and an equation based on the random fluctuation current of new energy sources was derived. On this basis, a semi invariant method is used to solve the random fluctuation variable of the required current, and corresponding indicators are developed based on the principle of closed loop safety to evaluate the safety of the closed loop current. Based on PSCAD and MATLAB platforms, simulation calculations were conducted, and the simulation and calculation values were compared to verify the feasibility and timeliness of the closed-loop security analysis model based on the semi invariant method.