Propuesta de un esquema de alivio de carga para microrredes usando la norma IEC 61850 y la tasa de cambio de la frecuencia.

Abstract

The paper presents an algorithm for an adaptive Load Shedding Scheme (LSS), based on the IEC 61850 standard and the Fast Frequency Change Protection (FRoCoF). A Python algorithm is developed and implemented in the Spyder environment, which facilitates the coordination between renewable and thermal sources in a microgrid modeled in PowerFactory. The microgrid includes non-dispatchable generation sources, such as wind and PV, as well as dispatchable generation sources, such as thermal, a battery energy storage system (BESS), and the utility grid supply. A communications architecture has been established according to IEC 61850 standard to obtain electrical measurements and send GOOSE messages for automatic load disconnection. The frequency protections of the fast RoCoF have been adjusted by means of dynamic simulations. In the validation phase, the EAC is tested against contingencies such as grid disconnection and loss of a renewable source. The results obtained allow determining the LSS tripping times and the optimal load to be disconnected. An improvement in the tripping times of the proposed LSS compared to the traditional LSS is verified.