Multimachine stability improvement with hybrid renewable energy systems using a superconducting magnetic energy storage in power systems

Abstract

Energy storage systems (ESS) have played a vital role in modern power systems to improve system stability and reliability in recent years. This paper describes the role of SMES in improving the power system stability of a multimachine interconnected with hybrid renewable energy systems (RES) such as wind and solar PV. It studies the transient stability of the system by creating a symmetrical fault in a multimachine system at various locations. The hybrid RES simulates an equivalent aggregated 75 MW photovoltaic array and a wind turbine with a capacity of 300 MW PMSG (permanent magnet synchronous generator). It couples a common DC link via a voltage source and dc/dc boost converters. A voltage source inverter connected with a step-up transformer and transmission line coupled to a multimachine system. The voltage source converter and inverter use a model predictive controller (MPC) for a better output voltage profile and to improve the system stability. A SMES is connected through a dc/dc converter with PID-SDC (Proportional Integrating Derivative Supplementary Damping Controller). It effectively suppresses power oscillations and smoothening during generation fluctuations. It reduces the low-frequency oscillations at the multimachine side during three-phase fault conditions at various locations in the system. The system's stability is improved by 3.36 s after clearing the fault. The effectiveness of the entire system is studied in the time domain simulations using MATLAB/SIMULINK software.