A web-based real-time monitoring and control system for laboratory Microgrid systems: Part II — Transient analysis

This paper presents the simulated and measured results of switching transients of the laboratory Microgrid system of the companion paper in Part I that implements a web-based monitoring system using an industrial PLC and campus internet. The studied laboratory Microgrid system consists of two wind induction generators, an AC-to-DC converter, a DC-to-AC inverter, a PV module, a UPS, and a battery module, which are operated under balanced three-phase loading conditions. The equivalent-circuit system model of each subsystem based on a qd-axis reference frame is combined together to formulate the complete dynamic system equations of the studied Microgrid system. The nonlinear transient responses of the studied Microgrid system under various operating modes are also compared with the measured results to determine dynamics of the studied system under different rotor speeds of wind induction generators and various insolation of PV. It can be concluded from the simulated and experimental results of this paper that the proposed system models are valid and feasible to study the dynamic stability of a laboratory Microgrid system.