Design of a Controller for the Microgrid to Enhance Stability and Synchronization Capability

In this study, a state feedback controller is designed for a linearized model of a diesel generator-based generation plant and a battery storage-based inverter model plant. The diesel generator plant and inverter-based battery storage system constitute as a microgrid. The microgrid is a localized power system network and minimized the mismatch between the generation and loads in a specific region. Thus, to achieve better performance and stability, a proposed controller is designed for microgrid. The stability convergence of the control law is analyzed through Lyapunov stability theorem as well as the Nyquist diagram stability criteria. The proposed controller improves the overall system performance in the presence of initial parameter variation and mechanical shaft power random step variations by reducing over/under shoots, settling time and oscillations. In addition, the proposed controller regulated both diesel generator model and inverter-based DG independently. The performance, stability and ability to keep in synchronism of the proposed control scheme are validated on a diesel generator and inverter-based battery storage model simulated in MATLAB©.