Frequency Trajectory Planning Based Strategy for Improving Frequency Stability of Droop-Controlled Inverter Based Standalone Power Systems

Inverter-based standalone power systems (ISPSs), with limited inertia/damping, are prone to significant changes in frequency indicators encompassing deviation and rate of change (RoCoF), which can easily exceed the pertinent relay thresholds cause outages. Limited by estimating disturbance system inertia/damping deficiency, existing controls cannot ensure stability. To overcome this issue, a trajectory planning (FTP) based strategy is developed article improve stability droop-controlled ISPS. This frequency-indicator-oriented control relates several pre-defined parameters, decoupling from system's disturbances deficiency that difficult evaluate. During normal operation or when level insignificant, inverter operates standard droop mode since intrinsic features suffice regulate frequency. In event large disturbance, an FTP block triggered detected indicators, marginally safe planned according requirement grid code. case, tracking trajectory, provides suitable support needed system, thereby guaranteeing Finally, simulation experimental results proved effectiveness advancement strategy.