Transient interaction characterization and stable operation domain sculpting for heterogeneous inverters
To improve the transient stability operation performance of heterogeneous inverter parallel systems under fault conditions,a system transient stability operation domain optimization method considering the transient interaction characteristics of heterogeneous inverters was proposed.A transient mathematical model of a parallel system of heterogeneous inverters was established.The impact of the output current amplitude and phase of grid-following(GFL)inverters on the stability performance of grid-forming(GFM)inverters was qualitatively analyzed using power angle curves.Then,by calculating the critical clearing time(CCT)of the GFM inverter,the mapping relationship between the output current amplitude and phase of the GFL inverter and the transient stability boundary of the GFM inverter was quantitatively characterized.Based on this,the stable operation domain of the GFL inverter output current was derived by taking into account the transient stability constraints of the GFM inverter and the capacity constraints of the GFL inverter.Finally,the correctness of the current feasible domain was verified by simulation.
grid-following invertergrid-forming inverterheterogeneous inverterstransient stabilitytransient optimal control
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