Experimentally Validated Reduced-Order Models for Grid-Connected Inverters Using Balanced Residualization

With an increasing share of power-electronics inter-faced generation units in the energy mix, the demand for accurate dynamic transient simulations of power grids rises. Up to now, such simulations often employ highly simplified inverter models that neglect the inner control loops by replacing them with ideal voltage or current sources. In this paper, we present inner loop models for both voltage and current control modes based on first principles. We use the balanced residualization approach to derive reduced-order models, which cover a middle ground between highly simplistic ideal sources and computationally expensive full-order models. The models are validated against experimental data in a Power-Hardware-in-the-Loop laboratory.