Modeling and Simulation of a Reduced-Order Single-Phase PQ Inverter Using the Dynamic Phasor Method

The accurate study of an inverter-based energy source is usually performed with the detailed inverter model. However, to perform system-level studies in microgrids, the time to simulate the system increases exponentially as more de-tailed inverter models are added. This paper presents a computationally efficient model of a single-phase PQ inverter based on the dynamic phasor (DP) method. By using the PQ theory and establishing a relationship between the direct-quadrature axis components of the synchronous reference frame and the DP real and imaginary components, independent control of the active and reactive power is realized. The fidelity of the DP-based single-phase PQ inverter model is verified by validating it against a detailed single-phase PQ inverter model implemented in Simulink/Simscape (SS). Simulation results reveal that the DP model can predict transients accurately, using a step size 125 times larger than the detailed SS model’s step size. The proposed DP-based PQ inverter model is suitable for fast-paced system-level studies of a multiple inverter based single-phase microgrid.