Resonance analysis of multiple grid‐connected inverters’ series and parallel network

Abstract Multiple inverters are connected to the distribution network with complex non‐linear loads and may interact background harmonics in some cases. In addition parallel resonance caused by harmonic current, voltage also causes series resonance. The matching of frequencies current results serious distortion grid‐connected bus waveform, or even threatens stability its operating point. A general method analyze multiple is yet be proposed. view this, authors provide an inverter model analytical traverse all points. Two typical control were modelled under transfer function model, defects traditional modal analysis traversing analyzed. Then, propose use improved adding virtual branches for analysis. obtained consistent frequency sweeping simulation results, verifying effectiveness proposed method. order prove generality inverters, suppress grid was incorporated into case study. Using resonance, participation factor values each node loop mode calculated. Finally, verified hardware‐in‐the‐loop simulation, result shows universality.