Frequency-coupled Admittance Modeling of VSC Grid-connected Inverter Oscillation&Influencing Factors Analysis
With the development of power system with high proportion of renewable energy and power electronic equipment,the oscillation problem between three-phase grid-connected inverters and AC grid becomes prominent.In recent years,such type of oscillation problem gradually shows the feature of mutual of different oscillation frequencies,the positive and negative sequence decoupled admittance model is no longer suitable for this oscillation analysis.Therefore,the admittance model of frequency coupling and how the different factors affect the frequency coupling require further study.Firstly,the admittance model of grid-connected inverter considering frequency coupling is established.Then the impacts of different factors on the frequency coupling are analyzed based on sensitivity method,and the parameter that can quantitatively describe the degree of system frequency coupling is given.Optimal design for PLL bandwidth that has high impact on frequency coupling is carried out,Finally,the correctness of analysis of influence factors and optimal design are validated by simulation.
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