Modeling and Stability Analysis in z-s Domain of Micro Photovoltaic Inverter
The stable operation of micro photovoltaic inverter is a major requirement to connect to the power grid safely and reliably.The state space averaging model is one of traditional analysis models to study the stability of micro photovoltaic inverter.However,the state space averaging model ignores the switching process,which is difficult to ac-curately describe the stability of micro photovoltaic inverter.Thus,considering the switching process,a z-s domain modeling method is proposed.Firstly,each working mode of the micro photovoltaic inverter is analyzed,and the dis-crete iterative equations are listed.Secondly,the state variables are separated into steady state and disturbance,and the discrete iterative equations are linearized.Then,the linear discrete iterative equation is converted to the frequency domain,and the z-domain transfer function is derived.The model is converted from the z-domain to the s-domain by bilinear transformation method,and z-s domain model is obtained.Finally,the correctness and effectiveness of the pro-posed modeling method for the stability analysis of micro photovoltaic inverter is verified by simulation and experi-ments compared with the state space averaging model.
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