Study on the modeling and control of photo-storage integrated system based on the three-phase bridge
In order to solve the problem of photovoltaic power generation with fluctuation and the phenomenon of"light abandonment",this paper proposes a topological structure of optical storage converter based on three-phase bridge and its related control strategy.The structure can realize the power flow between photovoltaic power supply,battery and load,and has the advantages of soft switching properties of LLC resonant converters,high efficiency,wider adaptability to the input volt-age range,and high power density.In terms of control strategy,the maximum power point tracking is realized by using the conductance increment method with compound feedback.In order to realize the voltage stability of the common inductor and the DC bus of the bidirectional DC-DC converter,the du-al frequency control method is used to determine the double closed-loop control of inductor and the outer loop of voltage and the inner loop of current.To ensure the voltage stability of the output load,the LLC resonant converter adopts the frequency modulation control of voltage closed-loop.Finally,the simulation model and experimental platform of the integrated optical storage system are built.The simulation and experimental results show that the new optical storage system is simple in structure,stable in operation and easy to implement.
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