Pv Systems Balance Components Of Key Technologies And Research

With the thorough deepening of Chinese new energy policy and the gradual perfection of the PV industry chain, The renewable energy industry make a great development.The paper discusses the problem needed to solve about the BOS component technology for the photovoltaic power system, and analysis the output characteristics of the photovoltaic cells, gets the requirements of the PV generation system. A new topology for bidirectional interleaved DC/DC converter used in the PV power generation system is discussed. It gives the analysis of the ripple current and ripple voltage of the bi-directional interleaved DC/DC converter. In addition,the key parameter of the structure and the controller design of the bidirectional DC/DC converter is discussed. Finally, the experiment results on a bidirectional interleaved DC/DC converter are given to show a high efficiency in the static and dynamic performance and high power density.The paper analysis the charge strategy of the PV-VRLA energy storage system based on the principle of storage battery, and proposes a improved intelligent charging strategy for the system mentioned by the paper.It can better balance the life and charging speed of the storage battery than the traditional charging strategy.The paper focused on the unbalance of neutral potential of the traditional multilevel inverter.A new topology of 3-L inverter used in this system is discussed, The results of simulation and experimental show that it can solve the problem of unbalance of neutral potential. Finally,a prototype realizes some basic functions of the PV power generation system.