家庭光储系统中单相光伏逆变器蓄电池输入时并网运行控制

发布时间：2018-07-29 15:14

【摘要】：当原有的户用式光伏并网发电系统升级为家庭光储系统时,单相光伏并网逆变器需在储能电池等电压源输入条件下仍能正常并网运行。首先,建立了光伏阵列与锂电池组等效电路数学模型,分析与验证了在电压源输入条件下,两级式单相系统的二次纹波污染比光伏阵列输入条件下严重的现象。然后,通过分析两级式单相系统中的交直流耦合机理与Boost电路数学模型的建立,提出一种电流双反馈式纹波电流抑制措施。采取基于广义三阶积分的纹波提取与直流侧中间电压纹波的陷波抑制算法优化系统并网运行控制,并利用MATLAB对控制系统进行仿真分析与计算。最后,搭建了5kW并网实验系统,通过实验结果验证了所提控制策略的有效性与实用性。
[Abstract]:When the original household photovoltaic grid-connected generation system is upgraded to the home optical storage system, the single-phase photovoltaic grid-connected inverter needs to operate normally under the condition of the input voltage source such as the energy storage cell. Firstly, the mathematical model of equivalent circuit of photovoltaic array and lithium battery pack is established, and the phenomenon that the secondary ripple pollution of two-stage single-phase system is more serious than that of photovoltaic array input condition is analyzed and verified under the condition of voltage source input. Then, by analyzing the mechanism of AC / DC coupling in two-stage single-phase system and the establishment of mathematical model of Boost circuit, a current dual-feedback ripple current suppression measure is proposed. The ripple extraction algorithm based on generalized third order integral and notch suppression algorithm of DC side intermediate voltage ripple are adopted to optimize the grid-connected operation control of the system, and the simulation analysis and calculation of the control system are carried out by using MATLAB. Finally, the 5kW grid-connected experimental system is built, and the effectiveness and practicability of the proposed control strategy are verified by the experimental results.
【作者单位】：中南大学信息科学与工程学院;广西大学电气工程学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA051601) 国家自然科学基金资助项目(61364007)~~
【分类号】：TM464;TM912

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