基于功率池的双层母线直流微电网协调控制策略

发布时间：2018-08-15 19:22

【摘要】：为便于不同电压等级的直流微源、负荷接入直流微电网,设计了一种基于功率池的双层母线直流微电网,并提出了其协调控制策略。该微电网由2个电压等级不同的独立直流微电网通过功率池连接构成。设置锂电池作为功率池的能量后备,二者以级联结构构成微网储能调压系统。详细设计了两直流子网与功率池之间、锂电池组与功率池之间的功率交换机制,稳定直流母线电压,使两子网互为备用,同时实现两直流子网、锂电池三者间低频功率交换,避免了两子网间高频功率波动的相互影响,并延长了锂电池的使用寿命。设计锂电池荷电状态调节机制,母线电压稳定时由直流子网对其进行调节,提高了微网持续运行能力。最后,通过实验验证了所提出控制策略的有效性和可行性。
[Abstract]:In order to facilitate DC microsource with different voltage levels, a double-layer busbar DC microgrid based on power cell is designed and its coordinated control strategy is proposed. The microgrid consists of two independent DC microgrids with different voltage levels connected by power cells. The lithium battery is used as the energy reserve of the power cell, and the microgrid energy storage and regulating system is composed of cascaded structure. The power exchange mechanism between two DC subnet and power cell, lithium battery pack and power cell is designed in detail. The DC bus voltage is stabilized and the two subnets are used as backup. At the same time, the low frequency power exchange between the two DC subnets and the lithium battery is realized. The interaction of high frequency power fluctuation between the two subnets is avoided, and the service life of lithium battery is prolonged. The charging state adjustment mechanism of lithium battery is designed, which is regulated by DC subnet when the bus voltage is stable, which improves the continuous operation ability of the microgrid. Finally, the effectiveness and feasibility of the proposed control strategy are verified by experiments.
【作者单位】：电力系统运行与控制山西省重点实验室(太原理工大学);
【基金】：山西省煤基重点科技攻关项目(MD2014-06) 山西省回国留学人员科研资助项目(2015-重点1)~~
【分类号】：TM727

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