直流微网混合储能控制及系统分层协调控制策略

发布时间：2018-04-15 13:06

本文选题：直流微电网 + 混合储能　；参考：《高电压技术》2015年07期

【摘要】：为了充分利用超级电容动态响应快、锂电池能量密度高的特点来提高微网储能系统的动态特性和运行寿命,利用这2种储能器件构成了光伏型直流微网的混合储能系统(HESS)。基于对超级电容和锂电池储能下垂特性的分析和工作区间的划分,提出改进型混合储能控制策略;再根据直流微网系统的功率方程、母线电容储能变化与电压变化方程,导出直流母线电压变化与系统功率流向之间的关系,提出对光伏型直流微网的电压分层协调控制策略。实验结果表明,该策略根据电压变化将直流微网的运行划分为5个层区,通过检测直流母线电压的变化量来决定系统的运行层区及光伏、超级电容和锂电池功率变换器的工作方式,保证各层区都有相应变换器来调整直流母线电压、平衡系统功率,实现直流微网电压稳定的控制目标。因此,基于混合储能系统的电压分层协调控制策略能够有效调节直流母线电压,保证直流微网的功率平衡。
[Abstract]:In order to improve the dynamic characteristics and service life of microgrid energy storage system, the hybrid energy storage system of photovoltaic DC microgrid is constructed by using these two kinds of energy storage devices in order to make full use of the characteristics of quick dynamic response of super capacitor and high energy density of lithium battery.Based on the analysis of the sag characteristics of super capacitor and lithium battery and the partition of working range, an improved hybrid energy storage control strategy is proposed, and then according to the power equation of DC microgrid system, the change equation of bus capacitance energy storage and voltage change,The relationship between DC bus voltage variation and system power flow direction is derived, and a voltage hierarchical coordinated control strategy for photovoltaic DC microgrid is proposed.The experimental results show that the operation of DC microgrid is divided into five layers according to the voltage variation. The operation layer and photovoltaic of the system are determined by detecting the voltage change of DC bus.The operation mode of super capacitor and lithium battery power converter ensures that there are corresponding converters in each layer to adjust the DC bus voltage balance the system power and realize the control goal of DC microgrid voltage stability.Therefore, the voltage hierarchical coordinated control strategy based on hybrid energy storage system can effectively adjust the DC bus voltage and ensure the power balance of DC microgrid.
【作者单位】：太原理工大学电气与动力工程学院;
【基金】：国家自然科学基金(51277127) 山西省煤基重点科技攻关项目(MJ2014-01)~~
【分类号】：TM53;TM912

【共引文献】