直流微网系统中混合储能分频协调控制策略  

Frequency Dividing Coordinated Control Strategy for Hybrid Energy Storage System of DC Micro-Grid

作　　者：李武华[1] 徐驰[1] 禹红斌[1] 顾云杰[1] 胡斯登[1] 何湘宁[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2016年第14期84-92,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51407159);浙江省自然科学基金(LR16E070001)资助项目

摘　　要：针对直流微网架构的特点,设计了一种分频段响应的控制策略。通过母线电压的反馈来提取功率波动,利用直流母线电压环和超级电容电压环设置高通滤波器、带通滤波器和低通滤波器这三个"隐形"滤波器。其中母线功率波动的高中低频分量依次由母线电容、超级电容和蓄电池响应,从而充分利用了蓄电池能量密度大和超级电容功率密度大、循环使用寿命长的优点,有效提升了储能系统的性能。而且,隐形滤波器的实现完全由软件控制完成,具有很好的灵活性和适应性,且无需增加额外的硬件成本。最后,通过实验验证了所提出的混合储能控制策略的有效性。The renewable energy in DC micro-gird system, such as wind and solar power, has the features of unpredictable power and intermittent outputs. To enhance the stability and reliability, it is necessary to combine energy storage components. The storage unit is made up of hybrid energy which consists of super capacitors and batteries. In this paper, a frequency dividing coordinated control strategy is introduced, which is suitable for DC micro-grid. The information of the power fluctuation can be extracted from the DC bus voltage, and then the invisible filters, namely a low-pass filter, a band-pass filter and a high-pass filter, are formed through the DC bus voltage loop and super capacitor voltage loop. The high, medium and low frequency power fluctuations are absorbed by the bus capacitor, the super capacitor and the battery respectively so as to fully exploit the advantages of battery and super capacitor, such as the high energy density of batteries, the high power density and long cycling life of super capacitor. Hence the storage performance is enhanced. Moreover, without adding extra hardware, the invisible filters are fulfilled by software which is flexible and adjustable. Finally, the experimental results verify the effectiveness of the proposed hybrid energy storage control strategy.

关 键 词：直流微网 混合储能 分频协调控制 

分 类 号：TM727[电气工程—电力系统及自动化] TM764.2