A Battery/Ultracapacitor Hybrid Energy Storage System for Implementing the Power Management of Virtual Synchronous Generators
A Battery/Ultracapacitor Hybrid Energy Storage System for Implementing the Power Management of Virtual Synchronous Generators
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DOI：
10.1109/tpel.2017.2759256
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发表时间：
2018-04
影响因子：
6.7
通讯作者：
Jingyang Fang;Yi Tang;Hongchang Li;Xiaoqiang Li
中科院分区：
文献类型：
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作者：
Jingyang Fang;Yi Tang;Hongchang Li;Xiaoqiang Li
可再生能源（RESs）已被广泛地集成到现代电力系统中，以满足全球日益增长的能源需求，并减少温室气体排放。因此，以前由同步发电机提供的频率调节任务逐渐由功率转换器接管，功率转换器作为电网和RES之间的接口。通过将功率转换器调节为虚拟同步发电机（VSG），它们可以表现出相似的频率动态响应。然而，与同步发电机不同，功率转换器不能吸收/输送任何动能，这需要额外的储能系统（ESS）。然而，在VSG的ESS的实施和协调控制没有被以前的研究调查。为了填补这一研究空白，这封信提出了一个混合ESS（HESS）组成的电池和超级电容器，以实现电源管理的VSG。通过适当的控制，超级电容器自动解决惯性仿真引入的快速变化的功率，而电池实现VSG的其余部分，并且仅补偿相对长期的功率波动和缓慢的动态。通过这种方式，所提出的HESS允许沿着减少电池功率波动及其变化率。最后，实验结果来验证所提出的概念。
Renewable energy sources (RESs) have been extensively integrated into modern power systems to meet the increasing worldwide energy demand as well as reduce greenhouse gas emission. As a result, the task of frequency regulation previously provided by synchronous generators is gradually taken over by power converters, which serve as the interface between the power grid and RESs. By regulating power converters as virtual synchronous generators (VSGs), they can exhibit similar frequency dynamic response. However, unlike synchronous generators, power converters are incapable of absorbing/delivering any kinetic energy, which necessitates extra energy storage systems (ESSs). Nonetheless, the implementation and coordination control of ESSs in VSGs have not been investigated by previous research. To fill this research gap, this letter proposes a hybrid ESS (HESS) consisting of a battery and an ultracapacitor to achieve the power management of VSGs. Through proper control, the ultracapacitor automatically tackles the fast-varying power introduced by inertia emulation while the battery implements the remaining parts of a VSG and only compensates for relatively long-term power fluctuations with slow dynamics. In this way, the proposed HESS allows reduction of the battery power fluctuations along with its changing rate. Finally, experimental results are presented to validate the proposed concept.