为增加系统惯性,直流微电网内锂电池控制器常采用虚拟直流发电机(virtual DC generator,VDCG)控制方案,但该方案无法使锂电池荷电状态(state of charge,SOC)自均衡。现有基于VDCG的锂电池SOC均衡方案仅能实现电压等级一致的非等容锂电池...为增加系统惯性,直流微电网内锂电池控制器常采用虚拟直流发电机(virtual DC generator,VDCG)控制方案,但该方案无法使锂电池荷电状态(state of charge,SOC)自均衡。现有基于VDCG的锂电池SOC均衡方案仅能实现电压等级一致的非等容锂电池SOC均衡,而退役锂电池储能系统(retire lithium battery energy storage systems,RLBESS)的容量和电压等级均难以保持一致。针对此问题,提出了一种基于VDCG的适用于不同电压等级及容量的RLBESS组间SOC均衡方案。该方案在传统VDCG的基础上建立U-P_(m)关系式并引入SOC均衡因子,能够根据初始SOC状态自动调节锂电池的功率分配,并保持良好的电压质量。建立了所提方案的小信号模型,分析了关键控制参数对系统稳定性的影响。最后,利用Matlab/Simulink仿真软件对不同工况进行有效性验证。仿真结果表明:所提方案能够在锂电池电压等级不一致工况下实现RLBESS的SOC均衡,具有良好的可扩展性。展开更多
日本作为二战后迅速崛起的国家,非常重视教育,在财经素养教育方面也起步较早。早在1952年,成立储蓄促进中央委员会(the Central Council for Savings Promotion),鼓励人们储蓄,以实现资本积累,支持日本经济复苏。随着日本经济进入高速...日本作为二战后迅速崛起的国家,非常重视教育,在财经素养教育方面也起步较早。早在1952年,成立储蓄促进中央委员会(the Central Council for Savings Promotion),鼓励人们储蓄,以实现资本积累,支持日本经济复苏。随着日本经济进入高速发展期,人们生活水平提升,该组织不仅从个体家庭角度,更从国家的角度,注重财经信息的传播,以促进经济健康发展。展开更多
Effective occupation is a key step for a State to acquire, in accordance with the occupation principle of international law, sovereignty over a territory. In case of a remote, desolate and unlivable territory, the req...Effective occupation is a key step for a State to acquire, in accordance with the occupation principle of international law, sovereignty over a territory. In case of a remote, desolate and unlivable territory, the requirements for effective occupation could be lowered appropriately; it is enough if the occupying State exercises or displays acts of sovereignty appropriate to the circumstances of the territory. The Nansha Islands of China is far away from Chinese mainland, and the natural conditions there are harsh. Ever since ancient times, fishery exploitation has been used by China as one of the most important ways to develop and administrate the Nansha Islands. The fishery history of the Nansha Islands not only demonstrates that China, while exploring and exploiting fishery resources, first discovered the Nansha Islands, but also substantiates that China has exercised jurisdiction over this group of islands appropriate to its circumstances, with a view to managing the local fishing activities. Therefore, China has effectively occupied the Nansha Islands, and enjoys the sovereignty over it.展开更多
文摘为增加系统惯性,直流微电网内锂电池控制器常采用虚拟直流发电机(virtual DC generator,VDCG)控制方案,但该方案无法使锂电池荷电状态(state of charge,SOC)自均衡。现有基于VDCG的锂电池SOC均衡方案仅能实现电压等级一致的非等容锂电池SOC均衡,而退役锂电池储能系统(retire lithium battery energy storage systems,RLBESS)的容量和电压等级均难以保持一致。针对此问题,提出了一种基于VDCG的适用于不同电压等级及容量的RLBESS组间SOC均衡方案。该方案在传统VDCG的基础上建立U-P_(m)关系式并引入SOC均衡因子,能够根据初始SOC状态自动调节锂电池的功率分配,并保持良好的电压质量。建立了所提方案的小信号模型,分析了关键控制参数对系统稳定性的影响。最后,利用Matlab/Simulink仿真软件对不同工况进行有效性验证。仿真结果表明:所提方案能够在锂电池电压等级不一致工况下实现RLBESS的SOC均衡,具有良好的可扩展性。
文摘日本作为二战后迅速崛起的国家,非常重视教育,在财经素养教育方面也起步较早。早在1952年,成立储蓄促进中央委员会(the Central Council for Savings Promotion),鼓励人们储蓄,以实现资本积累,支持日本经济复苏。随着日本经济进入高速发展期,人们生活水平提升,该组织不仅从个体家庭角度,更从国家的角度,注重财经信息的传播,以促进经济健康发展。
文摘Effective occupation is a key step for a State to acquire, in accordance with the occupation principle of international law, sovereignty over a territory. In case of a remote, desolate and unlivable territory, the requirements for effective occupation could be lowered appropriately; it is enough if the occupying State exercises or displays acts of sovereignty appropriate to the circumstances of the territory. The Nansha Islands of China is far away from Chinese mainland, and the natural conditions there are harsh. Ever since ancient times, fishery exploitation has been used by China as one of the most important ways to develop and administrate the Nansha Islands. The fishery history of the Nansha Islands not only demonstrates that China, while exploring and exploiting fishery resources, first discovered the Nansha Islands, but also substantiates that China has exercised jurisdiction over this group of islands appropriate to its circumstances, with a view to managing the local fishing activities. Therefore, China has effectively occupied the Nansha Islands, and enjoys the sovereignty over it.
