共查询到19条相似文献,搜索用时 203 毫秒
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为了保证光伏发电系统供电的可靠性及稳定性,为了提高光伏发电系统中蓄电池的运行效率和工作寿命,提出一种基于直流母线电压变化的蓄电池充放电控制策略。控制策略以直流母线电压瞬时值作为输入变量,蓄电池的充放电状态作为输出变量。在确保外界因素发生变化时,光伏发电系统仍能为负载提供稳定可靠电能的同时,避免蓄电池在工作模式之间发生误切换和频繁切换对系统造成的影响。在Matlab/Simulink环境中,搭建了基于双向DC/DC变换器的蓄电池充放电仿真电路,并搭建光储并联供电仿真模型,在不同条件下进行了仿真验证,仿真结果验证了充放电控制策略的有效性。 相似文献
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对一种以微控制器—ATmega48为核心的光伏充放电控制器进行了研究。该充放电控制器用于光伏发电系统中,是一种控制太阳能电池阵列对蓄电池充电以及蓄电池对负载放电两个过程的自动控制设备。阐述了光伏系统的充放电过程,设计了充放电和电压检测等电路。实验表明:控制器能够根据蓄电池的当前状态,优化充电过程,对蓄电池的寿命能起到很好的保护作用。 相似文献
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独立光伏系统中超级电容器蓄电池有源混合储能方案的研究 总被引:9,自引:1,他引:9
超级电容器与蓄电池混合使用,可以充分发挥蓄电池能量密度大和超级电容器功率密度大、循环寿命长的优点,大大提升储能系统的性能.针对独立光伏系统的特点,设计了一种有源式混合储能方案,建立了系统的模型和控制环节.实验结果表明,在光伏发电功率和负载功率脉动时,蓄电池能够工作在优化的充放电状态,并能够有效地减少充放电小循环次数.对解决光伏等可再生能源系统中的储能问题,具有现实可行性. 相似文献
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It is estimated that about 80% of all photovoltaic (PV) modules are used in stand-alone applications. Continuous power is obtained from PV systems by using a storage buffer, typically in the form of a lead acid battery. Batteries used in PV applications have different performance characteristics compared with batteries used in more traditional applications. In PV applications, lead acid batteries do not reach the cycle of lead acid batteries used in other applications such as uninterruptible power supplies or electric vehicles. The shortened battery life contributes significantly to the costs of a PV system. In some PV systems the battery accounts for more than 40% of the life cycle costs. An increase in the lifetime of the battery will result in improved reliability of the system and a significant reduction in operating costs. The life of a lead acid battery can be extended by avoiding critical operating conditions such as overcharge and deep discharge. This paper presents a battery management system for such applications 相似文献
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针对由电池和超级电容器构成的混合储能系统,设计了一种平抑光伏出力波动的储能控制策略。基于含阀值判断的低通滤波算法制定储能系统总充放电功率,在平抑光伏出力波动的同时避免对储能系统的过渡调控。综合考虑储能介质充放电状态,基于滑动平均原理制定储能介质的功率分配策略,以充分发挥不同储能介质的优势,优化储能系统的整体运行性能。仿真分析验证了所设计控制策略的有效性,储能系统可以较小的调控代价完成对光伏出力波动的平抑,且超级电容器平抑功率波动的快变分量,有效降低了储能电池的充放电次数。研究结果对混合储能系统在平抑光伏出力波动中的应用提供了理论参考。 相似文献
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电动汽车用先进电池的现状及发展 总被引:11,自引:1,他引:10
详细论述了世界范围内电动汽车产业的发展及电动车用先进电池的现状及发展前景。特别介绍了美国、日本、欧洲及亚太地区电动车业及所用电池的发展现状。并主要介绍了MH/Ni电池和锂离子电池的进展 ,尤其是这两种电池应用于电动车的进展情况 相似文献
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间歇性和随机波动性的分布式新能源大规模接入,储能系统与电动汽车的随机充放电以及智能量测装置的量测误差等使得主动配电系统的态势感知面临诸多挑战。考虑到光照强度、温度及电池荷电状态等影响因素,文中搭建了含光伏发电电源、配电网和蓄电池储能负荷的主动配电系统状态估计模型。首先,基于光伏五参数模型和电池内阻模型,推导出光伏系统和蓄电池储能系统的量测函数及雅可比矩阵。然后,结合配电网的状态估计模型,将电气量和非电气量统一标幺化后,对主动配电系统进行状态估计及不良数据处理。最后,在IEEE 33节点系统下进行了仿真验证。仿真结果表明,与光伏系统和蓄电池储能系统作为PQ节点的模型相比,所提方法扩展了与光伏系统和蓄电池储能系统相关的状态估计和不良数据处理能力,且提高了配电网的状态估计精度。 相似文献
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HEV用MH/Ni电池的贮存性能 总被引:1,自引:1,他引:0
在HEV用MH/Ni电池的设计中,研究了添加Ni粉、Co粉及提高CoO的加入量对MH/Ni电池贮存性能的影响,结果表明:正极中加入较多的Ni粉或提高CoO的加入量均能够提高MH/Ni电池的贮存性能.正极中Ni粉的加入量从0%提高到10%和20%时,MH/Ni电池贮存后的容量衰减率分别降低了3.9%和6.6%;正极中CoO的加入量由5%提高到15%,MH/Ni电池贮存后的容量衰减率降低了4.9%.采用Co粉作添加剂时,在一定程度上修复了遭受破坏的CoOOH导电网络,改善了MH/Ni电池初期的贮存性能. 相似文献
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Microgrids include distributed energy resources, controllable loads, and storage devices, and they can be classified into AC and DC types, depending on the characteristics of the supply voltage. In this paper, an optimal control strategy for a DC microgrid is proposed, and the strategy is aimed at minimizing the daily total energy costs. The DC micro grid can include non-dispatchable generation units (such as photovoltaic power generation) and dispatchable generation units, energy storage systems (batteries), and controllable/not controllable loads. The control strategy is based on a two-step procedure, i.e., (1) the implementation of one day-ahead scheduling and (2) a very short-time predictive control. The day-ahead scheduling is formulated using integer linear programming methodology and is aimed at achieving the optimal scheduling of controllable loads. The very short-time predictive control is based on the solution of a non-linear, multi-period, optimization problem and is aimed at achieving the real-time optimal charging/discharging profile of storage powers and the real-time optimal profile of powers of dispatchable generators thereby minimizing the cost of total daily energy. For both procedures, optimization models were formulated and solved, including technical constraints that guaranteed an adequate lifetime of the storage system. Case studies relative to a DC microgrid obtained by a modification of the actual structure of the electrical power plant of an Italian industrial facility were investigated in order to show the feasibility and the effectiveness of the proposed approach. 相似文献
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