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In future power systems with extremely large integration of photovoltaic (PV) generation, it is necessary to not only properly maintain supply–demand balance without power shortfall but also utilize as much PV energy as possible. The application of PV power forecast and energy storage devices to power system operation is necessary. In this study, we propose a method for determining and modifying the charging and discharging schedule of a battery energy storage system (BESS) and the unit commitment of thermal generators based on the PV power forecast. The proposed method is evaluated by numerical simulations for one year. The results show that both the energy shortfall and PV curtailment can be reduced by the proposed method. 相似文献
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Taisei Yoshioka Koji Nishio Kohei Takahashi Taisuke Masuta Rajitha Udawalpola Hideaki Ohtake 《Electrical Engineering in Japan》2023,216(1):e23416
The photovoltaic (PV) power output might be frequently curtailed to maintain electricity supply-demand balance in future power systems. In our previous study, we proposed a new method for updating the battery energy storage system (BESS) charge/discharge and the generator unit commitment (UC) schedules based on the forecasted and actual PV power outputs. The forecast dataset was updated every 3 h (eight times a day). Although the simulation results showed that the proposed method could reduce the supply-demand imbalances, it was not clear whether the forecasted or actual values made contributions. Therefore, in this study, we propose and evaluate a real-time scheduling and operation method using the forecasted and actual PV power outputs assuming that the forecasted dataset is updated only once a day. Numerical simulations of supply-demand operations are conducted on the power system model of the Kanto area of Japan for one year. The results show that the previous study method has a slight advantage over proposed method in terms of curtailed PV energy and operational cost of thermal generators reduction, but the difference is very small, indicating that the contribution of the actual PV power outputs is greater than that of the forecasted PV power outputs. 相似文献
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光伏发电近几年得到快速发展,其出力特性的分析研究逐步深入,但还没有形成成熟的光伏出力评价指标体系。针对这个问题,提出了面向电网运行的光伏出力特性指标体系。通过理论研究和数据测算,发现光伏出力的波动性较风电明显要小、规律性较强,完全可以采用简单、精炼的指标体系来表述。提出采用指标"季节属性"来表征光伏发电在不同季节的可出力时段,指标"平均出力"来表征光伏全天出力整体水平,指标"全日最大出力"来表征光伏出力对系统调节能力的影响。以某实际光伏电站出力为例,分析了所提评价体系的具体指标和分类结果。计算结果说明了通过核心指标体系,可以直观描述光伏出力特性,并有助于形成典型出力曲线,具有很好的应用前景。 相似文献
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由于光伏出力的不稳定性,在包含高比例光伏出力的区域,需要配置储能设备才能实现能源供需平衡.为实现长期经济效益最大化,应分析含高比例光伏出力区域的分布式储能优化方法,设计分布式储能的选址和容量分配方案.首先,针对光伏出力的间歇性,从电量出发,利用改进的快速排序算法建立了特征光伏曲线的选择算法.其次,利用FCM模糊聚类算法... 相似文献
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为了提高光伏储能系统安全性与实用性,以LabVIEW 2012为软件开发平台,以RS232串口为数据传输通道,开发设计了光伏储能控制系统,阐述了其设计思路与主要功能。通过连续运行测试证明:该系统可以完成控制切换光伏储能系统工作模式、采集监测系统信息、实时显示保存数据信息等功能。光伏储能系统通过控制可以进行光伏能量和存储能量调度,提高了光伏能量利用率,保障了蓄电池使用安全性,表明此控制系统具有可靠性、准确性、安全性和经济性等优点。 相似文献
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为了改善系统的性能太阳能燃料电池分布式能源系统,针对光伏阵列与SPE电解槽进行了直接优化连接。基于光伏阵列的特性的理论分析,给出了光伏阵列的特性方程式和光伏阵列I-V特性曲线工程计算法,探究光伏阵列-SPE电解槽直接优化连接的运行效果,结果表明通过将SPE电解槽和光伏阵列的组成形式设计优化至最合理,从而让SPE电解槽的输入的伏安特性和光伏阵列输出的伏安特性达到最相匹配,进而可以有效地提升光伏阵列-SPE电解槽直接连接方式下的运行效率。 相似文献
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光伏模块的发电效率会受到各种因素的影响,其中温度是重要影响因素之一。温度对光伏模块发电效率的影响分析是基于二者之间的线性回归模型进行的,现有研究中通常只考虑辐照、风速、安装结构与位置等因素对模块温度的影响,忽视了晴天持续的高辐照使光伏模块持续工作在高发电状态,产生的热量积累使得模块温度随时间推移而上升的情况。文章通过分析屋顶光伏电厂实测数据,验证了晴天热量积累造成模块温度随时间推移而升高,会对发电效率造成负面影响,雨天的雨水起到为电池板降温的作用,发电效率受到的影响较小;在此基础上,在典型发电效率的多元线性模型中加入时间作为另一个因子,构造更准确的不同天气类型的发电效率模型。 相似文献
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高渗透光储并网发电系统功率振荡将因缺乏阻尼能力而威胁系统的动态稳定。首先分析通过调节光储系统的有功、无功增加系统阻尼的原理,并在光储联合系统并网功率控制的基础上,提出光储系统基于有功、无功控制的附加阻尼控制策略。该控制策略通过检测光伏侧直流电压变化,实现功率振荡过程中光伏并网逆变器和蓄电池储能系统的控制模式切换,使联合系统具备持续调节注入系统有功、无功功率的能力,并改善电网的阻尼特性。最后,基于渗透率约为30%的光储并网发电仿真系统,验证在系统出现振荡后,光储系统在所提控制策略下,具备通过快速功率调节抑制功率振荡的能力,从而实现多电源协调改善发电系统阻尼的控制目标。 相似文献
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本文通过研究由光伏阵列、蓄电池组及其管理系统、光伏变流器、负载及电网共同组成的光蓄互补发电系统,根据蓄电池的特性和现在开关器件控制技术的发展,针对蓄电池的充/放电控制策略进行了研究,三相逆变器采用基于空间矢量脉宽调制(SVPWM)的空间矢量控制方式,在介绍了SVPWM的基本原理及合成方法后,对并网和离网两种系统工作模式的控制策略进行了研究,最后控制理论研制了光蓄互补发电系统用变流器,并搭建试验平台对系统进行试验测试,验证了控制策略的正确性。 相似文献
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Fumiya Hyodo Yuki Sato Taisuke Masuta Thavatchai Tayjasanant 《Electrical Engineering in Japan》2023,216(1):e23419
In recent years, the aggregation business has gained a lot of attention in Japan. Aggregators will make contracts with customers with photovoltaic (PV) power systems and battery energy storage systems (BESSs) including electric vehicles (EVs) to participate in electricity markets. Aggregators might have to pay electricity supply-demand imbalance charges when generated and consumed energies contracted at the day-ahead supply-demand market are different from those at the current day operation due to distribution network constraints such as voltage and power flow limitations. Therefore, the information on network constraints is very important for aggregators to determine their day-ahead schedules. In this paper, we evaluated the relationship between aggregator supply-demand schedules and the distribution system operation. It was assumed that the reverse power flow limitations due to network constraints are notified to the aggregators by distribution system operator (DSO). Two cases of the aggregators’ schedules of PV systems and stationary BESSs were compared in the simulations. In addition, aggregator strategies for making adequate schedules were evaluated. 相似文献