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1.
This paper presents a method to dampen the variations in the output of aggregated wind power through geographic allocation of wind power generation sites. The method, which is based on the sequential optimization of site localization, is applied to the Nordic countries and Germany, using meteorologic wind speed data as the input. The results show that the variability in aggregated wind power output mitigates by applying sequential optimization. For the data used in this work, the coefficient of variation (standard deviation/mean) was 0.54 for the optimized aggregation of sites, as compared with 0.91 for the present day installation. An optimal allocation of wind power generation site reduces the need for dispatch and other measures to deal with the intermittent nature of wind power. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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风电功率预测技术的应用现状及运行建议 总被引：4，自引：2，他引：2
屠强 《电网与水力发电进展》2009,25(10):4-9
针对我国风电开发中遇到的风电接入困难、电网调度困难等问题,对国内外解决此类问题的风电功率预测技术进行了详细的阐述。指出我国急需开发风电功率预测系统,并根据我们的风电功率预测研究经验提出了我国风电功率预测宜采用风电企业和电网共同实施的运行模式。希望对我国的风电功率预测发展起到一定的促进作用。 相似文献
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Variation management strategies improve the capability of the electricity system to meet variations both in the electricity demand and in the generation that relies on variable energy sources. In this work, we introduce a new, functionality‐based, categorization of variation management strategies: shifting (eg, batteries), absorbing (eg, power‐to‐gas), and complementing (dispatchable generation, including reservoir hydropower) strategies. A dispatch model with European coverage (EU‐27 plus Norway and Switzerland) is applied to compare the benefits of shifting and absorbing strategies on wind integration in regions with different amounts of complementing strategies in place. The benefits are measured in terms of the wind value factor, wind owner revenue, and average short‐term generation cost. The results of the modeling show that the reduction in average short‐term generation cost and the increase in revenue earned by the wind owner from shifting strategies, such as the use of batteries, are more substantial at low wind shares than at high wind shares. The opposite situation is found for absorbing strategies, such as power‐to‐gas, which are found to be more efficient at reducing the average generation cost and increasing profit for the wind owner as the wind share increases. In regions that have access to complementing strategies in the form of reservoir hydropower, variation management has a weak ability to reduce the average short‐term generation cost, although it can increase significantly the revenue accrued by the wind power owner. 相似文献
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The growing proportion of wind power in the Nordic power system increases day‐ahead forecasting errors, which have a link to the rising need for balancing power. However, having a large interconnected synchronous power system has its benefits, because it enables to aggregate imbalances from large geographical areas. In this paper, day‐ahead forecast errors from four Nordic countries and the impacts of wind power plant dispersion on forecast errors in areas of different sizes are studied. The forecast accuracy in different regions depends on the amount of the total wind power capacity in the region, how dispersed the capacity is and the forecast model applied. Further, there is a saturation effect involved, after which the reduction in the relative forecast error is not very large anymore. The correlations of day‐ahead forecast errors between areas decline rapidly when the distance increases. All error statistics show a strong decreasing trend up to the area sizes of 50,000 km2. The average mean absolute error (MAE) in different regions is 5.7% of installed capacity. However, MAE of a smaller area can be over 8% of the capacity, but when all the Nordic regions are aggregated together, the capacity‐normalized MAE decreases to 2.5%. The average of the largest errors for different regions is 39.8% and when looking at the largest forecast errors for smaller areas, the largest errors can exceed 80% of the installed capacity, whereas at the Nordic level, the maximum forecast error is only 13.5% of the installed capacity. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Power plant cycling in thermal plants typically implies high costs and emissions. It is, therefore, important to find ways to reduce the influence of variations in wind power generation on these plants without forsaking large amounts of wind power. Using a unit commitment model, this work investigates the possibility to reduce variations by means of a moderator, such as a storage unit or import/export capacity. The relation between the reduction in CO2‐emissions and the power rating of the moderator is investigated, as well as the benefit of a moderator which handles weekly variations compared with a moderator which has to be balanced on a daily basis. It is found that a daily balanced moderator yields a decrease in emissions of about 2% at 20% wind power grid penetration. The reduction in emissions is mainly due to an avoidance of start‐up and part load emissions and a moderator of modest power rating is sufficient to achieve most of this decrease. In the case of a weekly balanced moderator, emissions are reduced as the moderator power rating increases. At 40% wind power grid penetration, a weekly balanced moderator reduces emissions with up to 11%. The major part of this reduction is due to the avoidance of wind power curtailment. The simulated benefit (CO2‐emissions and costs) from adding a general moderator is compared with emissions from Life Cycle Assessment (LCA) studies and cost data of five available moderator technologies; transmission capacity, pumped hydro power, compressed air energy storage, flow batteries and sodium sulphur batteries. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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为能够准确地描述风电功率的波动特性,该文利用勒贝格积分构建简单有效的采样损失率作为衡量风电功率时间序列波动性的指标,采样损失率越大,风电功率波动越剧烈;采样损失率越小,风电功率波动越平缓,并通过风电功率预测结果证实了该指标的有效性。该文还利用该指标对风电场内部平滑效应进行研究,重点研究风速对平滑效应的影响以及平滑效应的季节性。得出结论:风速是影响风电功率平滑效应的重要因素,风速越大,平滑效应越显著。平滑效应具有季节性,春季和冬季的平滑效应较夏季和秋季的平滑效应更显著。 相似文献
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基于调峰能力分析的电网风电接纳能力研究 总被引：4，自引：0，他引：4
风资源作为一种特殊的能源,使得风力发电具有间歇性、随机性等特点。文章以2010年陕西电网调峰裕度分析为基础,分析了陕西电网2010年风电接纳能力,以风资源较为丰富的榆林电网为例,在省网接纳风电能力研究的基础上,结合相关工程电气计算结果,给出了2010年榆林电网风电接纳规模。 相似文献
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2013年我国风电运行消纳形势总体向好,东北地区风电消纳有所改善。提出了风电并网容量与本地消纳能力比例、风电增长速度与本地负荷增长速度比例、风电并网容量与灵活调节电源比例等关键性指标,对2010—2013年东北地区风电运行消纳现状进行客观评估,分析风电弃风的主要原因,展望2014年东北风电运行消纳形势。分析表明,东北地区风电大规模发展与本地消纳能力、与系统调峰能力不匹配是当前弃风的主要原因。加快跨区电网建设、扩大风电消纳范围是解决东北地区风电消纳问题的根本途径。 相似文献
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Hannele Holttinen Peter Meibom Antje Orths Bernhard Lange Mark O'Malley John Olav Tande Ana Estanqueiro Emilio Gomez Lennart Söder Goran Strbac J Charles Smith Frans van Hulle 《风能》2011,14(2):179-192
There are dozens of studies made and ongoing related to wind integration. However, the results are not easy to compare. IEA WIND R&D Task 25 on ‘Design and Operation of Power Systems with Large Amounts of Wind Power’ collects and shares information on wind generation impacts on power systems, with analyses and guidelines on methodologies. In the state‐of‐the‐art report (October, 2007), and the final report of the 3 years period (July, 2009) the most relevant wind power grid integration studies have been analysed especially regarding methodologies and input data. Several issues that impact on the amount of wind power that can be integrated have been identified. Large balancing areas and aggregation benefits of wide areas help in reducing the variability and forecast errors of wind power as well as help in pooling more cost effective balancing resources. System operation and functioning electricity markets at less than day‐ahead time scales help reduce forecast errors of wind power. Transmission is the key to aggregation benefits, electricity markets and larger balancing areas. Best practices in wind integration studies are described. There is also benefit when adding wind power to power systems: it reduces the total operating costs and emissions as wind replaces fossil fuels and this should be highlighted more in future studies. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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To meet the national target of 29% for electricity production from renewable energy sources by 2020 in Greece, effective implementation of massive wind power installed capacity into the power supply system is required. In such a situation, the effective absorption of wind energy production is an important issue in a relatively small and weak power system such as that of Greece, which has limited existing interconnections with neighboring countries. The curtailment of wind power is sometimes necessary in autonomous systems with large wind energy penetration. The absorption or curtailment of wind power is strongly affected by the spatial dispersion of wind power installations. In the present paper, a methodology for estimating this effect is presented and applied for the power supply system of Greece. The method is based on probability theory, and makes use of wind forecasting models to represent the wind energy potential over any candidate area for future wind farm installations in the country. Moreover, technical constraints imposed by the power supply system management, the commitment of power plants and the load dispatch strategies are taken into account to maximize the wind energy penetration levels while ensuring reliable operation of the system. Representative wind power development scenarios are studied and evaluated. Results show that the spatial dispersion of wind power plants contributes beneficially to the wind energy penetration levels that can be accepted by the power system. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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针对并网运行直驱风力发电系统输出有功功率的波动问题,对变换器直流环节并联超导储能系统的控制方式在计及风速模型的基础上做进一步的分析,并对超导储能系统斩波器提出双闭环加脉冲判断的控制策略,确保超导磁体线圈电流水平,使超导储能系统可以快速、准确地吞吐能量,保证直驱风力发电系统在最大限度捕获风能的同时,向电网输送较为平滑的有功功率。对增加超导储能系统的直驱风力发电系统的建模仿真结果,说明了该方法的正确性和有效性。 相似文献
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结合甘肃电网实际研究了风电场接入对系统的影响,分析了网架结构特点和关键断面,采用综合计算程序及最新风机模型通过仿真计算得出了各断面的稳定水平,提出了安全自动装置配置方案,计算及运行验证了风电并入薄弱电网后合理配置全自动装置可以显著提高风电送出能力,同时讨论了风电并网的有关问题,并提出了有益的建议和措施。 相似文献
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\"十一五\"以来我国风电规模快速增长,但风电与电网发展不协调。为更好地推动风电可持续发展及场网协调发展,基于最新数据和研究成果,从风电运行安全、消纳需求、规划建设等角度,分析风电并网对电网带来的影响和原因,从技术发展、电源优化、网架建设、统筹规划等方面,提出解决方案,为电力行业科学健康发展提供参考。 相似文献
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加拿大阿尔伯塔省风能资源丰富,具有开发意向的风电装机容量已相当于其电力系统现有装机规模.大规模的风电并网将给系统运行带来巨大挑战.介绍了AESO针对风电出力变化和不确定性对系统运行的影响及应时措施所作的分析研究;和基于时域仿真的分析方法和模型;以及AESO制定的用于实施、协调各种应对措施的市场及运行框架和实施情况,包括帮助调度人员协调使用各种措施的实时运行决策辅助系统. 相似文献
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为了进行储能容量配置,采用经验模态分解方法,从频域上对储能功率进行划分,并分配给能量型电池和功率型电池,以储能成本最小为约束,以修正系数作为模糊变量,建立模糊机会约束模型,并用于模糊模拟的遗传算法求解。通过仿真算例得出储能电池和超级电容器系统的容量和功率,达到了储能容量配置的要求,采用混合储能系统可以满足平滑风电功率波动的要求,同时充分发挥储能电池和超级电容器的特性,将储能电池和超级电容器的荷电状态控制在合理范围内,保证了储能系统能够稳定运行。 相似文献
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In order to clarify the long‐term variability of the wind in complex terrain, an investigation was conducted on Jeju Island, Korea. The four coastal areas and the three mountainous areas were selected and wind data for 8–11 years from meteorological observatories were collected for this work. Inter‐annual variations, monthly variations and diurnal variations in wind characteristics were calculated from the long‐term wind data. As a result, it was found that wind speed is higher in the winter season while it is lower in the summer season. Wind at all sites blew strongly in the daytime and weakly at night. Also, wind energy and the range of variation in wind energy varied significantly from region to region on Jeju Island. Inter‐annual variations in wind energy on Jeju Island occurred a little greater than seen in the results of earlier works conducted in other place. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献