Smoothing effects of distributed wind turbines. Part 2. Coherence among power output of distant wind turbines
Smoothing effects of distributed wind turbines. Part 2. Coherence among power output of distant wind turbines
复制标题
分布式风力涡轮机的平滑效应。
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Masaaki Shibata
中科院分区：
文献类型：
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作者：
T. Nanahara;M. Asari;T. Maejima;Takamitsu Sato;Koji Yamaguchi;Masaaki Shibata
最近风力发电有了显著的增长。从电力系统的角度来看，由于风力涡轮机是具有大的输出波动的间歇性发电机，因此风力涡轮机的数量的任何增加都会引起对风力涡轮机对电力质量的不利影响的担忧。风力涡轮机输出波动的平滑效果在评估大量风力涡轮机的影响时是非常重要的。关于对电力系统频率的影响（发电-需求平衡），需要更详细地研究电力系统范围内的平滑效应，因为风力涡轮机对电力系统频率的影响主要取决于与系统互连的风力涡轮机的总功率输出。本文研究了风电输出在电力系统范围内的平滑效应。首先，总结了风测量，在16个站点进行了观测。其次，分析了远程风力涡轮机的风力输出的相关系数;从一天到一天的相关系数中观察到相当大的差异。然后引入了一个新的平滑效果评价指标--平均相干度，以解决相干度等传统指标难以评价平滑效果的问题。对测量数据的平均相干性进行了评估;结果表明，分布在数百公里范围内的风电场之间的平滑效应在超过约100分钟的时间内可能不那么显著。版权所有© 2004 John Wiley & Sons，Ltd.
Recently there has been a marked increase in wind power generation. From a power system point of view, because a wind turbine is an intermittent generator with large output fluctuation, any increase in the number of wind turbines gives rise to concerns about the adverse effects of wind turbines on power quality. The smoothing effects of wind turbine output fluctuation are of great importance in assessing the impacts of a large number of wind turbines. With regard to impacts on power system frequency (generation‐demand balance), smoothing effects on a power system-wide scale need to be examined in greater detail, because impacts of wind turbines on power system frequency are dominated by the total power output of wind turbines interconnected to the system. This article examines smoothing effects of wind power output on a power system-wide scale. First a summary of wind measurements, in which observations were made at 16 sites, is presented. Next, correlation coefficients of wind power output of distant wind turbines are analysed; considerable differences are observed in the correlation coefficients from day to day. Then a new indicator for assessing the smoothing effects—average coherence—is introduced to resolve difficulties of conventional indicators such as coherence. Average coherence is evaluated for the measured data; the results show that smoothing effects among wind farms distributed over some hundreds of kilometres may not be so significant for periods of more than about 100 min. Copyright © 2004 John Wiley & Sons, Ltd.