CN112036663A - 一种高寒山区风电场风能资源评估方法 - Google Patents
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Abstract
一种高寒山区风电场风能资源评估方法,步骤为:首先判断是否为重冰区,不是重冰区则按常规方法进行数据观测,是重冰区则还需在冬季采用激光雷达辅助观测;当数据观测到测风塔全年覆冰时长大于10%时,在冬季采用激光雷达辅助观测;数据观测到测风塔全年覆冰时长不大于10%,则继续观测;分别计算测风塔原始数据和根据辅助测风记录插补后的数据的发电量,并结合除冰系统成本进行技术经济对比;当差额内部收益率大于基准收益率时,推荐拟建风电场用除冰措施;用雷击传感器对风电场区域雷击次数进行观测;当区域雷击次数大于60次时,用热空气除冰方法;否则用电热除冰方法。本发明解决了当前高寒山区风电场设计中无法准确地评估风能资源的技术难题。
Description
技术领域
本发明属于风力发电场工程设计技术领域,具体涉及一种高寒山区风电场风能资源评估方法。
背景技术
风能资源是可再生清洁能源,风力发电是新能源领域中技术最为成熟、最具规模开发条件和商业化发展前景的发电方式之一,目前已在全球大规模开发利用。近年来,我国风电产业快速发展,装机量已居世界第一,后续风电产业发展力度还将进一步加大。
我国风能资源主要集中在气候寒冷的三北(东北、西北、华北)地区和湿度较大的东南沿海地区,其中云贵、两广、两湖、江浙等地区为我国风电发展较快的地区。作为风电开发的先遣队,测风塔通常工作在野外,要面临大风、暴雨、辐射、低温、结冰以及雷击等恶劣气象条件。测风塔在测风过程中,往往由于仪器损坏、数据传输故障、结冰等原因,部分传感器数据出现缺失或异常。在重冰区工作的测风塔往往由于冰冻的影响导致测风塔风速和风向通道长时间不同程度的测量偏差,严重的甚至引发倒塔事故,为后续风电场的开发建设带来很大的困难。
目前业界对覆冰的研究大多集中于风电机组叶片覆冰机理与风电机组的防除冰技术,而针对高寒山区风电场资源评估以及是否使用除冰措施、使用什么样的除冰措施的研究相对较少,一来是因为测风塔市场体量和投资占比较小,二来是受新能源开发前期工作短平快的开发模式所制约。目前对高寒山区风电场风能资源评估方法的研究,大多仍处于探索阶段。申请号201611105069.6的中国专利公开了一种应用于测风装置的除冰系统,采用微波对测风装置进行加热,以较好的去除测风装置上的冰雪,保证了测量到的风速风向的准确性,但是该方法并未涉及风电场除冰系统的使用分析。
发明内容
基于上述现有技术的问题,本发明提供了一种高寒山区风电场风能资源评估方法。
本发明是通过如下技术方案来实现的:
一种高寒山区风电场风能资源评估方法,步骤如下:
1)判断项目区域是否为重冰区。不是重冰区则按常规方法进行数据观测;是重冰区则还需在冬季采用激光雷达辅助观测措施,为风能资源评估提供输入资料;
2)当常规数据观测到测风塔全年覆冰时长大于10%时,在冬季采用激光雷达辅助观测措施;数据观测到测风塔全年覆冰时长不大于10%,则继续观测,直至收集满年数据;
3)分别计算测风塔原始数据和根据辅助测风记录插补后的数据对应的发电量,并结合除冰系统的成本进行技术经济对比;
4)当差额内部收益率(ΔIRR)大于基准收益率(IRRC)时,则推荐拟建风电场运维过程中采用除冰措施;
5)数据观测的同时,还使用雷击传感器对风电场区域雷击次数进行观测;
6)当区域雷击次数大于60次时,采用热空气除冰方法;否则采用电热除冰方法。
较佳地,当用除冰措施时,采用经辅助测风记录插补完成的修正数据计算发电量;当不用除冰措施时,则采用原始测风数据计算发电量。
当前较成熟的叶片除冰主要有叶片内热空气除冰和叶片表面电加热除冰两种技术路线。但两种技术均有各自的缺点和不足,热空气除冰有引发热应力造成叶片主体开裂和加速树脂的老化的风险,表面电加热除冰因表面电加热膜的使用在夏季增加了机组被雷击而停机的风险。本发明中采用雷击传感器对风电场区域雷击次数进行观测,当区域雷击次数大于60次时,采用热空气除冰方法,否则采用电热除冰方法。
本发明在风能资源评估时,综合考虑高寒山区风电场覆冰和雷暴特点,不仅使得风能资源评估更贴近真实,还能为风电场除冰措施的选择和使用提供决策依据,使高寒山区风电场的投资决策更加科学合理。
附图说明
图1为某高寒山区风电场某典型测风塔各高度风速通道覆冰示意图;
图2为本发明的流程图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图对本发明进行进一步详细说明。本领域技术人员将会理解,下列实施例仅用于说明本发明,而不应视为限定本发明的范围。实施例中未注明具体技术、连接关系或条件者,按照本领域内的文献所描述的技术、连接关系、条件或者按照产品说明书进行。所用材料、仪器或设备未注明生产厂商者,均为可以通过购买获得的常规产品。
下面结合附图对本发明作进一步说明。
如图1所示,为某高寒山区风电场案例中某典型测风塔90m测风高度风速通道覆冰示意图。图中该高度层风速传感器在12月份发生间歇性冰冻,记录数值明显低于实际值,实测数据并非真实值。覆冰是由过冷却水滴碰到了温度低于冰点的物体上形成的,其生成和生长是集空气动力学、流体力学、热力学等的综合物理过程,通常当气温<5℃即可能发生。高寒山区中设置的测风塔在冬季往往面临着严重的覆冰问题,在个别地区,覆冰往往长达数周之久,给该地区风能资源的准确评估带来很大困难。
本实施例中,拟开展测风工作的风电场位于重冰区,在开展测风工作时,便在冬季(通常是11月~来年4月)采用激光雷达辅助观测措施来收集更多、更真实的风况资料。激光雷达的使用,给覆冰期间风速数据的插补处理提供了数据基础。风速插补均依据《风电场气象观测及资料审核订正技术规范》,求解形如y=ax+b的一元一次回归方程。图1还示出了该典型覆冰时段采用激光雷达数据插补前后风速数据曲线对比。详细统计数据见下表。该测风塔90m高度实测年平均风速为6.01m/s,经激光雷达数据插补后,年平均风速为6.46m/s,增加0.44m/s(见表一)。
表一
月份 | 插补前 | 插补后 | 相差 |
1 | 6.41 | 7.63 | 1.22 |
2 | 8.52 | 9.23 | 0.71 |
3 | 8.03 | 8.48 | 0.46 |
4 | 6.78 | 6.79 | 0.01 |
5 | 5.94 | 5.94 | 0.00 |
6 | 4.62 | 4.62 | 0.00 |
7 | 3.98 | 3.98 | 0.00 |
8 | 4.96 | 4.96 | 0.00 |
9 | 5.90 | 5.90 | 0.00 |
10 | 6.10 | 6.10 | 0.00 |
11 | 5.85 | 6.62 | 0.77 |
12 | 5.07 | 7.25 | 2.18 |
年平均 | 6.01 | 6.46 | 0.44 |
风电机组叶片的覆冰会影响叶片的空气动力学轮廓,引起风电机组的附加载荷与额外振动,降低叶片及机组的使用寿命,导致机组故障,影响风力发电场的发电量,早期的风电机组当发生覆冰时只能选择停机,降低了资源利用率。多年来,业界在叶片除冰系统方面的积极研究和探索为风电机组覆冰问题提供了解决方案,使得风电机组在冬季也能正常发电。本实施例中对测风塔原始数据和根据辅助测风记录插补后的数据分别计算发电量,结合除冰系统的成本进行技术经济对比。当差额内部收益率(ΔIRR)大于基准收益率(IRRC)时,则推荐拟建风电场运维过程中采用除冰措施。
以该风电场为例,采用除冰系统的技术经济对比见表二。采用基于计算流体力学方案(CFD)的WT风能计算软件对风电场上网电量进行计算。由表二可知,采用除冰系统时,两个方案的差额内部收益率ΔIRR为21.66%,大于行业基准内部收益率8%。该风电场采用除冰系统较为适宜。
表二
序号 | 项目 | 单位 | 不采用除冰系统 | 采用除冰系统 |
1 | 单机容量 | MW | 2.5 | 2.5 |
2 | 机位数量 | 台 | 40 | 40 |
3 | 总装机容量 | MW | 100 | 100 |
4 | 测风塔年平均风速 | m/s | 6.01 | 6.46 |
5 | 全场年利用小时数 | hr | 2215.7 | 2408.7 |
6 | 年上网电量 | 万kWh | 22156.8 | 24087.2 |
7 | 估算静态投资 | 万元 | 75604.8 | 77004.8 |
8 | 单位千瓦静态投资 | 元/kW | 7560.48 | 7700.48 |
9 | 上网电价 | 元/kWh | 0.42 | 0.42 |
10 | 资本金财务内部收益率 | % | 10.97 | 13.94 |
11 | 差额内部收益率ΔIRR | % | 基准 | 21.66 |
数据观测的同时,还采用雷击传感器对风电场区域雷击次数进行观测,当区域雷击次数大于60次时,采用热空气除冰方法,否则采用电热除冰方法。当采用除冰措施时,采用经辅助测风记录插补完成的修正数据计算发电量;当不采用除冰措施时,则采用原始测风数据计算发电量。
雷击传感器的测量结果显示,该风电场年雷击次数达84次,主要发生在夏季。当采用叶片表面电加热除冰技术时,容易加剧风电机组被雷击导致停机的风险,故而选用叶片内热空气除冰技术。
本领域的技术人员容易理解,以上所述的实施方式仅为示例性的而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (2)
1.一种高寒山区风电场风能资源评估方法,其特征在于,步骤如下:
1)判断项目区域是否为重冰区,不是重冰区则按常规方法进行数据观测;是重冰区则还需在冬季采用激光雷达辅助观测措施,为风能资源评估提供输入资料;
2)当数据观测到测风塔全年覆冰时长大于10%时,在冬季采用激光雷达辅助观测措施;数据观测到测风塔全年覆冰时长不大于10%,则继续观测,收集满年数据;
3)分别计算测风塔原始数据和根据辅助测风记录插补后的数据对应的发电量,并结合除冰系统的成本进行技术经济对比;
4)当差额内部收益率大于基准收益率时,则推荐拟建风电场运维过程中采用除冰措施;
5)数据观测的同时,还使用雷击传感器对风电场区域雷击次数进行观测;
6)当区域雷击次数大于60次时,采用热空气除冰方法;否则采用电热除冰方法。
2.根据权利要求1所述的一种高寒山区风电场风能资源评估方法,其特征在于,当用除冰措施时,采用经辅助测风记录插补完成的修正数据计算发电量;当不用除冰措施时,则采用原始测风数据计算发电量。
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