학술논문
基于机舱风速数据的风电场弃风电量计算方法研究 / Study on Energy Loss Calculation During Wind Power Curtailment Based on Wind Speed Measured by Turbine Nacelle Anemometers
Document Type
Academic Journal
Author
姜文玲; 冯双磊; 孙勇; 王勃; 汪宁渤; 郭凌旭; JIANG Wenling; FENG Shuanglei; SUN Yong; WANG Bo; WANG Ningbo; GUO Lingxu
Source
电网技术 / Power System Technology. (3):647-652
Subject
Language
Chinese
ISSN
1000-3673
Abstract
为准确评估风电场弃风时段的电量损失，提出了一种新的风电场理论功率与弃风电量计算方法-机舱风速法。该方法基于风电机组正常运行时段的输出功率与机舱风速计的测量风速建立映射关系，再应用到弃风时段，计算风电场的理论功率与弃风电量。为研究该方法的可靠性，分析了仪器测量偏差、风机尾流波动性、开停机状态对理论功率计算结果的影响，并给出了开、停机状态下机舱测量风速的换算方法。采用风电场实测数据对机舱风速法进行了验证，验证结果显示机舱风速法计算的理论功率的相关性系数平均为0.9960，均方根误差平均为1.87%，理论电量误差平均为0.68%。与已有方法相比，机舱风速法计算精度高，便于区分电量损失来源，能针对不同开机方案进行灵活设置。机舱风速法不需要建立测风塔，但如能引入测风塔数据修正机舱风速，有可能进一步提升计算精度。
To accurately assess the energy loss of wind farm during wind power curtailment, a new method to calculate theoretical power of wind farm and energy loss due to wind power curtailment, which is called nacelle wind speed method, is proposed. A mapping relation based on output power of wind power generating unit under normal operation and the wind speed measured by turbine nacelle anemometers is established, and using the established relation to the time-interval of wind power curtailment, the theoretical power of wind farm and the energy loss due to wind power curtailment are calculated. To research the reliability of the proposed method, the impacts of measured deviation of instruments, the fluctuation of the turbine’s wake and the operating status of turbines on calculation result of theoretical power are analyzed, and a conversion method of wind speed measured in turbine nacelles under the conditions of being operated and being shut down of wind turbines is given. The wind power speed data measured in wind farm is used to validate the correctness of the proposed nacelle wind speed method, and validation results show that the average correlation coefficient of theoretical power calculated by the proposed nacelle wind speed method is 0.9660, the average root-mean-square error is 1.87%, the average error of calculated theoretical power is 0.68%. Using the proposed nacelle wind speed method, higher calculation accuracy can be attained than existing methods, and it is convenient for distinguishing the reasons of energy loss and can be flexibly set under various operating modes of wind turbine. It is not needed to built anemometer tower for nacelle wind speed method, however the calculation accuracy could be further improved when the wind speed measured by nacelle anemometer can be modified by the inducted anemometer tower data.
To accurately assess the energy loss of wind farm during wind power curtailment, a new method to calculate theoretical power of wind farm and energy loss due to wind power curtailment, which is called nacelle wind speed method, is proposed. A mapping relation based on output power of wind power generating unit under normal operation and the wind speed measured by turbine nacelle anemometers is established, and using the established relation to the time-interval of wind power curtailment, the theoretical power of wind farm and the energy loss due to wind power curtailment are calculated. To research the reliability of the proposed method, the impacts of measured deviation of instruments, the fluctuation of the turbine’s wake and the operating status of turbines on calculation result of theoretical power are analyzed, and a conversion method of wind speed measured in turbine nacelles under the conditions of being operated and being shut down of wind turbines is given. The wind power speed data measured in wind farm is used to validate the correctness of the proposed nacelle wind speed method, and validation results show that the average correlation coefficient of theoretical power calculated by the proposed nacelle wind speed method is 0.9660, the average root-mean-square error is 1.87%, the average error of calculated theoretical power is 0.68%. Using the proposed nacelle wind speed method, higher calculation accuracy can be attained than existing methods, and it is convenient for distinguishing the reasons of energy loss and can be flexibly set under various operating modes of wind turbine. It is not needed to built anemometer tower for nacelle wind speed method, however the calculation accuracy could be further improved when the wind speed measured by nacelle anemometer can be modified by the inducted anemometer tower data.