| 引用本文: | 乔 辉,韩璟琳,李 征,等.采用日累计发电量重构光伏出力曲线的线损精确计算方法[J].电力系统保护与控制,2024,52(24):161-168.[点击复制] |
| QIAO Hui,HAN Jinglin,LI Zheng,et al.An accurate calculation method of line loss based on reconstructing a photovoltaic outputcurve by daily cumulative power generation[J].Power System Protection and Control,2024,52(24):161-168[点击复制] |
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| 摘要: |
| 针对分布式光伏接入配网后，利用传统算法计算线损存在较大偏差的问题，提出一种基于日累计发电量的光伏出力曲线分类重构方法，近似还原日出力曲线。将得到的日出力曲线数据用于基于电压修正的改进前推回代潮流法，计算配电网线损。首先进行数据预处理，建立基于受限动态时间弯曲距离(limited dynamic time warping distance, LDTW)的改进谱聚类(spectral clustering, SC)算法模型，对标准化的光伏出力曲线进行聚类，得出不同季节、不同天气下的典型出力模式。其次依据电量采集表获取的日累计发电量数据进行模式分类，并线性重构出力曲线。最后对重构后的出力曲线进行采样，采用基于电压修正的改进前推回代潮流法计算配电网线损。基于IEEE 33节点系统进行算例验证，将结果同实际光伏出力曲线计算所得线损结果进行对比。算例表明所提方法仅用光伏电表日累计发电量数据即可精确估算配电网线损。 |
| 关键词: 光伏发电 配电网 线损 前推回代法 谱聚类 动态时间弯曲 |
| DOI：10.19783/j.cnki.pspc.240599 |
| 投稿时间：2024-05-14修订日期：2024-08-11 |
| 基金项目:国家自然科学青年基金项目资助(52307199) |
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| An accurate calculation method of line loss based on reconstructing a photovoltaic outputcurve by daily cumulative power generation |
| QIAO Hui1,HAN Jinglin2,LI Zheng1,JIANG Yu3,HAN Tianhua1,FENG Tao1 |
| (1. State Grid Xingtai Power Supply Company, Xingtai 054001, China; 2. State Grid Hebei Electric Power Co., Ltd.,
Shijiazhuang 050000, China; 3. State Grid Xiongan New Area Power Supply Company, Baoding 071600, China) |
| Abstract: |
| After the distributed photovoltaic access to the distribution network, there is a large deviation in the calculation of line loss using the traditional algorithm. Therefore, a classification and reconstruction method of a photovoltaic output curve based on daily cumulative power generation is proposed to approximately restore daily output curve. The obtained daily output curve data is used in the improved forward-backward sweep power flow method based on voltage correction to calculate the line loss of the network. Firstly, data preprocessing is carried out, and an improved spectral clustering (SC) algorithm model based on limited dynamic time warping distance (LDTW) is established. The standardized PV output curve is clustered, and the typical output modes in different seasons and weathers are obtained. Secondly, the daily cumulative power generation data collected by the power acquisition meters are classified and the output curve is linearly reconstructed. Finally, the reconstructed output curve is sampled, and the improved forward-backward sweep power flow method based on voltage correction is used to calculate the line loss of distribution network. Cases are verified based on the IEEE 33-node system, and the results are compared with the line loss results calculated by the actual photovoltaic output curve. The example shows that this method can accurately estimate line loss of distributed network by only using the daily cumulative power generation data of photovoltaic meters. |
| Key words: photovoltaic power generation distribution network line loss forward-backward sweep flow method spectral clustering dynamic time warping (DTW) |
