作者：王文天1, 姜小涛1, 葛磊蛟2, 方磊1, 嵇文路1, 李泽平2
作者单位：1. 国网江苏省电力有限公司南京供电分公司，江苏 南京 210019;
2. 天津大学电气自动化与信息工程学院，天津 300072
关键词：分布式光伏系统;数据采集;无人机中继;短包传输;高可靠低延时通信;凸优化
摘要：
现有的分布式光伏数据采集传输系统一般采用蜂窝网络传输运维数据，尽管数据传输的精准度较为稳定，但存在蜂窝数据资费高、非视距传输等缺点，且在点多面广、分散无序的分布式光伏运维数据采集过程中容易出现数据延时严重、无法断点续传等问题。为此，该文利用无人机作为通信中继，破解分布式光伏运维数据传输延时的困境，实现分布式光伏运维数据的高可靠、低延时传输。构建分布式光伏系统运维数据采集过程中选用无人机中继传输的资源优化模型，进一步将该模型等效为有限分组长度机制下误码率最小化问题，并提出一种交替优化的资源分配算法，通过联合优化分组长度分配方案和无人机位置，实现分布式光伏运维数据采集的最小化解码误码率，以满足数据精准和可靠性需求的同时，也达成数据传输的高效率和低延时。仿真案例结果表明，该文所提出的交替迭代方法与穷举搜索法相比，具有收敛性好、复杂度低等优点。
Distributed PV maintenance data transmission technology based on URLLC
WANG Wentian1, JIANG Xiaotao1, GE Leijiao2, FANG Lei1, JI Wenlu1, LI Zeping2
1. Nanjing Power Supply Company of Sate Grid Jiangsu Electric Power Co., Ltd., Nanjing 210019, China;
2. School of Electrical and Information, Tianjin University, Tianjin 300072, China
Abstract: Current distributed photovoltaic (PV) system transmits maintenance data through cellular network. Although accuracy of data transmission is relatively stable, there are shortcomings such as high cellular data tariffs and non-line-of-sight links. Besides, with multiple points and wide, scattered and disorderly deployment of PV system, there are problems such as serious data delay and inability to resume transmission. Therefore, this paper considers unmanned aerial vehicle as a relay to solve the dilemma of distributed PV data transmission delay and achieve transmission under the requirements of ultra-reliability and low-latency communication (URLLC). Based on resource optimization model of UAV relay in distributed photovoltaic system, this paper further equates it to the problem of minimizing error rate under finite packet length regime. This paper proposes a resource allocation algorithm based on alternate optimization to find optimal packet length and UAV position to meet the reliability requirements of PV maintenance data transmission. It is proved that the proposed method has advantages of favorable convergence as well as lower complexity with compared to exhaustive search.
Keywords: distributed PV system;data acquisition;UAV relay;short packet;URLLC;convex optimization
2021, 47(11):127-133 收稿日期: 2021-07-26;收到修改稿日期: 2021-09-03
基金项目: 国家重点研发计划项目资助(2018YFB1500800)；国网江苏省电力有限公司科技项目(J2020082)
作者简介: 王文天（1971-），男，江苏南京市人，高级政工师，硕士，研究方向为电力营销、分布式能源、智能用电及电力物联网技术等
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