多频带自适应技术在电力载波方面的研究

智能电网的数字化和信息化建设,对电力载波通信技术提出了更高要求。传统协议标准如G3-PLC已难以适用于复杂、时变、差异性的电网信道,需要对其带宽标准和信道容量进行改进。正交频分复用技术(Orthogonal Frequency Division Multiplexing,OFDM)是电力载波通信的主流方法,可以在其固定带宽的基础上进行多频带改造,实现带宽的自适应选择和信道容量的扩增。为此,提出一种基于OFDM的多频带自适应技术,以实现在7. 8 kHz～10 MHz跨频带范围内自适应选择合适的工作频率和通信带宽,来完成信息的有效传输。从现场的低、中压测试结果看,所提出的多频带自适应技术能够有效增大信道容量,并提高数据传输的可靠性和电力载波通信的线路覆盖率。

Research on Multiband Adaptive Technology in Power Line Carrier

With the construction and development of smart grid, the traditional protocol standards for power line carrier communication, such as G3-PLC, have been difficult to adapt to complex, time-varying, and differential grid channels. It is necessary to improve the bandwidth standard and channel capacity in order to meet the demand of the development of smart grid. Orthogonal Frequency Division Multiplexing (OFDM) is the mainstream method of power line carrier communication. We can make multi-band transformation on the basis of its fixed bandwidth to realize the adaptive selection of bandwidth and the expansion of channel capacity. Therefore, this paper proposes a multi-band adaptive method based on OFDM technology, which can adaptively select the appropriate operating frequency and communication bandwidth in the 7.8kHz ~ 10MHz cross-band range. From the results of low and medium voltage test, the proposed multi-band adaptive technology can effectively increase the channel capacity and improve the reliability of data transmission and line coverage of power line carrier communication.