智能低压电网网络分段时延测量技术研究

Research on measurement technology of network sectional delay in smart low⁃voltage grid

对智能低压电网终端、分支点、集中器之间分段时延测量的研究,有助于其网络拓扑的发展。为解决现有测量技术,不能高精度在线测量端到端、端到分支点之间时延的问题,该文提出一种基于电力线通信技术和扩频通信技术相结合的低成本、高精度时延测量技术,通过仿真研究并给出了该系统抗白噪声、多径以及窄带干扰的性能指标。仿真结果表明,所提技术,在信噪比大于-11 dB的白噪声、信干比大于4 dB的多径信号以及信干比大于-3 dB的窄带干扰下,均能实现±10 ns的测量精度。

The research on the measurement of sectional delay between terminals,branches and concentrators of smart low voltage grid is helpful to the development of its network topology.A low⁃cost and high⁃precision delay measurement technology based on the combination of power line communication technology and spread spectrum communication technology is proposed to solve the problem that the existing measurement technology can not accurately measure the delay between end⁃to⁃end and end⁃to⁃branch points online.The performance indexes under anti⁃interference of white noise,multi⁃path signal and narrowband signal are given by means of the simulation research.The simulation results show that the proposed technique can achieve±10 ns measurement accuracy under the white noise with signal⁃to⁃noise ratio greater than-11 dB,multi⁃path signal with signal⁃to⁃interference ratio(SIR)greater than 4 dB and narrowband interference with SIR greater than-3 dB.