船舶交流电网绝缘监测系统应用研究  

Research on the application of insulation monitoring system for ship AC power network

作　　者：汪洋 Wang Yang(China Ship Research and Design Center,Wuhan 430060,China)

机构地区：[1]中国舰船研究设计中心,武汉430060

出　　处：《船电技术》2024年第10期75-80,共6页Marine Electric & Electronic Engineering

摘　　要：为了能够实时在线监测电力系统网络绝缘状态,自动定位低绝缘故障支路,提出了一种船舶交流电网绝缘监测装置设计方案。介绍了双频信号注入法和单频信号注入法的工作原理,提出了基于单频信号注入法的一种绝缘监测方法和一种控制核心为STM32F103ZE芯片的硬件设计方案。编程实现运用基2时间抽取1024点FFT提取注入低频信号,提出Q表示法将浮点数转换为定点数的高精度数据存储方法。明确了注入信号的电压、相位及频率。仿真结果表明,基于单频信号注入法的电网绝缘监测装置设计方案最大误差率不超过2%,满足装置测量精度±5%的设计要求。方案提高了船舶交流电网绝缘监测装置的可靠性和有效性,大大降低船员工作强度,提高舰船电力系统的供电连续性和安全性。In order to monitor the insulation status of power system in real time and auto matically locate low-insulation fault branches,this paper proposes a design scheme of insulation monitoring device for ship AC power network.The paper introduces the working principle of double frequency signal injection method and single frequency injection method and present an insulation monitoring method based on single frequency injection signal and a hardware design based on STM32F103ZE chip.The method of extracting and injecting low frequency signals which use 1024 FFT based on 2 time extraction and a high precision data storage method of Q representation is put forward.The voltage,phase and frequency of injected signal are defined.The simulation results show that the maximum error rate of the design scheme of insulation monitoring device based on single frequency signal injection method is less than 2%,which meets the design requirement of measuring accuracy of±5%for the device.The scheme improves the reliability and effectiveness of the insulation monitoring device for the ship AC power network,and greatly reduces the work intensity,and improves the continuity and safety of the ship AC power network.

关 键 词：单频信号注入法 船舶交流电网绝缘监测装置 基2时间抽取1024点FFT Q表示法 

分 类 号：TM855[电气工程—高电压与绝缘技术]