摘要
并联电容器组频繁投切补偿电网无功过程产生严重涌流和谐波,瞬间过电压和大电流对电容器单元运行安全威胁极大。提出一种基于无线传感技术的电力电容器状态监测方案,通过铁心磁场分布、材料特性和线圈输出功率分析,确定传感器采用闭路铁心高压取能、开路铁心测量的双CT结构,利用内置A/D及ZigBee通信协议栈的CC2530芯片,以及专用信号处理电路实现电容器单元电流和温升感知;由低功耗IEEE 802.15.4标准协议将终端节点信息加密无线组网,汇聚的数据在后台机进行综合判别分析。双铁心结构传感器的紧凑化设计,解决了铁心磁性饱和下高位取能、线性区的准确测量问题,实现了传感器现场高压绝缘、抗干扰和无线组网设计的整体性能优化。
The process of frequent switching of parallel capacitor to compensate for power grid reactive power produces serious inrush current and harmonics.The transient over-voltage and large current pose a great threat to the safe operation of capacitor unit.A kind of power capacitor condition monitoring program based on wireless sensing technology is proposed.Through the analysis of core magnetic field distribution,material characteristics and coil output power,the double CT sensor structure with closed-circuit core for high-voltage energy extraction and open-circuit core for measurement is determined.The built-in A/D and the CC2530 chip of the ZigBee communication protocol stack as well as the dedicated signal processing circuit are used for current and temperature rise sensing of the capacitor unit;The low-power IEEE802.15.4standard protocol encrypts the terminal node information for wireless networking,and the aggregated data is comprehensively judged in the background machine analysis.The compact design of the dual-core structure sensor solves the problem of high energy extraction and accurate measurement of linear zone under the magnetic saturation of the iron core,and achieves the overall performance optimization of the sensor’s onsite high-voltage insulation,anti-interference and wireless networking design.
作者
赵东生
黄缙华
王云龙
李波
尚观远
赵书涛
ZHAO Dongsheng;HUANG Jinhua;WANG Yunlong;LI Bo;SHANG Guanyuan;ZHAO Shutao(Guang Power Grid Electrci Power Research Institute,Guangzhou 510080,China;Huizhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangdong Huizhou 516000,China;China Southern Power Grid Key Laboratory of Power Grid Automation Laboratory,Guangzhou 510080,China;North China Electric Power University,Hebei Baoding 071003,China)
出处
《电力电容器与无功补偿》
2023年第1期20-26,共7页
Power Capacitor & Reactive Power Compensation
基金
广东电网有限责任公司科技项目(GDKJXM20190404)。
关键词
并联电容器组
在线监测
复合传感器
高压自取能
无线组网
parallel capacitor bank
online monitoring
intelligent sensor
high-voltage self-energy extroction
wireless networking
