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Feasibility Study on Real-time Measurement System of Voltage-Current Waveform in Molded Type of Voltage-Current Sensor in Power Distribution Systems

配电系统模压式电压电流传感器电压电流波形实时测量系统的可行性研究

基本信息

批准号：
14550268
负责人：
FURUKAWA Tatsuya
金额：
$ 2.3万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

The real-time observation of a power factor will be essential for the maintenance and the stable voltage regulation in three-phase power distribution systems. Recently, the higher harmonics effect, that may be produced through solid state power converter and inverter systems in factories and homes, has been a serious obstacle, that will result in the destruction of the power apparatus such as an inductor for phase compensation. Therefore the concurrent measurement of both the voltage and current waveforms must be an indispensable technology in power distribution systems. To carry out the concurrent observation of both the voltage and current waveforms, we have devised and proposed a resin molded type of voltage-current sensor, where the design of the geometry of electrodes will be free to some extent, and discussed the fundamental behavior of the new sensor theoretically using the Finite Element Method (FEM).In this project, at first, we have investigated the transient electromagnetic phenomena in the present resin type sensor using the modified FEM analysis aided by the backward finite difference method. As a result, we-have been able to grasp the dynamic behavior of the sensor including the higher order harmonics, that have been observed in the current waveform of the sensor under the pseudo power distribution system at our laboratory. We have designed and implemented the real-time observation system using the Hitachi Microprocessor H8 single board computer system, that has the 10 bits A/D converter and the Ethernet adapter, and the wireless local area network router. Using the H8 operating system(H8 OS), that supports the data based on the HTTP protocol(the port number of 80), when the data acquisition request will be thrown to the single board computer system, the digital data through the AID converter will be obtained over the wireless local network system.

功率因数的实时观测对于三相配电系统的维护和稳定电压调节至关重要。近来，工厂和家庭中的固态功率转换器和逆变器系统可能产生的高次谐波效应已经成为严重的障碍，这将导致诸如用于相位补偿的电感器的功率设备的破坏。因此，电压和电流波形的同时测量必然是配电系统中不可或缺的技术。为了实现电压和电流波形的同时观测，我们设计并提出了一种树脂模制型电压-电流传感器，其中电极的几何形状的设计将在一定程度上是自由的，并使用有限元法（FEM）从理论上讨论了新传感器的基本行为。本文采用改进的有限元分析方法，并辅以向后有限差分法，研究了目前树脂型传感器中的瞬态电磁现象。因此，我们已经能够掌握的传感器的动态行为，包括高次谐波，已观察到的传感器的电流波形下的伪电源分配系统在我们的实验室。我们设计并实现了一个实时观测系统，该系统采用日立微处理器H8单板计算机系统，具有10位A/D转换器和以太网适配器，以及无线局域网路由器。使用支持基于HTTP协议（端口号为80）的数据的H8操作系统（H8 OS），当向单板机系统抛出数据采集请求时，通过A/D转换器在无线局域网系统上获得数字数据。