低压配电网三相不平衡度监测系统的研究设计电子与通信工程专业论文.docxVIP

华北电力大学硕士学位论文摘 华北电力大学硕士学位论文 摘 要 当前国内的低压配电网主要是由变压器通过三相四线制的方式为用户提供电 能。而三相不平衡的现象一直存在于国内的大多数低压配电网络中。三相不平衡 的出现是由于用电负荷在各相的不均匀分配。加之我国的配电网一直很难达到比 较先进的自动化程度，这个问题长时间难以解决。如果电网在三相不平衡很严峻 的条件下长期运作，对供电和用电两者均会带来严重的危害。所以急需一种三相 不平衡监测装置，实时监测三相不平衡状况，从而找到相应的改进措施。本文主 要研究内容主要是以下几点： (1)研究了各种电能质量监测的主流算法之后，最终确定使用混合基FFT 算法； (2)设计出一种三相不平衡监测装置的总体设计方案，分析了核心硬件模块， 明确了软件编程的基本步骤； (3)在实验室条件下，对三相不平衡装置进行试运行，并对监测数据进行了 分析。然后将监测装置配置在低压配电网中进行监控，结果显示该监测装置可以 完成配电网的三相不平衡监测功能。 关键词：三相不平衡；低压配电网；数字信号处理；GPRS 万方数据 华北电力大学硕士学位论文Abstract 华北电力大学硕士学位论文 Abstract At present，the low voltage distribution network in China is mainly supplied by the transformer by means of three—phase four wire system．In the low voltage power distribution network in China，the problem of three-phase unbalance always exists．The appearance of three-phase unbalance is due to the uneven distribution of the electric load in each phase．In addition，Chinas distribution network has been difficult to achieve more advanced automation，this problem is difficult to solve for a long time．If the power grid is in a long term operation under three-phase unbalanced conditions，it Can bring serious harm to both power supply and power supply．So it is in urgent need of a three-phase unbalanced monitoring device，real-time monitoring of the imbalance of the status，SO as to find the corresponding improvement measures．The main research contents of this paper are the following： (1)After studying the mainstream algorithm of various power quality monitoring， the mixed radix FFT algorithm is finally determined； (2)The overall design of three phase unbalance monitoring device is designed， and the various core hardware modules are analyzed， and the programming idea about software iS determined； (3)Three phase unbalance monitoring device is debugged and trailed under the condition of laboratory to verify the accuracy and reliability of the device；Furthermore， the monitoring device is installed in the low voltage distribution network．Analysis results show that the three phase unb