中国电力 ›› 2013, Vol. 46 ›› Issue (8): 128-132.DOI: 10.11930/j.issn.1004-9649.2013.8.128.4

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参数辨识方法的三相不对称负载电能计量研究

仇淑敏1, 杨浩1, 殷家敏2, 欧勇2, 罗建1   

  1. 1. 重庆大学 输配电装备及系统安全与新技术国家重点实验室,重庆 400044; 2. 长寿供电局 调度控制中心,重庆 401220
  • 收稿日期:2013-04-25 出版日期:2013-08-23 发布日期:2015-12-10
  • 作者简介:仇淑敏(1986—),女,山东潍坊人,硕士研究生,从事电力系统自动化、电能计量理论研究。

Study on Measurement of Three-Phase Asymmetric Loads Based on Parameter Identification

QIU Shu-min1, YANG Hao1, YIN Jia-min2, OU Yong2, LUO Jian1   

  1. 1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China; 2. Scheduling Control Center of Changshou Power Supply Bureau, Chongqing 401220, China
  • Received:2013-04-25 Online:2013-08-23 Published:2015-12-10

摘要: 以三相四线制星形连接供电系统为例,分析了三相负载的不对称性对负载电能计量的影响。提出了三相负载虚拟中性点电压参数辨识的改进用户电能计量方法:在用户侧负载参数未知的情况下,利用同步采样三相电路公共连接点的实测电压、电流波形,采用参数辨识方法辨识负载虚拟中性点的电压,从而做到准确计量三相负载电能。通过Matlab仿真实例,将传统电能计量值和基于辨识方法的电能计量值分别与三相负载实际消耗的电能作比较,验证了该电能计量方法的准确性及合理性。

关键词: 不对称负载, 虚拟中性点电压, 参数辨识, 电能计量

Abstract: Taking the three-phase four-wire system as an example, the impact of asymmetric loads on electric energy measurement is studied. In this paper a new method to improve the electric load measurement based on virtual neutral point voltage parameter identification is proposed, that is, under unknown load parameters at the consumer side, the virtual neutral point voltage is identified with the voltage and current waveforms sampled synchronously at the point of common coupling of three-phase load, so as to accurately measure and compute the value of three-phase loads. Through the simulation using Matlab, the electric power measurement values with traditional method and parameter identification method are compared respectively regarding the actual load consumption values, which verifies the accuracy and reasonableness of the proposed method.

Key words: asymmetric load, virtual neutral point voltage, parameter identification, electric energy measurement

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