DC/AC工况下的直流电能计量误差分析Error Analysis of DC Energy Metering under DC/AC Operating Condition
姚力,章江铭,倪琳娜,沈曙明,袁健,刘炜
YAO Li,ZHANG Jiangming,NI Linna,SHEN Shuming,YUAN Jian,LIU Wei
摘要(Abstract)：
随着直流输配电网的进一步推广,直流电能表将逐渐作为贸易结算的依据,其准确性有待进一步验证。基于具体工况的直流电能表设计及计量研究是提高电能表准确性和合理性的有效方法。探讨了DC/AC支路模块接入直流配电网工况条件下应用的电参数特征,分析了直流电能表在DC/AC直流端的电流特征,根据当前电能计量芯片大都基于瞬时积分法原理进行电能计量的现实,利用瞬时积分原理推导了DC/AC支路模块接入直流配电网工况条件下的电能计量过程,搭建了相应的仿真电路进行了验证。结果表明:DC/AC支路模块直流电压、电流存在不同频率的交流分量时,直流计量将产生误差。
With the promotion of DC transmission and distribution networks, DC energy meter will be gradually used as the basis for cost settlement. However, its accuracy needs to be further verified. The design and measurement of DC energy meter based on specific working conditions is an effective way to improve the accuracy and rationality of the energy meter. This paper discusses the electrical parameter characteristics of the DC/AC tributary module accessed to the DC distribution network and analyzes current characteristics of DC meter at the DC/AC DC terminal; according to the fact that most of the currently used energy measurement chips are based on the instantaneous integration method, the electric energy measurement process of DC/AC tributary module connected to DC distribution network is derived by using instantaneous integration method.The corresponding simulation circuit is built for verification, and the result shows that there are errors in DC metering when there are AC components of various frequencies in DC voltage and current in the DC/AC tributary module.
关键词(KeyWords)：
直流电网;电能计量;DC/AC
DC grid;energy metering;DC/AC
基金项目(Foundation): 国网浙江省电力有限公司科技项目(5211DS180034)
作者(Author):
姚力,章江铭,倪琳娜,沈曙明,袁健,刘炜
YAO Li,ZHANG Jiangming,NI Linna,SHEN Shuming,YUAN Jian,LIU Wei
DOI: 10.19585/j.zjdl.202007010
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