非标准工况下数字化电能表运行性能分析与评估研究

数字化电能表作为电能计量终端装置,其计量的可靠性与准确性意义重大。目前,通过国家标准检定的数字化电能表,在工程应用中仍然出现运行不稳定及计量失准的情况。究其原因是对现场非标准工况条件下数字化电能表运行性能的研究不够深入。为了研究数字化电能表现场运行中出现问题的来源,保证电能计量的准确性,研发了数字化电能表运行性能分析与评估系统。模拟现场非标准工况条件对三个不同厂家生产的数字化电能表运行性能进行了分析与评估。评估结果表明,受数字化电能表前端设备采样频率限制和内部缺少噪声过滤机制及电能计量算法准确度不够的影响,数字化电能表容易出现运行不稳定及计量失准现象,应提高计量算法精度,提升非标准工况条件下的适应性。研究成果一方面能为数字化电能表厂家提供技术改进思路;另一方面能为数字化电能表相关检测标准的改进提供参考依据。

Research on Digital Watt-hour Meter Running Performance Analysis and Evaluation at Non-standard Load Conditions

As the terminal device of electric energy metering, the measurement accuracy and reliability is great importance of digital watt-hour meter.At present, the digital watt-hour meter still have some running issues that passed the national standard verification, and the reason is that the research is not deep enough of digital watt-hour meter running performance under non-standard load condition.In order to find the source of the problems and ensure the accuracy of electric energy metering, this paper developed a digital watt-hour meter running performance analysis and evaluation system, simulating non-standard load conditions to test and evaluate three different digital watt-hour meters, evaluation results show that the digital watt-hour meter is easy influenced by non-standard load conditions because limitation of sampling frequency of front-end equipment, lack of noise filtering mechanism and the algorithm accuracy is not enough, should improve the measurement precision of algorithm and improve the adaptability under non-standard load condition.The research results in this paper not only can be used to improve the technology of digital power meter manufacturers, but also can provide reference for the improvement of related test standards of digital watt-hour meter.