新能源发电上网关口计量用互感器二次负荷分析及选型建议

随着光伏、风电等新能源迅猛发展,新能源发电装机容量比重日益增大。作为关口电能计量装置的重要组成部分,互感器二次负荷的大小对其误差存在不可忽视的影响。对河南电网新能源发电上网关口计量用互感器二次负荷进行了全面统计。结果显示,大部分新能源互感器二次负荷额定容量配置过大,既不满足规程要求,也对计量误差造成了不利影响。实际试验表明,二次负荷选择不合理会造成计量误差偏移,甚至超差。最后,提出了新能源发电上网关口计量用互感器二次负荷的选型建议,供从事电能计量工作相关技术人员参考。

Analysis and selection proposal of secondary load of metering transformer in new energy generation gateways

With the rapid development of new energy, such as photovoltaic and wind power, the installed capacity of new energy generation which has been an important part of power energy is increasing. As a vital part of gateway electric energy metering device, secondary load has a non-ignorable influence on error of transformer. This paper makes a comprehensive statistics of the secondary load of metering transformers in new energy generation gateways of Henan power grid. Results show that most of the secondary loads of metering transformers are too large, which is not only unable to meet the requirements of the regulation, but also makes a negative effect on the metering error. Practical experiment shows that unreasonable selection of secondary load leads to deviation of metering error, even exceeding to the error limit. Finally, it puts forward the selection proposals for the secondary load of metering transformer in new energy generation gateways, which provides reference for technicians engaged in electrical energy measurement. This work is supported by Fundamental Research Funds for the Central Universities (No. 2018QN072) and Science and Technology Project of State Grid Henan Electric Power Company (No. 52170217001C).