规模化电采暖设备对配电网电能质量的影响分析

随着"煤改电"工程的实施,大量的电采暖设备会向配电网中注入谐波电流,并在启动过程中引起电压暂降,直接影响配电网的电能质量。通过物理模型研究和负荷现场实测的方式,针对不同类型的电采暖设备所产生的谐波含量进行了差异化分析。构建了电采暖设备在配电网不同运行场景下的仿真模型,研究了规模化电采暖对配电网谐波含量及电压暂降的影响程度和限制措施。案例分析表明,随着电采暖设备负荷渗透率的增加,配电网中的谐波含量会有不同程度的提高,电压暂降问题尤其明显,需要采取设备改进和运行控制等方式缓解电采暖设备对电能质量的影响。

Analysis on Impacts of Large-scale Electric Heating Radiators to Power Quality of Distribution Networks

With the advance of the Coal-to-electricity project, the harmonic current is injected into distribution networks from a large number of electric heating radiators, and the voltage sag is simultaneously resulted in, which have an immediate impact on the power quality of the distribution networks. On the basis of physical model analysis and practical load data, the differential analysis is carried out for the harmonic contents of different types of electric heating radiators. The simulation model of the radiators is constructed under different operation conditions. The influence degrees of harmonic contents and voltage sag resulted from the radiators are then analyzed and the corresponding measures are determined. Case study shows that the harmonic contents and the voltage sag in the low voltage distribution networks increase in varying degrees with adding the permeability of the radiators. Therefore, there is a need to adopt corresponding measures including equipment improvement and operation optimization to restrain these power quality problems.