摘要
谐波、三相不平衡是长期存在于电力系统中的电能质量问题,对电力系统的稳定、经济运行产生很大影响,需要有针对性地进行研究。首先分析国内外现有的变压器在电能质量影响下的损耗研究情况及其适用范围的局限性,提出在多种电能质量因素共同影响下,变压器能效评估方法的必要性。然后分析谐波、三相不平衡两种电能质量因素单独作用时,对变压器能效的影响,提出了损耗计算的改进公式。最后在此基础上,综合分析这两种电能质量因素共同作用对变压器的交互性影响,并通过算例仿真证明了理论分析结果的正确性,同时进行数据对比,结果表明交互性影响产生的损耗不容忽视。通过探究变压器在电能质量因素综合影响下的损耗特性与能效变化,得出两种电能质量因素影响下变压器的改进损耗模型,可以更精确地计算变压器损耗数值。
Harmonic and three-phase unbalance are the quality problems of power that exist in the power system for a long time, which have a great impact on the stability and economic operation of the power system, and are of great significance to the research. Firstly, the loss research situation of existing transformers under the influence of power quality at home and abroad and the limitations of its applicable scope are analyzed, and the necessity of energy efficiency evaluation method of transformer under the influence of composite power quality factors is put forward. Then the influence of harmonics and three-phase unbalanced power quality factors on the energy efficiency of the transformer is analyzed, and an improved formula for the loss calculation is proposed. On this basis, the interaction effects of these two power quality factors on the transformer are comprehensively analyzed, and the correctness of the theoretical analysis results is proved and the data through the simulation of the example are compared. The results show that the loss caused by the interaction can not be ignored. By exploring the loss characteristics and energy efficiency changes of transformers under the comprehensive influence of power quality factors, the improved loss model of transformers under the influence of two power quality factors can be obtained to calculate loss value of transformers more accurately.
作者
陈子辉
麦荣焕
倪惠浩
孟炘
CHEN Zihui;MAI Ronghuan;NI Huihao;MENG Xin(Guangdong Power Grid Co.,Ltd.,Jiangmen Power Supply Bureau,Jiangmen 529000,China;School of Automation,Guangdong University of Technology,Guangzhou 510006,China)
出处
《供用电》
2020年第5期64-72,共9页
Distribution & Utilization
基金
广东省科技计划资助项目(2016A010104016)
广东电网有限责任公司科技项目(GDKJXM20172877)。
关键词
变压器
能效评估
谐波
三相不平衡
损耗增加
transformer
energy efficiency assessment
harmonic
three-phase unbalance
loss value added
