摘要
针对平衡变压器平衡供电的特点,提出了一种利用逆变器对三相变两相供电方式下的电流负序分量进行综合平衡补偿的新方法。该方法的整体结构由交-直-交单相逆变器与平衡变压器两相侧并联组成,以抑制和补偿各相的谐波电流和无功分量;并实时检测α、β两相负载电流的有功分量之差,利用逆变器的桥接结构实现有功功率在两相间快速流动。从而使平衡变压器两相侧的输出电流对称,消除平衡变压器三相侧产生负序电流的条件,达到三相电流对称的目的。仿真和实验结果证明了该方法的正确性,具有可行性。
Aiming to characteristic of 3-phase to 2-phase power supply based on balance transformer, a new current balance compensation method utilizing inverter is proposed, which is mainly used to compensate negative sequence current. The system structure of current balance compensation method is constituted by balance transformer and an AC-DC-AC single-phase inverter connected in parallel, to suppress harmonic current and compensate reactive current. Furthermore, it detects the active current difference of α and β-phase load, then makes active power flows from the light load side to the heavy side through the inverter BRIDGE. The result is α and β phases equivalent loads of the transformer reach to balance state, and eliminates the precondition to bring negative sequence current to insure the current symmetry of three-phase side of the transformer. The proposed compensation method is verified viable by simulation and experiment results.
出处
《电工技术学报》
EI
CSCD
北大核心
2007年第5期53-57,共5页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50247006)。
关键词
电流平衡补偿
逆变器
平衡变压器
负序电流
谐波
电气化铁道
Current balance compensation, inverter, balance transformer, negative sequence current, harmonics, electrified railway
作者简介
欧阳帆,男，1979年生，博士研究生，研究方向为电力电子技术在电力系统中的应用、电能质量控制。
周有庆,男，1944年生，教授，博士生导师，从事电力系统继电保护，输变电技术及新型平衡变压器方面的教学和科学研究工作。
