低压配电系统零序谐波电流特性研究

摘要

针对连接组别为D， yn11的配电变压器，采用对称分量法分析低压配电系统带三相对称非线性负荷和不对称非线性负荷时，低压侧零序谐波电流与高压侧零序谐波电流特性。从理论上证明了低压侧非线性负载不对称时，采用三角形连接的变压器高压侧也将出现零序谐波电流，并通过仿真和实验验证了理论分析的正确性。%As for the distribution transformer of D, yn11 connection, the symmetrical component method is applied to analyze the zero sequence harmonic current characteristics of the low and high voltage sides when the low-voltage distribution system is bearing the three-phase symmetric/asymmetric non-linear load. It theoretically proves that when the non-linear load is unsymmetric at the low-voltage side, the zero sequence harmonic current also occurs at the high-voltage side of the transformer of delta connection. Simulations and experimental verification are also available for the theoretical analysis.