±800 kV特高压直流输电系统特征谐波分析

将统一基波和特征谐波潮流算法用于分析±800 kV特高压直流输电系统的特征谐波，建立了能模拟换流装置非线性特性的双12脉动换流器数学模型，实现了基波潮流和谐波潮流的统一求解。计算结果表明由双12脉动串联结构换流器构成的±800 kV特高压直流输电系统的交流侧会产生12 k±1次的特征谐波，其直流侧会产生12 k次的特征谐波，与理论分析的结果一致。由于考虑了换流站交直流侧谐波的相互作用，该计算结果与实际情况更为接近。

Analysis of Characteristic Harmonics in ±800 kV Ultra High Voltage Direct Current Power Transmission System

The unified fundamental and characteristic harmonic load flow algorithm is applied to the analysis of characteristic harmonics in ±800 kV ultra high voltage direct current (UHVDC) power transmission system for the first time and a mathematical model of double 12 pulse converter that can simulate nonlinear characteristics of converter devices is built, thus the unified solution of fundamental load flow and harmonic load flow can be implemented. Calculation result shows that the structure of double 12 pulse series converters of ±800 kV UHVDC power transmission system will produce characteristic harmonics in 12 k±1 orders at the AC side as well as characteristic harmonics in 12 k orders at the DC side, the calculation results coincides with the result of theoretical analysis. Due to considering the interaction of harmonics at AC and DC sides of converter station, the calculation result is more close to actual situation.