谐波在电网侧的污染量不仅取决于非线性负荷发射,更与谐波在整个系统中的传导息息相关, 而目前关于谐波传导评估多采用直接的平均电流放大公式, 并没有深入的研究不同谐波频次的综合影响, 也鲜有明确的谐波系数算法。本文基于Parseval等式--Rayleigh能量定理, 考虑谐波旁瓣频次, 提出了一种针对非线性负荷谐波传导的谐波系数算法, 弥补了根据单谱线平均电流放大倍数衡量谐波传导的不足。给出了基于非线性负荷的MATLAB仿真计算实例, 并在EAST实验中通过与实测数据对比验证了其正确性。

The harmonic pollution on the power grid depends not only on the generation of nonlinear thyristor-based converter load, but also on the amplification of harmonics throughout the reactive power compensation system. At present, the harmonic current amplification formula is often used for the conduction evaluation, but it is difficult to characterize the mechanism of the whole spectrum conduction. Based on the Parseval-Rayleigh energy theorem criterion, a harmonic coefficient algorithm for nonlinear load is proposed. The calculation example of harmonic coefficient for the nonlinear load by MATLAB is analysed, and the correctness is validated by comparing with the measured data in the EAST experiment.