间谐波相序特征和闪变传播特性的研究

Study on Characteristics of Phase Sequence and Flicker Spread of Inter-harmonic

随着电力电子等非线性装置和负荷在电力系统中的广泛应用,大量间谐波注入系统。为了提高电网运行的电能质量。有必要对电力间谐波在电网运行中的特点深入研究。针对交直交变流器系统总结了电力谐波和间谐波的相序特征,分析了两者相序特征的不同。在此基础上,研究了单个间谐波和间谐波成对存在时,引起的电压峰值波动和有效值波动。通过实例仿真计算表明基波初相位、间谐波的相序和变压器连接方式会影响问谐波传播的相位关系,从而影响到间谐波的波动闪变效果。本文的研究工作对间谐波的测量和抑制具有指导意义。

With the wide range of applications of power electronics in power system, a large number of inter-harmonics inject into the system. In order to improve the power quality of grid, it＇s neeessal7 to study the characteristics of inter-harmonies. In the AC- DC converter system, phase sequence characteristics of harmonics and inter-harmonics are summarized, and the difference thereof is analyzed. The peak voltage and RMS fluctuations caused by a single inter-harmonics and inter-harmonics in pairs are analyzed. The results of simulation confirm that the initial phase of the fundamental, phase sequence of inter-harmonic and transformer connections will affect the phase relationship of inter-harmonic propagation, thus affecting the flicker. It is significant for inter-harmonic measurements and inhibition, and it can improve the knowledge reserves of power quality improvement.