1绪论在电力系统中,持续供电已经变成对电力部门的一个挑战。用户对转换开关和现代化电子电路使用量的增加,为配电网络注入了不可预测的谐波,扰乱了供电质量。公共电网提供的电力出现谐波失真的现象是由于电网中非线性负载产生的电流幅度增加。所以电网工程师必须认真分析非线性用户负载的电流波形。这些负载包括现代化的电子设备,如超级计算机、变速驱动器、现代电子镇流器以及在运行过程中需要经常切换的其他电子设备。所有的电力公司都致力于使电压保持恒定的幅度和频率,没有任何失真。对于所有的线性用户负载(如加热器、白炽灯以及所有只包含电阻元器 1 Introduction In power systems, continuous power supply has become a challenge to the power sector. The user’s increased use of change-over switches and modern electronic circuits injects unpredictable harmonics into the distribution network, disrupting the quality of the power supply. The phenomenon of harmonic distortion in the power provided by the public power grid is due to the increase of the current amplitude generated by the non-linear load in the power grid. Therefore, grid engineers must carefully analyze the current waveforms of nonlinear user loads. These loads include modern electronic devices such as supercomputers, variable speed drives, modern electronic ballasts, and other electronic devices that require frequent switching during operation. All power companies are committed to keeping the voltage at a constant amplitude and frequency without any distortion. For all linear user loads (such as heaters, incandescent lamps, and all that contain only resistive elements