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针对城市轨道交通供电系统,对系统产生的谐波进行分析,指出了谐波的危害,分析了谐波的特征,并详细分析了非特征次谐波存在的原因。在此基础上,提出了解决谐波问题的方案和措施,明确指出轨道交通供电系统应安装滤波装置,而且指出安装有源滤波装置APF是最好的措施,并阐述了APF的原理和优点。根据系统的要求,可以灵活地补偿非线性负载的谐波,也可以同时补偿谐波和无功电流。采用该方法不但可以降低谐波对电网的影响,也可以提高自身系统的运行质量和可靠性,同时也可以提高功率因数。
For the urban rail transit power supply system, the harmonics generated by the system are analyzed, the harm of harmonics is pointed out, the characteristics of the harmonics are analyzed, and the reasons for the existence of non-characteristic subharmonic are analyzed in detail. On this basis, the solutions and measures to solve the harmonic problem are put forward. It is pointed out clearly that the filtering device should be installed in the rail transit power supply system. Moreover, it is pointed out that the APF with the active filtering device is the best measure and the principle and advantages of the APF are described. Depending on the system requirements, harmonics can be flexibly compensated for non-linear loads, harmonics and reactive currents can be compensated simultaneously. Using this method can not only reduce the impact of harmonics on the power grid, but also improve the running quality and reliability of its own system and at the same time improve the power factor.