基于移相电抗器的电力推进船舶电网谐波抑制

电力推进船舶电网是一个典型的独立供电系统,由于发电容量有限,对非线性负荷的抗干扰能力比较差,尤其是随着电力电子技术在船舶上的广泛应用,电能变换过程中的非线性现象加重,由此带来的谐波等电能质量问题不容忽视.相对于采用组网方式形成的大电网而言,独立小电网的系统短路容量较小,而谐波源相对容量较大,因此,谐波造成的影响就会更大.本文提出了一种采用移相电抗器的方法来抑制这种独立电网的谐波,并对移相绕组的配置和移相角的选择进行了分析,基于EMTDC/PSCAD的仿真结果验证了所提方案的正确性和有效性.

Harmonic Suppression in the Electric Propulsive Shipping System Based on Phase-Shifting Reactor

The electric propulsive shipping power grid is a typical independent power supply system. The anti-jamming ability to non-linear load is quite weak for the limiting generating capacity. Especially along with the widespread application of the power electronic technology on the ships, the power quality problem such as the large quantity of harmonics that caused by the aggravated non-linear phenomenon in electrical energy transformation process cannot be neglected. The short-circuit capacity of the independent system is relative small compared to the big power grid, while the capacity of the harmonic is relative big. So the influence of the harmonics becomes more serious. A novel method to suppress the harmonics of this kind grid by adopting the phase-shifting reactor is put forward in this paper. The configuration of the phase-shifting windings is analyzed in detail and the optimal selection of the phase-shifting angle is also done. The accuracy and the effectiveness are verified by the EMTDC/PSCAD based simulation results.