In recent years, our country's port companies have adopted a lot of SCR rectifier and SCR converter equipment. This has led to a serious reduction in the quality of power distribution. What is more serious is the series or parallel resonance formed by the high-order harmonics generated by these devices and the system capacitive reactance and system impedance in the power distribution network under certain conditions, resulting erious damage to some equipment. The harm of harmonics to the port's power distribution system has attracted people's attention. It is urgent to suppress harmonics and improve the quality of power distribution.
Due to the use of high-speed changing door cranes in a port, normal reactive power compensation devices can’t be used for power factor compensation. The harmonics flowing through cables and transformers cause increased losses, and user active losses increase, which requires more electricity bills. In addition, interest rate fines ranging from 10,000 to 20,000 are incurred every month. Under the situation of energetically advocating energy saving and consumption reduction, science and technology and environmental protection, the port timely invested funds to improve power quality.
After installing dynamic anti-harmonic reactive power compensation device, the average power factor reached above 0.95, the harmonic content was greatly reduced, the energy-saving effect was obvious, and the power quality of the system was greatly improved.