Background and Current System Issues: A gantry crane is composed of cranes and hoists, and the power supply for its AC motor drive usually comes from the DC BUS to increase the power usage efficiency. During operation the speed of the cranes and hoists changes rapidly and constantly, and so does the power usage. The unstable electricity may cause a large amount of harmonics, resulting in severe damage to the reactive compensation capacity. Once the reactive compensation capacity is damaged, it may fail to compensate current normally, and the power voltage would fluctuate severely as well. With unstable power and harmonic pollution, the gantry crane system may easily breakdown, threatening the power system and safety of the harbor.
Delta’s Solution: Delta’s gantry crane solution adopts Delta’s SVG2000 Series static var generator to perform highly efficient power compensation and to decrease harmonics. The SVG2000 Series is able to effectively solve the power issues and increase the stability and safety of the gantry crane system.