1． Safely improve power factor, avoid power factor’s examination penalty from power supply department
2. Save energy and reduce consumption, reduce production power cost
3. Reduce damage from harmonic to electric device, secure the steady operation of distribution device and reactive power compensation device
4.Increase using efficiency of system capacity and distribution device
Main electric devices of wharf are: various lifting equipment, material transfer belt, site lighting device
1.Machinery continuous ship unloading machine, gantry crane, tower crane, roller belt conveyor, air cushion belt conveyor, scraper, scraper, etc. Some old devices will start the motor with reduction voltage or hard starter, some new devices drive the motor with inverter. Reduction voltage or hard starter will produce high voltage harmonic, motor with AC inverter produces large current harmonic of 5,7,9 times. The operating power factor of device is very low.
2.Wharf auxiliary devices such as motor pump, air compressor station, the power factor is very low
3.Site lighting device: as most are mercury arc lamp or sodium lamp, the lamps and high-voltage rectifier not only produce 3,5,7times harmonic, also consume much reactive power. For this, at the time of harmonic control, also should make reactive compensation.
Main electric devices of wharf are: various lifting equipment, material transfer belt, site lighting device
1.Machinery continuous ship unloading machine, gantry crane, tower crane, roller belt conveyor, air cushion belt conveyor, scraper, scraper, etc. Some old devices will start the motor with reduction voltage or hard starter, some new devices drive the motor with inverter. Reduction voltage or hard starter will produce high voltage harmonic, motor with AC inverter produces large current harmonic of 5,7,9 times. The operating power factor of device is very low.
2.Wharf auxiliary devices such as motor pump, air compressor station, the power factor is very low
3.Site lighting device: as most are mercury arc lamp or sodium lamp, the lamps and high-voltage rectifier not only produce 3,5,7times harmonic, also consume much reactive power. For this, at the time of harmonic control, also should make reactive compensation.
Suggestion is to use fast filter compensation to conduct local harmonic control and reactive power compensation:
1.Use fast filter compensation device, at the time of improving power factor, also control the 3, 5, 7, 9times current harmonic.
2.Use harmonic voltage suppressor to control 3, 5, 7, 9times harmonic voltage