The ubiquity of AC drives brings significant energy savings to industrial applications. However, the high-frequency switching signal generated by the inverter is easy to form electromagnetic disturbance, which affects the power quality. It is especially significant in occupations with large loads such as lifting and elevators.
At this time, Delta's active front-end products, an excellent partner of the inverter, are needed.
Through real-time three-phase current monitoring and active compensation, it can greatly eliminate the harmonics generated by the inverter, effectively improve the system power, and feed back the recovery energy of the four-quadrant operation of the inverter to the power grid for reuse, so as to complete a higher level of system stability and energy saving and consumption reduction.
A well-known power plant in central China, which uses waterways for frequent material transportation, has recently added two floating crane vessels to meet the high-load power generation demand in central China.
Floating crane vessels are lightweight, occupy a small area, and work sensitively, but they also consume a lot of energy while producing high power. To this end, the power plant selected Delta's active front-end AFE2000 series to carry out energy-saving transformation for the frequency conversion system of floating crane ships, which has achieved remarkable results.
In the operation of the floating crane ship, when the unloaded hook rises or the hook loaded with goods falls, the motor is driven to run into a generator condition, and the system will generate electricity. When the energy feedback unit is not installed, the regenerative power is consumed by the braking unit to convert the electrical energy into heat energy. Not only does this method not make full use of the energy, but the thermal energy generated by the braking unit will also cause the temperature of the machine room to rise, add the load of the air conditioning system, and even affect the life of the machine.
In order to improve energy utilization and service life of the machines, Delta has installed an active front-end AFE2000 series on the two lifting motors of the floating crane vessels of the power plant, and when the system generates generated electricity, the electric energy generated by the motors is fed back to the grid through the AFE2000 series to complete energy reuse.
According to the actual measurement of the system, when the AFE2000 series is not installed, the power consumption for a product handling is 33.7kWh, and the feedback power is 0kWh, and after the installation of the AFE2000 series, the system consumes 32.15kWh, but the other 9.36kWh of electricity is fed back to the grid for reuse, which is equivalent to 29% of the power saving, which is a very significant achievement.
In addition, the active filtering function of the AFE2000 series can correct the distortion wave generated by the inverter to a normal sine wave, reduce the total harmonic distortion rate (THD) of up to 26% in the original system to less than 5%, and adjust the power factor to more than 99%, greatly reducing the virtual power and increasing the power consumption.
By selecting Delta's active front-end AFE2000 series, the power plant successfully renovated its two new floating crane vessels for energy conservation, which not only achieved good energy-saving results and reduced costs, but also set a good example of environmental protection in the trend of energy conservation and carbon reduction.
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