It is understood that with the development of society and the progress of science and technology, frequency converters have developed very rapidly in recent years because of energy saving, and have been widely used. So what is the energy saving principle of the inverter?
1. Frequency conversion energy saving
The energy saving of the frequency converter is mainly reflected in the application of fans and pumps. In order to ensure the reliability of production, all kinds of production machinery have a certain surplus when they are designed with power drives. When the motor cannot run under full load, in addition to reaching the power drive requirements, the excess torque increases the active power consumption, resulting in a waste of electrical energy. The traditional speed regulation method of fans, pumps and other equipment is to adjust the air supply and water supply by adjusting the baffle and valve opening of the inlet or outlet. Its input power is large, and a large amount of energy is consumed. . When using variable frequency speed regulation, if the flow requirements are reduced, the requirements can be met by reducing the speed of the pump or fan.
According to fluid mechanics, P (power) = Q (flow) & TImes; H (pressure), the flow Q is proportional to the square of the speed N, the pressure H is proportional to the square of the speed N, and the power P is proportional to the cube of the speed N Proportionally, if the efficiency of the pump is constant, when the required flow rate is adjusted to decrease, the speed N can be reduced proportionally, and at this time the shaft output power P has a cubic relationship. That is, the relationship between the power consumption of the pump motor and the rotation speed is approximately a square ratio. When the required flow Q decreases, the output frequency of the inverter can be adjusted so that the motor speed n decreases proportionally. At this time, the power P of the motor will be greatly reduced according to the cubic relationship, saving 40% to 50% energy than adjusting the baffle and valve, so as to achieve the purpose of saving electricity.
2. Power factor compensation and energy saving
Reactive power increases line loss and equipment heating, and the main reason is that the reduction of power factor leads to the reduction of active power in the power grid. Among a large number of reactive energy consumption lines, the equipment is inefficient and the waste is serious. After using the frequency conversion speed control device, the frequency conversion The internal filter capacitor functions to reduce the reactive power loss and increase the active power of the power grid.
3. Soft start energy saving
The hard start of the motor has a serious impact on the power grid, and it also has too high requirements on the capacity of the power grid. When the start-up generates large currents and vibrations, it greatly damages the baffle and valves, which is extremely unfavorable for the service life of equipment and pipelines. After using the frequency conversion energy-saving device, the soft start function of the inverter will make the starting current start from zero, the maximum value exceeds the rated current, reducing the impact on the grid and the power supply capacity requirements, extending the service life of equipment and valves. Save the equipment maintenance costs.
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