Frequency conversion energy saving

Inverter energy saving 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 consumption of active power, 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 opening and closing of the baffle and valve of the inlet or outlet. Its input power is large, and a large amount of energy is consumed in the blocking process of the baffle and valve. in. 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.

The function of the frequency converter of the motor is to adjust the speed and reduce the starting current. In order to generate a variable voltage and frequency, the device must first convert the alternating current of the power supply to direct current (DC). This process is called rectification. The device that converts direct current (DC) into alternating current (AC) has the scientific term "inverter". The general inverter is an inverter power supply that inverts the DC power supply to a certain fixed frequency and a certain voltage. For inverters with adjustable frequency and adjustable voltage, we call them inverters. The output waveform of the frequency converter is an analog sine wave, which is mainly used in the speed regulation of three-phase asynchronous motor, also called frequency conversion speed regulator. For variable frequency inverters that are mainly used in the testing equipment of instrumentation and waveforms, which require higher waveforms, the waveforms should be sorted out and can output standard sine waves, called variable frequency power supplies. The frequency conversion power supply is 15-20 times the price of the inverter. Because the main device that produces a changing voltage or frequency in the inverter device is called "inverter", the product itself is named "inverter", that is, an inverter.

Frequency conversion is not everywhere to save power. In many occasions, using frequency conversion may not necessarily save power. As an electronic circuit, the inverter itself also consumes power (about 3-5% of rated power). The power consumption of a 1.5 hp air conditioner is 20-30W, which is equivalent to a long light. The frequency converter runs at the power frequency and has the power saving function, which is a fact. But his prerequisites are:

First, high power and fan/pump load;

Second, the device itself has a power saving function (software support);

These are the three conditions that reflect the power saving effect. Other than that, it doesn’t matter if it doesn’t save electricity, it doesn’t make much sense. If there is no precondition to say that the power frequency operation of the inverter is energy-saving, it is exaggeration or commercial hype. Knowing the whole story, you will use him skillfully to serve you. It is necessary to pay attention to the occasion and conditions of use in order to correctly apply, otherwise it is blind obedience, credulity and "fraud".

Power factor compensation energy saving

Reactive power not only increases line loss and equipment heating, but more importantly, the reduction in power factor leads to a reduction in the active power of the power grid. A large amount of reactive energy is consumed in the line. The equipment is inefficient and wastes a lot. Use frequency conversion speed regulation devices Afterwards, due to the role of the internal filter capacitor of the inverter, the reactive power loss is reduced and the active power of the power grid is increased.

Soft start energy saving

1: 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. The large current generated during start-up and the damage to the baffle and valves during vibration are extremely great, and the service life of equipment and pipelines is extremely high. unfavorable. After using the frequency conversion energy-saving device, the soft start function of the inverter will make the starting current start from zero, and the maximum value will not exceed the rated current, which reduces the impact on the power grid and the power supply capacity requirements, and extends the use of equipment and valves life. Save the equipment maintenance costs.

2: In theory, the frequency converter can be used in all mechanical equipment with a motor. When the motor is started, the current will be 5-6 times higher than the rated value, which will not only affect the service life of the motor but also consume more power. .When designing the system, there will be a certain margin in the selection of the motor, the speed of the motor is fixed, but in actual use, sometimes it needs to run at a lower or higher speed, so the frequency conversion transformation is It is very necessary. The frequency converter can realize the soft start of the motor and compensate the power factor