Application and research of frequency converter in energy-saving retrofit of air compressor Feng Haoyuan of Wenhu Hunan Hengkai Environmental Protection Technology Investment Co., Ltd. With the rapid development of power electronics technology, the use of frequency converter in the field of speed regulation is more and more extensive. It has an air compressor as the main body in the air source device and 15 is the power consumption of the compressed air electric equipment. Therefore, it is very important to use the modified air compressor as the key point of energy saving and emission reduction.
The common air compressor system has a large starting current impact and cannot be started frequently. In the original system, the main motor was started by using a step-down starting method. However, because the air compressor has a very large power of 75 kW, its starting current is 4, 5 times the rated current, about 7504. Therefore, in the case of power frequency operation, the air compressor is not allowed to start frequently.
The main motor is often operated at no load, which is non-economical operation and wastes power.
The main motor power frequency operation causes the air compressor to operate with a lot of noise.
The main motor power frequency start has a large impact on the equipment, and the motor bearing wears a large amount, so the equipment maintenance workload is large.
The inverter air compressor system control scheme is based on the existing air compressor operating conditions and combined with the production process requirements. The inverter air compressor system can meet the following requirements. The motor frequency conversion operation state keeps the gas tank outlet pressure stable and the pressure fluctuation range is controlled. In ±0.0213. In the mode of power frequency operation, the pressure of the pressure tank controlled by the air volume control and the rebound pressure control is still relatively rough and often fluctuates, which will affect the end user. usage of.
The variable frequency air compressor is used to change the running speed, because the air compressor can smoothly control the air supply quantity, the pressure fluctuation control is more precise, and the end user can obtain a more stable air pressure.
The system has two sets of control loops, open loop and closed loop. The inverter air compressor control system has two control modes, namely open loop closed loop. In the normal state, the closed loop control mode can be utilized, and the system will automatically control the operating speed of the variable frequency air compressor according to the pressure of the compressed air in the pressure storage tank, thereby controlling the air supply volume of the air compressor. When the system is faulty, or when the pressure sensor fails, it can be switched to the open loop operation, directly giving the operating speed of the air compressor, so that the operating condition of the air compressor and the air supply speed can be manually controlled.
The inverter can control multiple air compressors and can be switched by the transfer switch. In this system, only the inverter is only required, but the air compressor can be selected for dragging. In other words, it is possible to use multiple air compressors in a variable frequency system. In this way, when the air compressor needs to be repaired or replaced, it can be easily switched to another air compressor variable frequency operation.
Reliable switching. The frequency conversion system simultaneously controls the usage of multiple air compressors, and automatically starts or stops the air compressor used by the power frequency.
In order to ensure reliable judgment and switching air compressor operation, the system sets three hysteresis control to ensure reliable switching and prevent repeated switching of air compressor frequency conversion control system. The air compressor constant pressure air supply intelligent control system is based on pressure sensor detection. The pressure value of the air compressor outlet is passed, the working state of the compressor motor is adjusted, the pressure of the compressor outlet is accurately controlled, the service life of the compressor system is prolonged, and the safety protection function is improved.
Zero-gas volume automatic shutdown function.
The upper computer interface is characterized by simpler settings and more intuitive monitoring.
The alarm signal is displayed in Chinese.
The host computer interface contains key parameter automatic recording function.
The key parameters are set directly in the host computer interface.
Analysis of energy saving effect The method of adjusting the motor speed can also adjust the air supply amount. Since the air compressor basically belongs to the constant torque load, adjusting the air supply amount by the frequency conversion speed regulation method can make the output power of the motor basically proportional to the air supply volume of the rotation speed, and achieve a good power saving effect. The two adjustment methods use electricity.
The red-introduction method uses the power of the cheek speed control method. The inverter with the vector control function can provide the motor with the torque required to meet the load at low speed. At the same time, the automatic energy-saving mode of the inverter enables the motor to run at the minimum current under the load torque requirement, achieving better power saving effect.
The use effect of the frequency converter can be mainly divided into the following two aspects: the air outlet release valve is completely closed, and the air outlet release valve is used to adjust the air supply quantity mode to avoid the waste of electric energy caused thereby. The frequency of the motor is adjusted by the frequency converter to adjust the gas flow rate, so that the output power of the motor is basically proportional to the flow demand, and the motor is always operated with high efficiency to achieve a significant power saving effect.
Reduce equipment wear, equipment operation, increase the frequency conversion control system, achieve stepless speed regulation, can automatically adjust the output of the air compressor according to the power demand of the load demand, the valve action of the air compressor is significantly reduced, and there is no frequent shutdown phenomenon. The system is running a lot more stable.
In short, the use of constant pressure air supply intelligent control system can not only save 30, 40 power costs, extend the service life of the compressor, but also achieve the purpose of constant pressure gas supply, improve production efficiency and product quality.
Saving energy in a measure of magnitude.
In order to reliably avoid the tolerance control, a solenoid valve is installed in the air source part of the tolerance control system, and according to the selection of the frequency conversion operation and the operating state of the system, it is automatically judged whether the tolerance is cut into operation.
The system will pass, 0 collect the pressure in the pressure tank, and the output pressure of the unit, and automatically control the frequency of the inverter through calculation, thus controlling the power of the air compressor and the air supply volume of the air compressor.
The control between the air compressor unit is a comprehensive automatic frequency conversion operation of the air compressor station. Therefore, the system not only controls the speed of the air compressor, but also automatically controls the air pressure according to the external air pressure. The operation of the power frequency spare air compressor. When the amount of air used by the outside increases, the system will automatically increase the frequency. When the frequency reaches the maximum and the pressure is still not met, the system will automatically delay the start of another power frequency air compressor while still operating at constant pressure. When the external air consumption decreases, the system will automatically reduce the frequency. When the frequency reaches the minimum, the pressure is still too high, the system will delay the power frequency operation of the air compressor, and the air compressor of the variable frequency operation will still operate at constant pressure. In order to ensure the accuracy and reliability of the switching, the system sets three hysteresis controls to ensure the stability and reliability of the switching process.
The system adopts a structure of power frequency frequency conversion interlocking.
The system uses a large inertia, 10 control algorithm to achieve pressure without static control. The compressed air output from the air compressor system first enters the gas storage tank, which can store the energy of the air pressure, so that the pressure changes smoothly. However, the presence of the gas tank will cause the inertia of the system feedback to be greatly increased, making the system a large inertia control system. The large inertia control system uses ordinary, control will likely lead to a series of ills such as system overshoot and severe oscillation amplitude and system instability. Therefore, in this program, a special large inertia and control system are adopted, which greatly reduces the occurrence of system overshoot and enhances the stability of the system.
The system uses intelligent control to achieve time-divided pressure control. The system can achieve time-phase control according to customer requirements. It means that the pressure setting of the system is no longer a simple set value, but a pressure curve set according to the daily gas consumption. After the pressure curve is determined, the system will follow the preset pressure according to the internal real time clock. The curve runs automatically.
Automatically divided into multiple segments of up to 5 segments, the start time and end time of each segment can be set manually; each segment can set a pressure setting value, so that the low-peak period of the regional gas can be compared Under low pressure, the opposite phase of the gas peak period can be operated at higher pressure.
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