A. Problems in the original system of normal screw air compressor:
1. Although the main motor is decompressed at the star-angle, the current at the start is still large, which will affect the stability of the power grid and the safe operation of other electrical equipment.
2. The main motor is often operated at no load, which is non-economical operation and wastes power.
3. The main motor power frequency operation causes the air compressor to operate with a lot of noise.
4. The impact of the main motor power frequency starting equipment is large, and the wear of the motor bearing is large, so the mechanical quantity is large when the equipment is maintained.
B. Frequency conversion transformation plan:
First, the design principle of frequency conversion transformation plan.
According to the problems existing in the original working conditions and combined with the requirements of the production process, the system of the screw air compressor after the frequency conversion transformation should meet the following requirements:
1. The variable frequency operation state of the motor keeps the outlet pressure of the gas storage tank stable, and the pressure fluctuation range cannot exceed ±0.02Mpa.
2. The system should have two sets of control loops for frequency conversion and power frequency.
3. The system has two sets of control loops, open loop and closed loop.
4. One inverter can control two screw air compressor units, which can be switched by the transfer switch.
5. According to the working conditions of the air compressor, the system should ensure that the motor has constant torque operating characteristics.
6. In order to prevent non-sinusoidal interference from the screw air compressor controller, the input end of the inverter should have effective measures to suppress electromagnetic interference.
7. When the electric quantity is small, when the inverter is running at low frequency, the motor winding temperature and motor noise should be guaranteed to not exceed the allowable range.
8. In consideration of the future expansion of the system, the inverter should meet the requirements for future expansion of the operating conditions.
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