1. Dealing with harmonic problems
The treatment of harmonic problems is to block the propagation path of the disturbance and press the higher harmonics on the source of the disturbance.
Interception of the transmission of disturbances can be carried out in the following ways:
1) Intercept the path of propagation and disturbance of the common grounding wire, the grounding of the power line and the grounding of the control wire should be separated, the grounding terminal of the power equipment should be connected to the grounding wire, and the grounding terminal of the control equipment should be connected to the metal shell of the equipment disk.
2) The wire wiring separation of the signal line away from the disturbance source current is effective in eliminating this disturbance, that is, the high-voltage cable, power cable, control cable and instrument cable, computer cable are separated from the wiring.
The methods of suppressing the higher harmonics on the disturbance source are:
1) Increase the internal impedance of the power supply of the inverterThe internal impedance of the general power supply equipment can play a role in buffering the reactive power of the DC filter capacitor of the inverter, the larger the internal impedance, the smaller the harmonic content, and the internal impedance is the short-circuit impedance of the transformer. Therefore, when selecting the power supply of the inverter, it is best to choose a transformer with a large short-circuit impedance.
2) The filter of the device is equipped with an LC type passive filter in front of the inverter to filter out the higher harmonics, generally the 5th and 7th harmonics.
3) The device reactor is installed on the front side of the inverter, and the overvoltage on the power supply side can be pressed.
4) Set the active filter The active filter automatically generates a current with the same amplitude and opposite phase as the harmonic current, and then can effectively absorb the harmonic current.
2. Dealing with noise and oscillation
1) When the weight of the lower harmonic in the output of the inverter resonates with the natural mechanical frequency of the rotor, the noise increases; When the weight of the higher harmonics in the output of the inverter resonates with the core, casing, bearing frame, etc., near their respective natural frequencies, the noise increases.
The noise, especially the sharp noise, generated by the inverter drive motor is related to the switching frequency of PWM operation, especially in the low frequency region. To deal with this problem, the communication reactor is generally connected on the output side of the inverter. If there is a margin for electromagnetic torque, the u/f can be set smaller to smooth out and reduce noise.
2) When the inverter is working, the magnetic field caused by the higher harmonics in the output waveform will cause electromagnetic force to many mechanical parts, and the frequency of the driving force will resonate when it is close to or coincides with the natural frequency of these mechanical parts. The lower harmonic weight has a great influence on the oscillation, and it has a greater influence on the PAM method and the square wave PWM method. However, when the SPWM method is selected, the weight of the lower harmonics is small, and the influence is also smaller.
The way to mitigate or eliminate the oscillation is to connect a human reactor on the output side of the inverter to absorb the higher harmonic current components in the output current of the inverter. When choosing a frequency converter with PAM method or square wave PWM method, you can use the SPWM method frequency converter to reduce the ripple torque, which can weaken or eliminate the oscillation and avoid the mechanical part being damaged by the oscillation.
3. Deal with the problem of fever
The operating environment temperature of the general-purpose inverter is generally required to be -l0°C-+50°C. In order to ensure that the inverter works reliably and prolongs the service life of the inverter, it is necessary to dissipate heat from the inverter. In winter, the built-in fan of the inverter can be used to take away the heat inside the inverter box; In summer, the temperature itself is 40 °C, and the internal heat taken away by the built-in fan of the inverter can only increase the temperature of the room and the inverter box, so the best way is to use a window or make a few holes of φ500mm evenly and appropriately in the wall of the inverter box in the distribution room to ensure that there is a certain space around the inverter in the control cabinet to maintain good natural ventilation. If this is not possible, you can turn on the electric fan, or install an exhaust fan and air duct at the hole to force the heat generated by the inverter out of the outside. Finally, air conditioning can be considered to force cooling the space environment of the inverter.
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