1. Harmonic disturbance
The rectifier circuit will produce harmonic current, this harmonic current on the impedance of the power supply system voltage drop, resulting in the voltage wavepattern distortion, this distortion of the voltage for many electronic equipment to cause disturbance (because most electronic equipment can only work under the sine wave voltage condition), the common voltage distortion is the top of the sine wave flattening. As soon as the harmonic current is punctual, the voltage distortion becomes more severe in the case of weak power supply, and the characteristic of this disturbance is that it will cause disturbance to the equipment using the same power grid, and has nothing to do with the distance between the equipment and the inverter;
2. Radio frequency conduction emission disturbance
Because the load voltage is pulsed, the current drawn by the inverter from the power grid is also pulse-shaped, and this impulse current includes a large number of high-frequency components, constituting radio frequency disturbance, and the characteristic of this disturbance is that it will constitute disturbance to the equipment using the same power grid, and has nothing to do with the distance between the equipment and the inverter;
3. Radio frequency radiation disturbance
RF radiation agitates the input and output cables from the drive. In the above-mentioned RF conducted emission disturbance situation, when there is a radio frequency disturbance current on the input and output cables of the inverter, because the cable is equivalent to an antenna, electromagnetic wave radiation will inevitably occur, and radiation disturbance will occur. The PWM voltage transmitted on the output cable of the inverter also includes abundant high-frequency components, and electromagnetic wave radiation will occur, which constitutes radiation disturbance. Radiated disturbance is characterized by the fact that when other electronic devices are in close proximity to the inverter, the phenomenon becomes severe.
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