The influence of the carrier frequency of the inverter and the setting standard

1. Overview of low frequency inverter carrier frequency

For inverters with voltage ≤500V, almost all of the main circuits of AC-DC-AC are used today. The control mode also uses sinusoidal pulse width modulation (SPWM). Its carrier frequency is adjustable, generally from 1-15 kHz. Artificial selection. but

In actual use, many users only follow the original set value of the inverter manufacturing unit, and do not adjust according to the actual situation on site. As a result, the carrier frequency value is improperly selected, and the effect is correct and the effective working state is felt. How to correctly select the carrier frequency value of the inverter during the use of the inverter is also important. This article provides a basis for considering the following aspects and selecting the carrier frequency value correctly.

2, carrier frequency and inverter power consumption

The power loss of the power module IGBT is related to the carrier frequency, and the carrier frequency increases, the power loss increases, such that the efficiency is reduced, and the second is that the power module generates heat, which is unfavorable to the operation, of course, the operating voltage of the inverter The higher the impact, the greater the power loss. The larger the carrier frequency, the greater the loss of the inverter and the smaller the output power. If the ambient temperature is high, the dead zone of the upper and lower inverter tubes of the inverter bridge will become smaller during the alternate conduction process. In severe cases, the bridge arm may be short-circuited and damage the inverter.

3, carrier frequency and ambient temperature

When the frequency converter requires high carrier frequency and the ambient temperature is high, it is very unfavorable for the power module. At this time, the frequency of the carrier frequency of the different power inverters and the ambient temperature are used. The size and the allowable constant output current of the inverter should be appropriately reduced to ensure safe, reliable and long-term operation of the power module IGBT.

4, carrier frequency and motor power

If the motor power is large, the relative carrier frequency is lower. The purpose is to reduce the interference (the effect on the use of other equipment). Generally, this principle is followed, but the specific values ​​of different manufacturers are different. For example, Japan has the following relationship for reference carrier frequency 15 kHz 10 kHz 5 kHz

Motor frequency ≤30kW37-100kW185-300kW, Finland VACON carrier frequency 1-16kHz1-6kHz motor power ≤90kW110-1500kW, Shenzhen Ansheng (formerly Huawei) carrier frequency 6kHz3kHz1kHz

Motor power 5.5-22kW30-55kW75-200kW

For example, Chengdu Jialing Company JP6C-T9 Series

Carrier frequency 2-6kHz2-4kHz

Motor power 0.75-55kW75-630kW

5, carrier frequency and the secondary output (U, V, W) length of the inverter

Carrier frequency 15kHz10kHz5kHz1kHz

Line length "50M" 50-100M "100-150M" 150-200M

6. Influence of carrier frequency on inverter output current

It is well known that the inverter (DC/AC conversion) part of the inverter is a sinusoidal current waveform formed by the IGBT through a sinusoidal pulse width modulation SPWM through the motor winding. Then the size of the carrier frequency, directly affects the quality of the current waveform, and the size of the interference, and the carrier frequency is relatively sensitive and direct, so in the operation process, the carrier frequency value must be correctly selected first, and then Consider adding various kinds of harmonic suppression devices, such as AC reactors, DC reactors, filters, and other reactors, as well as installation wiring and grounding. This kind of processing is more reasonable and more effective, and must not be inverted. To deal with problems, this is a very important principle. When the carrier frequency is high, the current waveform is sinusoidal and smooth. Such harmonics are small, the interference is small, and vice versa. When the carrier frequency is too low, the effective torque of the motor is reduced, the loss is increased, and the temperature is increased. On the contrary, when the carrier frequency is too high, the loss of the inverter itself is increased. The IGBT temperature rises, and the rate of change dv/dt of the output voltage increases, which has a great influence on the motor insulation.

(1) The higher the operating frequency, the larger the duty cycle of the voltage wave, and the smaller the current harmonic component, that is, the higher the carrier frequency, the better the smoothness of the current waveform;

(2) The higher the carrier frequency, the smaller the current allowed by the inverter;

(3) The higher the carrier frequency, the smaller the capacitive reactance of the wiring capacitor (because Xc = 1/2Ï€fC), and the larger the leakage current caused by the high frequency pulse.

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