The low voltage of the inverter mainly refers to the low voltage of the central DC circuit, and the reasons for the low voltage of the central DC circuit generally come from two aspects:
(1) Low voltage from the input side of the power supply
Under normal circumstances, the power supply voltage is 380V, the promised error is -15%-10%, and the voltage value of the central DC after the three-phase bridge full-wave rectification is 513V, and the voltage fluctuation of the power line voltage is small in a single case, and it will not cause the low voltage trip of the inverter, as long as the effective value of the grid voltage is between 80% and 85% of the rated value, and it lasts for more than one cycle, it will cause the inverter to act. The low voltage on the input side of the power supply is mainly due to the fluctuation of the grid voltage or the switching of the main power line, the amplitude of the sine wave of the power supply is affected by lightning strikes, and the transformer overload or load imbalance of the power plant itself.
(2) Low voltage from the load side
The main reasons for this are the operation and application of large equipment, overload of the line or the operation of large motors, etc. The inverter is composed of two parts: a rectifier and an inverter. Through the study of the inverter, the low voltage of the inverter refers to the low voltage of the central DC loop (that is, the input voltage of the inverter is too low). General inverters have maintenance functions of overvoltage, loss of voltage and instantaneous power failure. The inverter device of the inverter is divided into two kinds: GTR and IGBT, when the inverter device of the inverter is GTR, once the voltage is lost or the power is off, the control circuit will stop outputting the signal to the driving circuit, so that the driving circuit and GTR will all stop working, and the motor will be in a free braking state. When the inverter device is an IGBT, after the loss of voltage or power failure, the inverter will be promised to continue to work for a short time TD, if the voltage loss or power failure time TOTD, the inverter self-maintenance stop operation. Generally, the TD is in 15-25ms, and the power supply "shakes" the time to is generally more than a few seconds, and the inverter will self-maintain and stop the operation, so that the motor stops running. Therefore, to deal with the problem of low voltage tripping of the inverter, it is necessary to start from the amplitude that can withstand the voltage drop instead of the inherent time TD and the time of loss of voltage of the inverter.
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