The invention discloses a frequency converter safety operation area calculating method. The frequency converter safety operation area calculating method is characterized by deeply researching the internal structure of a frequency converter, performing systematic research and calculation on the rectification and inversion links in the frequency converter and the mechanical features of operation ofan external motor, and comparing the output voltage and current of the rectification link, the output voltage of the inversion link, and the rotor current and rotating speed of a three-phase asynchronous motor, obtained through calculation after performing theoretical voltage sag every time, with the parameters of the frequency converter and the three-phase asynchronous motor which can operate normally, so as to obtain a safety operation area in which the frequency converter can normally work after the whole frequency converter encounters voltage sag. On the premise of not borrowing experimental equipment, the frequency converter safety operation area calculating method takes the three links, rectification, inversion and motor operation as one integral body to consider, so as to calculatethe safety operation area of the frequency converter, and has the advantages of being high in calculating speed, being high in calculation accuracy, and not damaging the frequency converter and the motor.

Frequency converter safety operation area calculating method

The invention relates to a voltage sag simulation system and method. The system comprises a main circuit and a control circuit. The main circuit comprises a rectification unit, an inversion unit and a load; an input end of the rectification unit is connected with a power grid, an output end of the rectification unit is connected with an input end of the inversion unit, and an output end of the inversion unit is connected with the load; the control circuit comprises a control unit, a first AC voltage and current transformer, a second AC voltage and current transformer and a DC voltage transformer, and the first AC voltage and current transformer, the second AC voltage and current transformer and the DC voltage transformer are connected with the control unit; the first AC voltage and current transformer detects an AC voltage and current entering into the rectification unit, the second AC voltage and current transformer detects an AC voltage and current output by the inversion unit, and the DC voltage transformer detects a DC voltage output by the rectification unit; and the control unit controls power devices in the rectification unit and the inversion unit to be switched on and off. The voltage sag process can be accurately simulated.

Voltage sag simulation system and method

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Voltage sag simulation system and method