Method for MGP new energy grid-connected control

A method for motor-generator pair (MGP) new energy grid-connected control, comprising:

• connecting a synchronous motor (100) to a synchronous generator (200);
• driving the synchronous motor (100) by a new energy module (400) to rotate through a frequency converter (300);
• controlling power transmission between the new energy module (400) and the synchronous motor (100) by the frequency converter (300), wherein the frequency converter (300) comprises a rectifier (301), an inverter (302), and a DC capacitor (303) arranged between the rectifier (301) and the inverter (302);
• driving the synchronous generator (200) by the synchronous motor (100) for grid connection, wherein, when the inverter (302) increases its output power and power provided by the new energy module (400) is insufficient, a charging current for the DC capacitor (303) is tuned to be less than a discharge current for the DC capacitor (303), resulting in a decrease in a voltage of the DC capacitor voltage, and wherein, when the inverter reduces its output power and the power provided by the new energy module is excessive, a charging current for the DC capacitor (303) is tuned to be greater than a discharging current for the DC capacitor (303), resulting in an increase in a voltage for the DC capacitor, and wherein if power provided by the new energy module (400) matches power transmitted by the inverter (302), a voltage for the DC capacitor (303) remains stable.