Hybrid synchronous network construction converter control method based on virtual admittance optimization design and related device

By adopting a hybrid synchronous grid-type converter control method based on virtual admission optimization design under weak grid conditions, the problem of low steady-state stability of the grid-connected inverter is solved, and the frequency support and fault recovery stability of the system are achieved.

CN119696067AActive Publication Date: 2025-03-25HEFEI UNIV OF TECH +1
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Patent Information

Application Number
CN202411610478.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-12
Publication Date
2025-03-25
Estimated Expiration
2044-11-12

AI Technical Summary

Technical Problem

Under weak grid conditions, the grid-connected inverter of the new energy power generation system has low steady state stability, resulting in a decrease in the stability margin of the system and threatening the safe and stable operation of the power system.

Method used

The hybrid synchronous network inverter control method based on virtual admission optimization design is adopted. By calculating the instantaneous active power output by the system and the acquired active command value, the hybrid synchronization control angle is obtained, and the voltage support characteristics of the network inverter are improved through virtual admission control.

Benefits of technology

It significantly improves the steady-state stability of grid-connected inverters under weak grids, and enhances the frequency support characteristics and fault recovery stability of the system.

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Abstract

The embodiment of the invention discloses a hybrid synchronous networking converter control method based on virtual admittance optimization design and a related device. The method comprises the following steps: calculating instantaneous active power output by a system according to two-phase current of an output filter inductor and two-phase voltage of a power grid side capacitor; inputting the instantaneous active power and the obtained active instruction value into a power synchronization control loop and a phase-locked loop to obtain a hybrid synchronization control angle; inputting the two-phase voltage of the power grid side capacitor into the virtual admittance to obtain a two-phase reference current value; inputting the two-phase current of the output filter inductor, the two-phase voltage of the power grid side capacitor and the two-phase reference current value into an alternating current control loop to obtain a two-phase voltage control signal of the inverter; finally, converting the two-phase voltage control signal according to the mixed synchronous control angle to obtain a three-phase voltage control signal; and controlling on and off of the power device according to the three-phase voltage control signal. According to the invention, the steady-state stability of the grid-connected inverter under the weak power grid can be improved.
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