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| Fault ride-through of virtual synchronous generator under voltage drop |
| DOI：10.7667/PSPC171236 |
| Key Words:virtual synchronous generator low voltage ride-through balanced current control power limit phase adjustment |
| Author Name | Affiliation | | GAO Huaizheng | College of Electric Power, Inner Mongolia University of Technology, Hohhot 010080, China | | LI Hua | College of Electric Power, Inner Mongolia University of Technology, Hohhot 010080, China | | CHANG Xing | College of Electric Power, Inner Mongolia University of Technology, Hohhot 010080, China | | LIU Jiachen | College of Electric Power, Inner Mongolia University of Technology, Hohhot 010080, China | | GUO Hefei | College of Electric Power, Inner Mongolia University of Technology, Hohhot 010080, China |
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| Abstract:According to the problem that the traditional VSG balanced current control is not able to ride through faults during the voltage drop, a Low Voltage Ride-Through (LVRT) control strategy is proposed to meet the VSG balanced current control. The basic principle of VSG balanced current control and the reason why it cannot ride through low voltage fault are analyzed, on this basis, a control method of power limit is proposed. According to the traditional LVRT current command, the power reference value is calculated. Under the premise of maintenance of VSG mechanical inertia properties, and by reducing the reactive ring inertia coefficient and maintaining active power difference, the system reactive power output rate and active adjustment time are improved during symmetrical fault, the problem of power instability during the fault release is eliminated by introducing a phase adjustment. The validity and effectiveness of this control strategy is verified by simulation results. This work is supported by Natural Science Foundation of Inner Mongolia Autonomous Region (No. 2016BS0508). |
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