A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Enhanced AC Fault Ride-through Control for MMC-integrated System Based on Active PCC Voltage Drop
When a renewable energy station (RES) connects to the rectifier station (RS) of a modular multilevel converter-based high-voltage direct current (MMC-HVDC) system, the voltage at the point of common coupling (PCC) is determined by RS control methods. For example, RS control may become saturated under fault, and causes the RS to change from an equivalent voltage source to an equivalent current source, making fault analysis more complicated. In addition, the grid code of the fault ride-through (FRT) requires the RES to output current according to its terminal voltage. This changes the fault point voltage and leads to RES voltage regulation and current redistribution, resulting in fault response interactions. To address these issues, this study describes how an MMC-integrated system has five operation modes and three common characteristics under the duration of the fault. The study also reveals several instances of RS performance degradation such as AC voltage loop saturation, and shows that RS power reversal can be significantly improved. An enhanced AC FRT control method is proposed to achieve controllable PCC voltage and continuous power transmission by actively reducing the PCC voltage amplitude. The robustness of the method is theoretically proven under parameter variation and operation mode switching. Finally, the feasibility of the proposed method is verified through MAT-LAB/Simulink results.
Enhanced AC Fault Ride-through Control for MMC-integrated System Based on Active PCC Voltage Drop
When a renewable energy station (RES) connects to the rectifier station (RS) of a modular multilevel converter-based high-voltage direct current (MMC-HVDC) system, the voltage at the point of common coupling (PCC) is determined by RS control methods. For example, RS control may become saturated under fault, and causes the RS to change from an equivalent voltage source to an equivalent current source, making fault analysis more complicated. In addition, the grid code of the fault ride-through (FRT) requires the RES to output current according to its terminal voltage. This changes the fault point voltage and leads to RES voltage regulation and current redistribution, resulting in fault response interactions. To address these issues, this study describes how an MMC-integrated system has five operation modes and three common characteristics under the duration of the fault. The study also reveals several instances of RS performance degradation such as AC voltage loop saturation, and shows that RS power reversal can be significantly improved. An enhanced AC FRT control method is proposed to achieve controllable PCC voltage and continuous power transmission by actively reducing the PCC voltage amplitude. The robustness of the method is theoretically proven under parameter variation and operation mode switching. Finally, the feasibility of the proposed method is verified through MAT-LAB/Simulink results.
Enhanced AC Fault Ride-through Control for MMC-integrated System Based on Active PCC Voltage Drop
Haihan Ye (author) / Wu Chen (author) / Heng Wu (author) / Wu Cao (author) / Guoqing He (author) / Guanghui Li (author)
2023
Article (Journal)
Electronic Resource
Unknown
Modular multilevel converter-based high-voltage direct current (MMC-HVDC) system , fault ride-through (FRT) , voltage loop saturation , continuous power transmission , point of common coupling (PCC) , active voltage drop control , Production of electric energy or power. Powerplants. Central stations , TK1001-1841 , Renewable energy sources , TJ807-830
Metadata by DOAJ is licensed under CC BY-SA 1.0
Fault ride-through of renewable energy conversion systems during voltage recovery
| DOAJ | 2016
An Enhanced AC Fault Ride through Scheme for Offshore Wind-Based MMC-HVDC System
| DOAJ | 2023