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| A novel AC voltage control strategy with inner current loop and its parameter design for a grid-forming MMC |
| DOI：10.19783/j.cnki.pspc.240774 |
| Key Words:MMC VSC-HVDC grid-forming control inner current loop AC voltage control |
| Author Name | Affiliation | | LIU Li1,2 | 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai
Jiao Tong University, Shanghai 200240, China
2. Zhoushan Power Supply Company, State Grid
Zhejiang Electric Power Corporation, Zhoushan 316000, China | | YANG Renxin1 | 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai
Jiao Tong University, Shanghai 200240, China
2. Zhoushan Power Supply Company, State Grid
Zhejiang Electric Power Corporation, Zhoushan 316000, China | | SHI Gang1 | 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai
Jiao Tong University, Shanghai 200240, China
2. Zhoushan Power Supply Company, State Grid
Zhejiang Electric Power Corporation, Zhoushan 316000, China | | ZHANG Chen1 | 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai
Jiao Tong University, Shanghai 200240, China
2. Zhoushan Power Supply Company, State Grid
Zhejiang Electric Power Corporation, Zhoushan 316000, China | | ZHANG Jianwen1 | 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai
Jiao Tong University, Shanghai 200240, China
2. Zhoushan Power Supply Company, State Grid
Zhejiang Electric Power Corporation, Zhoushan 316000, China | | CAI Xu1 | 1. Department of Electrical Engineering, School of Electronic Information and Electrical Engineering, Shanghai
Jiao Tong University, Shanghai 200240, China
2. Zhoushan Power Supply Company, State Grid
Zhejiang Electric Power Corporation, Zhoushan 316000, China |
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| Abstract:Grid-forming (GFM) control is an effective way for power electronic converters to enhance the stability of a power system dominated by renewable power sources. In high-voltage and high-power application scenarios, GFM converters usually adopt modular multilevel converter (MMC) topology. Because of the absence of a centralized filter capacitor on the MMC AC side and the difficulty in obtaining current feedforward, the performance of AC voltage-AC current cascade control loops in conventional GFM control methods may deteriorate. To address this, a novel AC voltage control strategy is proposed. While retaining the current limiting capability, the current inner loop is transformed into a controllable voltage source in series with a virtual impedance using the Thevenin-Norton equivalent, thereby achieving a terminal voltage construction mechanism similar to that of synchronous generators. Moreover, the control loops and parameters are optimized using small signal state space modelling. Finally, simulation results in PSCAD/EMTDC prove the effectiveness of the proposed strategy and parameter design method. |
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