Transient Synchronous Stability Analysis of Grid-Following Converter Considering Outer-Loop Control with Current Limiting
Abstract
:1. Introduction
2. Transient Synchronization Modeling of VSC
2.1. Second-Order Synchronization Model of VSC
2.2. Outer-Loop Control of VSC
3. The Necessity of Considering Outer-Loop Control
4. Synchronous Stability of VSC Considering Outer-Loop Control
4.1. Synchronization Equation of PLL
4.2. SEP Analysis
4.3. Effect of Outer-Loop Control on the Synchronization Process
- (1)
- Slight drop in grid voltage
- (2)
- Moderate drop in grid voltage
- (3)
- Severe drop in grid voltage
5. Case Study
5.1. Impact of Outer-Loop Control on the Transient Synchronization Stability of VSC
5.2. Changes in SEP
5.3. System Dynamics Considering Outer-Loop Control
5.4. Impact of Current Saturation Limits
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Outer-Loop Control | Changes in the PLL Equation | Changes in SEP | Transient Synchronization Stability |
---|---|---|---|
Constant DC voltage control and constant reactive power control | Unchanged | Unchanged | The system achieves synchronization under active power constraint and reactive power constraint. |
Current-limiting control and constant reactive power control | Unchanged | Unchanged | The system achieves synchronization under reactive power constraint and current limiting constraint. |
Current-limiting control | Changed | Changed | If , the system operates under current limit constraints, there is a risk of instability, and the stability decreases with the increase in . |
, the absence of SEP, synchronous instability. |
Parameter | Value (in pu If Not Specified) |
---|---|
Rated active power Pn | 2 MW |
Reference AC voltage Un | 230 kV |
Reference frequency fn | 50 Hz |
Rated DC voltage Vdc | 1.45 kV |
DC capacity Cdc | 0.015 F |
Filter inductance Lf | 0.44 |
Grid inductance Lg | 0.36 |
Grid resistance Rg | 0.08 |
DC voltage control coefficient | Kpdc = 1, Kidc = 50 |
Reactive power control coefficient | KpQ = 1, KiQ = 50 |
Current control coefficient | Kpi = 1, Kii = 20 |
PLL control coefficient | Kppll = 50, Kipll = 100 |
Current Saturation Limit/pu | Critical Grid Voltage Drop Amplitude/pu |
---|---|
1.0 | 0.86 |
1.2 | 0.85 |
1.4 | 0.83 |
1.6 | 0.80 |
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Share and Cite
Chen, L.; Zhu, L.; Liu, Y.; Ye, N.; Hu, Y.; Guan, L. Transient Synchronous Stability Analysis of Grid-Following Converter Considering Outer-Loop Control with Current Limiting. Electronics 2024, 13, 3337. https://doi.org/10.3390/electronics13163337
Chen L, Zhu L, Liu Y, Ye N, Hu Y, Guan L. Transient Synchronous Stability Analysis of Grid-Following Converter Considering Outer-Loop Control with Current Limiting. Electronics. 2024; 13(16):3337. https://doi.org/10.3390/electronics13163337
Chicago/Turabian StyleChen, Leke, Lin Zhu, Yang Liu, Nan Ye, Yonghao Hu, and Lin Guan. 2024. "Transient Synchronous Stability Analysis of Grid-Following Converter Considering Outer-Loop Control with Current Limiting" Electronics 13, no. 16: 3337. https://doi.org/10.3390/electronics13163337