Transient Stability Analysis and Control Design of Droop-Controlled Voltage Source Converters Considering Current Limitation

By Linbin Huang, Huanhai Xin, Zhen Wang, Leiqi Zhang, Kuayu Wu, Jiabing Hu. IEEE Transactions on Smart Grid, 2019

433 citations recorded by the source corpus.

In the modern power grid, distributed generators are widely connected to the grid via voltage source converters (VSCs). Analyzing the transient stability of VSCs under large disturbances is useful for maintaining the security of the grid. However, this topic is very little studied. In this paper, the transient stability behavior of the droop-controlled VSC is theoretically explained. In particular, it is shown that transient instability can occur to the droop-controlled VSC when its current is saturated under large disturbances. In addition, the dynamics of the VSC under voltage sags that could incur instability problem is elaborately studied to consider special non-fault disturbances. To deal with this instability problem, a stability enhanced P-f droop control is proposed. Simulations and hardware-in-the-loop experiments verify the validity of the transient stability analysis and the effectiveness of the proposed control scheme.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/60c946069bef2413f66f07aa7c10a18dc904d315

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Citations in the corpus

Current Limiting Control With Enhanced Dynamics of Grid-Forming Converters During Fault Conditions (2020, methodology): “As described in [17], [18], there are mainly two methods which can provide current limitation and stability for grid-”
Foundations and Challenges of Low-Inertia Systems (Invited Paper) (2018, background): “[134], [135] for the case of droop control.”
Grid-Synchronization Stability of Converter-Based Resources—An Overview (2020, background): “will be operated in the current limiting control mode, and its synchronization can be realized by the backup PLL [10], or still based on the APC [84].”
Transient Angle Stability of Virtual Synchronous Generators Using Lyapunov’s Direct Method (2019, background): “The effect of the current limiter on the transient instability mechanism of droop-controlled inverters was analyzed in [17] and [18].”
Power System Stability With a High Penetration of Inverter-Based Resources (2023, background): “Consequently, the synchronization mechanism should also be switched to a PLL temporarily to maintain angle stability [48] or should simply freeze temporarily at a constant frequency.”
Transient Stability of Voltage-Source Converters With Grid-Forming Control: A Design-Oriented Study (2020, background): “In [23] and [24], a transient instability phenomenon of a basic droop-controlled VSC was found in the case of a current saturation due to the grid voltage sag.”
Grid Forming Inverter Modeling, Control, and Applications (2021, background): “curves, as mentioned in [119], might occur when the current saturates.”
Describing Function Method Based Power Oscillation Analysis of LCL-Filtered Single-Stage PV Generators Connected to Weak Grid (2019, neutral): “the quasistatic transient stability analysis is conducted in [19] and [20].”