Journal
IEEE TRANSACTIONS ON ENERGY CONVERSION
Volume 36, Issue 1, Pages 218-229Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2020.3011203
Keywords
Damping; Power system stability; Stability analysis; Synchronization; Mathematical model; Transient analysis; Phase locked loops; Damping ratio; Grid fault; Phase-locked loop; Transient stability; Voltage source converters
Funding
- Joint Research Fund in Smart Grid under National Natural Science Foundation of China (NSFC) [U1966208]
- Joint Research Fund in Smart Grid under State Grid Corporation of China (SGCC) [U1966208]
- National Natural Science Foundation ofChina (NSFC) [51977019]
- 111 Project of China [B18062]
- National Key Research Development Program of China [2017YFB0902000]
- State Grid Chongqing Electric Power Company [52202319004G]
Ask authors/readers for more resources
This article investigates the transient synchronization process of grid-connected voltage source converters (VSC), focusing on the VSC's damping ratio, control parameters, operation status, PLL parameters, and voltage dips degree influence on the equivalent power angle (EPA) and frequency behavior. An improved PLL is proposed to adaptively adjust the VSC's damping ratio for different voltage sags, reducing overshoot and oscillation, and validating the effectiveness of the theoretical analysis through simulations and experimental tests.
In this article, the transient synchronization process of the grid-connected voltage source converters (VSC) is studied detailly. Firstly, the phase-locked loop (PLL)-synchronized VSC is modeled according to the rotor motion equation of synchronous generator (SG). Furthermore, the VSC's damping ratio is derived, and the effects of the VSC's control parameters and the operation status on the equivalent power angle (EPA) is investigated. Moreover, the influence of the PLL's parameters and the voltage dips degree on the VSC's transient frequency behavior are analyzed. Analysis result reveals that the VSC's damping ratio decreases once the grid voltage drops, so that the EPA and frequency of the VSC may appear large overshoot and oscillation, which may trigger the frequency protection and deteriorate the VSC's transient stability. In order to ensure that the VSC can smoothly operate to new equilibrium points, an improved PLL is proposed, which can adaptively adjust the VSC's damping ratio for different voltage sags. The proposed method can not only reduce the overshoot of the EPA but also restrain the VSC's frequency dips degree. Finally, the simulations and experimental tests validate the effectiveness of the theoretical analysis.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available