Oscillation Suppression of Grid-Following Converters by Grid-Forming Converters with Adaptive Droop Control

Lifeng Qiu, Miaosong Gu, Zhongjiang Chen, Zhendong Du, Ligang Zhang, Wenrui Li, Jingyi Huang and Jingyang Fang ()
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Lifeng Qiu: Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd., Hangzhou 310016, China
Miaosong Gu: Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd., Hangzhou 310016, China
Zhongjiang Chen: Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd., Hangzhou 310016, China
Zhendong Du: Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd., Hangzhou 310016, China
Ligang Zhang: Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd., Hangzhou 310016, China
Wenrui Li: School of Control Science and Engineering, Shandong University, Jinan 250061, China
Jingyi Huang: School of Control Science and Engineering, Shandong University, Jinan 250061, China
Jingyang Fang: School of Control Science and Engineering, Shandong University, Jinan 250061, China

Energies, 2024, vol. 17, issue 20, 1-14

Abstract: The high penetration of renewable energy sources (RESs) and power electronics devices has led to a continuous decline in power system stability. Due to the instability of grid-following converters (GFLCs) in weak grids, the grid-forming converters (GFMCs) have gained widespread attention featuring their flexible frequency and voltage regulation capabilities, as well as the satisfactory grid-supporting services, such as inertia and damping, et al. Notably, the risk of wideband oscillations in modern power grids is increasingly exacerbated by the reduced number of synchronous generators (SGs). Thus, the wideband oscillation suppression method based on adaptive active power droop control of GFMCs is presented in this paper. First, the stability of the hybrid grid-forming and grid-following system is obtained according to the improved short circuit ratio (ISCR), where the GFMC is in parallel at the point of common coupling (PCC) of the GFLC. Then, an adaptive adjustment strategy of the active power droop control is proposed to enhance the oscillation suppression capability across the full frequency range, thereby mitigating the wideband oscillation caused by phase-locked loop (PLL) synchronization in the GFLCs. Additionally, a first-order inertia control unit is added to the active and reactive power droop controllers to mitigate frequency and voltage variations as well as suppress potential mid-to-high frequency resonance. Finally, the wideband oscillation suppression strategy is validated by the simulation and experimental results.

Keywords: grid-forming; grid-following; phase-locked loop (PLL); voltage inertia; wideband oscillation suppression (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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