Phase Angle Compensation of Virtual Impedance for Resonance Mitigation in DFIG System under Weak Grid

• DOI: 10.1049/cp.2019.0334
• Publication Date: 2020-03-17T20:11:35Z
• Authors: Z. Din; Jianzhong Zhang; Zheng Xu; Yaqian Zhang
• Keywords: Phase angle (astronomy)

Subsynchronous resonance (SSR) and high-frequency (HFR) occurs due to the impedance interaction between DFIG system series compensated parallel weak grid, respectively. Virtual is traditional technique of mitigation in grid-connected applications. To cope with problem that control delay would lead failure virtual impedance, this paper inaugurates model grid considering delay. Then phenomenon revealed for system. It shown fails mitigate negative damping at high frequencies. The phase shift initiated by scrutinized quantitatively, restore positive characteristics, reshaped angle compensation. Thus, more efficient can be achieved reshaping. stability proposed method analyzed, range determined. Finally, simulations MATLAB based on a 2 MW verify effectiveness method.