Analysis of Small-Disturbance Stability of Onshore Wind Power All-DC Power Generation System and Identification of Leading Factors

• DOI: 10.3390/electronics13010008
• Publication Date: 2023-12-19T11:03:11Z
• Authors: Guixin Jin; Fengting Li; Chunya Yin; Jiangshan Liu; Tao Wang
• Keywords: Low-frequency oscillation

The application of conventional AC collection for the integration large-scale renewable energy sources may lead to issues concerning harmonic resonance and reactive power transmission. Conversely, utilization an all-DC generation system wind (WDCG) can effectively circumvent such issues. In contrast system, interdependence among subsystems in WDCG renders it susceptible oscillation instability presence minor disturbances. To address this concern, paper first establishes a small-signal model WDCG, validates accuracy by comparing with electromagnetic transient based on PSCAD/EMTDC. Secondly, employing eigenvalue analysis method, principal modes are identified, state variables strongly correlated these analyzed using participation factor method. Moreover, quantitative assessment impact operational control parameters closely associated negative damper is conducted. findings reveal that small-disturbance stability significantly influenced outlet capacitance ma-chine-side converter (MSC), direct current turbine (DCWT), sub-module modular multilevel (MMC), inductance bridge arm. Additionally, al-so affected constant DC voltage DCWT side, outer-loop–current inner-loop control, circulation suppression MMC side. simulation results PSCAD validate efficacy proposed method identifying dominant factors.