Abstract
Recently, sub-synchronous oscillation (SSO) issues were observed in direct-drive permanent magnet synchronous generator (D-PMSG) based wind power generation systems (WPGS) comprising multiple wind farms. Impedance model (IM) analysis has become an important method to study such problems. In this paper, an IM of a D-PMSG grid-connected system (GCS) is established considering the relationship between wind speed and wind turbine output power and the effect of voltage outer loop control. An impedance network model (INM) for a multi-wind-farm grid-connected system (MWFGS) is constructed with IMs of each wind turbine/farm and transmission lines according to the interconnection topology of them. Then, based on the IM of the D-PMSG-GCS, the influence of wind speed on the SSO characteristics is quantitatively analyzed, and the accuracy of the model is verified by comparing with the eigenvalue analysis results. Finally, the influencing factors such as distributed wind speed and network topology of MWFGS on SSO characteristics are quantitatively analyzed based on the INM, and the time-domain simulation verifications are performed in PSCAD/EMTDC. The results prove the effectiveness of INM in analyzing SSO problems of a large-scale WPGS. This is of great significance for the planning of large-scale D-PMSG-based WPGSs and the suppression of SSO.
Highlights
As a green renewable energy resource, wind power has played an important role in solving the current global energy crisis and environmental pollution problems [1]
The influencing factors such as distributed wind speed and network topology of multi-wind-farm grid-connected system (MWFGS) on synchronous oscillation (SSO) characteristics are quantitatively analyzed based on the impedance network model (INM), and the time-domain simulation verifications are performed in PSCAD/EMTDC
In this paper, an Impedance model (IM) of a drive permanent magnet synchronous generator (D-PMSG)-grid-connected system (GCS) is firstly proposed considering the functional relationship between wind speed and wind turbine output power, and the effects of voltage outer loop, current inner loop, phase-locked loop, DC dynamic link, filtering, etc
Summary
As a green renewable energy resource, wind power has played an important role in solving the current global energy crisis and environmental pollution problems [1]. There is no literature to quantify the impact of wind speed on the SSO characteristics of D-PMSG based WPGS with impedance model analysis method. An IM of a D-PMSG-GCS is first established considering the effects of voltage outer loop, current inner loop, phase-locked loop, DC dynamic link and filtering, and wind speed is introduced into the model utilizing the function. Besides the considerations of the voltage outer loop, the current inner loop, the phase-locked loop and etc., the model takes a wind speed variable into account by using the functional relationship between wind speed and output power of WT, to accurately quantify the influences of wind speed on the SSO frequency and damping of the system.
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