苏晨博,刘崇茹.基于阻抗法的大规模风电场等值方法研究[J].电测与仪表,2022,59(6):90-97. Suchenbo,Liuchongru.An Impedance-based Equivalent Method for Wind Farms with PMSGs to Evaluate Power System Oscillation Stability[J].Electrical Measurement & Instrumentation,2022,59(6):90-97.
基于阻抗法的大规模风电场等值方法研究
An Impedance-based Equivalent Method for Wind Farms with PMSGs to Evaluate Power System Oscillation Stability
The integration of large-scale wind farms incurs new oscillation stability issues in the power systems. To guarantee the computation efficiency, the wind farm is always replaced with a single unit for the oscillation stability analysis in most literature. However, it ignores the dynamic interaction inside the wind farm and may lead to unreliable results. This paper decomposes a wind farm with M coupled permanent magnet synchronous generators (PMSGs) into a diagonal matrix with M blocks representing equivalent PMSG subsystems through the eigenvalue decomposition technique. On this basis, an impedance-based reduced-order model for the wind farm is derived by the matrix perturbation theory, which can characterize the dynamic interaction inside the wind farm. Intuitively, a wind farm is represented by several equivalent PMSGs paralleled with controlled current sources in the proposed model. The proposed equivalent method can significantly reduce the computation burden and guarantee its accuracy, suitable for real-time oscillation stability analysis simulation. In addition, the numerical simulations and hardware-in-loop experiments show that the proposed method can precisely evaluate the oscillation stability margin of the power system integrated with wind farms.
