Stability analysis and parameter optimization of SVG in renewable energy collection stations based frequency-domain admittance matrix

Equipping a renewable energy collection station with Static Var Generator (SVG) contributes to the enhancement of the power quality, and system stability. To efficiently achieve the analysis of grid-connected stability and multi-parameter optimization of SVGs in renewable energy collection stations, the impedance models of SVG, considering various control modes, are first established. By using the frequency-domain admittance matrix to describe the whole system consisting of renewable power generation units, collecting network, SVGs and equivalent unity grid, the stability analysis is performed for typical operating conditions of the renewable energy collection station. Furthermore, damping ratio and its sensitivity calculation algorithm based on the frequency-domain admittance matrix is designed, and a multi-parameter coordinated tuning model for stability optimization using the damping ratio sensitivity is developed. Finally, the derived impedance model and the proposed method are validated through theoretical analysis using the frequency-domain admittance matrix and time-domain simulations in MATLAB/Simulink.