Probabilistic Voltage Stability Analysis Considering Variable Wind Generation and Different Control Modes

With the increased wind power penetration in the power grid, it is increasingly influencing the power system planning, operation and system stability studies. This paper presents probabilistic voltage stability analysis as affected by the variable wind generation and different control modes. Probabilistic voltage stability studies are performed considering a wide range of wind generation modeling scenarios in the power network, such as (i) different levels of wind speed, (ii) different types of wind generators, (iii) various control modes, (iv) voltage control mode with different set voltage magnitudes, and (v) voltage-Q droop control mode with different droop percentages. The IEEE 39 bus network is utilized in DIgSILENT PowerFactory to perform the probabilistic voltage stability analysis by running 2000 Monte Carlo Simulations. The P-V curves and Q-V curves are employed as the measure of voltage stability assessment. The obtained results show that voltage stability is highly impacted by the different levels of wind speed uncertainties, and further, the voltage stability margin is increased with a high wind speed mean. Also, the voltage stability can be improved by operating with voltage-Q droop control mode, increasing the set voltage magnitudes of voltage control, and reducing the droop percentage of the voltage-Q droop control.