Approximate modal computation of power systems integrated with the PMSG for wind power generation

Integration of large number of wind farms into a power system will significantly increase the dimension of dynamic model of the system. This will bring about numerical complexity and difficulty to the computation of system electromechanical oscillation modes. This paper proposes a method for the computation of electromechanical oscillation modes of the power system integrated with the wind generators. By using the method, the oscillation mode can be computed without performing the eigensolution of increased high-dimension state matrix due to the integration of wind farms into the power system. The dimension of state matrix involved in the eigensolution in the proposed method remains unchanged and thus numerical complexity and difficulty due to the increase of dimension of dynamic model of the power system integrated with the wind farms is successfully avoided. In the paper, the permanent magnetic synchronous generators (PMSG) for wind power generation are used as the representative of wind generators for the presentation and demonstration of the proposed method. An example of large-scale power system integrated with the wind farms with the PMSGs is presented in the paper.