Assessment of Frequency Stability Enhancement in Dominated Wind Power Plants Grid

With the fast proliferation of intermittent renewable energy sources and fluctuations in load demand, power systems need to withstand an increasing number of disturbances that may affect the system frequency. In this paper, the highest acceptable penetration level of wind generation is formulated and calculated with and without considering operating reserve constraints as a function of equivalent governor response and system inertia. Afterward, the feasibility of wind turbine participation in the power system frequency regulation task is investigated and the minimum required wind turbine frequency response is calculated as a function of penetration level. This study uses a discretized model of dynamic system frequency response to estimate the minimum frequency after contingencies. To investigate the proposed methods, some sensitivity analyses are carried out on IEEE 39-bus test system. Simulations results illustrate a more secure and reliable operation of the power system when the wind turbines participate in the frequency regulation task.