Abstract: In view of the problem of frequency stability of the high proportion wind power at the DC transmission ends in Northeast China Power Grid, the large-disturbance test of wind farm inertia response and primary frequency regulation capability is organized by the Northeast Branch of State Grid, and the engineering application of wind power virtual inertia is realized for the first time. Based on the test data, the frequency dynamic characteristics of Northeast China Power Grid are analyzed, the equivalent inertia level and the frequency extreme characteristic coefficient of Northeast China Power Grid are calculated, and the ability of system frequency to resist the disturbances is quantified. The inertia response and primary frequency regulation implementation scheme of the grid source coordinated demonstration wind farms is introduced. The inertia response characteristics of wind turbines in different implementation schemes are compared and analyzed, and the primary frequency regulation parameter indexes of different demonstration wind farms are obtained. The test proves the feasibility and effectiveness of the virtual inertia and primary frequency regulation of the wind power, which has the guiding and reference significance for the engineering application of large-scale wind power participating in system inertia support and primary frequency regulation.