Windenergiespeicher gemeinsame Frequenzmodulation

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What is the frequency modulation depth of improved wind farms?

The frequency modulation depth of the improved wind farms was shown in Fig. 9 after the post fault. Combined with Table 5, it can be concluded that the frequency modulation depth of the wind farm is more than 10% of the fault capacity. The speed recovery process of the wind farm is shown in Fig. 10.

How a DC auxiliary frequency controller works in a wind farm?

The reasonable control of the speed deviation and the delay switching function provide the possibility for the rapid recovery of the wind farm speed. While the wind farm participates in frequency regulation, the DC auxiliary frequency controller will reduce the output active power of the rectifier side.

Which wind turbines can participate in system frequency regulation?

All the wind turbines in IEEE39 bus system could participate in system frequency regulation. The proportion of wind turbines exceeds 40% of the total capacity. The DFIG is set at nodes of 32, 35, 36, 37 and 38. Thermal power units are set at nodes of 13, 30, 31, 33, 34 and 39. The HVDC is set at nodes of 21. The slack node is set at the bus of 21.

How can a wind farm improve frequency stability & equivalent inertia?

The frequency stability and equivalent inertia of the system are improved. When the speed deviation of the wind farm is controlled within 0.02p.u., the wind farm can provide an additional 20% of its own capacity to participate in frequency regulation, and at the same time quickly restore the rotor speed.

How does virtual inertia control affect the frequency stability of a wind turbine?

The wind turbine with additional virtual inertia control supported the frequency stability of the system at the expense of its own kinetic energy. After the frequency recovery, the high proportion wind turbines start the speed recovery process at the same time, which led to the aggravation of the secondary frequency drop.

Which bus system has a high proportion of wind turbines?

The IEEE39 bus system with high proportion of wind turbines was established. The weight coefficient is proposed to characterize the frequency modulation participation of wind farms under different short-circuit capacity.