Power coordination control method based on direct-drive wind-turbine-generator wind farm

Abstract

The invention discloses a power coordination control method based on a direct-drive wind-turbine-generator wind farm. The power coordination control method is characterized in that the voltage of the wind farm is detected to judge whether the condition of starting a wind farm power coordination control mode is met; when the condition is not met, wind turbine generators in the wind farm adopt normal control modes, and when the condition is met, the wind farm is in the power coordination control mode; and the active and reactive control amounts of the wind farm are figured out in the power coordination control mode and then are distributed to single wind turbine generators in the wind farm to serve as control signals to adjust the output of the power of the single wind turbine generators, and further, the closed-loop control on bus bar voltage of the wind farm is realized. The capacity of adjusting the reactive power of the wind farm is improved to maintain the voltage level at an outlet of the wind farm, thereby preventing or avoiding higher impact on a power grid, and guaranteeing the continuous and stable operation of the wind farm; and the power coordination control method can perform reasonable coordination control on the active and reactive power generation of the wind farm and effectively provide reactive power support for the voltage at the outlet of the wind farm, so that the voltage stability at an access point is maintained.

Description

Technical field: [0001] The invention relates to a power coordination control method for a wind farm based on a direct-drive wind turbine, and belongs to the technical field of wind power generation. Background technique: [0002] The large-scale connection of wind farms has brought many new problems to the power system, among which the problem of reactive power and voltage is one of the most concerned problems. At present, installing reactive power compensation devices in wind farms is the most common method to solve the voltage stability problem caused by wind farm grid connection. However, these devices are expensive, resulting in increased investment in wind farms. With the development of wind power generation technology, variable-speed constant-frequency wind turbines have become the mainstream models of grid-connected wind farms. This type of wind turbines includes double-fed wind turbines and direct-drive wind turbines. Some or all of their power is sent to the grid ...

AI Technical Summary

Problems solved by technology

If the low-voltage ride-through mode is entered again within a few minutes, due to the high temperature of the unloading device, it may cause consequences such as shutdown

Due to wind speed changes, load fluctuations, and large voltage fluctuations after the end of special operation modes such as low-voltage ride-through may cause more serious consequences, such as entering the low-voltage ride-through mode for the first time or again.

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