A control method for active energy consumption operation of doubly-fed wind turbines

Abstract

The invention discloses a control method for active energy consumption operation of a doubly-fed wind-driven generator unit. The method comprises steps of obtaining the parameters of the doubly-fed wind-driven generator unit and the operating parameters prior to a fault; when the AC grid has a fault and generates an active power surplus, adjusting and controlling the doubly-fed wind-driven generator unit, switching the doubly-fed wind-driven generator unit in sub-synchronous operation from a power generation state to an electrically driven state to consume the surplus active power of the AC grid to achieve the balance of the active power of the AC grid. The method can quickly switch the doubly-fed wind-driven generator unit from the power generation state to the electrically driven state when the AC grid has an active power surplus, thereby achieving a rapid balance of the surplus active power of the grid. The method is fast in control response, stable in power absorption, easy to implement, and low in cost, can reduce thermal power generator tripping quantity, and contributes to improvement in the system power angle stability and frequency stability.

Description

technical field [0001] The invention relates to the field of power system protection and control, in particular to a control method for active energy consumption operation of a doubly-fed wind turbine. Background technique [0002] With the access of new energy and DC transmission systems, the traditional power grid has undergone tremendous changes. As the coupling between the source and the grid and between the AC and DC gradually increases, the unbalanced active power caused by the grid fault becomes stronger with the development and spread of the fault, and the scope of the fault also expands. [0003] The existing active power emergency control measures mainly include cut-off control, electrical braking and quick valve control. Among them, although electrical braking has a direct effect in reducing power unbalance, it has limitations in terms of thermal stability and safe space; fast valve control is affected by the parameters of the unit, and its adjustment ability is ...

AI Technical Summary

Problems solved by technology

However, the rotor inertia of the doubly-fed wind turbine is small, the energy that can be absorbed under the safety limit of the speed is limited, and the adjustable power is not enough to stabilize the large active power surplus caused by the interruption of the transmission channel.

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