Method and system for controlling wind turbine generator unit to operate in limited power mode

Abstract

The invention belongs to the field of power control of a wind power plant, in particular to a method and a system for controlling a wind turbine generator unit to operate in a limited power mode. The method comprises the following steps: according to a pitch angle beta of each draught fan of the wind turbine generator unit in the current stable operating process, the wind turbine generator unit is divided into a plurality of draught fan groups; when the wind turbine generator unit operates in a limited power mode, the power of one or the plurality of draught fan groups is adjusted from large to small according to the total variable power of each draught fan group, and the total power of the wind turbine generator unit is not larger than a total target power. According to the method for controlling the wind turbine generator unit to operate in a limited power mode, the operation conditions of the wind turbine generator unit are classified according to the pitch angle of the draught fans in the current stable operating process, then the power controllable variation amount of each draught fan at the current wind speed is evaluated, different groups are dispatched according to the needs, and the optimal dispatching of the draught fans is achieved.

Description

technical field [0001] The invention belongs to the field of power control of wind farms, and in particular relates to a method and system for controlling the power-limited operation of wind turbines. Background technique [0002] With the rapid development of domestic wind power, the construction scale of wind farms continues to expand and their distribution is relatively concentrated. It is difficult for the power grid to transmit and absorb such large-scale wind power. target value, otherwise a penalty will be imposed. The field-level control system of the wind farm distributes the target power to each wind turbine in the field for execution. Each wind turbine must track its own target power as much as possible, so that it is possible to avoid violations of regulations and to achieve as much as possible under the condition of limit. generate electricity. [0003] Traditional wind turbines generally operate according to their wind speed-power curve, and pitch control is ...

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Problems solved by technology

[0006] The embodiment of the present invention provides a method and system for controlling the power-limited operation of wind turbines, which is used to solve the problem that in the prior art, when the power-limited operation is regulated, all fans in the field participate in power regulation, and long-term operation aggravates the pitch actuator of the unit. the degree of wear and tear

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