Method for cooperatively controlling reactive voltage of wind farm

Abstract

The invention relates to a method for cooperatively controlling reactive voltage of a wind farm. In the method, a reference voltage value of a busbar is calculated through a logic link according to measured active power, reactive power and a given reference value of reactive power, and the reactive power of each wind turbine is regulated in real-time based on the reference voltage value. The method can cooperatively control reactive output of each wind turbine to enable reactive output of a grid-connection point of a wind farm to meet the variation of system loads so as to restrain the fluctuation of busbar voltage caused by the variation of surrounding loads as well as resist voltage fall of a control point caused by faults of a local electric network, thereby maintaining stable voltage of the wind farm accessing a regional power grid.

Description

technical field [0001] The invention relates to a coordinated control method for wind farm reactive voltage, and belongs to the technical field of wind farm grid-connected control. Background technique [0002] The strategy of sustainable social development requires increasing the utilization of renewable clean energy power generation. As one of the most mature renewable energy power generation methods, wind power will definitely be vigorously developed. For this reason, the impact of wind power access on the power system, the characteristics of wind turbine grid-connected operation, and the control methods of wind turbines in different operating modes of the system have attracted more and more attention. The rapid development of wind power has brought many new problems to the power system, among which the problem of reactive power and voltage is one of the most prominent and most concerned problems. [0003] Early grid-connected wind farms mainly use constant-speed asynchr...

AI Technical Summary

Problems solved by technology

[0005] First, the WindVAR system uses the wind turbine as the control unit, lacks unified planning for the reactive power of the entire wind farm, and the wind turbine autonomous control

Once the output reactive power of some wind turbines in the wind farm reaches the limit, each wind turbine is relatively autonomous and lacks mutual coordination, resulting in insufficient or excess reactive power compensation for the entire field;

[0006] Second, the wind turbine control under the control of the WindVAR system is too frequent

Taking the adjusted voltage as the basis for unit adjustment will cause large fluctuations in the adjustment amount of the unit due to the small threshold value. The use of real-time data ignores the impact of the change process on the adjustment, and point-to-point adjustment will deteriorate the stability of the power grid operation.

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