Wind farm group impedance analysis method, reactive power control method and device, and power generation system

Abstract

The invention discloses a wind power plant group impedance analysis method, a reactive power control method and device and a power generation system. A wind power plant group comprises a plurality ofwind power generator sets, wherein the plurality of wind power generator sets are connected to form a plurality of target control points, and each target control point comprises a grid-connected pointand a branch point of the wind power plant group. The wind power plant group impedance analysis method comprises the steps of building a simulation model of the wind power plant group according to awind field structure and a wind field parameter of the wind power plant group; determining a current working condition of the target control point according to a current voltage, a current active power and a current reactive power of each target control point of the wind power plant group; determining system impedance of the target control point and power flow distribution of the wind power plantfield under the current working condition according to the simulation model; and correcting system impedance according to a perturbation method and the power flow distribution. According to the wind power plant group impedance analysis method disclosed by the embodiment of the invention, the measurement error of system impedance can be reduced, and the flexibility of each wind power generator setcontrol and the safety and the stability of a power grid can be improved during reactive power control on the wind power plant group.

Description

technical field [0001] The invention belongs to the technical field of wind power, and in particular relates to a wind farm group impedance analysis method and a reactive power control method and device and a power generation system. Background technique [0002] In order to meet the increasing demand for power resources, the scale of wind farms needs to be increased. When the scale of the wind farm increases, not only the centralized access of large-scale wind turbines to the power system will have a great impact on the security and stability of the power grid, but also the fluctuation of the voltage at the grid connection point of the wind farm caused by the reactive power fluctuation will also directly affect The security and stability of the power grid. Specifically, as the scale of the wind farm increases, especially the capacity of the wind farm group increases, the output of the wind turbine will have a certain spatial coupling characteristic, so that the fluctuation...

AI Technical Summary

Problems solved by technology

When controlling each wind turbine itself, free control of the wind turbines in the wind farm will cause internal friction of the reactive power of the wind farm group, and the goal of giving priority to wind power generation efficiency cannot be achieved

When performing centralized reactive power compensation for wind farms, due to the disadvantages of high cost, large loss and poor stability of wind farm centralized reactive power compensation equipment, as well as the poor coordination between centralized reactive power compensation equipment and wind turbines, it cannot be done very well. Good realization of reactive power control

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