Power supply control method for wind generator system

Abstract

The invention relates to a power supply control method for a wind generator system. The wind generator system comprises a wind turbine. The power supply control method comprises the steps of 1) detecting a first current Io and a first voltage Vo of the supply terminal of the wind generator system; 2) detecting a second current Ii output by the wind turbine of the wind generator system; 3) establishing an equivalence model of a power supply line, and calculating a first phase angle theta<o> between the first voltage Vo and the first current Io, and a first frequency of the power supply end; 4)calculating the phase difference between the first phase and the preset phase and the difference between the first frequency and the preset frequency, and adjusting the output voltage and phase angleof the wind turbine of the wind generator system based on the phase difference and the frequency difference. The invention is advantageous in that the output voltage and phase of the wind turbine canbe adjusted through rapidly adjusting fan blades of the wind turbine, and thereby the wind turbine can meet the demand of stable power supply of power grid, and electric energy quality of grid-connected power supply of the wind generator system can be improved.

Description

technical field [0001] The application belongs to the technical field of new energy power supply, and in particular relates to a method for controlling power supply of a wind power generation system. Background technique [0002] In the prior art, there are a lot of harmonics in the wind power supply, and it is difficult to stably supply grid-connected power to the grid. As a result, although the wind generator uses wind energy to generate electricity, it cannot be transmitted well. In some existing technologies, in order to be able to stably To transmit the electric energy generated by the wind power generation system to the grid, it is necessary to convert the electric energy generated by the wind power generation system multiple times to form a stable direct current, store it in the battery, and then transmit the electric energy from the battery when the grid or load needs it Going out, this will cause multiple conversions of electric energy, and the energy is easily lost...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, there are a lot of harmonics in the wind power supply, and it is difficult to stably supply grid-connected power to the grid. As a result, although the wind generator uses wind energy to generate electricity, it cannot be transmitted well. In some existing technologies, in order to be able to stably To transmit the electric energy generated by the wind power generation system to the grid, it is necessary to convert the electric energy generated by the wind power generation system multiple times to form a stable direct current, store it in the battery, and then transmit the electric energy from the battery when the grid or load needs it Going out, this will cause multiple transformations of electric energy, and the energy is easily lost. At the same time, a large number of batteries need to be used, resulting in increased power supply costs

[0003] In the existing technology, due to its intermittent nature, the wind power generation system cannot be directly connected to the grid because it cannot quickly track the phase, frequency, and there are a large number of harmonics, which will cause pollution to the grid. There is an urgent need for a fast and direct grid connection. The wind power system of the network can directly control the wind turbine by quickly tracking the phase and frequency to achieve fast power supply

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