Power collection and transmission system for wind power plant and voltage control method for alternating current generatrix of power collection and transmission system

Abstract

The invention discloses a power collection and transmission system for a wind power plant. The system comprises an alternating current generatrix, a wind generating set, a rectifier station and an inverter station, wherein the rectifier station comprises a rectifier and a converter transformer; the direct current side of the rectifier is connected with the direct current side of the inverter station, and the alternating current side of the rectifier is connected with one side of the converter transformer through a converter inductor; and the other side of the converter transformer is connected with the alternating current generatrix, and is grounded through a capacitor. The invention also discloses a voltage control method for the alternating current generatrix of the system. The voltage comprising the amplitude and frequency of the voltage of the alternating current generatrix of the system is integrally controlled by two control dimensions of the rectifier on a wind power plant side, so that the stability of the alternating current voltage of the power collection and transmission system of the wind power plant is ensured, and harmonic components of an alternating current system of the wind power plant are reduced.

Description

technical field [0001] The invention belongs to the technical field of power system transmission and distribution, and in particular relates to a power collection and transmission system of a wind farm and an AC bus voltage control method thereof. Background technique [0002] With energy shortages and environmental changes, wind energy has received great attention. It is necessary to use science and technology to develop and utilize wind energy. Wind power is one of the good ways. The instability and uncertainty of wind energy, in order to ensure the safe and stable operation of the national grid, the safe and stable grid connection of wind farms has always been a technical bottleneck and problem restricting the development of wind power. question. [0003] At present, there are mainly the following methods for wind farm grid connection at home and abroad: (1) The wind farm power collection system is directly connected to the grid through AC lines (cables or overhead lines...

AI Technical Summary

Problems solved by technology

Although this method can control the AC voltage amplitude of the wind farm collector system to a certain extent, it cannot control the frequency of the AC voltage because it only uses one dimension of the wind farm rectifier to control the AC voltage.

The AC voltage of the wind farm collector system is closely related to the safe and stable operation of the entire wind farm. The instability of the AC voltage frequency of the collector system will be transmitted in the AC line inside the wind farm, increasing the harmonic components of the AC system, and the harmonic components will be further transmitted to the wind farm. Inside the wind turbine, the internal winding of the wind motor generates heat, which affects the service life of electrical components and causes great damage to the wind motor. In addition, harmonics will also bring more losses, reduce the output energy efficiency of the wind farm, and also affect the wind farm. stable operation of

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